pval.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2006, Digium, Inc.
 *
 * Steve Murphy <murf@parsetree.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Compile symbolic Asterisk Extension Logic into Asterisk extensions, version 2.
 * 
 */

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 358810 $")

#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <regex.h>
#include <sys/stat.h>

#include "asterisk/pbx.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/logger.h"
#include "asterisk/cli.h"
#include "asterisk/app.h"
#include "asterisk/channel.h"
#include "asterisk/callerid.h"
#include "asterisk/pval.h"
#include "asterisk/ael_structs.h"
#ifdef AAL_ARGCHECK
#include "asterisk/argdesc.h"
#endif
#include "asterisk/utils.h"

extern struct ast_flags ast_compat;
extern int localized_pbx_load_module(void);

static char expr_output[2096];
#define AST_PBX_MAX_STACK  128
#define BUF_SIZE 2000

/* these functions are in ../ast_expr2.fl */

static int errs, warns;
static int notes;
#ifdef STANDALONE
static int extensions_dot_conf_loaded = 0;
#endif
static char *registrar = "pbx_ael";

static pval *current_db;
static pval *current_context;
static pval *current_extension;

static const char *match_context;
static const char *match_exten;
static const char *match_label;
static int in_abstract_context;
static int count_labels; /* true, put matcher in label counting mode */
static int label_count;  /* labels are only meant to be counted in a context or exten */
static int return_on_context_match;
static pval *last_matched_label;
struct pval *match_pval(pval *item);
static void check_timerange(pval *p);
static void check_dow(pval *DOW);
static void check_day(pval *DAY);
static void check_month(pval *MON);
static void check_expr2_input(pval *expr, char *str);
static int extension_matches(pval *here, const char *exten, const char *pattern);
static void check_goto(pval *item);
static void find_pval_goto_item(pval *item, int lev);
static void find_pval_gotos(pval *item, int lev);
static int check_break(pval *item);
static int check_continue(pval *item);
static void check_label(pval *item);
static void check_macro_returns(pval *macro);

static struct pval *find_label_in_current_context(char *exten, char *label, pval *curr_cont);
static struct pval *find_first_label_in_current_context(char *label, pval *curr_cont);
static void print_pval_list(FILE *fin, pval *item, int depth);

static struct pval *find_label_in_current_extension(const char *label, pval *curr_ext);
static struct pval *find_label_in_current_db(const char *context, const char *exten, const char *label);
static pval *get_goto_target(pval *item);
static int label_inside_case(pval *label);
static void attach_exten(struct ael_extension **list, struct ael_extension *newmem);
static void fix_gotos_in_extensions(struct ael_extension *exten);
static pval *get_extension_or_contxt(pval *p);
static pval *get_contxt(pval *p);
static void remove_spaces_before_equals(char *str);

/* PRETTY PRINTER FOR AEL:  ============================================================================= */

static void print_pval(FILE *fin, pval *item, int depth)
{
   int i;
   pval *lp;
   
   for (i=0; i<depth; i++) {
      fprintf(fin, "\t"); /* depth == indentation */
   }
   
   switch ( item->type ) {
   case PV_WORD:
      fprintf(fin,"%s;\n", item->u1.str); /* usually, words are encapsulated in something else */
      break;
      
   case PV_MACRO:
      fprintf(fin,"macro %s(", item->u1.str);
      for (lp=item->u2.arglist; lp; lp=lp->next) {
         if (lp != item->u2.arglist )
            fprintf(fin,", ");
         fprintf(fin,"%s", lp->u1.str);
      }
      fprintf(fin,") {\n");
      print_pval_list(fin,item->u3.macro_statements,depth+1);
      for (i=0; i<depth; i++) {
         fprintf(fin,"\t"); /* depth == indentation */
      }
      fprintf(fin,"};\n\n");
      break;
         
   case PV_CONTEXT:
      if ( item->u3.abstract )
         fprintf(fin,"abstract context %s {\n", item->u1.str);
      else
         fprintf(fin,"context %s {\n", item->u1.str);
      print_pval_list(fin,item->u2.statements,depth+1);
      for (i=0; i<depth; i++) {
         fprintf(fin,"\t"); /* depth == indentation */
      }
      fprintf(fin,"};\n\n");
      break;
         
   case PV_MACRO_CALL:
      fprintf(fin,"&%s(", item->u1.str);
      for (lp=item->u2.arglist; lp; lp=lp->next) {
         if ( lp != item->u2.arglist )
            fprintf(fin,", ");
         fprintf(fin,"%s", lp->u1.str);
      }
      fprintf(fin,");\n");
      break;
         
   case PV_APPLICATION_CALL:
      fprintf(fin,"%s(", item->u1.str);
      for (lp=item->u2.arglist; lp; lp=lp->next) {
         if ( lp != item->u2.arglist )
            fprintf(fin,",");
         fprintf(fin,"%s", lp->u1.str);
      }
      fprintf(fin,");\n");
      break;
         
   case PV_CASE:
      fprintf(fin,"case %s:\n", item->u1.str);
      print_pval_list(fin,item->u2.statements, depth+1);
      break;
         
   case PV_PATTERN:
      fprintf(fin,"pattern %s:\n", item->u1.str);
      print_pval_list(fin,item->u2.statements, depth+1);
      break;
         
   case PV_DEFAULT:
      fprintf(fin,"default:\n");
      print_pval_list(fin,item->u2.statements, depth+1);
      break;
         
   case PV_CATCH:
      fprintf(fin,"catch %s {\n", item->u1.str);
      print_pval_list(fin,item->u2.statements, depth+1);
      for (i=0; i<depth; i++) {
         fprintf(fin,"\t"); /* depth == indentation */
      }
      fprintf(fin,"};\n");
      break;
         
   case PV_SWITCHES:
      fprintf(fin,"switches {\n");
      print_pval_list(fin,item->u1.list,depth+1);
      for (i=0; i<depth; i++) {
         fprintf(fin,"\t"); /* depth == indentation */
      }
      fprintf(fin,"};\n");
      break;
         
   case PV_ESWITCHES:
      fprintf(fin,"eswitches {\n");
      print_pval_list(fin,item->u1.list,depth+1);
      for (i=0; i<depth; i++) {
         fprintf(fin,"\t"); /* depth == indentation */
      }
      fprintf(fin,"};\n");
      break;
         
   case PV_INCLUDES:
      fprintf(fin,"includes {\n");
      for (lp=item->u1.list; lp; lp=lp->next) {
         for (i=0; i<depth+1; i++) {
            fprintf(fin,"\t"); /* depth == indentation */
         }
         fprintf(fin,"%s", lp->u1.str); /* usually, words are encapsulated in something else */
         if (lp->u2.arglist)
            fprintf(fin,"|%s|%s|%s|%s", 
                  lp->u2.arglist->u1.str,
                  lp->u2.arglist->next->u1.str,
                  lp->u2.arglist->next->next->u1.str,
                  lp->u2.arglist->next->next->next->u1.str
               );
         fprintf(fin,";\n"); /* usually, words are encapsulated in something else */
      }
      
      for (i=0; i<depth; i++) {
         fprintf(fin,"\t"); /* depth == indentation */
      }
      fprintf(fin,"};\n");
      break;
         
   case PV_STATEMENTBLOCK:
      fprintf(fin,"{\n");
      print_pval_list(fin,item->u1.list, depth+1);
      for (i=0; i<depth; i++) {
         fprintf(fin,"\t"); /* depth == indentation */
      }
      fprintf(fin,"}\n");
      break;
         
   case PV_VARDEC:
      fprintf(fin,"%s=%s;\n", item->u1.str, item->u2.val);
      break;
         
   case PV_LOCALVARDEC:
      fprintf(fin,"local %s=%s;\n", item->u1.str, item->u2.val);
      break;
         
   case PV_GOTO:
      fprintf(fin,"goto %s", item->u1.list->u1.str);
      if ( item->u1.list->next )
         fprintf(fin,",%s", item->u1.list->next->u1.str);
      if ( item->u1.list->next && item->u1.list->next->next )
         fprintf(fin,",%s", item->u1.list->next->next->u1.str);
      fprintf(fin,"\n");
      break;
         
   case PV_LABEL:
      fprintf(fin,"%s:\n", item->u1.str);
      break;
         
   case PV_FOR:
      fprintf(fin,"for (%s; %s; %s)\n", item->u1.for_init, item->u2.for_test, item->u3.for_inc);
      print_pval_list(fin,item->u4.for_statements,depth+1);
      break;
         
   case PV_WHILE:
      fprintf(fin,"while (%s)\n", item->u1.str);
      print_pval_list(fin,item->u2.statements,depth+1);
      break;
         
   case PV_BREAK:
      fprintf(fin,"break;\n");
      break;
         
   case PV_RETURN:
      fprintf(fin,"return;\n");
      break;
         
   case PV_CONTINUE:
      fprintf(fin,"continue;\n");
      break;
         
   case PV_RANDOM:
   case PV_IFTIME:
   case PV_IF:
      if ( item->type == PV_IFTIME ) {
         
         fprintf(fin,"ifTime ( %s|%s|%s|%s )\n", 
               item->u1.list->u1.str, 
               item->u1.list->next->u1.str, 
               item->u1.list->next->next->u1.str, 
               item->u1.list->next->next->next->u1.str
               );
      } else if ( item->type == PV_RANDOM ) {
         fprintf(fin,"random ( %s )\n", item->u1.str );
      } else
         fprintf(fin,"if ( %s )\n", item->u1.str);
      if ( item->u2.statements && item->u2.statements->next ) {
         for (i=0; i<depth; i++) {
            fprintf(fin,"\t"); /* depth == indentation */
         }
         fprintf(fin,"{\n");
         print_pval_list(fin,item->u2.statements,depth+1);
         for (i=0; i<depth; i++) {
            fprintf(fin,"\t"); /* depth == indentation */
         }
         if ( item->u3.else_statements )
            fprintf(fin,"}\n");
         else
            fprintf(fin,"};\n");
      } else if (item->u2.statements ) {
         print_pval_list(fin,item->u2.statements,depth+1);
      } else {
         if (item->u3.else_statements )
            fprintf(fin, " {} ");
         else
            fprintf(fin, " {}; ");
      }
      if ( item->u3.else_statements ) {
         for (i=0; i<depth; i++) {
            fprintf(fin,"\t"); /* depth == indentation */
         }
         fprintf(fin,"else\n");
         print_pval_list(fin,item->u3.else_statements, depth);
      }
      break;
         
   case PV_SWITCH:
      fprintf(fin,"switch( %s ) {\n", item->u1.str);
      print_pval_list(fin,item->u2.statements,depth+1);
      for (i=0; i<depth; i++) {
         fprintf(fin,"\t"); /* depth == indentation */
      }
      fprintf(fin,"}\n");
      break;
         
   case PV_EXTENSION:
      if ( item->u4.regexten )
         fprintf(fin, "regexten ");
      if ( item->u3.hints )
         fprintf(fin,"hints(%s) ", item->u3.hints);
      
      fprintf(fin,"%s => ", item->u1.str);
      print_pval_list(fin,item->u2.statements,depth+1);
      fprintf(fin,"\n");
      break;
         
   case PV_IGNOREPAT:
      fprintf(fin,"ignorepat => %s;\n", item->u1.str);
      break;
         
   case PV_GLOBALS:
      fprintf(fin,"globals {\n");
      print_pval_list(fin,item->u1.statements,depth+1);
      for (i=0; i<depth; i++) {
         fprintf(fin,"\t"); /* depth == indentation */
      }
      fprintf(fin,"}\n");
      break;
   }
}

static void print_pval_list(FILE *fin, pval *item, int depth)
{
   pval *i;
   
   for (i=item; i; i=i->next) {
      print_pval(fin, i, depth);
   }
}

void ael2_print(char *fname, pval *tree)
{
   FILE *fin = fopen(fname,"w");
   if ( !fin ) {
      ast_log(LOG_ERROR, "Couldn't open %s for writing.\n", fname);
      return;
   }
   print_pval_list(fin, tree, 0);
   fclose(fin);
}


/* EMPTY TEMPLATE FUNCS FOR AEL TRAVERSAL:  ============================================================================= */

void traverse_pval_template(pval *item, int depth);
void traverse_pval_item_template(pval *item, int depth);


void traverse_pval_item_template(pval *item, int depth)/* depth comes in handy for a pretty print (indentation),
                                            but you may not need it */
{
   pval *lp;
   
   switch ( item->type ) {
   case PV_WORD:
      /* fields: item->u1.str == string associated with this (word). */
      break;
      
   case PV_MACRO:
      /* fields: item->u1.str     == name of macro
                 item->u2.arglist == pval list of PV_WORD arguments of macro, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg

               item->u3.macro_statements == pval list of statements in macro body.
      */
      for (lp=item->u2.arglist; lp; lp=lp->next) {
      
      }
      traverse_pval_item_template(item->u3.macro_statements,depth+1);
      break;
         
   case PV_CONTEXT:
      /* fields: item->u1.str     == name of context
                 item->u2.statements == pval list of statements in context body
               item->u3.abstract == int 1 if an abstract keyword were present
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      break;
         
   case PV_MACRO_CALL:
      /* fields: item->u1.str     == name of macro to call
                 item->u2.arglist == pval list of PV_WORD arguments of macro call, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg
      */
      for (lp=item->u2.arglist; lp; lp=lp->next) {
      }
      break;
         
   case PV_APPLICATION_CALL:
      /* fields: item->u1.str     == name of application to call
                 item->u2.arglist == pval list of PV_WORD arguments of macro call, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg
      */
      for (lp=item->u2.arglist; lp; lp=lp->next) {
      }
      break;
         
   case PV_CASE:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      break;
         
   case PV_PATTERN:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      break;
         
   case PV_DEFAULT:
      /* fields: 
                 item->u2.statements == pval list of statements under the case
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      break;
         
   case PV_CATCH:
      /* fields: item->u1.str     == name of extension to catch
                 item->u2.statements == pval list of statements in context body
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      break;
         
   case PV_SWITCHES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      traverse_pval_item_template(item->u1.list,depth+1);
      break;
         
   case PV_ESWITCHES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      traverse_pval_item_template(item->u1.list,depth+1);
      break;
         
   case PV_INCLUDES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
                 item->u2.arglist  == pval list of 4 PV_WORD elements for time values
      */
      traverse_pval_item_template(item->u1.list,depth+1);
      traverse_pval_item_template(item->u2.arglist,depth+1);
      break;
         
   case PV_STATEMENTBLOCK:
      /* fields: item->u1.list     == pval list of statements in block, one per entry in the list
      */
      traverse_pval_item_template(item->u1.list,depth+1);
      break;
         
   case PV_LOCALVARDEC:
   case PV_VARDEC:
      /* fields: item->u1.str     == variable name
                 item->u2.val     == variable value to assign
      */
      break;
         
   case PV_GOTO:
      /* fields: item->u1.list     == pval list of PV_WORD target names, up to 3, in order as given by user.
                 item->u1.list->u1.str  == where the data on a PV_WORD will always be.
      */
      
      if ( item->u1.list->next )
         ;
      if ( item->u1.list->next && item->u1.list->next->next )
         ;
      
      break;
         
   case PV_LABEL:
      /* fields: item->u1.str     == label name
      */
      break;
         
   case PV_FOR:
      /* fields: item->u1.for_init     == a string containing the initalizer
                 item->u2.for_test     == a string containing the loop test
                 item->u3.for_inc      == a string containing the loop increment

               item->u4.for_statements == a pval list of statements in the for ()
      */
      traverse_pval_item_template(item->u4.for_statements,depth+1);
      break;
         
   case PV_WHILE:
      /* fields: item->u1.str        == the while conditional, as supplied by user

               item->u2.statements == a pval list of statements in the while ()
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      break;
         
   case PV_BREAK:
      /* fields: none
      */
      break;
         
   case PV_RETURN:
      /* fields: none
      */
      break;
         
   case PV_CONTINUE:
      /* fields: none
      */
      break;
         
   case PV_IFTIME:
      /* fields: item->u1.list        == there are 4 linked PV_WORDs here.

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      if ( item->u3.else_statements ) {
         traverse_pval_item_template(item->u3.else_statements,depth+1);
      }
      break;
         
   case PV_RANDOM:
      /* fields: item->u1.str        == the random number expression, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      if ( item->u3.else_statements ) {
         traverse_pval_item_template(item->u3.else_statements,depth+1);
      }
      break;
         
   case PV_IF:
      /* fields: item->u1.str        == the if conditional, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      if ( item->u3.else_statements ) {
         traverse_pval_item_template(item->u3.else_statements,depth+1);
      }
      break;
         
   case PV_SWITCH:
      /* fields: item->u1.str        == the switch expression

               item->u2.statements == a pval list of statements in the switch, 
                                    (will be case statements, most likely!)
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      break;
         
   case PV_EXTENSION:
      /* fields: item->u1.str        == the extension name, label, whatever it's called

               item->u2.statements == a pval list of statements in the extension
               item->u3.hints      == a char * hint argument
               item->u4.regexten   == an int boolean. non-zero says that regexten was specified
      */
      traverse_pval_item_template(item->u2.statements,depth+1);
      break;
         
   case PV_IGNOREPAT:
      /* fields: item->u1.str        == the ignorepat data
      */
      break;
         
   case PV_GLOBALS:
      /* fields: item->u1.statements     == pval list of statements, usually vardecs
      */
      traverse_pval_item_template(item->u1.statements,depth+1);
      break;
   }
}

void traverse_pval_template(pval *item, int depth) /* depth comes in handy for a pretty print (indentation),
                                         but you may not need it */
{
   pval *i;
   
   for (i=item; i; i=i->next) {
      traverse_pval_item_template(i, depth);
   }
}


/* SEMANTIC CHECKING FOR AEL:  ============================================================================= */

/*   (not all that is syntactically legal is good! */


static void check_macro_returns(pval *macro)
{
   pval *i;
   if (!macro->u3.macro_statements)
   {
      pval *z = calloc(1, sizeof(struct pval));
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The macro %s is empty! I will insert a return.\n",
            macro->filename, macro->startline, macro->endline, macro->u1.str);

      z->type = PV_RETURN;
      z->startline = macro->startline;
      z->endline = macro->endline;
      z->startcol = macro->startcol;
      z->endcol = macro->endcol;
      z->filename = strdup(macro->filename);

      macro->u3.macro_statements = z;
      return;
   }
   for (i=macro->u3.macro_statements; i; i=i->next) {
      /* if the last statement in the list is not return, then insert a return there */
      if (i->next == NULL) {
         if (i->type != PV_RETURN) {
            pval *z = calloc(1, sizeof(struct pval));
            ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The macro %s does not end with a return; I will insert one.\n",
                  macro->filename, macro->startline, macro->endline, macro->u1.str);

            z->type = PV_RETURN;
            z->startline = macro->startline;
            z->endline = macro->endline;
            z->startcol = macro->startcol;
            z->endcol = macro->endcol;
            z->filename = strdup(macro->filename);

            i->next = z;
            return;
         }
      }
   }
   return;
}



static int extension_matches(pval *here, const char *exten, const char *pattern)
{
   int err1;
   regex_t preg;
   
   /* simple case, they match exactly, the pattern and exten name */
   if (strcmp(pattern,exten) == 0)
      return 1;
   
   if (pattern[0] == '_') {
      char reg1[2000];
      const char *p;
      char *r = reg1;
      
      if ( strlen(pattern)*5 >= 2000 ) /* safety valve */ {
         ast_log(LOG_ERROR,"Error: The pattern %s is way too big. Pattern matching cancelled.\n",
               pattern);
         return 0;
      }
      /* form a regular expression from the pattern, and then match it against exten */
      *r++ = '^'; /* what if the extension is a pattern ?? */
      *r++ = '_'; /* what if the extension is a pattern ?? */
      *r++ = '?';
      for (p=pattern+1; *p; p++) {
         switch ( *p ) {
         case 'X':
            *r++ = '[';
            *r++ = '0';
            *r++ = '-';
            *r++ = '9';
            *r++ = 'X';
            *r++ = ']';
            break;
            
         case 'Z':
            *r++ = '[';
            *r++ = '1';
            *r++ = '-';
            *r++ = '9';
            *r++ = 'Z';
            *r++ = ']';
            break;
            
         case 'N':
            *r++ = '[';
            *r++ = '2';
            *r++ = '-';
            *r++ = '9';
            *r++ = 'N';
            *r++ = ']';
            break;
            
         case '[':
            while ( *p && *p != ']' ) {
               *r++ = *p++;
            }
            *r++ = ']';
            if ( *p != ']') {
               ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The extension pattern '%s' is missing a closing bracket \n",
                     here->filename, here->startline, here->endline, pattern);
            }
            break;
            
         case '.':
         case '!':
            *r++ = '.';
            *r++ = '*';
            break;
         case '*':
            *r++ = '\\';
            *r++ = '*';
            break;
         default:
            *r++ = *p;
            break;
            
         }
      }
      *r++ = '$'; /* what if the extension is a pattern ?? */
      *r++ = *p++; /* put in the closing null */
      err1 = regcomp(&preg, reg1, REG_NOSUB|REG_EXTENDED);
      if ( err1 ) {
         char errmess[500];
         regerror(err1,&preg,errmess,sizeof(errmess));
         regfree(&preg);
         ast_log(LOG_WARNING, "Regcomp of %s failed, error code %d\n",
               reg1, err1);
         return 0;
      }
      err1 = regexec(&preg, exten, 0, 0, 0);
      regfree(&preg);
      
      if ( err1 ) {
         /* ast_log(LOG_NOTICE,"*****************************[%d]Extension %s did not match %s(%s)\n",
            err1,exten, pattern, reg1); */
         return 0; /* no match */
      } else {
         /* ast_log(LOG_NOTICE,"*****************************Extension %s matched %s\n",
            exten, pattern); */
         return 1;
      }
      
      
   } else {
      if ( strcmp(exten,pattern) == 0 ) {
         return 1;
      } else
         return 0;
   }
}


static void check_expr2_input(pval *expr, char *str)
{
   int spaces = strspn(str,"\t \n");
   if ( !strncmp(str+spaces,"$[",2) ) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The expression '%s' is redundantly wrapped in '$[ ]'. \n",
            expr->filename, expr->startline, expr->endline, str);
      warns++;
   }
}

static void check_includes(pval *includes)
{
   struct pval *p4;
   for (p4=includes->u1.list; p4; p4=p4->next) {
      /* for each context pointed to, find it, then find a context/label that matches the
         target here! */
      char *incl_context = p4->u1.str;
      /* find a matching context name */
      struct pval *that_other_context = find_context(incl_context);
      if (!that_other_context && strcmp(incl_context, "parkedcalls") != 0) {
         ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The included context '%s' cannot be found.\n\
 (You may ignore this warning if '%s' exists in extensions.conf, or is created by another module. I cannot check for those.)\n",
               includes->filename, includes->startline, includes->endline, incl_context, incl_context);
         warns++;
      }
   }
}


static void check_timerange(pval *p)
{
   char *times;
   char *e;
   int s1, s2;
   int e1, e2;

   times = ast_strdupa(p->u1.str);

   /* Star is all times */
   if (ast_strlen_zero(times) || !strcmp(times, "*")) {
      return;
   }
   /* Otherwise expect a range */
   e = strchr(times, '-');
   if (!e) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The time range format (%s) requires a '-' surrounded by two 24-hour times of day!\n",
            p->filename, p->startline, p->endline, times);
      warns++;
      return;
   }
   *e = '\0';
   e++;
   while (*e && !isdigit(*e)) 
      e++;
   if (!*e) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The time range format (%s) is missing the end time!\n",
            p->filename, p->startline, p->endline, p->u1.str);
      warns++;
   }
   if (sscanf(times, "%2d:%2d", &s1, &s2) != 2) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The start time (%s) isn't quite right!\n",
            p->filename, p->startline, p->endline, times);
      warns++;
   }
   if (sscanf(e, "%2d:%2d", &e1, &e2) != 2) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The end time (%s) isn't quite right!\n",
            p->filename, p->startline, p->endline, times);
      warns++;
   }

   s1 = s1 * 30 + s2/2;
   if ((s1 < 0) || (s1 >= 24*30)) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The start time (%s) is out of range!\n",
            p->filename, p->startline, p->endline, times);
      warns++;
   }
   e1 = e1 * 30 + e2/2;
   if ((e1 < 0) || (e1 >= 24*30)) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The end time (%s) is out of range!\n",
            p->filename, p->startline, p->endline, e);
      warns++;
   }
   return;
}

static char *days[] =
{
   "sun",
   "mon",
   "tue",
   "wed",
   "thu",
   "fri",
   "sat",
};

/*! \brief  get_dow: Get day of week */
static void check_dow(pval *DOW)
{
   char *dow;
   char *c;
   /* The following line is coincidence, really! */
   int s, e;
   
   dow = ast_strdupa(DOW->u1.str);

   /* Check for all days */
   if (ast_strlen_zero(dow) || !strcmp(dow, "*"))
      return;
   /* Get start and ending days */
   c = strchr(dow, '-');
   if (c) {
      *c = '\0';
      c++;
   } else
      c = NULL;
   /* Find the start */
   s = 0;
   while ((s < 7) && strcasecmp(dow, days[s])) s++;
   if (s >= 7) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The day (%s) must be one of 'sun', 'mon', 'tue', 'wed', 'thu', 'fri', or 'sat'!\n",
            DOW->filename, DOW->startline, DOW->endline, dow);
      warns++;
   }
   if (c) {
      e = 0;
      while ((e < 7) && strcasecmp(c, days[e])) e++;
      if (e >= 7) {
         ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The end day (%s) must be one of 'sun', 'mon', 'tue', 'wed', 'thu', 'fri', or 'sat'!\n",
               DOW->filename, DOW->startline, DOW->endline, c);
         warns++;
      }
   } else
      e = s;
}

static void check_day(pval *DAY)
{
   char *day;
   char *c;
   /* The following line is coincidence, really! */
   int s, e;

   day = ast_strdupa(DAY->u1.str);

   /* Check for all days */
   if (ast_strlen_zero(day) || !strcmp(day, "*")) {
      return;
   }
   /* Get start and ending days */
   c = strchr(day, '-');
   if (c) {
      *c = '\0';
      c++;
   }
   /* Find the start */
   if (sscanf(day, "%2d", &s) != 1) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The start day of month (%s) must be a number!\n",
            DAY->filename, DAY->startline, DAY->endline, day);
      warns++;
   }
   else if ((s < 1) || (s > 31)) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The start day of month (%s) must be a number in the range [1-31]!\n",
            DAY->filename, DAY->startline, DAY->endline, day);
      warns++;
   }
   s--;
   if (c) {
      if (sscanf(c, "%2d", &e) != 1) {
         ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The end day of month (%s) must be a number!\n",
               DAY->filename, DAY->startline, DAY->endline, c);
         warns++;
      }
      else if ((e < 1) || (e > 31)) {
         ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The end day of month (%s) must be a number in the range [1-31]!\n",
               DAY->filename, DAY->startline, DAY->endline, day);
         warns++;
      }
      e--;
   } else
      e = s;
}

static char *months[] =
{
   "jan",
   "feb",
   "mar",
   "apr",
   "may",
   "jun",
   "jul",
   "aug",
   "sep",
   "oct",
   "nov",
   "dec",
};

static void check_month(pval *MON)
{
   char *mon;
   char *c;
   /* The following line is coincidence, really! */
   int s, e;

   mon = ast_strdupa(MON->u1.str);

   /* Check for all days */
   if (ast_strlen_zero(mon) || !strcmp(mon, "*")) 
      return ;
   /* Get start and ending days */
   c = strchr(mon, '-');
   if (c) {
      *c = '\0';
      c++;
   }
   /* Find the start */
   s = 0;
   while ((s < 12) && strcasecmp(mon, months[s])) s++;
   if (s >= 12) {
      ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The start month (%s) must be a one of: 'jan', 'feb', ..., 'dec'!\n",
            MON->filename, MON->startline, MON->endline, mon);
      warns++;
   }
   if (c) {
      e = 0;
      while ((e < 12) && strcasecmp(mon, months[e])) e++;
      if (e >= 12) {
         ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The end month (%s) must be a one of: 'jan', 'feb', ..., 'dec'!\n",
               MON->filename, MON->startline, MON->endline, c);
         warns++;
      }
   } else
      e = s;
}

static int check_break(pval *item)
{
   pval *p = item;
   
   while( p && p->type != PV_MACRO && p->type != PV_CONTEXT ) /* early cutout, sort of */ {
      /* a break is allowed in WHILE, FOR, CASE, DEFAULT, PATTERN; otherwise, it don't make
         no sense */
      if( p->type == PV_CASE || p->type == PV_DEFAULT || p->type == PV_PATTERN 
         || p->type == PV_WHILE || p->type == PV_FOR   ) {
         return 1;
      }
      p = p->dad;
   }
   ast_log(LOG_ERROR,"Error: file %s, line %d-%d: 'break' not in switch, for, or while statement!\n",
         item->filename, item->startline, item->endline);
   errs++;
   
   return 0;
}

static int check_continue(pval *item)
{
   pval *p = item;
   
   while( p && p->type != PV_MACRO && p->type != PV_CONTEXT ) /* early cutout, sort of */ {
      /* a break is allowed in WHILE, FOR, CASE, DEFAULT, PATTERN; otherwise, it don't make
         no sense */
      if( p->type == PV_WHILE || p->type == PV_FOR   ) {
         return 1;
      }
      p = p->dad;
   }
   ast_log(LOG_ERROR,"Error: file %s, line %d-%d: 'continue' not in 'for' or 'while' statement!\n",
         item->filename, item->startline, item->endline);
   errs++;
   
   return 0;
}

static struct pval *in_macro(pval *item)
{
   struct pval *curr;
   curr = item;   
   while( curr ) {
      if( curr->type == PV_MACRO  ) {
         return curr;
      }
      curr = curr->dad;
   }
   return 0;
}

static struct pval *in_context(pval *item)
{
   struct pval *curr;
   curr = item;   
   while( curr ) {
      if( curr->type == PV_MACRO || curr->type == PV_CONTEXT ) {
         return curr;
      }
      curr = curr->dad;
   }
   return 0;
}


/* general purpose goto finder */

static void check_label(pval *item)
{
   struct pval *curr;
   struct pval *x;
   int alright = 0;
   
   /* A label outside an extension just plain does not make sense! */
   
   curr = item;
   
   while( curr ) {
      if( curr->type == PV_MACRO || curr->type == PV_EXTENSION   ) {
         alright = 1;
         break;
      }
      curr = curr->dad;
   }
   if( !alright )
   {
      ast_log(LOG_ERROR,"Error: file %s, line %d-%d: Label %s is not within an extension or macro!\n",
            item->filename, item->startline, item->endline, item->u1.str);
      errs++;  
   }
   
   
   /* basically, ensure that a label is not repeated in a context. Period.
      The method:  well, for each label, find the first label in the context
      with the same name. If it's not the current label, then throw an error. */

   
   /* printf("==== check_label:   ====\n"); */
   if( !current_extension )
      curr = current_context;
   else
      curr = current_extension;
   
   x = find_first_label_in_current_context((char *)item->u1.str, curr);
   /* printf("Hey, check_label found with item = %x, and x is %x, and currcont is %x, label name is %s\n", item,x, current_context, (char *)item->u1.str); */
   if( x && x != item )
   {
      ast_log(LOG_ERROR,"Error: file %s, line %d-%d: Duplicate label %s! Previously defined at file %s, line %d.\n",
            item->filename, item->startline, item->endline, item->u1.str, x->filename, x->startline);
      errs++;
   }
   /* printf("<<<<< check_label:   ====\n"); */
}

static pval *get_goto_target(pval *item)
{
   /* just one item-- the label should be in the current extension */
   pval *curr_ext = get_extension_or_contxt(item); /* containing exten, or macro */
   pval *curr_cont;
   
   if (item->u1.list && !item->u1.list->next && !strstr((item->u1.list)->u1.str,"${")) {
      struct pval *x = find_label_in_current_extension((char*)((item->u1.list)->u1.str), curr_ext);
         return x;
   }

   curr_cont = get_contxt(item);

   /* TWO items */
   if (item->u1.list->next && !item->u1.list->next->next) {
      if (!strstr((item->u1.list)->u1.str,"${") 
         && !strstr(item->u1.list->next->u1.str,"${") ) /* Don't try to match variables */ {
         struct pval *x = find_label_in_current_context((char *)item->u1.list->u1.str, (char *)item->u1.list->next->u1.str, curr_cont);
            return x;
      }
   }
   
   /* All 3 items! */
   if (item->u1.list->next && item->u1.list->next->next) {
      /* all three */
      pval *first = item->u1.list;
      pval *second = item->u1.list->next;
      pval *third = item->u1.list->next->next;
      
      if (!strstr((item->u1.list)->u1.str,"${") 
         && !strstr(item->u1.list->next->u1.str,"${")
         && !strstr(item->u1.list->next->next->u1.str,"${")) /* Don't try to match variables */ {
         struct pval *x = find_label_in_current_db((char*)first->u1.str, (char*)second->u1.str, (char*)third->u1.str);
         if (!x) {

            struct pval *p3;
            struct pval *that_context = find_context(item->u1.list->u1.str);
            
            /* the target of the goto could be in an included context!! Fancy that!! */
            /* look for includes in the current context */
            if (that_context) {
               for (p3=that_context->u2.statements; p3; p3=p3->next) {
                  if (p3->type == PV_INCLUDES) {
                     struct pval *p4;
                     for (p4=p3->u1.list; p4; p4=p4->next) {
                        /* for each context pointed to, find it, then find a context/label that matches the
                           target here! */
                        char *incl_context = p4->u1.str;
                        /* find a matching context name */
                        struct pval *that_other_context = find_context(incl_context);
                        if (that_other_context) {
                           struct pval *x3;
                           x3 = find_label_in_current_context((char *)item->u1.list->next->u1.str, (char *)item->u1.list->next->next->u1.str, that_other_context);
                           if (x3) {
                              return x3;
                           }
                        }
                     }
                  }
               }
            }
         }
         return x;
      }
   }
   return 0;
}

static void check_goto(pval *item)
{
   /* check for the target of the goto-- does it exist? */
   if ( !(item->u1.list)->next && !(item->u1.list)->u1.str ) {
      ast_log(LOG_ERROR,"Error: file %s, line %d-%d: goto:  empty label reference found!\n",
            item->filename, item->startline, item->endline);
      errs++;
   }
   
   /* just one item-- the label should be in the current extension */
   
   if (item->u1.list && !item->u1.list->next && !strstr((item->u1.list)->u1.str,"${")) {
      struct pval *z = get_extension_or_contxt(item);
      struct pval *x = 0;
      if (z)
         x = find_label_in_current_extension((char*)((item->u1.list)->u1.str), z); /* if in macro, use current context instead */
      /* printf("Called find_label_in_current_extension with arg %s; current_extension is %x: %d\n",
         (char*)((item->u1.list)->u1.str), current_extension?current_extension:current_context, current_extension?current_extension->type:current_context->type); */
      if (!x) {
         ast_log(LOG_ERROR,"Error: file %s, line %d-%d: goto:  no label %s exists in the current extension!\n",
               item->filename, item->startline, item->endline, item->u1.list->u1.str);
         errs++;
      }
      else
         return;
   }
   
   /* TWO items */
   if (item->u1.list->next && !item->u1.list->next->next) {
      /* two items */
      /* printf("Calling find_label_in_current_context with args %s, %s\n",
         (char*)((item->u1.list)->u1.str), (char *)item->u1.list->next->u1.str); */
      if (!strstr((item->u1.list)->u1.str,"${") 
         && !strstr(item->u1.list->next->u1.str,"${") ) /* Don't try to match variables */ {
         struct pval *z = get_contxt(item);
         struct pval *x = 0;
         
         if (z)
            x = find_label_in_current_context((char *)item->u1.list->u1.str, (char *)item->u1.list->next->u1.str, z);

         if (!x) {
            ast_log(LOG_ERROR,"Error: file %s, line %d-%d: goto:  no label '%s,%s' exists in the current context, or any of its inclusions!\n",
                  item->filename, item->startline, item->endline, item->u1.list->u1.str, item->u1.list->next->u1.str );
            errs++;
         }
         else
            return;
      }
   }
   
   /* All 3 items! */
   if (item->u1.list->next && item->u1.list->next->next) {
      /* all three */
      pval *first = item->u1.list;
      pval *second = item->u1.list->next;
      pval *third = item->u1.list->next->next;
      
      /* printf("Calling find_label_in_current_db with args %s, %s, %s\n",
         (char*)first->u1.str, (char*)second->u1.str, (char*)third->u1.str); */
      if (!strstr((item->u1.list)->u1.str,"${") 
         && !strstr(item->u1.list->next->u1.str,"${")
         && !strstr(item->u1.list->next->next->u1.str,"${")) /* Don't try to match variables */ {
         struct pval *x = find_label_in_current_db((char*)first->u1.str, (char*)second->u1.str, (char*)third->u1.str);
         if (!x) {
            struct pval *p3;
            struct pval *found = 0;
            struct pval *that_context = find_context(item->u1.list->u1.str);
            
            /* the target of the goto could be in an included context!! Fancy that!! */
            /* look for includes in the current context */
            if (that_context) {
               for (p3=that_context->u2.statements; p3; p3=p3->next) {
                  if (p3->type == PV_INCLUDES) {
                     struct pval *p4;
                     for (p4=p3->u1.list; p4; p4=p4->next) {
                        /* for each context pointed to, find it, then find a context/label that matches the
                           target here! */
                        char *incl_context = p4->u1.str;
                        /* find a matching context name */
                        struct pval *that_other_context = find_context(incl_context);
                        if (that_other_context) {
                           struct pval *x3;
                           x3 = find_label_in_current_context((char *)item->u1.list->next->u1.str, (char *)item->u1.list->next->next->u1.str, that_other_context);
                           if (x3) {
                              found = x3;
                              break;
                           }
                        }
                     }
                  }
               }
               if (!found) {
                  ast_log(LOG_ERROR,"Error: file %s, line %d-%d: goto:  no label %s|%s exists in the context %s or its inclusions!\n",
                        item->filename, item->startline, item->endline, item->u1.list->next->u1.str, item->u1.list->next->next->u1.str, item->u1.list->u1.str );
                  errs++;
               } else {
                  struct pval *mac = in_macro(item); /* is this goto inside a macro? */
                  if( mac ) {    /* yes! */
                     struct pval *targ = in_context(found);
                     if( mac != targ )
                     {
                        ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: It's bad form to have a goto in a macro to a target outside the macro!\n",
                              item->filename, item->startline, item->endline);
                        warns++;                      
                     }
                  }
               }
            } else {
               /* here is where code would go to check for target existence in extensions.conf files */
#ifdef STANDALONE
               struct pbx_find_info pfiq = {.stacklen = 0 };
               extern int localized_pbx_load_module(void);
               /* if this is a standalone, we will need to make sure the 
                  localized load of extensions.conf is done */
               if (!extensions_dot_conf_loaded) {
                  localized_pbx_load_module();
                  extensions_dot_conf_loaded++;
               }

               pbx_find_extension(NULL, NULL, &pfiq, first->u1.str, second->u1.str, atoi(third->u1.str),
                                 atoi(third->u1.str) ? NULL : third->u1.str, NULL, 
                                 atoi(third->u1.str) ? E_MATCH : E_FINDLABEL);
               
               if (pfiq.status != STATUS_SUCCESS) {
                  ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: goto:  Couldn't find goto target %s|%s|%s, not even in extensions.conf!\n",
                        item->filename, item->startline, item->endline, first->u1.str, second->u1.str, third->u1.str);
                  warns++;
               }
#else
               ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: goto:  Couldn't find goto target %s|%s|%s in the AEL code!\n",
                     item->filename, item->startline, item->endline, first->u1.str, second->u1.str, third->u1.str);
               warns++;
#endif
            }
         } else {
            struct pval *mac = in_macro(item); /* is this goto inside a macro? */
            if( mac ) {    /* yes! */
               struct pval *targ = in_context(x);
               if( mac != targ )
               {
                  ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: It's bad form to have a goto in a macro to a target outside the macro!\n",
                        item->filename, item->startline, item->endline);
                  warns++;                      
               }
            }
         }
      }
   }
}
   

static void find_pval_goto_item(pval *item, int lev)
{
   struct pval *p4;
   
   if (lev>100) {
      ast_log(LOG_ERROR,"find_pval_goto in infinite loop! item_type: %d\n\n", item->type);
      return;
   }
   
   switch ( item->type ) {
   case PV_MACRO:
      /* fields: item->u1.str     == name of macro
                 item->u2.arglist == pval list of PV_WORD arguments of macro, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg

               item->u3.macro_statements == pval list of statements in macro body.
      */
         
      /* printf("Descending into macro %s at line %d\n", item->u1.str, item->startline); */
      find_pval_gotos(item->u3.macro_statements,lev+1); /* if we're just searching for a context, don't bother descending into them */
      
      break;
         
   case PV_CONTEXT:
      /* fields: item->u1.str     == name of context
                 item->u2.statements == pval list of statements in context body
               item->u3.abstract == int 1 if an abstract keyword were present
      */
      break;

   case PV_CASE:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      /* printf("Descending into Case of %s\n", item->u1.str); */
      find_pval_gotos(item->u2.statements,lev+1);
      break;
         
   case PV_PATTERN:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      /* printf("Descending into Pattern of %s\n", item->u1.str); */
      find_pval_gotos(item->u2.statements,lev+1);
      break;
         
   case PV_DEFAULT:
      /* fields: 
                 item->u2.statements == pval list of statements under the case
      */
      /* printf("Descending into default\n"); */
      find_pval_gotos(item->u2.statements,lev+1);
      break;
         
   case PV_CATCH:
      /* fields: item->u1.str     == name of extension to catch
                 item->u2.statements == pval list of statements in context body
      */
      /* printf("Descending into catch of %s\n", item->u1.str); */
      find_pval_gotos(item->u2.statements,lev+1);
      break;
         
   case PV_STATEMENTBLOCK:
      /* fields: item->u1.list     == pval list of statements in block, one per entry in the list
      */
      /* printf("Descending into statement block\n"); */
      find_pval_gotos(item->u1.list,lev+1);
      break;
         
   case PV_GOTO:
      /* fields: item->u1.list     == pval list of PV_WORD target names, up to 3, in order as given by user.
                 item->u1.list->u1.str  == where the data on a PV_WORD will always be.
      */
      check_goto(item);  /* THE WHOLE FUNCTION OF THIS ENTIRE ROUTINE!!!! */
      break;
         
   case PV_INCLUDES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      for (p4=item->u1.list; p4; p4=p4->next) {
         /* for each context pointed to, find it, then find a context/label that matches the
            target here! */
         char *incl_context = p4->u1.str;
         /* find a matching context name */
         struct pval *that_context = find_context(incl_context);
         if (that_context && that_context->u2.statements) {
            /* printf("Descending into include of '%s' at line %d; that_context=%s, that_context type=%d\n", incl_context, item->startline, that_context->u1.str, that_context->type); */
            find_pval_gotos(that_context->u2.statements,lev+1); /* keep working up the includes */
         }
      }
      break;
      
   case PV_FOR:
      /* fields: item->u1.for_init     == a string containing the initalizer
                 item->u2.for_test     == a string containing the loop test
                 item->u3.for_inc      == a string containing the loop increment

               item->u4.for_statements == a pval list of statements in the for ()
      */
      /* printf("Descending into for at line %d\n", item->startline); */
      find_pval_gotos(item->u4.for_statements,lev+1);
      break;
         
   case PV_WHILE:
      /* fields: item->u1.str        == the while conditional, as supplied by user

               item->u2.statements == a pval list of statements in the while ()
      */
      /* printf("Descending into while at line %d\n", item->startline); */
      find_pval_gotos(item->u2.statements,lev+1);
      break;
         
   case PV_RANDOM:
      /* fields: item->u1.str        == the random number expression, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
       fall thru to PV_IF */
      
   case PV_IFTIME:
      /* fields: item->u1.list        == the time values, 4 of them, as PV_WORD structs in a list

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      fall thru to PV_IF*/
   case PV_IF:
      /* fields: item->u1.str        == the if conditional, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      /* printf("Descending into random/iftime/if at line %d\n", item->startline); */
      find_pval_gotos(item->u2.statements,lev+1);

      if (item->u3.else_statements) {
         /* printf("Descending into random/iftime/if's ELSE at line %d\n", item->startline); */
         find_pval_gotos(item->u3.else_statements,lev+1);
      }
      break;
         
   case PV_SWITCH:
      /* fields: item->u1.str        == the switch expression

               item->u2.statements == a pval list of statements in the switch, 
                                    (will be case statements, most likely!)
      */
      /* printf("Descending into switch at line %d\n", item->startline); */
      find_pval_gotos(item->u3.else_statements,lev+1);
      break;
         
   case PV_EXTENSION:
      /* fields: item->u1.str        == the extension name, label, whatever it's called

               item->u2.statements == a pval list of statements in the extension
               item->u3.hints      == a char * hint argument
               item->u4.regexten   == an int boolean. non-zero says that regexten was specified
      */

      /* printf("Descending into extension %s at line %d\n", item->u1.str, item->startline); */
      find_pval_gotos(item->u2.statements,lev+1);
      break;

   default:
      break;
   }
}

static void find_pval_gotos(pval *item,int lev)
{
   pval *i;
   
   for (i=item; i; i=i->next) {
      /* printf("About to call pval_goto_item, itemcount=%d, itemtype=%d\n", item_count, i->type); */
      find_pval_goto_item(i, lev);
   }
}



/* general purpose label finder */
static struct pval *match_pval_item(pval *item)
{
   pval *x;
   
   switch ( item->type ) {
   case PV_MACRO:
      /* fields: item->u1.str     == name of macro
                 item->u2.arglist == pval list of PV_WORD arguments of macro, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg

               item->u3.macro_statements == pval list of statements in macro body.
      */
      /* printf("    matching in MACRO %s, match_context=%s; retoncontmtch=%d; \n", item->u1.str, match_context, return_on_context_match); */
      if (!strcmp(match_context,"*") || !strcmp(item->u1.str, match_context)) {
         
         /* printf("MACRO: match context is: %s\n", match_context); */
         
         if (return_on_context_match && !strcmp(item->u1.str, match_context)) /* if we're just searching for a context, don't bother descending into them */ {
            /* printf("Returning on matching macro %s\n", match_context); */
            return item;
         }
         
         
         if (!return_on_context_match) {
            /* printf("Descending into matching macro %s/%s\n", match_context, item->u1.str); */
            if ((x=match_pval(item->u3.macro_statements)))  {
               /* printf("Responded with pval match %x\n", x); */
               return x;
            }
         }
      } else {
         /* printf("Skipping context/macro %s\n", item->u1.str); */
      }
      
      break;
         
   case PV_CONTEXT:
      /* fields: item->u1.str     == name of context
                 item->u2.statements == pval list of statements in context body
               item->u3.abstract == int 1 if an abstract keyword were present
      */
      /* printf("    matching in CONTEXT\n"); */
      if (!strcmp(match_context,"*") || !strcmp(item->u1.str, match_context)) {
         if (return_on_context_match && !strcmp(item->u1.str, match_context)) {
            /* printf("Returning on matching context %s\n", match_context); */
            /* printf("non-CONTEXT: Responded with pval match %x\n", x); */
            return item;
         }
         
         if (!return_on_context_match ) {
            /* printf("Descending into matching context %s\n", match_context); */
            if ((x=match_pval(item->u2.statements))) /* if we're just searching for a context, don't bother descending into them */ {
               /* printf("CONTEXT: Responded with pval match %x\n", x); */
               return x;
            }
         }
      } else {
         /* printf("Skipping context/macro %s\n", item->u1.str); */
      }
      break;

   case PV_CASE:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      /* printf("    matching in CASE\n"); */
      if ((x=match_pval(item->u2.statements))) {
         /* printf("CASE: Responded with pval match %x\n", x); */
         return x;
      }
      break;
         
   case PV_PATTERN:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      /* printf("    matching in PATTERN\n"); */
      if ((x=match_pval(item->u2.statements))) {
         /* printf("PATTERN: Responded with pval match %x\n", x); */
         return x;
      }
      break;
         
   case PV_DEFAULT:
      /* fields: 
                 item->u2.statements == pval list of statements under the case
      */
      /* printf("    matching in DEFAULT\n"); */
      if ((x=match_pval(item->u2.statements))) {
         /* printf("DEFAULT: Responded with pval match %x\n", x); */
         return x;
      }
      break;
         
   case PV_CATCH:
      /* fields: item->u1.str     == name of extension to catch
                 item->u2.statements == pval list of statements in context body
      */
      /* printf("    matching in CATCH\n"); */
      if ((x=match_pval(item->u2.statements))) {
         /* printf("CATCH: Responded with pval match %x\n", x); */
         return x;
      }
      break;
         
   case PV_STATEMENTBLOCK:
      /* fields: item->u1.list     == pval list of statements in block, one per entry in the list
      */
      /* printf("    matching in STATEMENTBLOCK\n"); */
      if ((x=match_pval(item->u1.list))) {
         /* printf("STATEMENTBLOCK: Responded with pval match %x\n", x); */
         return x;
      }
      break;
         
   case PV_LABEL:
      /* fields: item->u1.str     == label name
      */
      /* printf("PV_LABEL %s (cont=%s, exten=%s\n", 
         item->u1.str, current_context->u1.str, (current_extension?current_extension->u1.str:"<macro>"));*/
      
      if (count_labels) {
         if (!strcmp(match_label, item->u1.str)) {
            label_count++;
            last_matched_label = item;
         }
         
      } else {
         if (!strcmp(match_label, item->u1.str)) {
            /* printf("LABEL: Responded with pval match %x\n", x); */
            return item;
         }
      }
      break;
         
   case PV_FOR:
      /* fields: item->u1.for_init     == a string containing the initalizer
                 item->u2.for_test     == a string containing the loop test
                 item->u3.for_inc      == a string containing the loop increment

               item->u4.for_statements == a pval list of statements in the for ()
      */
      /* printf("    matching in FOR\n"); */
      if ((x=match_pval(item->u4.for_statements))) {
         /* printf("FOR: Responded with pval match %x\n", x);*/
         return x;
      }
      break;
         
   case PV_WHILE:
      /* fields: item->u1.str        == the while conditional, as supplied by user

               item->u2.statements == a pval list of statements in the while ()
      */
      /* printf("    matching in WHILE\n"); */
      if ((x=match_pval(item->u2.statements))) {
         /* printf("WHILE: Responded with pval match %x\n", x); */
         return x;
      }
      break;
         
   case PV_RANDOM:
      /* fields: item->u1.str        == the random number expression, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
       fall thru to PV_IF */
      
   case PV_IFTIME:
      /* fields: item->u1.list        == the time values, 4 of them, as PV_WORD structs in a list

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      fall thru to PV_IF*/
   case PV_IF:
      /* fields: item->u1.str        == the if conditional, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      /* printf("    matching in IF/IFTIME/RANDOM\n"); */
      if ((x=match_pval(item->u2.statements))) {
         return x;
      }
      if (item->u3.else_statements) {
         if ((x=match_pval(item->u3.else_statements))) {
            /* printf("IF/IFTIME/RANDOM: Responded with pval match %x\n", x); */
            return x;
         }
      }
      break;
         
   case PV_SWITCH:
      /* fields: item->u1.str        == the switch expression

               item->u2.statements == a pval list of statements in the switch, 
                                    (will be case statements, most likely!)
      */
      /* printf("    matching in SWITCH\n"); */
      if ((x=match_pval(item->u2.statements))) {
         /* printf("SWITCH: Responded with pval match %x\n", x); */
         return x;
      }
      break;
         
   case PV_EXTENSION:
      /* fields: item->u1.str        == the extension name, label, whatever it's called

               item->u2.statements == a pval list of statements in the extension
               item->u3.hints      == a char * hint argument
               item->u4.regexten   == an int boolean. non-zero says that regexten was specified
      */
      /* printf("    matching in EXTENSION\n"); */
      if (!strcmp(match_exten,"*") || extension_matches(item, match_exten, item->u1.str) ) {
         /* printf("Descending into matching exten %s => %s\n", match_exten, item->u1.str); */
         if (strcmp(match_label,"1") == 0) {
            if (item->u2.statements) {
               struct pval *p5 = item->u2.statements;
               while (p5 && p5->type == PV_LABEL)  /* find the first non-label statement in this context. If it exists, there's a "1" */
                  p5 = p5->next;
               if (p5)
                  return p5;
               else
                  return 0;
            }
            else
               return 0;
         }

         if ((x=match_pval(item->u2.statements))) {
            /* printf("EXTENSION: Responded with pval match %x\n", x); */
            return x;
         }
      } else {
         /* printf("Skipping exten %s\n", item->u1.str); */
      }
      break;
   default:
      /* printf("    matching in default = %d\n", item->type); */
      break;
   }
   return 0;
}

struct pval *match_pval(pval *item)
{
   pval *i;

   for (i=item; i; i=i->next) {
      pval *x;
      /* printf("   -- match pval: item %d\n", i->type); */
      
      if ((x = match_pval_item(i))) {
         /* printf("match_pval: returning x=%x\n", (int)x); */
         return x; /* cut the search short */
      }
   }
   return 0;
}

#if 0
int count_labels_in_current_context(char *label)
{
   label_count = 0;
   count_labels = 1;
   return_on_context_match = 0;
   match_pval(current_context->u2.statements);
   
   return label_count;
}
#endif

struct pval *find_first_label_in_current_context(char *label, pval *curr_cont)
{
   /* printf("  --- Got args %s, %s\n", exten, label); */
   struct pval *ret;
   struct pval *p3;
   
   count_labels = 0;
   return_on_context_match = 0;
   match_context = "*";
   match_exten = "*";
   match_label = label;
   
   ret =  match_pval(curr_cont);
   if (ret)
      return ret;
               
   /* the target of the goto could be in an included context!! Fancy that!! */
   /* look for includes in the current context */
   for (p3=curr_cont->u2.statements; p3; p3=p3->next) {
      if (p3->type == PV_INCLUDES) {
         struct pval *p4;
         for (p4=p3->u1.list; p4; p4=p4->next) {
            /* for each context pointed to, find it, then find a context/label that matches the
               target here! */
            char *incl_context = p4->u1.str;
            /* find a matching context name */
            struct pval *that_context = find_context(incl_context);
            if (that_context) {
               struct pval *x3;
               x3 = find_first_label_in_current_context(label, that_context);
               if (x3) {
                  return x3;
               }
            }
         }
      }
   }
   return 0;
}

struct pval *find_label_in_current_context(char *exten, char *label, pval *curr_cont)
{
   /* printf("  --- Got args %s, %s\n", exten, label); */
   struct pval *ret;
   struct pval *p3;
   
   count_labels = 0;
   return_on_context_match = 0;
   match_context = "*";
   match_exten = exten;
   match_label = label;
   ret =  match_pval(curr_cont->u2.statements);
   if (ret)
      return ret;
               
   /* the target of the goto could be in an included context!! Fancy that!! */
   /* look for includes in the current context */
   for (p3=curr_cont->u2.statements; p3; p3=p3->next) {
      if (p3->type == PV_INCLUDES) {
         struct pval *p4;
         for (p4=p3->u1.list; p4; p4=p4->next) {
            /* for each context pointed to, find it, then find a context/label that matches the
               target here! */
            char *incl_context = p4->u1.str;
            /* find a matching context name */
            struct pval *that_context = find_context(incl_context);
            if (that_context) {
               struct pval *x3;
               x3 = find_label_in_current_context(exten, label, that_context);
               if (x3) {
                  return x3;
               }
            }
         }
      }
   }
   return 0;
}

static struct pval *find_label_in_current_extension(const char *label, pval *curr_ext)
{
   /* printf("  --- Got args %s\n", label); */
   count_labels = 0;
   return_on_context_match = 0;
   match_context = "*";
   match_exten = "*";
   match_label = label;
   return match_pval(curr_ext);
}

static struct pval *find_label_in_current_db(const char *context, const char *exten, const char *label)
{
   /* printf("  --- Got args %s, %s, %s\n", context, exten, label); */
   count_labels = 0;
   return_on_context_match = 0;

   match_context = context;
   match_exten = exten;
   match_label = label;
   
   return match_pval(current_db);
}


struct pval *find_macro(char *name)
{
   return_on_context_match = 1;
   count_labels = 0;
   match_context = name;
   match_exten = "*";  /* don't really need to set these, shouldn't be reached */
   match_label = "*";
   return match_pval(current_db);
}

struct pval *find_context(char *name)
{
   return_on_context_match = 1;
   count_labels = 0;
   match_context = name;
   match_exten = "*";  /* don't really need to set these, shouldn't be reached */
   match_label = "*";
   return match_pval(current_db);
}

int is_float(char *arg )
{
   char *s;
   for (s=arg; *s; s++) {
      if (*s != '.' && (*s < '0' || *s > '9'))
         return 0;
   }
   return 1;
}
int is_int(char *arg )
{
   char *s;
   for (s=arg; *s; s++) {
      if (*s < '0' || *s > '9')
         return 0;
   }
   return 1;
}
int is_empty(char *arg)
{
   if (!arg)
      return 1;
   if (*arg == 0)
      return 1;
   while (*arg) {
      if (*arg != ' ' && *arg != '\t')
         return 0;
      arg++;
   }
   return 1;
}

#ifdef AAL_ARGCHECK
int option_matches_j( struct argdesc *should, pval *is, struct argapp *app)
{
   struct argchoice *ac;
   char *opcop,*q,*p;
   
   switch (should->dtype) {
   case ARGD_OPTIONSET:
      if ( strstr(is->u1.str,"${") )
         return 0;  /* no checking anything if there's a var reference in there! */
         
      opcop = ast_strdupa(is->u1.str);

      for (q=opcop;*q;q++) { /* erase the innards of X(innard) type arguments, so we don't get confused later */
         if ( *q == '(' ) {
            p = q+1;
            while (*p && *p != ')' )
               *p++ = '+';
            q = p+1;
         }
      }
      
      for (ac=app->opts; ac; ac=ac->next) {
         if (strlen(ac->name)>1  && strchr(ac->name,'(') == 0 && strcmp(ac->name,is->u1.str) == 0) /* multichar option, no parens, and a match? */
            return 0;
      }
      for (ac=app->opts; ac; ac=ac->next) {
         if (strlen(ac->name)==1  ||  strchr(ac->name,'(')) {
            char *p = strchr(opcop,ac->name[0]);  /* wipe out all matched options in the user-supplied string */
            
            if (p && *p == 'j') {
               ast_log(LOG_ERROR, "Error: file %s, line %d-%d: The j option in the %s application call is not appropriate for AEL!\n",
                     is->filename, is->startline, is->endline, app->name);
               errs++;
            }
            
            if (p) {
               *p = '+';
               if (ac->name[1] == '(') {
                  if (*(p+1) != '(') {
                     ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The %c option in the %s application call should have an (argument), but doesn't!\n",
                           is->filename, is->startline, is->endline, ac->name[0], app->name);
                     warns++;
                  }
               }
            }
         }
      }
      for (q=opcop; *q; q++) {
         if ( *q != '+' && *q != '(' && *q != ')') {
            ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: The %c option in the %s application call is not available as an option!\n",
                  is->filename, is->startline, is->endline, *q, app->name);
            warns++;
         }
      }
      return 1;
      break;
   default:
      return 0;
   }
   
}

int option_matches( struct argdesc *should, pval *is, struct argapp *app)
{
   struct argchoice *ac;
   char *opcop;
   
   switch (should->dtype) {
   case ARGD_STRING:
      if (is_empty(is->u1.str) && should->type == ARGD_REQUIRED)
         return 0;
      if (is->u1.str && strlen(is->u1.str) > 0) /* most will match */
         return 1;
      break;
      
   case ARGD_INT:
      if (is_int(is->u1.str))
         return 1;
      else
         return 0;
      break;
      
   case ARGD_FLOAT:
      if (is_float(is->u1.str))
         return 1;
      else
         return 0;
      break;
      
   case ARGD_ENUM:
      if( !is->u1.str || strlen(is->u1.str) == 0 )
         return 1; /* a null arg in the call will match an enum, I guess! */
      for (ac=should->choices; ac; ac=ac->next) {
         if (strcmp(ac->name,is->u1.str) == 0)
            return 1;
      }
      return 0;
      break;
      
   case ARGD_OPTIONSET:
      opcop = ast_strdupa(is->u1.str);
      
      for (ac=app->opts; ac; ac=ac->next) {
         if (strlen(ac->name)>1  && strchr(ac->name,'(') == 0 && strcmp(ac->name,is->u1.str) == 0) /* multichar option, no parens, and a match? */
            return 1;
      }
      for (ac=app->opts; ac; ac=ac->next) {
         if (strlen(ac->name)==1  ||  strchr(ac->name,'(')) {
            char *p = strchr(opcop,ac->name[0]);  /* wipe out all matched options in the user-supplied string */
            
            if (p) {
               *p = '+';
               if (ac->name[1] == '(') {
                  if (*(p+1) == '(') {
                     char *q = p+1;
                     while (*q && *q != ')') {
                        *q++ = '+';
                     }
                     *q = '+';
                  }
               }
            }
         }
      }
      return 1;
      break;
   case ARGD_VARARG:
      return 1; /* matches anything */
      break;
   }
   return 1; /* unless some for-sure match or non-match returns, then it must be close enough ... */
}
#endif

int check_app_args(pval* appcall, pval *arglist, struct argapp *app)
{
#ifdef AAL_ARGCHECK
   struct argdesc *ad = app->args;
   pval *pa;
   int z;
   
   for (pa = arglist; pa; pa=pa->next) {
      if (!ad) {
         ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: Extra argument %s not in application call to %s !\n",
               arglist->filename, arglist->startline, arglist->endline, pa->u1.str, app->name);
         warns++;
         return 1;
      } else {
         /* find the first entry in the ad list that will match */
         do {
            if ( ad->dtype == ARGD_VARARG ) /* once we hit the VARARG, all bets are off. Discontinue the comparisons */
               break;
            
            z= option_matches( ad, pa, app);
            if (!z) {
               if ( !arglist )
                  arglist=appcall;
               
               if (ad->type == ARGD_REQUIRED) {
                  ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: Required argument %s not in application call to %s !\n",
                        arglist->filename, arglist->startline, arglist->endline, ad->dtype==ARGD_OPTIONSET?"options":ad->name, app->name);
                  warns++;
                  return 1;
               }
            } else if (z && ad->dtype == ARGD_OPTIONSET) {
               option_matches_j( ad, pa, app);
            }
            ad = ad->next;
         } while (ad && !z);
      }
   }
   /* any app nodes left, that are not optional? */
   for ( ; ad; ad=ad->next) {
      if (ad->type == ARGD_REQUIRED && ad->dtype != ARGD_VARARG) {
         if ( !arglist ) 
            arglist=appcall;
         ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: Required argument %s not in application call to %s !\n",
               arglist->filename, arglist->startline, arglist->endline, ad->dtype==ARGD_OPTIONSET?"options":ad->name, app->name);
         warns++;
         return 1;
      }
   }
   return 0;
#else
   return 0;
#endif
}

void check_switch_expr(pval *item, struct argapp *apps)
{
#ifdef AAL_ARGCHECK
   /* get and clean the variable name */
   char *buff1, *p;
   struct argapp *a,*a2;
   struct appsetvar *v,*v2;
   struct argchoice *c;
   pval *t;
   
   p = item->u1.str;
   while (p && *p && (*p == ' ' || *p == '\t' || *p == '$' || *p == '{' ) )
      p++;
   
   buff1 = ast_strdupa(p);

   while (strlen(buff1) > 0 && ( buff1[strlen(buff1)-1] == '}' || buff1[strlen(buff1)-1] == ' ' || buff1[strlen(buff1)-1] == '\t'))
      buff1[strlen(buff1)-1] = 0;
   /* buff1 now contains the variable name */
   v = 0;
   for (a=apps; a; a=a->next) {
      for (v=a->setvars;v;v=v->next) {
         if (strcmp(v->name,buff1) == 0) {
            break;
         }
      }
      if ( v )
         break;
   }
   if (v && v->vals) {
      /* we have a match, to a variable that has a set of determined values */
      int def= 0;
      int pat = 0;
      int f1 = 0;
      
      /* first of all, does this switch have a default case ? */
      for (t=item->u2.statements; t; t=t->next) {
         if (t->type == PV_DEFAULT) {
            def =1;
            break;
         }
         if (t->type == PV_PATTERN) {
            pat++;
         }
      }
      if (def || pat) /* nothing to check. All cases accounted for! */
         return;
      for (c=v->vals; c; c=c->next) {
         f1 = 0;
         for (t=item->u2.statements; t; t=t->next) {
            if (t->type == PV_CASE || t->type == PV_PATTERN) {
               if (!strcmp(t->u1.str,c->name)) {
                  f1 = 1;
                  break;
               }
            }
         }
         if (!f1) {
            ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: switch with expression(%s) does not handle the case of %s !\n",
                  item->filename, item->startline, item->endline, item->u1.str, c->name);
            warns++;
         }
      }
      /* next, is there an app call in the current exten, that would set this var? */
      f1 = 0;
      t = current_extension->u2.statements;
      if ( t && t->type == PV_STATEMENTBLOCK )
         t = t->u1.statements;
      for (; t && t != item; t=t->next) {
         if (t->type == PV_APPLICATION_CALL) {
            /* find the application that matches the u1.str */
            for (a2=apps; a2; a2=a2->next) {
               if (strcasecmp(a2->name, t->u1.str)==0) {
                  for (v2=a2->setvars; v2; v2=v2->next) {
                     if (strcmp(v2->name, buff1) == 0) {
                        /* found an app that sets the var */
                        f1 = 1;
                        break;
                     }
                  }
               }
               if (f1)
                  break;
            }
         }
         if (f1)
            break;
      }
            
      /* see if it sets the var */
      if (!f1) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: Couldn't find an application call in this extension that sets the  expression (%s) value!\n",
               item->filename, item->startline, item->endline, item->u1.str);
         warns++;
      }
   }
#else
   pval *t,*tl=0,*p2;
   int def= 0;
   
   /* first of all, does this switch have a default case ? */
   for (t=item->u2.statements; t; t=t->next) {
      if (t->type == PV_DEFAULT) {
         def =1;
         break;
      }
      tl = t;
   }
   if (def) /* nothing to check. All cases accounted for! */
      return;
   /* if no default, warn and insert a default case at the end */
   p2 = tl->next = calloc(1, sizeof(struct pval));
   
   p2->type = PV_DEFAULT;
   p2->startline = tl->startline;
   p2->endline = tl->endline;
   p2->startcol = tl->startcol;
   p2->endcol = tl->endcol;
   p2->filename = strdup(tl->filename);
   ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: A default case was automatically added to the switch.\n",
         p2->filename, p2->startline, p2->endline);
   warns++;
   
#endif
}

static void check_context_names(void)
{
   pval *i,*j;
   for (i=current_db; i; i=i->next) {
      if (i->type == PV_CONTEXT || i->type == PV_MACRO) {
         for (j=i->next; j; j=j->next) {
            if ( j->type == PV_CONTEXT || j->type == PV_MACRO ) {
               if ( !strcmp(i->u1.str, j->u1.str) && !(i->u3.abstract&2) && !(j->u3.abstract&2) )
               {
                  ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: The context name (%s) is also declared in file %s, line %d-%d! (and neither is marked 'extend')\n",
                        i->filename, i->startline, i->endline, i->u1.str,  j->filename, j->startline, j->endline);
                  warns++;
               }
            }
         }
      }
   }
}

static void check_abstract_reference(pval *abstract_context)
{
   pval *i,*j;
   /* find some context includes that reference this context */
   

   /* otherwise, print out a warning */
   for (i=current_db; i; i=i->next) {
      if (i->type == PV_CONTEXT) {
         for (j=i->u2. statements; j; j=j->next) {
            if ( j->type == PV_INCLUDES ) {
               struct pval *p4;
               for (p4=j->u1.list; p4; p4=p4->next) {
                  /* for each context pointed to, find it, then find a context/label that matches the
                     target here! */
                  if ( !strcmp(p4->u1.str, abstract_context->u1.str) )
                     return; /* found a match! */
               }
            }
         }
      }
   }
   ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: Couldn't find a reference to this abstract context (%s) in any other context!\n",
         abstract_context->filename, abstract_context->startline, abstract_context->endline, abstract_context->u1.str);
   warns++;
}


void check_pval_item(pval *item, struct argapp *apps, int in_globals)
{
   pval *lp;
#ifdef AAL_ARGCHECK
   struct argapp *app, *found;
#endif
   struct pval *macro_def;
   struct pval *app_def;

   char errmsg[4096];
   char *strp;
   
   switch (item->type) {
   case PV_WORD:
      /* fields: item->u1.str == string associated with this (word).
                 item->u2.arglist  == pval list of 4 PV_WORD elements for time values (only in PV_INCLUDES) */
      break;
      
   case PV_MACRO:
      /* fields: item->u1.str     == name of macro
                 item->u2.arglist == pval list of PV_WORD arguments of macro, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg

               item->u3.macro_statements == pval list of statements in macro body.
      */
      in_abstract_context = 0;
      current_context = item;
      current_extension = 0;

      check_macro_returns(item);
      
      for (lp=item->u2.arglist; lp; lp=lp->next) {
      
      }
      check_pval(item->u3.macro_statements, apps,in_globals);
      break;
         
   case PV_CONTEXT:
      /* fields: item->u1.str     == name of context
                 item->u2.statements == pval list of statements in context body
               item->u3.abstract == int 1 if an abstract keyword were present
      */
      current_context = item;
      current_extension = 0;
      if ( item->u3.abstract ) {
         in_abstract_context = 1;
         check_abstract_reference(item);
      } else
         in_abstract_context = 0;
      check_pval(item->u2.statements, apps,in_globals);
      break;
         
   case PV_MACRO_CALL:
      /* fields: item->u1.str     == name of macro to call
                 item->u2.arglist == pval list of PV_WORD arguments of macro call, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg
      */
#ifdef STANDALONE
      /* if this is a standalone, we will need to make sure the 
         localized load of extensions.conf is done */
      if (!extensions_dot_conf_loaded) {
         localized_pbx_load_module();
         extensions_dot_conf_loaded++;
      }
#endif
      macro_def = find_macro(item->u1.str);
      if (!macro_def) {
#ifdef STANDALONE
         struct pbx_find_info pfiq = {.stacklen = 0 };
         struct pbx_find_info pfiq2 = {.stacklen = 0 };

         /* look for the macro in the extensions.conf world */
         pbx_find_extension(NULL, NULL, &pfiq, item->u1.str, "s", 1, NULL, NULL, E_MATCH);
         
         if (pfiq.status != STATUS_SUCCESS) {
            char namebuf2[256];
            snprintf(namebuf2, 256, "macro-%s", item->u1.str);
            
            /* look for the macro in the extensions.conf world */
            pbx_find_extension(NULL, NULL, &pfiq2, namebuf2, "s", 1, NULL, NULL, E_MATCH);
            
            if (pfiq2.status == STATUS_SUCCESS) {
               ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: macro call to non-existent %s! (macro-%s was found in the extensions.conf stuff, but we are using gosubs!)\n",
                     item->filename, item->startline, item->endline, item->u1.str, item->u1.str);
               warns++;
            } else {
               ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: macro call to non-existent %s! (Not even in the extensions.conf stuff!)\n",
                     item->filename, item->startline, item->endline, item->u1.str);
               warns++;
            }
         }
#else
         ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: macro call to %s cannot be found in the AEL code!\n",
               item->filename, item->startline, item->endline, item->u1.str);
         warns++;
         
#endif
#ifdef THIS_IS_1DOT4
         char namebuf2[256];
         snprintf(namebuf2, 256, "macro-%s", item->u1.str);

         /* look for the macro in the extensions.conf world */
         pbx_find_extension(NULL, NULL, &pfiq, namebuf2, "s", 1, NULL, NULL, E_MATCH);
         
         if (pfiq.status != STATUS_SUCCESS) {
            ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: macro call to %s was not found in the AEL, nor the extensions.conf !\n",
                  item->filename, item->startline, item->endline, item->u1.str);
            warns++;
         }
         
#endif

      } else if (macro_def->type != PV_MACRO) {
         ast_log(LOG_ERROR,"Error: file %s, line %d-%d: macro call to %s references a context, not a macro!\n",
               item->filename, item->startline, item->endline, item->u1.str);
         errs++;
      } else {
         /* macro_def is a MACRO, so do the args match in number? */
         int hereargs = 0;
         int thereargs = 0;
         
         for (lp=item->u2.arglist; lp; lp=lp->next) {
            hereargs++;
         }
         for (lp=macro_def->u2.arglist; lp; lp=lp->next) {
            thereargs++;
         }
         if (hereargs != thereargs ) {
            ast_log(LOG_ERROR, "Error: file %s, line %d-%d: The macro call to %s has %d arguments, but the macro definition has %d arguments\n",
                  item->filename, item->startline, item->endline, item->u1.str, hereargs, thereargs);
            errs++;
         }
      }
      break;
         
   case PV_APPLICATION_CALL:
      /* fields: item->u1.str     == name of application to call
                 item->u2.arglist == pval list of PV_WORD arguments of macro call, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg
      */
      /* Need to check to see if the application is available! */
      app_def = find_context(item->u1.str);
      if (app_def && app_def->type == PV_MACRO) {
         ast_log(LOG_ERROR,"Error: file %s, line %d-%d: application call to %s references an existing macro, but had no & preceding it!\n",
               item->filename, item->startline, item->endline, item->u1.str);
         errs++;
      }
      if (strcasecmp(item->u1.str,"GotoIf") == 0
         || strcasecmp(item->u1.str,"GotoIfTime") == 0
         || strcasecmp(item->u1.str,"while") == 0
         || strcasecmp(item->u1.str,"endwhile") == 0
         || strcasecmp(item->u1.str,"random") == 0
         || strcasecmp(item->u1.str,"gosub") == 0
         || strcasecmp(item->u1.str,"gosubif") == 0
         || strcasecmp(item->u1.str,"continuewhile") == 0
         || strcasecmp(item->u1.str,"endwhile") == 0
         || strcasecmp(item->u1.str,"execif") == 0
         || strcasecmp(item->u1.str,"execiftime") == 0
         || strcasecmp(item->u1.str,"exitwhile") == 0
         || strcasecmp(item->u1.str,"goto") == 0
         || strcasecmp(item->u1.str,"macro") == 0
         || strcasecmp(item->u1.str,"macroexclusive") == 0
         || strcasecmp(item->u1.str,"macroif") == 0
         || strcasecmp(item->u1.str,"stackpop") == 0
         || strcasecmp(item->u1.str,"execIf") == 0 ) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: application call to %s affects flow of control, and needs to be re-written using AEL if, while, goto, etc. keywords instead!\n",
               item->filename, item->startline, item->endline, item->u1.str);
         warns++;
      }
      if (strcasecmp(item->u1.str,"macroexit") == 0) {
            ast_log(LOG_WARNING, "Warning: file %s, line %d-%d: I am converting the MacroExit call here to a return statement.\n",
                  item->filename, item->startline, item->endline);
            item->type = PV_RETURN;
            free(item->u1.str);
            item->u1.str = 0;
      }
      
#ifdef AAL_ARGCHECK
      found = 0;
      for (app=apps; app; app=app->next) {
         if (strcasecmp(app->name, item->u1.str) == 0) {
            found =app;
            break;
         }
      }
      if (!found) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: application call to %s not listed in applist database!\n",
               item->filename, item->startline, item->endline, item->u1.str);
         warns++;
      } else
         check_app_args(item, item->u2.arglist, app);
#endif
      break;
      
   case PV_CASE:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      /* Make sure sequence of statements under case is terminated with  goto, return, or break */
      /* find the last statement */
      check_pval(item->u2.statements, apps,in_globals);
      break;
         
   case PV_PATTERN:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      /* Make sure sequence of statements under case is terminated with  goto, return, or break */
      /* find the last statement */
      
      check_pval(item->u2.statements, apps,in_globals);
      break;
         
   case PV_DEFAULT:
      /* fields: 
                 item->u2.statements == pval list of statements under the case
      */

      check_pval(item->u2.statements, apps,in_globals);
      break;
         
   case PV_CATCH:
      /* fields: item->u1.str     == name of extension to catch
                 item->u2.statements == pval list of statements in context body
      */
      check_pval(item->u2.statements, apps,in_globals);
      break;
         
   case PV_SWITCHES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      check_pval(item->u1.list, apps,in_globals);
      break;
         
   case PV_ESWITCHES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      check_pval(item->u1.list, apps,in_globals);
      break;
         
   case PV_INCLUDES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      check_pval(item->u1.list, apps,in_globals);
      check_includes(item);
      for (lp=item->u1.list; lp; lp=lp->next){
         char *incl_context = lp->u1.str;
         struct pval *that_context = find_context(incl_context);

         if ( lp->u2.arglist ) {
            check_timerange(lp->u2.arglist);
            check_dow(lp->u2.arglist->next);
            check_day(lp->u2.arglist->next->next);
            check_month(lp->u2.arglist->next->next->next);
         }
         
         if (that_context) {
            find_pval_gotos(that_context->u2.statements,0);
            
         }
      }
      break;
         
   case PV_STATEMENTBLOCK:
      /* fields: item->u1.list     == pval list of statements in block, one per entry in the list
      */
      check_pval(item->u1.list, apps,in_globals);
      break;
         
   case PV_VARDEC:
      /* fields: item->u1.str     == variable name
                 item->u2.val     == variable value to assign
      */
      /* the RHS of a vardec is encapsulated in a $[] expr. Is it legal? */
      if( !in_globals ) { /* don't check stuff inside the globals context; no wrapping in $[ ] there... */
         snprintf(errmsg,sizeof(errmsg), "file %s, line %d, columns %d-%d, variable declaration expr '%s':", item->filename, item->startline, item->startcol, item->endcol, item->u2.val);
         ast_expr_register_extra_error_info(errmsg);
         ast_expr(item->u2.val, expr_output, sizeof(expr_output),NULL);
         ast_expr_clear_extra_error_info();
         if ( strpbrk(item->u2.val,"~!-+<>=*/&^") && !strstr(item->u2.val,"${") ) {
            ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: expression %s has operators, but no variables. Interesting...\n",
                  item->filename, item->startline, item->endline, item->u2.val);
            warns++;
         }
         check_expr2_input(item,item->u2.val);
      }
      break;
         
   case PV_LOCALVARDEC:
      /* fields: item->u1.str     == variable name
                 item->u2.val     == variable value to assign
      */
      /* the RHS of a vardec is encapsulated in a $[] expr. Is it legal? */
      snprintf(errmsg,sizeof(errmsg), "file %s, line %d, columns %d-%d, variable declaration expr '%s':", item->filename, item->startline, item->startcol, item->endcol, item->u2.val);
      ast_expr_register_extra_error_info(errmsg);
      ast_expr(item->u2.val, expr_output, sizeof(expr_output),NULL);
      ast_expr_clear_extra_error_info();
      if ( strpbrk(item->u2.val,"~!-+<>=*/&^") && !strstr(item->u2.val,"${") ) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: expression %s has operators, but no variables. Interesting...\n",
               item->filename, item->startline, item->endline, item->u2.val);
         warns++;
      }
      check_expr2_input(item,item->u2.val);
      break;
         
   case PV_GOTO:
      /* fields: item->u1.list     == pval list of PV_WORD target names, up to 3, in order as given by user.
                 item->u1.list->u1.str  == where the data on a PV_WORD will always be.
      */
      /* don't check goto's in abstract contexts */
      if ( in_abstract_context )
         break;
      
      check_goto(item);
      break;
         
   case PV_LABEL:
      /* fields: item->u1.str     == label name
      */
      if ( strspn(item->u1.str, "0123456789") == strlen(item->u1.str) ) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: label '%s' is numeric, this is bad practice!\n",
               item->filename, item->startline, item->endline, item->u1.str);
         warns++;
      }

      check_label(item);
      break;
         
   case PV_FOR:
      /* fields: item->u1.for_init     == a string containing the initalizer
                 item->u2.for_test     == a string containing the loop test
                 item->u3.for_inc      == a string containing the loop increment

               item->u4.for_statements == a pval list of statements in the for ()
      */
      snprintf(errmsg,sizeof(errmsg),"file %s, line %d, columns %d-%d, for test expr '%s':", item->filename, item->startline, item->startcol, item->endcol, item->u2.for_test);
      ast_expr_register_extra_error_info(errmsg);

      strp = strchr(item->u1.for_init, '=');
      if (strp) {
         ast_expr(strp+1, expr_output, sizeof(expr_output),NULL);
      }
      ast_expr(item->u2.for_test, expr_output, sizeof(expr_output),NULL);
      strp = strchr(item->u3.for_inc, '=');
      if (strp) {
         ast_expr(strp+1, expr_output, sizeof(expr_output),NULL);
      }
      if ( strpbrk(item->u2.for_test,"~!-+<>=*/&^") && !strstr(item->u2.for_test,"${") ) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: expression %s has operators, but no variables. Interesting...\n",
               item->filename, item->startline, item->endline, item->u2.for_test);
         warns++;
      }
      if ( strpbrk(item->u3.for_inc,"~!-+<>=*/&^") && !strstr(item->u3.for_inc,"${") ) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: expression %s has operators, but no variables. Interesting...\n",
               item->filename, item->startline, item->endline, item->u3.for_inc);
         warns++;
      }
      check_expr2_input(item,item->u2.for_test);
      check_expr2_input(item,item->u3.for_inc);
      
      ast_expr_clear_extra_error_info();
      check_pval(item->u4.for_statements, apps,in_globals);
      break;
         
   case PV_WHILE:
      /* fields: item->u1.str        == the while conditional, as supplied by user

               item->u2.statements == a pval list of statements in the while ()
      */
      snprintf(errmsg,sizeof(errmsg),"file %s, line %d, columns %d-%d, while expr '%s':", item->filename, item->startline, item->startcol, item->endcol, item->u1.str);
      ast_expr_register_extra_error_info(errmsg);
      ast_expr(item->u1.str, expr_output, sizeof(expr_output),NULL);
      ast_expr_clear_extra_error_info();
      if ( strpbrk(item->u1.str,"~!-+<>=*/&^") && !strstr(item->u1.str,"${") ) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: expression %s has operators, but no variables. Interesting...\n",
               item->filename, item->startline, item->endline, item->u1.str);
         warns++;
      }
      check_expr2_input(item,item->u1.str);
      check_pval(item->u2.statements, apps,in_globals);
      break;
         
   case PV_BREAK:
      /* fields: none
      */
      check_break(item);
      break;
         
   case PV_RETURN:
      /* fields: none
      */
      break;
         
   case PV_CONTINUE:
      /* fields: none
      */
      check_continue(item);
      break;
         
   case PV_RANDOM:
      /* fields: item->u1.str        == the random number expression, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      snprintf(errmsg,sizeof(errmsg),"file %s, line %d, columns %d-%d, random expr '%s':", item->filename, item->startline, item->startcol, item->endcol, item->u1.str);
      ast_expr_register_extra_error_info(errmsg);
      ast_expr(item->u1.str, expr_output, sizeof(expr_output),NULL);
      ast_expr_clear_extra_error_info();
      if ( strpbrk(item->u1.str,"~!-+<>=*/&^") && !strstr(item->u1.str,"${") ) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: random expression '%s' has operators, but no variables. Interesting...\n",
               item->filename, item->startline, item->endline, item->u1.str);
         warns++;
      }
      check_expr2_input(item,item->u1.str);
      check_pval(item->u2.statements, apps,in_globals);
      if (item->u3.else_statements) {
         check_pval(item->u3.else_statements, apps,in_globals);
      }
      break;

   case PV_IFTIME:
      /* fields: item->u1.list        == the if time values, 4 of them, each in PV_WORD, linked list 

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      if ( item->u2.arglist ) {
         check_timerange(item->u1.list);
         check_dow(item->u1.list->next);
         check_day(item->u1.list->next->next);
         check_month(item->u1.list->next->next->next);
      }

      check_pval(item->u2.statements, apps,in_globals);
      if (item->u3.else_statements) {
         check_pval(item->u3.else_statements, apps,in_globals);
      }
      break;
         
   case PV_IF:
      /* fields: item->u1.str        == the if conditional, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      snprintf(errmsg,sizeof(errmsg),"file %s, line %d, columns %d-%d, if expr '%s':", item->filename, item->startline, item->startcol, item->endcol, item->u1.str);
      ast_expr_register_extra_error_info(errmsg);
      ast_expr(item->u1.str, expr_output, sizeof(expr_output),NULL);
      ast_expr_clear_extra_error_info();
      if ( strpbrk(item->u1.str,"~!-+<>=*/&^") && !strstr(item->u1.str,"${") ) {
         ast_log(LOG_WARNING,"Warning: file %s, line %d-%d: expression '%s' has operators, but no variables. Interesting...\n",
               item->filename, item->startline, item->endline, item->u1.str);
         warns++;
      }
      check_expr2_input(item,item->u1.str);
      check_pval(item->u2.statements, apps,in_globals);
      if (item->u3.else_statements) {
         check_pval(item->u3.else_statements, apps,in_globals);
      }
      break;
         
   case PV_SWITCH:
      /* fields: item->u1.str        == the switch expression

               item->u2.statements == a pval list of statements in the switch, 
                                    (will be case statements, most likely!)
      */
      /* we can check the switch expression, see if it matches any of the app variables...
           if it does, then, are all the possible cases accounted for? */
      check_switch_expr(item, apps);
      check_pval(item->u2.statements, apps,in_globals);
      break;
         
   case PV_EXTENSION:
      /* fields: item->u1.str        == the extension name, label, whatever it's called

               item->u2.statements == a pval list of statements in the extension
               item->u3.hints      == a char * hint argument
               item->u4.regexten   == an int boolean. non-zero says that regexten was specified
      */
      current_extension = item ;
      
      check_pval(item->u2.statements, apps,in_globals);
      break;
         
   case PV_IGNOREPAT:
      /* fields: item->u1.str        == the ignorepat data
      */
      break;
         
   case PV_GLOBALS:
      /* fields: item->u1.statements     == pval list of statements, usually vardecs
      */
      in_abstract_context = 0;
      check_pval(item->u1.statements, apps, 1);
      break;
   default:
      break;
   }
}

void check_pval(pval *item, struct argapp *apps, int in_globals)
{
   pval *i;

   /* checks to do:
      1. Do goto's point to actual labels? 
      2. Do macro calls reference a macro?
      3. Does the number of macro args match the definition?
      4. Is a macro call missing its & at the front?
      5. Application calls-- we could check syntax for existing applications,
         but I need some some sort of universal description bnf for a general
        sort of method for checking arguments, in number, maybe even type, at least. 
        Don't want to hand code checks for hundreds of applications.
   */
   
   for (i=item; i; i=i->next) {
      check_pval_item(i,apps,in_globals);
   }
}

void ael2_semantic_check(pval *item, int *arg_errs, int *arg_warns, int *arg_notes)
{
   
#ifdef AAL_ARGCHECK
   int argapp_errs =0;
   char *rfilename;
#endif
   struct argapp *apps=0;

   if (!item)
      return; /* don't check an empty tree */
#ifdef AAL_ARGCHECK
   rfilename = alloca(10 + strlen(ast_config_AST_VAR_DIR));
   sprintf(rfilename, "%s/applist", ast_config_AST_VAR_DIR);
   
   apps = argdesc_parse(rfilename, &argapp_errs); /* giveth */
#endif
   current_db = item;
   errs = warns = notes = 0;

   check_context_names();
   check_pval(item, apps, 0);

#ifdef AAL_ARGCHECK
   argdesc_destroy(apps);  /* taketh away */
#endif
   current_db = 0;

   *arg_errs = errs;
   *arg_warns = warns;
   *arg_notes = notes;
}

/* =============================================================================================== */
/* "CODE" GENERATOR -- Convert the AEL representation to asterisk extension language */
/* =============================================================================================== */

static int control_statement_count = 0;

struct ael_priority *new_prio(void)
{
   struct ael_priority *x = (struct ael_priority *)calloc(sizeof(struct ael_priority),1);
   return x;
}

struct ael_extension *new_exten(void)
{
   struct ael_extension *x = (struct ael_extension *)calloc(sizeof(struct ael_extension),1);
   return x;
}

void linkprio(struct ael_extension *exten, struct ael_priority *prio, struct ael_extension *mother_exten)
{
   char *p1, *p2;
   
   if (!exten->plist) {
      exten->plist = prio;
      exten->plist_last = prio;
   } else {
      exten->plist_last->next = prio;
      exten->plist_last = prio;
   }
   if( !prio->exten )
      prio->exten = exten; /* don't override the switch value */
   /* The following code will cause all priorities within an extension 
      to have ${EXTEN} or ${EXTEN: replaced with ~~EXTEN~~, which is
      set just before the first switch in an exten. The switches
      will muck up the original ${EXTEN} value, so we save it away
      and the user accesses this copy instead. */
   if (prio->appargs && ((mother_exten && mother_exten->has_switch) || exten->has_switch) ) {
      while ((p1 = strstr(prio->appargs, "${EXTEN}"))) {
         p2 = malloc(strlen(prio->appargs)+5);
         *p1 = 0;
         strcpy(p2, prio->appargs);
         strcat(p2, "${~~EXTEN~~}");
         if (*(p1+8))
            strcat(p2, p1+8);
         free(prio->appargs);
         prio->appargs = p2;
      }
      while ((p1 = strstr(prio->appargs, "${EXTEN:"))) {
         p2 = malloc(strlen(prio->appargs)+5);
         *p1 = 0;
         strcpy(p2, prio->appargs);
         strcat(p2, "${~~EXTEN~~:");
         if (*(p1+8))
            strcat(p2, p1+8);
         free(prio->appargs);
         prio->appargs = p2;
      }
   }
}

void destroy_extensions(struct ael_extension *exten)
{
   struct ael_extension *ne, *nen;
   for (ne=exten; ne; ne=nen) {
      struct ael_priority *pe, *pen;
      
      if (ne->name)
         free(ne->name);
      
      /* cidmatch fields are allocated with name, and freed when
         the name field is freed. Don't do a free for this field,
         unless you LIKE to see a crash! */

      if (ne->hints)
         free(ne->hints);
      
      for (pe=ne->plist; pe; pe=pen) {
         pen = pe->next;
         if (pe->app)
            free(pe->app);
         pe->app = 0;
         if (pe->appargs)
            free(pe->appargs);
         pe->appargs = 0;
         pe->origin = 0;
         pe->goto_true = 0;
         pe->goto_false = 0;
         free(pe);
      }
      nen = ne->next_exten;
      ne->next_exten = 0;
      ne->plist =0;
      ne->plist_last = 0;
      ne->next_exten = 0;
      ne->loop_break = 0;
      ne->loop_continue = 0;
      free(ne);
   }
}

static int label_inside_case(pval *label)
{
   pval *p = label;
   
   while( p && p->type != PV_MACRO && p->type != PV_CONTEXT ) /* early cutout, sort of */ {
      if( p->type == PV_CASE || p->type == PV_DEFAULT || p->type == PV_PATTERN ) {
         return 1;
      }

      p = p->dad;
   }
   return 0;
}

static void linkexten(struct ael_extension *exten, struct ael_extension *add)
{
   add->next_exten = exten->next_exten; /* this will reverse the order. Big deal. */
   exten->next_exten = add;
}

static void remove_spaces_before_equals(char *str)
{
   char *p;
   while( str && *str && *str != '=' )
   {
      if( *str == ' ' || *str == '\n' || *str == '\r' || *str == '\t' )
      {
         p = str;
         while( *p )
         {
            *p = *(p+1);
            p++;
         }
      }
      else
         str++;
   }
}

/* =============================================================================================== */
/* "CODE" GENERATOR -- Convert the AEL representation to asterisk extension language */
/* =============================================================================================== */

static void gen_match_to_pattern(char *pattern, char *result)
{
   /* the result will be a string that will be matched by pattern */
   char *p=pattern, *t=result;
   while (*p) {
      if (*p == 'x' || *p == 'n' || *p == 'z' || *p == 'X' || *p == 'N' || *p == 'Z')
         *t++ = '9';
      else if (*p == '[') {
         char *z = p+1;
         while (*z != ']')
            z++;
         if (*(z+1)== ']')
            z++;
         *t++=*(p+1); /* use the first char in the set */
         p = z;
      } else {
         *t++ = *p;
      }
      p++;
   }
   *t++ = 0; /* cap it off */
}

/* ==== a set of routines to search for a switch statement contained in the pval description */

int find_switch_item(pval *item);
int contains_switch(pval *item);


int find_switch_item(pval *item)
{
   switch ( item->type ) {
   case PV_LOCALVARDEC:
      /* fields: item->u1.str == string associated with this (word). */
      break;
      
   case PV_WORD:
      /* fields: item->u1.str == string associated with this (word). */
      break;
      
   case PV_MACRO:
      /* fields: item->u1.str     == name of macro
                 item->u2.arglist == pval list of PV_WORD arguments of macro, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg

               item->u3.macro_statements == pval list of statements in macro body.
      */
      /* had better not see this */
      if (contains_switch(item->u3.macro_statements))
         return 1;
      break;
         
   case PV_CONTEXT:
      /* fields: item->u1.str     == name of context
                 item->u2.statements == pval list of statements in context body
               item->u3.abstract == int 1 if an abstract keyword were present
      */
      /* had better not see this */
      if (contains_switch(item->u2.statements))
         return 1;
      break;
         
   case PV_MACRO_CALL:
      /* fields: item->u1.str     == name of macro to call
                 item->u2.arglist == pval list of PV_WORD arguments of macro call, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg
      */
      break;
         
   case PV_APPLICATION_CALL:
      /* fields: item->u1.str     == name of application to call
                 item->u2.arglist == pval list of PV_WORD arguments of macro call, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg
      */
      break;
         
   case PV_CASE:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      /* had better not see this */
      if (contains_switch(item->u2.statements))
         return 1;
      break;
         
   case PV_PATTERN:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      /* had better not see this */
      if (contains_switch(item->u2.statements))
         return 1;
      break;
         
   case PV_DEFAULT:
      /* fields: 
                 item->u2.statements == pval list of statements under the case
      */
      /* had better not see this */
      if (contains_switch(item->u2.statements))
         return 1;
      break;
         
   case PV_CATCH:
      /* fields: item->u1.str     == name of extension to catch
                 item->u2.statements == pval list of statements in context body
      */
      /* had better not see this */
      if (contains_switch(item->u2.statements))
         return 1;
      break;
         
   case PV_SWITCHES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      break;
         
   case PV_ESWITCHES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      break;
         
   case PV_INCLUDES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
                 item->u2.arglist  == pval list of 4 PV_WORD elements for time values
      */
      break;
         
   case PV_STATEMENTBLOCK:
      /* fields: item->u1.list     == pval list of statements in block, one per entry in the list
      */
      if (contains_switch(item->u1.list) )
         return 1;
      break;
         
   case PV_VARDEC:
      /* fields: item->u1.str     == variable name
                 item->u2.val     == variable value to assign
      */
      break;
         
   case PV_GOTO:
      /* fields: item->u1.list     == pval list of PV_WORD target names, up to 3, in order as given by user.
                 item->u1.list->u1.str  == where the data on a PV_WORD will always be.
      */
      break;
         
   case PV_LABEL:
      /* fields: item->u1.str     == label name
      */
      break;
         
   case PV_FOR:
      /* fields: item->u1.for_init     == a string containing the initalizer
                 item->u2.for_test     == a string containing the loop test
                 item->u3.for_inc      == a string containing the loop increment

               item->u4.for_statements == a pval list of statements in the for ()
      */
      if (contains_switch(item->u4.for_statements))
         return 1;
      break;
         
   case PV_WHILE:
      /* fields: item->u1.str        == the while conditional, as supplied by user

               item->u2.statements == a pval list of statements in the while ()
      */
      if (contains_switch(item->u2.statements))
         return 1;
      break;
         
   case PV_BREAK:
      /* fields: none
      */
      break;
         
   case PV_RETURN:
      /* fields: none
      */
      break;
         
   case PV_CONTINUE:
      /* fields: none
      */
      break;
         
   case PV_IFTIME:
      /* fields: item->u1.list        == there are 4 linked PV_WORDs here.

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      if (contains_switch(item->u2.statements))
         return 1;
      if ( item->u3.else_statements ) {
         if (contains_switch(item->u3.else_statements))
            return 1;
      }
      break;
         
   case PV_RANDOM:
      /* fields: item->u1.str        == the random number expression, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      if (contains_switch(item->u2.statements))
         return 1;
      if ( item->u3.else_statements ) {
         if (contains_switch(item->u3.else_statements))
            return 1;
      }
      break;
         
   case PV_IF:
      /* fields: item->u1.str        == the if conditional, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      if (contains_switch(item->u2.statements))
         return 1;
      if ( item->u3.else_statements ) {
         if (contains_switch(item->u3.else_statements))
            return 1;
      }
      break;
         
   case PV_SWITCH:
      /* fields: item->u1.str        == the switch expression

               item->u2.statements == a pval list of statements in the switch, 
                                    (will be case statements, most likely!)
      */
      return 1; /* JACKPOT */
      break;
         
   case PV_EXTENSION:
      /* fields: item->u1.str        == the extension name, label, whatever it's called

               item->u2.statements == a pval list of statements in the extension
               item->u3.hints      == a char * hint argument
               item->u4.regexten   == an int boolean. non-zero says that regexten was specified
      */
      if (contains_switch(item->u2.statements))
         return 1;
      break;
         
   case PV_IGNOREPAT:
      /* fields: item->u1.str        == the ignorepat data
      */
      break;
         
   case PV_GLOBALS:
      /* fields: item->u1.statements     == pval list of statements, usually vardecs
      */
      break;
   }
   return 0;
}

int contains_switch(pval *item)
{
   pval *i;
   
   for (i=item; i; i=i->next) {
      if (find_switch_item(i))
         return 1;
   }
   return 0;
}


static int gen_prios(struct ael_extension *exten, char *label, pval *statement, struct ael_extension *mother_exten, struct ast_context *this_context )
{
   pval *p,*p2,*p3;
   struct ael_priority *pr;
   struct ael_priority *for_init, *for_test, *for_inc, *for_loop, *for_end;
   struct ael_priority *while_test, *while_loop, *while_end;
   struct ael_priority *switch_set, *switch_test, *switch_end, *fall_thru, *switch_empty;
   struct ael_priority *if_test, *if_end, *if_skip, *if_false;
#ifdef OLD_RAND_ACTION
   struct ael_priority *rand_test, *rand_end, *rand_skip;
#endif
   char *buf1;
   char *buf2;
   char *new_label;
   char *strp, *strp2;
   int default_exists;
   int local_control_statement_count;
   int first;
   struct ael_priority *loop_break_save;
   struct ael_priority *loop_continue_save;
   struct ael_extension *switch_case,*switch_null;

   if (!(buf1 = malloc(BUF_SIZE))) {
      return -1;
   }
   if (!(buf2 = malloc(BUF_SIZE))) {
      return -1;
   }
   if (!(new_label = malloc(BUF_SIZE))) {
      return -1;
   }
   
   if ((mother_exten && !mother_exten->checked_switch) || (exten && !exten->checked_switch)) {
      if (contains_switch(statement)) { /* only run contains_switch if you haven't checked before */
         if (mother_exten) {
            if (!mother_exten->has_switch) {
               for (first = 1; first >= 0; first--) {
                  switch_set = new_prio();
                  switch_set->type = AEL_APPCALL;
                  if (!ast_compat_app_set) {
                     switch_set->app = strdup("MSet");
                  } else {
                     switch_set->app = strdup("Set");
                  }
                  /* Are we likely inside a gosub subroutine? */
                  if (!strcmp(mother_exten->name, "~~s~~") && first) {
                     /* If we're not actually within a gosub, this will fail, but the
                      * second time through, it will get set.  If we are within gosub,
                      * the second time through is redundant, but acceptable. */
                     switch_set->appargs = strdup("LOCAL(~~EXTEN~~)=${EXTEN}");
                  } else {
                     switch_set->appargs = strdup("~~EXTEN~~=${EXTEN}");
                     first = 0;
                  }
                  linkprio(exten, switch_set, mother_exten);
                  mother_exten->has_switch = 1;
                  mother_exten->checked_switch = 1;
                  if (exten) {
                     exten->has_switch = 1;
                     exten->checked_switch = 1;
                  }
               }
            }
         } else if (exten) {
            if (!exten->has_switch) {
               for (first = 1; first >= 0; first--) {
                  switch_set = new_prio();
                  switch_set->type = AEL_APPCALL;
                  if (!ast_compat_app_set) {
                     switch_set->app = strdup("MSet");
                  } else {
                     switch_set->app = strdup("Set");
                  }
                  /* Are we likely inside a gosub subroutine? */
                  if (!strcmp(exten->name, "~~s~~")) {
                     /* If we're not actually within a gosub, this will fail, but the
                      * second time through, it will get set.  If we are within gosub,
                      * the second time through is redundant, but acceptable. */
                     switch_set->appargs = strdup("LOCAL(~~EXTEN~~)=${EXTEN}");
                  } else {
                     switch_set->appargs = strdup("~~EXTEN~~=${EXTEN}");
                     first = 0;
                  }
                  linkprio(exten, switch_set, mother_exten);
                  exten->has_switch = 1;
                  exten->checked_switch = 1;
                  if (mother_exten) {
                     mother_exten->has_switch = 1;
                     mother_exten->checked_switch = 1;
                  }
               }
            }
         }
      } else {
         if (mother_exten) {
            mother_exten->checked_switch = 1;
         }
         if (exten) {
            exten->checked_switch = 1;
         }
      }
   }
   for (p=statement; p; p=p->next) {
      switch (p->type) {
      case PV_VARDEC:
         pr = new_prio();
         pr->type = AEL_APPCALL;
         snprintf(buf1, BUF_SIZE, "%s=$[%s]", p->u1.str, p->u2.val);
         if (!ast_compat_app_set) {
            pr->app = strdup("MSet");
         } else {
            pr->app = strdup("Set");
         }
         remove_spaces_before_equals(buf1);
         pr->appargs = strdup(buf1);
         pr->origin = p;
         linkprio(exten, pr, mother_exten);
         break;

      case PV_LOCALVARDEC:
         pr = new_prio();
         pr->type = AEL_APPCALL;
         snprintf(buf1, BUF_SIZE, "LOCAL(%s)=$[%s]", p->u1.str, p->u2.val);
         if (!ast_compat_app_set) {
            pr->app = strdup("MSet");
         } else {
            pr->app = strdup("Set");
         }
         remove_spaces_before_equals(buf1);
         pr->appargs = strdup(buf1);
         pr->origin = p;
         linkprio(exten, pr, mother_exten);
         break;
         
      case PV_GOTO:
         pr = new_prio();
         pr->type = AEL_APPCALL;
         p->u2.goto_target = get_goto_target(p);
         if( p->u2.goto_target ) {
            p->u3.goto_target_in_case = label_inside_case(p->u2.goto_target);
         }
         
         if (!p->u1.list->next) /* just one */ {
            pr->app = strdup("Goto");
            if (!mother_exten)
               pr->appargs = strdup(p->u1.list->u1.str);
            else {  /* for the case of simple within-extension gotos in case/pattern/default statement blocks: */ 
               snprintf(buf1, BUF_SIZE, "%s,%s", mother_exten->name, p->u1.list->u1.str);
               pr->appargs = strdup(buf1);
            }
            
         } else if (p->u1.list->next && !p->u1.list->next->next) /* two */ {
            snprintf(buf1, BUF_SIZE, "%s,%s", p->u1.list->u1.str, p->u1.list->next->u1.str);
            pr->app = strdup("Goto");
            pr->appargs = strdup(buf1);
         } else if (p->u1.list->next && p->u1.list->next->next) {
            snprintf(buf1, BUF_SIZE, "%s,%s,%s", p->u1.list->u1.str, 
                  p->u1.list->next->u1.str,
                  p->u1.list->next->next->u1.str);
            pr->app = strdup("Goto");
            pr->appargs = strdup(buf1);
         }
         pr->origin = p;
         linkprio(exten, pr, mother_exten);
         break;

      case PV_LABEL:
         pr = new_prio();
         pr->type = AEL_LABEL;
         pr->origin = p;
         p->u3.compiled_label = exten;
         linkprio(exten, pr, mother_exten);
         break;

      case PV_FOR:
         control_statement_count++;
         loop_break_save = exten->loop_break; /* save them, then restore before leaving */
         loop_continue_save = exten->loop_continue;
         snprintf(new_label, BUF_SIZE, "for_%s_%d", label, control_statement_count);
         for_init = new_prio();
         for_inc = new_prio();
         for_test = new_prio();
         for_loop = new_prio();
         for_end = new_prio();
         for_init->type = AEL_APPCALL;
         for_inc->type = AEL_APPCALL;
         for_test->type = AEL_FOR_CONTROL;
         for_test->goto_false = for_end;
         for_loop->type = AEL_CONTROL1; /* simple goto */
         for_end->type = AEL_APPCALL;
         if (!ast_compat_app_set) {
            for_init->app = strdup("MSet");
         } else {
            for_init->app = strdup("Set");
         }
         
         strcpy(buf2,p->u1.for_init);
         remove_spaces_before_equals(buf2);
         strp = strchr(buf2, '=');
         if (strp) {
            strp2 = strchr(p->u1.for_init, '=');
            *(strp+1) = 0;
            strcat(buf2,"$[");
            strncat(buf2,strp2+1, BUF_SIZE-strlen(strp2+1)-2);
            strcat(buf2,"]");
            for_init->appargs = strdup(buf2);
         } else {
            strp2 = p->u1.for_init;
            while (*strp2 && isspace(*strp2))
               strp2++;
            if (*strp2 == '&') { /* itsa macro call */
               char *strp3 = strp2+1;
               while (*strp3 && isspace(*strp3))
                  strp3++;
               strcpy(buf2, strp3);
               strp3 = strchr(buf2,'(');
               if (strp3) {
                  *strp3 = '|';
               }
               while ((strp3=strchr(buf2,','))) {
                  *strp3 = '|';
               }
               strp3 = strrchr(buf2, ')');
               if (strp3)
                  *strp3 = 0; /* remove the closing paren */

               for_init->appargs = strdup(buf2);
               free(for_init->app);
               for_init->app = strdup("Macro");
            } else {  /* must be a regular app call */
               char *strp3;
               strcpy(buf2, strp2);
               strp3 = strchr(buf2,'(');
               if (strp3) {
                  *strp3 = 0;
                  free(for_init->app);
                  for_init->app = strdup(buf2);
                  for_init->appargs = strdup(strp3+1);
                  strp3 = strrchr(for_init->appargs, ')');
                  if (strp3)
                     *strp3 = 0; /* remove the closing paren */
               }
            }
         }

         strcpy(buf2,p->u3.for_inc);
         remove_spaces_before_equals(buf2);
         strp = strchr(buf2, '=');
         if (strp) {  /* there's an = in this part; that means an assignment. set it up */
            strp2 = strchr(p->u3.for_inc, '=');
            *(strp+1) = 0;
            strcat(buf2,"$[");
            strncat(buf2,strp2+1, BUF_SIZE-strlen(strp2+1)-2);
            strcat(buf2,"]");
            for_inc->appargs = strdup(buf2);
            if (!ast_compat_app_set) {
               for_inc->app = strdup("MSet");
            } else {
               for_inc->app = strdup("Set");
            }
         } else {
            strp2 = p->u3.for_inc;
            while (*strp2 && isspace(*strp2))
               strp2++;
            if (*strp2 == '&') { /* itsa macro call  */
               char *strp3 = strp2+1;
               while (*strp3 && isspace(*strp3))
                  strp3++;
               strcpy(buf2, strp3);
               strp3 = strchr(buf2,'(');
               if (strp3) {
                  *strp3 = ',';
               }
               strp3 = strrchr(buf2, ')');
               if (strp3)
                  *strp3 = 0; /* remove the closing paren */

               for_inc->appargs = strdup(buf2);

               for_inc->app = strdup("Macro");
            } else {  /* must be a regular app call */
               char *strp3;
               strcpy(buf2, strp2);
               strp3 = strchr(buf2,'(');
               if (strp3) {
                  *strp3 = 0;
                  for_inc->app = strdup(buf2);
                  for_inc->appargs = strdup(strp3+1);
                  strp3 = strrchr(for_inc->appargs, ')');
                  if (strp3)
                     *strp3 = 0; /* remove the closing paren */
               }
            }
         }
         snprintf(buf1, BUF_SIZE, "$[%s]",p->u2.for_test);
         for_test->app = 0;
         for_test->appargs = strdup(buf1);
         for_loop->goto_true = for_test;
         snprintf(buf1, BUF_SIZE, "Finish for_%s_%d", label, control_statement_count);
         for_end->app = strdup("NoOp");
         for_end->appargs = strdup(buf1);
         /* link & load! */
         linkprio(exten, for_init, mother_exten);
         linkprio(exten, for_test, mother_exten);
         
         /* now, put the body of the for loop here */
         exten->loop_break = for_end;
         exten->loop_continue = for_inc;
         
         if (gen_prios(exten, new_label, p->u4.for_statements, mother_exten, this_context)) { /* this will link in all the statements here */
            return -1;
         }
         
         linkprio(exten, for_inc, mother_exten);
         linkprio(exten, for_loop, mother_exten);
         linkprio(exten, for_end, mother_exten);
         
         
         exten->loop_break = loop_break_save;
         exten->loop_continue = loop_continue_save;
         for_loop->origin = p;
         break;

      case PV_WHILE:
         control_statement_count++;
         loop_break_save = exten->loop_break; /* save them, then restore before leaving */
         loop_continue_save = exten->loop_continue;
         snprintf(new_label, BUF_SIZE, "while_%s_%d", label, control_statement_count);
         while_test = new_prio();
         while_loop = new_prio();
         while_end = new_prio();
         while_test->type = AEL_FOR_CONTROL;
         while_test->goto_false = while_end;
         while_loop->type = AEL_CONTROL1; /* simple goto */
         while_end->type = AEL_APPCALL;
         snprintf(buf1, BUF_SIZE, "$[%s]",p->u1.str);
         while_test->app = 0;
         while_test->appargs = strdup(buf1);
         while_loop->goto_true = while_test;
         snprintf(buf1, BUF_SIZE, "Finish while_%s_%d", label, control_statement_count);
         while_end->app = strdup("NoOp");
         while_end->appargs = strdup(buf1);

         linkprio(exten, while_test, mother_exten);
         
         /* now, put the body of the for loop here */
         exten->loop_break = while_end;
         exten->loop_continue = while_test;
         
         if (gen_prios(exten, new_label, p->u2.statements, mother_exten, this_context)) { /* this will link in all the while body statements here */
            return -1;
         }

         linkprio(exten, while_loop, mother_exten);
         linkprio(exten, while_end, mother_exten);
         
         
         exten->loop_break = loop_break_save;
         exten->loop_continue = loop_continue_save;
         while_loop->origin = p;
         break;

      case PV_SWITCH:
         control_statement_count++;
         local_control_statement_count = control_statement_count;
         loop_break_save = exten->loop_break; /* save them, then restore before leaving */
         loop_continue_save = exten->loop_continue;
         snprintf(new_label, BUF_SIZE, "sw_%s_%d", label, control_statement_count);
         switch_test = new_prio();
         switch_end = new_prio();
         switch_test->type = AEL_APPCALL;
         switch_end->type = AEL_APPCALL;
         snprintf(buf1, BUF_SIZE, "sw_%d_%s,10", control_statement_count, p->u1.str);
         switch_test->app = strdup("Goto");
         switch_test->appargs = strdup(buf1);
         snprintf(buf1, BUF_SIZE, "Finish switch_%s_%d", label, control_statement_count);
         switch_end->app = strdup("NoOp");
         switch_end->appargs = strdup(buf1);
         switch_end->origin = p;
         switch_end->exten = exten;

         linkprio(exten, switch_test, mother_exten);
         linkprio(exten, switch_end, mother_exten);
         
         exten->loop_break = switch_end;
         exten->loop_continue = 0;
         default_exists = 0;
         
         for (p2=p->u2.statements; p2; p2=p2->next) {
            /* now, for each case/default put the body of the for loop here */
            if (p2->type == PV_CASE) {
               /* ok, generate a extension and link it in */
               switch_case = new_exten();
               if (mother_exten && mother_exten->checked_switch) {
                  switch_case->has_switch = mother_exten->has_switch;
                  switch_case->checked_switch = mother_exten->checked_switch;
               }
               if (exten && exten->checked_switch) {
                  switch_case->has_switch = exten->has_switch;
                  switch_case->checked_switch = exten->checked_switch;
               }
               switch_case->context = this_context;
               switch_case->is_switch = 1;
               /* the break/continue locations are inherited from parent */
               switch_case->loop_break = exten->loop_break;
               switch_case->loop_continue = exten->loop_continue;
               
               linkexten(exten,switch_case);
               snprintf(buf1, BUF_SIZE, "sw_%d_%s", local_control_statement_count, p2->u1.str);
               switch_case->name = strdup(buf1);
               snprintf(new_label, BUF_SIZE, "sw_%s_%s_%d", label, p2->u1.str, local_control_statement_count);
               
               if (gen_prios(switch_case, new_label, p2->u2.statements, exten, this_context)) { /* this will link in all the case body statements here */
                  return -1;
               }

               /* here is where we write code to "fall thru" to the next case... if there is one... */
               for (p3=p2->u2.statements; p3; p3=p3->next) {
                  if (!p3->next)
                     break;
               }
               /* p3 now points the last statement... */
               if (!p3 || ( p3->type != PV_GOTO && p3->type != PV_BREAK && p3->type != PV_RETURN) ) {
                  /* is there a following CASE/PATTERN/DEFAULT? */
                  if (p2->next && p2->next->type == PV_CASE) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_APPCALL;
                     fall_thru->app = strdup("Goto");
                     snprintf(buf1, BUF_SIZE, "sw_%d_%s,10", local_control_statement_count, p2->next->u1.str);
                     fall_thru->appargs = strdup(buf1);
                     linkprio(switch_case, fall_thru, mother_exten);
                  } else if (p2->next && p2->next->type == PV_PATTERN) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_APPCALL;
                     fall_thru->app = strdup("Goto");
                     gen_match_to_pattern(p2->next->u1.str, buf2);
                     snprintf(buf1, BUF_SIZE, "sw_%d_%s,10", local_control_statement_count, buf2);
                     fall_thru->appargs = strdup(buf1);
                     linkprio(switch_case, fall_thru, mother_exten);
                  } else if (p2->next && p2->next->type == PV_DEFAULT) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_APPCALL;
                     fall_thru->app = strdup("Goto");
                     snprintf(buf1, BUF_SIZE, "sw_%d_.,10", local_control_statement_count);
                     fall_thru->appargs = strdup(buf1);
                     linkprio(switch_case, fall_thru, mother_exten);
                  } else if (!p2->next) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_CONTROL1;
                     fall_thru->goto_true = switch_end;
                     fall_thru->app = strdup("Goto");
                     linkprio(switch_case, fall_thru, mother_exten);
                  }
               }
               if (switch_case->return_needed) { /* returns don't generate a goto eoe (end of extension) any more, just a Return() app call) */
                  char buf[2000];
                  struct ael_priority *np2 = new_prio();
                  np2->type = AEL_APPCALL;
                  np2->app = strdup("NoOp");
                  snprintf(buf, BUF_SIZE, "End of Extension %s", switch_case->name);
                  np2->appargs = strdup(buf);
                  linkprio(switch_case, np2, mother_exten);
                  switch_case-> return_target = np2;
               }
            } else if (p2->type == PV_PATTERN) {
               /* ok, generate a extension and link it in */
               switch_case = new_exten();
               if (mother_exten && mother_exten->checked_switch) {
                  switch_case->has_switch = mother_exten->has_switch;
                  switch_case->checked_switch = mother_exten->checked_switch;
               }
               if (exten && exten->checked_switch) {
                  switch_case->has_switch = exten->has_switch;
                  switch_case->checked_switch = exten->checked_switch;
               }
               switch_case->context = this_context;
               switch_case->is_switch = 1;
               /* the break/continue locations are inherited from parent */
               switch_case->loop_break = exten->loop_break;
               switch_case->loop_continue = exten->loop_continue;

               linkexten(exten,switch_case);
               snprintf(buf1, BUF_SIZE, "_sw_%d_%s", local_control_statement_count, p2->u1.str);
               switch_case->name = strdup(buf1);
               snprintf(new_label, BUF_SIZE, "sw_%s_%s_%d", label, p2->u1.str, local_control_statement_count);

               if (gen_prios(switch_case, new_label, p2->u2.statements, exten, this_context)) { /* this will link in all the while body statements here */
                  return -1;
               }
               /* here is where we write code to "fall thru" to the next case... if there is one... */
               for (p3=p2->u2.statements; p3; p3=p3->next) {
                  if (!p3->next)
                     break;
               }
               /* p3 now points the last statement... */
               if (!p3 || ( p3->type != PV_GOTO && p3->type != PV_BREAK && p3->type != PV_RETURN)) {
                  /* is there a following CASE/PATTERN/DEFAULT? */
                  if (p2->next && p2->next->type == PV_CASE) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_APPCALL;
                     fall_thru->app = strdup("Goto");
                     snprintf(buf1, BUF_SIZE, "sw_%d_%s,10", local_control_statement_count, p2->next->u1.str);
                     fall_thru->appargs = strdup(buf1);
                     linkprio(switch_case, fall_thru, mother_exten);
                  } else if (p2->next && p2->next->type == PV_PATTERN) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_APPCALL;
                     fall_thru->app = strdup("Goto");
                     gen_match_to_pattern(p2->next->u1.str, buf2);
                     snprintf(buf1, BUF_SIZE, "sw_%d_%s,10", local_control_statement_count, buf2);
                     fall_thru->appargs = strdup(buf1);
                     linkprio(switch_case, fall_thru, mother_exten);
                  } else if (p2->next && p2->next->type == PV_DEFAULT) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_APPCALL;
                     fall_thru->app = strdup("Goto");
                     snprintf(buf1, BUF_SIZE, "sw_%d_.,10", local_control_statement_count);
                     fall_thru->appargs = strdup(buf1);
                     linkprio(switch_case, fall_thru, mother_exten);
                  } else if (!p2->next) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_CONTROL1;
                     fall_thru->goto_true = switch_end;
                     fall_thru->app = strdup("Goto");
                     linkprio(switch_case, fall_thru, mother_exten);
                  }
               }
               if (switch_case->return_needed) { /* returns don't generate a goto eoe (end of extension) any more, just a Return() app call) */
                  char buf[2000];
                  struct ael_priority *np2 = new_prio();
                  np2->type = AEL_APPCALL;
                  np2->app = strdup("NoOp");
                  snprintf(buf,sizeof(buf),"End of Extension %s", switch_case->name);
                  np2->appargs = strdup(buf);
                  linkprio(switch_case, np2, mother_exten);
                  switch_case-> return_target = np2;
               }
            } else if (p2->type == PV_DEFAULT) {
               /* ok, generate a extension and link it in */
               switch_case = new_exten();
               if (mother_exten && mother_exten->checked_switch) {
                  switch_case->has_switch = mother_exten->has_switch;
                  switch_case->checked_switch = mother_exten->checked_switch;
               }
               if (exten && exten->checked_switch) {
                  switch_case->has_switch = exten->has_switch;
                  switch_case->checked_switch = exten->checked_switch;
               }
               switch_case->context = this_context;
               switch_case->is_switch = 1;
               
               /* new: the default case intros a pattern with ., which covers ALMOST everything.
                  but it doesn't cover a NULL pattern. So, we'll define a null extension to match
                  that goto's the default extension. */

               default_exists++;
               switch_null = new_exten();
               if (mother_exten && mother_exten->checked_switch) {
                  switch_null->has_switch = mother_exten->has_switch;
                  switch_null->checked_switch = mother_exten->checked_switch;
               }
               if (exten && exten->checked_switch) {
                  switch_null->has_switch = exten->has_switch;
                  switch_null->checked_switch = exten->checked_switch;
               }
               switch_null->context = this_context;
               switch_null->is_switch = 1;
               switch_empty = new_prio();
               snprintf(buf1, BUF_SIZE, "sw_%d_.,10", local_control_statement_count);
               switch_empty->app = strdup("Goto");
               switch_empty->appargs = strdup(buf1);
               linkprio(switch_null, switch_empty, mother_exten);
               snprintf(buf1, BUF_SIZE, "sw_%d_", local_control_statement_count);
               switch_null->name = strdup(buf1);
               switch_null->loop_break = exten->loop_break;
               switch_null->loop_continue = exten->loop_continue;
               linkexten(exten,switch_null);

               /* the break/continue locations are inherited from parent */
               switch_case->loop_break = exten->loop_break;
               switch_case->loop_continue = exten->loop_continue;
               linkexten(exten,switch_case);
               snprintf(buf1, BUF_SIZE, "_sw_%d_.", local_control_statement_count);
               switch_case->name = strdup(buf1);
               
               snprintf(new_label, BUF_SIZE, "sw_%s_default_%d", label, local_control_statement_count);
               
               if (gen_prios(switch_case, new_label, p2->u2.statements, exten, this_context)) { /* this will link in all the default:  body statements here */
                  return -1;
               }
               
               /* here is where we write code to "fall thru" to the next case... if there is one... */
               for (p3=p2->u2.statements; p3; p3=p3->next) {
                  if (!p3->next)
                     break;
               }
               /* p3 now points the last statement... */
               if (!p3 || (p3->type != PV_GOTO && p3->type != PV_BREAK && p3->type != PV_RETURN)) {
                  /* is there a following CASE/PATTERN/DEFAULT? */
                  if (p2->next && p2->next->type == PV_CASE) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_APPCALL;
                     fall_thru->app = strdup("Goto");
                     snprintf(buf1, BUF_SIZE, "sw_%d_%s,10", local_control_statement_count, p2->next->u1.str);
                     fall_thru->appargs = strdup(buf1);
                     linkprio(switch_case, fall_thru, mother_exten);
                  } else if (p2->next && p2->next->type == PV_PATTERN) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_APPCALL;
                     fall_thru->app = strdup("Goto");
                     gen_match_to_pattern(p2->next->u1.str, buf2);
                     snprintf(buf1, BUF_SIZE, "sw_%d_%s,10", local_control_statement_count, buf2);
                     fall_thru->appargs = strdup(buf1);
                     linkprio(switch_case, fall_thru, mother_exten);
                  } else if (p2->next && p2->next->type == PV_DEFAULT) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_APPCALL;
                     fall_thru->app = strdup("Goto");
                     snprintf(buf1, BUF_SIZE, "sw_%d_.,10", local_control_statement_count);
                     fall_thru->appargs = strdup(buf1);
                     linkprio(switch_case, fall_thru, mother_exten);
                  } else if (!p2->next) {
                     fall_thru = new_prio();
                     fall_thru->type = AEL_CONTROL1;
                     fall_thru->goto_true = switch_end;
                     fall_thru->app = strdup("Goto");
                     linkprio(switch_case, fall_thru, mother_exten);
                  }
               }
               if (switch_case->return_needed) { /* returns don't generate a goto eoe (end of extension) any more, just a Return() app call) */
                  char buf[2000];
                  struct ael_priority *np2 = new_prio();
                  np2->type = AEL_APPCALL;
                  np2->app = strdup("NoOp");
                  snprintf(buf,sizeof(buf),"End of Extension %s", switch_case->name);
                  np2->appargs = strdup(buf);
                  linkprio(switch_case, np2, mother_exten);
                  switch_case-> return_target = np2;
               }
            } else {
               /* what could it be??? */
            }
         }
         
         exten->loop_break = loop_break_save;
         exten->loop_continue = loop_continue_save;
         switch_test->origin = p;
         switch_end->origin = p;
         break;

      case PV_MACRO_CALL:
         pr = new_prio();
         pr->type = AEL_APPCALL;
         snprintf(buf1, BUF_SIZE, "%s,~~s~~,1", p->u1.str);
         first = 1;
         for (p2 = p->u2.arglist; p2; p2 = p2->next) {
            if (first)
            {
               strcat(buf1,"(");
               first = 0;
            }
            else
               strcat(buf1,",");
            strcat(buf1,p2->u1.str);
         }
         if (!first)
            strcat(buf1,")");

         pr->app = strdup("Gosub");
         pr->appargs = strdup(buf1);
         pr->origin = p;
         linkprio(exten, pr, mother_exten);
         break;

      case PV_APPLICATION_CALL:
         pr = new_prio();
         pr->type = AEL_APPCALL;
         buf1[0] = 0;
         for (p2 = p->u2.arglist; p2; p2 = p2->next) {
            if (p2 != p->u2.arglist )
               strcat(buf1,",");
            strcat(buf1,p2->u1.str);
         }
         pr->app = strdup(p->u1.str);
         pr->appargs = strdup(buf1);
         pr->origin = p;
         linkprio(exten, pr, mother_exten);
         break;

      case PV_BREAK:
         pr = new_prio();
         pr->type = AEL_CONTROL1; /* simple goto */
         pr->goto_true = exten->loop_break;
         pr->origin = p;
         linkprio(exten, pr, mother_exten);
         break;

      case PV_RETURN: /* hmmmm */
         pr = new_prio();
         pr->type = AEL_RETURN; /* simple Return */
         /* exten->return_needed++; */
         pr->app = strdup("Return");
         pr->appargs = strdup("");
         pr->origin = p;
         linkprio(exten, pr, mother_exten);
         break;

      case PV_CONTINUE:
         pr = new_prio();
         pr->type = AEL_CONTROL1; /* simple goto */
         pr->goto_true = exten->loop_continue;
         pr->origin = p;
         linkprio(exten, pr, mother_exten);
         break;

      case PV_IFTIME:
         control_statement_count++;
         snprintf(new_label, BUF_SIZE, "iftime_%s_%d", label, control_statement_count);
         
         if_test = new_prio();
         if_test->type = AEL_IFTIME_CONTROL;
         snprintf(buf1, BUF_SIZE, "%s,%s,%s,%s",
                p->u1.list->u1.str, 
                p->u1.list->next->u1.str, 
                p->u1.list->next->next->u1.str, 
                p->u1.list->next->next->next->u1.str);
         if_test->app = 0;
         if_test->appargs = strdup(buf1);
         if_test->origin = p;

         if_end = new_prio();
         if_end->type = AEL_APPCALL;
         snprintf(buf1, BUF_SIZE, "Finish iftime_%s_%d", label, control_statement_count);
         if_end->app = strdup("NoOp");
         if_end->appargs = strdup(buf1);

         if (p->u3.else_statements) {
            if_skip = new_prio();
            if_skip->type = AEL_CONTROL1; /* simple goto */
            if_skip->goto_true = if_end;
            if_skip->origin  = p;

         } else {
            if_skip = 0;

            if_test->goto_false = if_end;
         }

         if_false = new_prio();
         if_false->type = AEL_CONTROL1;
         if (p->u3.else_statements) {
            if_false->goto_true = if_skip; /* +1 */
         } else {
            if_false->goto_true = if_end;
         }
         
         /* link & load! */
         linkprio(exten, if_test, mother_exten);
         linkprio(exten, if_false, mother_exten);
         
         /* now, put the body of the if here */
         
         if (gen_prios(exten, new_label, p->u2.statements, mother_exten, this_context)) { /* this will link in all the statements here */
            return -1;
         }
         
         if (p->u3.else_statements) {
            linkprio(exten, if_skip, mother_exten);
            if (gen_prios(exten, new_label, p->u3.else_statements, mother_exten, this_context)) { /* this will link in all the statements here */
               return -1;
            }
         }
         
         linkprio(exten, if_end, mother_exten);
         
         break;

      case PV_RANDOM:
      case PV_IF:
         control_statement_count++;
         snprintf(new_label, BUF_SIZE, "if_%s_%d", label, control_statement_count);
         
         if_test = new_prio();
         if_end = new_prio();
         if_test->type = AEL_IF_CONTROL;
         if_end->type = AEL_APPCALL;
         if ( p->type == PV_RANDOM )
            snprintf(buf1, BUF_SIZE, "$[${RAND(0,99)} < (%s)]", p->u1.str);
         else
            snprintf(buf1, BUF_SIZE, "$[%s]", p->u1.str);
         if_test->app = 0;
         if_test->appargs = strdup(buf1);
         snprintf(buf1, BUF_SIZE, "Finish if_%s_%d", label, control_statement_count);
         if_end->app = strdup("NoOp");
         if_end->appargs = strdup(buf1);
         if_test->origin = p;
         
         if (p->u3.else_statements) {
            if_skip = new_prio();
            if_skip->type = AEL_CONTROL1; /* simple goto */
            if_skip->goto_true = if_end;
            if_test->goto_false = if_skip;;
         } else {
            if_skip = 0;
            if_test->goto_false = if_end;;
         }
         
         /* link & load! */
         linkprio(exten, if_test, mother_exten);
         
         /* now, put the body of the if here */
         
         if (gen_prios(exten, new_label, p->u2.statements, mother_exten, this_context)) { /* this will link in all the statements here */
            return -1;
         }
         
         if (p->u3.else_statements) {
            linkprio(exten, if_skip, mother_exten);
            if (gen_prios(exten, new_label, p->u3.else_statements, mother_exten, this_context)) { /* this will link in all the statements here */
               return -1;
            }
         }
         
         linkprio(exten, if_end, mother_exten);
         
         break;

      case PV_STATEMENTBLOCK:
         if (gen_prios(exten, label, p->u1.list, mother_exten, this_context)) { /* recurse into the block */
            return -1;
         }
         break;

      case PV_CATCH:
         control_statement_count++;
         /* generate an extension with name of catch, put all catch stats
            into this exten! */
         switch_case = new_exten();
         if (mother_exten && mother_exten->checked_switch) {
            switch_case->has_switch = mother_exten->has_switch;
            switch_case->checked_switch = mother_exten->checked_switch;
         }
         if (exten && exten->checked_switch) {
            switch_case->has_switch = exten->has_switch;
            switch_case->checked_switch = exten->checked_switch;
         }
         
         switch_case->context = this_context;
         linkexten(exten,switch_case);
         switch_case->name = strdup(p->u1.str);
         snprintf(new_label, BUF_SIZE, "catch_%s_%d",p->u1.str, control_statement_count);
         
         if (gen_prios(switch_case, new_label, p->u2.statements, mother_exten,this_context)) { /* this will link in all the catch body statements here */
            return -1;
         }
         if (switch_case->return_needed) { /* returns now generate a Return() app call, no longer a goto to the end of the exten */
            char buf[2000];
            struct ael_priority *np2 = new_prio();
            np2->type = AEL_APPCALL;
            np2->app = strdup("NoOp");
            snprintf(buf,sizeof(buf),"End of Extension %s", switch_case->name);
            np2->appargs = strdup(buf);
            linkprio(switch_case, np2, mother_exten);
            switch_case-> return_target = np2;
         }

         break;
      default:
         break;
      }
   }
   free(buf1);
   free(buf2);
   free(new_label);
   return 0;
}

void set_priorities(struct ael_extension *exten)
{
   int i;
   struct ael_priority *pr;
   do {
      if (exten->is_switch)
         i = 10;
      else if (exten->regexten)
         i=2;
      else
         i=1;
      
      for (pr=exten->plist; pr; pr=pr->next) {
         pr->priority_num = i;
         
         if (!pr->origin || (pr->origin && pr->origin->type != PV_LABEL) ) /* Labels don't show up in the dialplan,
                                      but we want them to point to the right
                                      priority, which would be the next line
                                      after the label; */
            i++;
      }
      
      exten = exten->next_exten;
   } while ( exten );
}

void add_extensions(struct ael_extension *exten)
{
   struct ael_priority *pr;
   char *label=0;
   char realext[AST_MAX_EXTENSION];
   if (!exten) {
      ast_log(LOG_WARNING, "This file is Empty!\n" );
      return;
   }
   do {
      struct ael_priority *last = 0;
      
      pbx_substitute_variables_helper(NULL, exten->name, realext, sizeof(realext) - 1);
      if (exten->hints) {
         if (ast_add_extension2(exten->context, 0 /*no replace*/, realext, PRIORITY_HINT, NULL, exten->cidmatch, 
                          exten->hints, NULL, ast_free_ptr, registrar)) {
            ast_log(LOG_WARNING, "Unable to add step at priority 'hint' of extension '%s'\n",
                  exten->name);
         }
      }
      
      for (pr=exten->plist; pr; pr=pr->next) {
         char app[2000];
         char appargs[2000];

         /* before we can add the extension, we need to prep the app/appargs;
            the CONTROL types need to be done after the priority numbers are calculated.
         */
         if (pr->type == AEL_LABEL) /* don't try to put labels in the dialplan! */ {
            last = pr;
            continue;
         }
         
         if (pr->app)
            strcpy(app, pr->app);
         else
            app[0] = 0;
         if (pr->appargs )
            strcpy(appargs, pr->appargs);
         else
            appargs[0] = 0;
         switch( pr->type ) {
         case AEL_APPCALL:
            /* easy case. Everything is all set up */
            break;
            
         case AEL_CONTROL1: /* FOR loop, WHILE loop, BREAK, CONTINUE, IF, IFTIME */
            /* simple, unconditional goto. */
            strcpy(app,"Goto");
            if (pr->goto_true->origin && pr->goto_true->origin->type == PV_SWITCH ) {
               snprintf(appargs,sizeof(appargs),"%s,%d", pr->goto_true->exten->name, pr->goto_true->priority_num);
            } else if (pr->goto_true->origin && pr->goto_true->origin->type == PV_IFTIME && pr->goto_true->origin->u3.else_statements ) {
               snprintf(appargs,sizeof(appargs),"%d", pr->goto_true->priority_num+1);
            } else
               snprintf(appargs,sizeof(appargs),"%d", pr->goto_true->priority_num);
            break;
            
         case AEL_FOR_CONTROL:  /* WHILE loop test, FOR loop test */
            strcpy(app,"GotoIf");
            snprintf(appargs,sizeof(appargs),"%s?%d:%d", pr->appargs, pr->priority_num+1, pr->goto_false->priority_num);
            break;
            
         case AEL_IF_CONTROL:
            strcpy(app,"GotoIf");
            if (pr->origin->u3.else_statements )
               snprintf(appargs,sizeof(appargs),"%s?%d:%d", pr->appargs, pr->priority_num+1, pr->goto_false->priority_num+1);
            else
               snprintf(appargs,sizeof(appargs),"%s?%d:%d", pr->appargs, pr->priority_num+1, pr->goto_false->priority_num);
            break;

         case AEL_RAND_CONTROL:
            strcpy(app,"Random");
            snprintf(appargs,sizeof(appargs),"%s:%d", pr->appargs, pr->goto_true->priority_num+1);
            break;

         case AEL_IFTIME_CONTROL:
            strcpy(app,"GotoIfTime");
            snprintf(appargs,sizeof(appargs),"%s?%d", pr->appargs, pr->priority_num+2);
            break;

         case AEL_RETURN:
            strcpy(app,"Return");
            appargs[0] = 0;
            break;
            
         default:
            break;
         }
         if (last && last->type == AEL_LABEL ) {
            label = last->origin->u1.str;
         }
         else
            label = 0;
         
         if (ast_add_extension2(exten->context, 0 /*no replace*/, realext, pr->priority_num, (label?label:NULL), exten->cidmatch, 
                          app, strdup(appargs), ast_free_ptr, registrar)) {
            ast_log(LOG_WARNING, "Unable to add step at priority '%d' of extension '%s'\n", pr->priority_num, 
                  exten->name);
         }
         last = pr;
      }
      exten = exten->next_exten;
   } while ( exten );
}

static void attach_exten(struct ael_extension **list, struct ael_extension *newmem)
{
   /* travel to the end of the list... */
   struct ael_extension *lptr;
   if( !*list ) {
      *list = newmem;
      return;
   }
   lptr = *list;
   
   while( lptr->next_exten ) {
      lptr = lptr->next_exten;
   }
   /* lptr should now pointing to the last element in the list; it has a null next_exten pointer */
   lptr->next_exten = newmem;
}

static pval *get_extension_or_contxt(pval *p)
{
   while( p && p->type != PV_EXTENSION && p->type != PV_CONTEXT && p->type != PV_MACRO ) {
      
      p = p->dad;
   }
   
   return p;
}

static pval *get_contxt(pval *p)
{
   while( p && p->type != PV_CONTEXT && p->type != PV_MACRO ) {
      
      p = p->dad;
   }
   
   return p;
}

static void fix_gotos_in_extensions(struct ael_extension *exten)
{
   struct ael_extension *e;
   for(e=exten;e;e=e->next_exten) {

      struct ael_priority *p;
      for(p=e->plist;p;p=p->next) {
         
         if( p->origin && p->origin->type == PV_GOTO && p->origin->u3.goto_target_in_case ) {
            
            /* fix the extension of the goto target to the actual extension in the post-compiled dialplan */

            pval *target = p->origin->u2.goto_target;
            struct ael_extension *z = target->u3.compiled_label;
            pval *pv2 = p->origin;
            char buf1[500];
            char *apparg_save = p->appargs;
            
            p->appargs = 0;
            if (!pv2->u1.list->next) /* just one  -- it won't hurt to repeat the extension */ {
               snprintf(buf1,sizeof(buf1),"%s,%s", z->name, pv2->u1.list->u1.str);
               p->appargs = strdup(buf1);
               
            } else if (pv2->u1.list->next && !pv2->u1.list->next->next) /* two */ {
               snprintf(buf1,sizeof(buf1),"%s,%s", z->name, pv2->u1.list->next->u1.str);
               p->appargs = strdup(buf1);
            } else if (pv2->u1.list->next && pv2->u1.list->next->next) {
               snprintf(buf1,sizeof(buf1),"%s,%s,%s", pv2->u1.list->u1.str, 
                      z->name,
                      pv2->u1.list->next->next->u1.str);
               p->appargs = strdup(buf1);
            }
            else
               printf("WHAT? The goto doesn't fall into one of three cases for GOTO????\n");
            
            if( apparg_save ) {
               free(apparg_save);
            }
         }
      }
   }
}

static int context_used(struct ael_extension *exten_list, struct ast_context *context)
{
   struct ael_extension *exten;
   /* Check the simple elements first */
   if (ast_walk_context_extensions(context, NULL) || ast_walk_context_includes(context, NULL) || ast_walk_context_ignorepats(context, NULL) || ast_walk_context_switches(context, NULL)) {
      return 1;
   }
   for (exten = exten_list; exten; exten = exten->next_exten) {
      if (exten->context == context) {
         return 1;
      }
   }
   return 0;
}

int ast_compile_ael2(struct ast_context **local_contexts, struct ast_hashtab *local_table, struct pval *root)
{
   pval *p,*p2;
   struct ast_context *context;
   char buf[2000];
   struct ael_extension *exten;
   struct ael_extension *exten_list = 0;

   for (p=root; p; p=p->next ) { /* do the globals first, so they'll be there
                            when we try to eval them */
      switch (p->type) {
      case PV_GLOBALS:
         /* just VARDEC elements */
         for (p2=p->u1.list; p2; p2=p2->next) {
            char buf2[2000];
            snprintf(buf2,sizeof(buf2),"%s=%s", p2->u1.str, p2->u2.val);
            pbx_builtin_setvar(NULL, buf2);
         }
         break;
      default:
         break;
      }
   }

   for (p=root; p; p=p->next ) {
      pval *lp;
      int argc;
      
      switch (p->type) {
      case PV_MACRO:
         
         context = ast_context_find_or_create(local_contexts, local_table, p->u1.str, registrar);
         
         exten = new_exten();
         exten->context = context;
         exten->name = strdup("~~s~~");
         argc = 1;
         for (lp=p->u2.arglist; lp; lp=lp->next) {
            /* for each arg, set up a "Set" command */
            struct ael_priority *np2 = new_prio();
            np2->type = AEL_APPCALL;
            if (!ast_compat_app_set) {
               np2->app = strdup("MSet");
            } else {
               np2->app = strdup("Set");
            }
            snprintf(buf,sizeof(buf),"LOCAL(%s)=${ARG%d}", lp->u1.str, argc++);
            remove_spaces_before_equals(buf);
            np2->appargs = strdup(buf);
            linkprio(exten, np2, NULL);
         }
         
         /* CONTAINS APPCALLS, CATCH, just like extensions... */
         if (gen_prios(exten, p->u1.str, p->u3.macro_statements, 0, context)) {
            return -1;
         }
         if (exten->return_needed) {  /* most likely, this will go away */
            struct ael_priority *np2 = new_prio();
            np2->type = AEL_APPCALL;
            np2->app = strdup("NoOp");
            snprintf(buf,sizeof(buf),"End of Macro %s-%s",p->u1.str, exten->name);
            np2->appargs = strdup(buf);
            linkprio(exten, np2, NULL);
            exten-> return_target = np2;
         }
         
         set_priorities(exten);
         attach_exten(&exten_list, exten);
         break;
         
      case PV_GLOBALS:
         /* already done */
         break;
         
      case PV_CONTEXT:
         context = ast_context_find_or_create(local_contexts, local_table, p->u1.str, registrar);
         
         /* contexts contain: ignorepat, includes, switches, eswitches, extensions,  */
         for (p2=p->u2.statements; p2; p2=p2->next) {
            pval *p3;
            char *s3;
            
            switch (p2->type) {
            case PV_EXTENSION:
               exten = new_exten();
               exten->name = strdup(p2->u1.str);
               exten->context = context;
               
               if( (s3=strchr(exten->name, '/') ) != 0 )
               {
                  *s3 = 0;
                  exten->cidmatch = s3+1;
               }
               
               if ( p2->u3.hints )
                  exten->hints = strdup(p2->u3.hints);
               exten->regexten = p2->u4.regexten;
               if (gen_prios(exten, p->u1.str, p2->u2.statements, 0, context)) {
                  return -1;
               }
               if (exten->return_needed) { /* returns don't generate a goto eoe (end of extension) any more, just a Return() app call) */
                  struct ael_priority *np2 = new_prio();
                  np2->type = AEL_APPCALL;
                  np2->app = strdup("NoOp");
                  snprintf(buf,sizeof(buf),"End of Extension %s", exten->name);
                  np2->appargs = strdup(buf);
                  linkprio(exten, np2, NULL);
                  exten-> return_target = np2;
               }
               /* is the last priority in the extension a label? Then add a trailing no-op */
               if ( exten->plist_last && exten->plist_last->type == AEL_LABEL ) {
                  struct ael_priority *np2 = new_prio();
                  np2->type = AEL_APPCALL;
                  np2->app = strdup("NoOp");
                  snprintf(buf,sizeof(buf),"A NoOp to follow a trailing label %s", exten->plist_last->origin->u1.str);
                  np2->appargs = strdup(buf);
                  linkprio(exten, np2, NULL);
               }

               set_priorities(exten);
               attach_exten(&exten_list, exten);
               break;
               
            case PV_IGNOREPAT:
               ast_context_add_ignorepat2(context, p2->u1.str, registrar);
               break;
               
            case PV_INCLUDES:
               for (p3 = p2->u1.list; p3 ;p3=p3->next) {
                  if ( p3->u2.arglist ) {
                     snprintf(buf,sizeof(buf), "%s,%s,%s,%s,%s", 
                            p3->u1.str,
                            p3->u2.arglist->u1.str,
                            p3->u2.arglist->next->u1.str,
                            p3->u2.arglist->next->next->u1.str,
                            p3->u2.arglist->next->next->next->u1.str);
                     ast_context_add_include2(context, buf, registrar);
                  } else
                     ast_context_add_include2(context, p3->u1.str, registrar);
               }
               break;
               
            case PV_SWITCHES:
               for (p3 = p2->u1.list; p3 ;p3=p3->next) {
                  char *c = strchr(p3->u1.str, '/');
                  if (c) {
                     *c = '\0';
                     c++;
                  } else
                     c = "";

                  ast_context_add_switch2(context, p3->u1.str, c, 0, registrar);
               }
               break;

            case PV_ESWITCHES:
               for (p3 = p2->u1.list; p3 ;p3=p3->next) {
                  char *c = strchr(p3->u1.str, '/');
                  if (c) {
                     *c = '\0';
                     c++;
                  } else
                     c = "";

                  ast_context_add_switch2(context, p3->u1.str, c, 1, registrar);
               }
               break;
            default:
               break;
            }
         }
         
         break;
         
      default:
         /* huh? what? */
         break;
         
      }
   }

   /* Create default "h" bubble context */
   if (ast_custom_function_find("DIALPLAN_EXISTS") && ast_custom_function_find("STACK_PEEK")) {
      int i;
      const char *h_context = "ael-builtin-h-bubble";
      struct ael_priority *np;
      struct {
         int priority;
         const char *app;
         const char *arg;
      } steps[] = {
         /* Start high, to avoid conflict with existing h extensions */
         { 1, "Goto", "9991" },
         /* Save the context, because after the StackPop, it disappears */
         { 9991, "Set", "~~parentcxt~~=${STACK_PEEK(1,c,1)}" },
         /* If we're not in a Gosub frame, exit */
         { 9992, "GotoIf", "$[\"${~~parentcxt~~}\"=\"\"]?9996" },
         /* Check for an "h" extension in that context */
         { 9993, "GotoIf", "${DIALPLAN_EXISTS(${~~parentcxt~~},h,1)}?9994:9996" },
         /* Pop off the stack frame to prevent an infinite loop */
         { 9994, "StackPop", "" },
         /* Finally, go there. */
         { 9995, "Goto", "${~~parentcxt~~},h,1" },
         /* Just an empty priority for jumping out early */
         { 9996, "NoOp", "" }
      };
      context = ast_context_find_or_create(local_contexts, local_table, h_context, registrar);
      if (context_used(exten_list, context)) {
         int found = 0;
         while (!found) {
            /* Pick a new context name that is not used. */
            char h_context_template[] = "/tmp/ael-builtin-h-bubble-XXXXXX";
            int fd = mkstemp(h_context_template);
            unlink(h_context_template);
            close(fd);
            context = ast_context_find_or_create(local_contexts, local_table, h_context_template + 5, registrar);
            found = !context_used(exten_list, context);
         }
         h_context = ast_get_context_name(context);
      }
      exten = new_exten();
      exten->context = context;
      exten->name = strdup("h");

      for (i = 0; i < ARRAY_LEN(steps); i++) {
         np = new_prio();
         np->type = AEL_APPCALL;
         np->priority_num = steps[i].priority;
         np->app = strdup(steps[i].app);
         np->appargs = strdup(steps[i].arg);
         linkprio(exten, np, NULL);
      }
      attach_exten(&exten_list, exten);

      /* Include the default "h" bubble context in each macro context */
      for (exten = exten_list; exten; exten = exten->next_exten) {
         /* All macros contain a "~~s~~" extension, and it's the first created.  If
          * we perchance get a non-macro context, it's no big deal; the logic is
          * designed to exit out smoothly if not called from within a Gosub. */
         if (!strcmp(exten->name, "~~s~~")) {
            ast_context_add_include2(exten->context, h_context, registrar);
         }
      }
   }

   /* moved these from being done after a macro or extension were processed,
      to after all processing is done, for the sake of fixing gotos to labels inside cases... */
   /* I guess this would be considered 2nd pass of compiler now... */
   fix_gotos_in_extensions(exten_list); /* find and fix extension ref in gotos to labels that are in case statements */
   add_extensions(exten_list);   /* actually makes calls to create priorities in ast_contexts -- feeds dialplan to asterisk */
   destroy_extensions(exten_list);  /* all that remains is an empty husk, discard of it as is proper */
   
   return 0;
}


/* DESTROY the PVAL tree ============================================================================ */



void destroy_pval_item(pval *item)
{
   if (item == NULL) {
      ast_log(LOG_WARNING, "null item\n");
      return;
   }

   if (item->filename)
      free(item->filename);
   
   switch (item->type) {
   case PV_WORD:
      /* fields: item->u1.str == string associated with this (word). */
      if (item->u1.str )
         free(item->u1.str);
      if ( item->u2.arglist )
         destroy_pval(item->u2.arglist);
      break;
      
   case PV_MACRO:
      /* fields: item->u1.str     == name of macro
                 item->u2.arglist == pval list of PV_WORD arguments of macro, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg

               item->u3.macro_statements == pval list of statements in macro body.
      */
      destroy_pval(item->u2.arglist);
      if (item->u1.str )
         free(item->u1.str);
      destroy_pval(item->u3.macro_statements);
      break;
         
   case PV_CONTEXT:
      /* fields: item->u1.str     == name of context
                 item->u2.statements == pval list of statements in context body
               item->u3.abstract == int 1 if an abstract keyword were present
      */
      if (item->u1.str)
         free(item->u1.str);
      destroy_pval(item->u2.statements);
      break;
         
   case PV_MACRO_CALL:
      /* fields: item->u1.str     == name of macro to call
                 item->u2.arglist == pval list of PV_WORD arguments of macro call, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg
      */
      if (item->u1.str)
         free(item->u1.str);
      destroy_pval(item->u2.arglist);
      break;
         
   case PV_APPLICATION_CALL:
      /* fields: item->u1.str     == name of application to call
                 item->u2.arglist == pval list of PV_WORD arguments of macro call, as given by user
               item->u2.arglist->u1.str  == argument
               item->u2.arglist->next   == next arg
      */
      if (item->u1.str)
         free(item->u1.str);
      destroy_pval(item->u2.arglist);
      break;
         
   case PV_CASE:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      if (item->u1.str)
         free(item->u1.str);
      destroy_pval(item->u2.statements);
      break;
         
   case PV_PATTERN:
      /* fields: item->u1.str     == value of case
                 item->u2.statements == pval list of statements under the case
      */
      if (item->u1.str)
         free(item->u1.str);
      destroy_pval(item->u2.statements);
      break;
         
   case PV_DEFAULT:
      /* fields: 
                 item->u2.statements == pval list of statements under the case
      */
      destroy_pval(item->u2.statements);
      break;
         
   case PV_CATCH:
      /* fields: item->u1.str     == name of extension to catch
                 item->u2.statements == pval list of statements in context body
      */
      if (item->u1.str)
         free(item->u1.str);
      destroy_pval(item->u2.statements);
      break;
         
   case PV_SWITCHES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      destroy_pval(item->u1.list);
      break;
         
   case PV_ESWITCHES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
      */
      destroy_pval(item->u1.list);
      break;
         
   case PV_INCLUDES:
      /* fields: item->u1.list     == pval list of PV_WORD elements, one per entry in the list
                 item->u2.arglist  == pval list of 4 PV_WORD elements for time values
      */
      destroy_pval(item->u1.list);
      break;
         
   case PV_STATEMENTBLOCK:
      /* fields: item->u1.list     == pval list of statements in block, one per entry in the list
      */
      destroy_pval(item->u1.list);
      break;
         
   case PV_LOCALVARDEC:
   case PV_VARDEC:
      /* fields: item->u1.str     == variable name
                 item->u2.val     == variable value to assign
      */
      if (item->u1.str)
         free(item->u1.str);
      if (item->u2.val)
         free(item->u2.val);
      break;
         
   case PV_GOTO:
      /* fields: item->u1.list     == pval list of PV_WORD target names, up to 3, in order as given by user.
                 item->u1.list->u1.str  == where the data on a PV_WORD will always be.
      */
      
      destroy_pval(item->u1.list);
      break;
         
   case PV_LABEL:
      /* fields: item->u1.str     == label name
      */
      if (item->u1.str)
         free(item->u1.str);
      break;
         
   case PV_FOR:
      /* fields: item->u1.for_init     == a string containing the initalizer
                 item->u2.for_test     == a string containing the loop test
                 item->u3.for_inc      == a string containing the loop increment

               item->u4.for_statements == a pval list of statements in the for ()
      */
      if (item->u1.for_init)
         free(item->u1.for_init);
      if (item->u2.for_test)
         free(item->u2.for_test);
      if (item->u3.for_inc)
         free(item->u3.for_inc);
      destroy_pval(item->u4.for_statements);
      break;
         
   case PV_WHILE:
      /* fields: item->u1.str        == the while conditional, as supplied by user

               item->u2.statements == a pval list of statements in the while ()
      */
      if (item->u1.str)
         free(item->u1.str);
      destroy_pval(item->u2.statements);
      break;
         
   case PV_BREAK:
      /* fields: none
      */
      break;
         
   case PV_RETURN:
      /* fields: none
      */
      break;
         
   case PV_CONTINUE:
      /* fields: none
      */
      break;
         
   case PV_IFTIME:
      /* fields: item->u1.list        == the 4 time values, in PV_WORD structs, linked list

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      destroy_pval(item->u1.list);
      destroy_pval(item->u2.statements);
      if (item->u3.else_statements) {
         destroy_pval(item->u3.else_statements);
      }
      break;
         
   case PV_RANDOM:
      /* fields: item->u1.str        == the random percentage, as supplied by user

               item->u2.statements == a pval list of statements in the true part ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      fall thru to If */
   case PV_IF:
      /* fields: item->u1.str        == the if conditional, as supplied by user

               item->u2.statements == a pval list of statements in the if ()
               item->u3.else_statements == a pval list of statements in the else
                                    (could be zero)
      */
      if (item->u1.str)
         free(item->u1.str);
      destroy_pval(item->u2.statements);
      if (item->u3.else_statements) {
         destroy_pval(item->u3.else_statements);
      }
      break;
         
   case PV_SWITCH:
      /* fields: item->u1.str        == the switch expression

               item->u2.statements == a pval list of statements in the switch, 
                                    (will be case statements, most likely!)
      */
      if (item->u1.str)
         free(item->u1.str);
      destroy_pval(item->u2.statements);
      break;
         
   case PV_EXTENSION:
      /* fields: item->u1.str        == the extension name, label, whatever it's called

               item->u2.statements == a pval list of statements in the extension
               item->u3.hints      == a char * hint argument
               item->u4.regexten   == an int boolean. non-zero says that regexten was specified
      */
      if (item->u1.str)
         free(item->u1.str);
      if (item->u3.hints)
         free(item->u3.hints);
      destroy_pval(item->u2.statements);
      break;
         
   case PV_IGNOREPAT:
      /* fields: item->u1.str        == the ignorepat data
      */
      if (item->u1.str)
         free(item->u1.str);
      break;
         
   case PV_GLOBALS:
      /* fields: item->u1.statements     == pval list of statements, usually vardecs
      */
      destroy_pval(item->u1.statements);
      break;
   }
   free(item);
}

void destroy_pval(pval *item) 
{
   pval *i,*nxt;
   
   for (i=item; i; i=nxt) {
      nxt = i->next;
      
      destroy_pval_item(i);
   }
}

#ifdef AAL_ARGCHECK
static char *ael_funclist[] =
{
   "AGENT",
   "ARRAY",
   "BASE64_DECODE",
   "BASE64_ENCODE",
   "CALLERID",
   "CDR",
   "CHANNEL",
   "CHECKSIPDOMAIN",
   "CHECK_MD5",
   "CURL",
   "CUT",
   "DB",
   "DB_EXISTS",
   "DUNDILOOKUP",
   "ENUMLOOKUP",
   "ENV",
   "EVAL",
   "EXISTS",
   "FIELDQTY",
   "FILTER",
   "GROUP",
   "GROUP_COUNT",
   "GROUP_LIST",
   "GROUP_MATCH_COUNT",
   "IAXPEER",
   "IF",
   "IFTIME",
   "ISNULL",
   "KEYPADHASH",
   "LANGUAGE",
   "LEN",
   "MATH",
   "MD5",
   "MUSICCLASS",
   "QUEUEAGENTCOUNT",
   "QUEUE_MEMBER_COUNT",
   "QUEUE_MEMBER_LIST",
   "QUOTE",
   "RAND",
   "REGEX",
   "SET",
   "SHA1",
   "SIPCHANINFO",
   "SIPPEER",
   "SIP_HEADER",
   "SORT",
   "STAT",
   "STRFTIME",
   "STRPTIME",
   "TIMEOUT",
   "TXTCIDNAME",
   "URIDECODE",
   "URIENCODE",
   "VMCOUNT"
};


int ael_is_funcname(char *name)
{
   int s,t;
   t = sizeof(ael_funclist)/sizeof(char*);
   s = 0;
   while ((s < t) && strcasecmp(name, ael_funclist[s])) 
      s++;
   if ( s < t )
      return 1;
   else
      return 0;
}
#endif    


/* PVAL PI */

/* ----------------- implementation ------------------- */


int  pvalCheckType( pval *p, char *funcname, pvaltype type )
{
   if (p->type != type)
   {
      ast_log(LOG_ERROR, "Func: %s the pval passed is not appropriate for this function!\n", funcname);
      return 0;
   }
   return 1;
}


pval *pvalCreateNode( pvaltype type )
{
   pval *p = calloc(1,sizeof(pval)); /* why, oh why, don't I use ast_calloc? Way, way, way too messy if I do! */
   p->type = type;                   /* remember, this can be used externally or internally to asterisk */
   return p;
}

pvaltype pvalObjectGetType( pval *p )
{
   return p->type;
}


void pvalWordSetString( pval *p, char *str)
{
   if (!pvalCheckType(p, "pvalWordSetString", PV_WORD))
      return;
   p->u1.str = str;
}

char *pvalWordGetString( pval *p )
{
   if (!pvalCheckType(p, "pvalWordGetString", PV_WORD))
      return 0;
   return p->u1.str;
}


void pvalMacroSetName( pval *p, char *name)
{
   if (!pvalCheckType(p, "pvalMacroSetName", PV_MACRO))
      return;
   p->u1.str = name;
}

char *pvalMacroGetName( pval *p )
{
   if (!pvalCheckType(p, "pvalMacroGetName", PV_MACRO))
      return 0;
   return p->u1.str;
}

void pvalMacroSetArglist( pval *p, pval *arglist )
{
   if (!pvalCheckType(p, "pvalMacroSetArglist", PV_MACRO))
      return;
   p->u2.arglist = arglist;
}

void pvalMacroAddArg( pval *p, pval *arg ) /* single arg only! */
{
   if (!pvalCheckType(p, "pvalMacroAddArg", PV_MACRO))
      return;
   if (!p->u2.arglist)
      p->u2.arglist = arg;
   else
      linku1(p->u2.arglist, arg);

}

pval *pvalMacroWalkArgs( pval *p, pval **arg )
{
   if (!pvalCheckType(p, "pvalMacroWalkArgs", PV_MACRO))
      return 0;
   if (!(*arg))
      *arg = p->u2.arglist;
   else {
      *arg = (*arg)->next;
   }
   return *arg;
}

void pvalMacroAddStatement( pval *p, pval *statement )
{
   if (!pvalCheckType(p, "pvalMacroAddStatement", PV_MACRO))
      return;
   if (!p->u3.macro_statements)
      p->u3.macro_statements = statement;
   else
      linku1(p->u3.macro_statements, statement);

   
}

pval *pvalMacroWalkStatements( pval *p, pval **next_statement )
{
   if (!pvalCheckType(p, "pvalMacroWalkStatements", PV_MACRO))
      return 0;
   if (!(*next_statement))
      *next_statement = p->u3.macro_statements;
   else {
      *next_statement = (*next_statement)->next;
   }
   return *next_statement;
}



void pvalContextSetName( pval *p, char *name)
{
   if (!pvalCheckType(p, "pvalContextSetName", PV_CONTEXT))
      return;
   p->u1.str = name;
}

char *pvalContextGetName( pval *p )
{
   if (!pvalCheckType(p, "pvalContextGetName", PV_CONTEXT))
      return 0;
   return p->u1.str;
}

void pvalContextSetAbstract( pval *p )
{
   if (!pvalCheckType(p, "pvalContextSetAbstract", PV_CONTEXT))
      return;
   p->u3.abstract = 1;
}

void pvalContextUnsetAbstract( pval *p )
{
   if (!pvalCheckType(p, "pvalContextUnsetAbstract", PV_CONTEXT))
      return;
   p->u3.abstract = 0;
}

int  pvalContextGetAbstract( pval *p )
{
   if (!pvalCheckType(p, "pvalContextGetAbstract", PV_CONTEXT))
      return 0;
   return p->u3.abstract;
}



void pvalContextAddStatement( pval *p, pval *statement) /* this includes SWITCHES, INCLUDES, IGNOREPAT, etc */
{
   if (!pvalCheckType(p, "pvalContextAddStatement", PV_CONTEXT))
      return;
   if (!p->u2.statements)
      p->u2.statements = statement;
   else
      linku1(p->u2.statements, statement);
}

pval *pvalContextWalkStatements( pval *p, pval **statements )
{
   if (!pvalCheckType(p, "pvalContextWalkStatements", PV_CONTEXT))
      return 0;
   if (!(*statements))
      *statements = p->u2.statements;
   else {
      *statements = (*statements)->next;
   }
   return *statements;
}


void pvalMacroCallSetMacroName( pval *p, char *name )
{
   if (!pvalCheckType(p, "pvalMacroCallSetMacroName", PV_MACRO_CALL))
      return;
   p->u1.str = name;
}

char* pvalMacroCallGetMacroName( pval *p )
{
   if (!pvalCheckType(p, "pvalMacroCallGetMacroName", PV_MACRO_CALL))
      return 0;
   return p->u1.str;
}

void pvalMacroCallSetArglist( pval *p, pval *arglist )
{
   if (!pvalCheckType(p, "pvalMacroCallSetArglist", PV_MACRO_CALL))
      return;
   p->u2.arglist = arglist;
}

void pvalMacroCallAddArg( pval *p, pval *arg )
{
   if (!pvalCheckType(p, "pvalMacroCallGetAddArg", PV_MACRO_CALL))
      return;
   if (!p->u2.arglist)
      p->u2.arglist = arg;
   else
      linku1(p->u2.arglist, arg);
}

pval *pvalMacroCallWalkArgs( pval *p, pval **args )
{
   if (!pvalCheckType(p, "pvalMacroCallWalkArgs", PV_MACRO_CALL))
      return 0;
   if (!(*args))
      *args = p->u2.arglist;
   else {
      *args = (*args)->next;
   }
   return *args;
}


void pvalAppCallSetAppName( pval *p, char *name )
{
   if (!pvalCheckType(p, "pvalAppCallSetAppName", PV_APPLICATION_CALL))
      return;
   p->u1.str = name;
}

char* pvalAppCallGetAppName( pval *p )
{
   if (!pvalCheckType(p, "pvalAppCallGetAppName", PV_APPLICATION_CALL))
      return 0;
   return p->u1.str;
}

void pvalAppCallSetArglist( pval *p, pval *arglist )
{
   if (!pvalCheckType(p, "pvalAppCallSetArglist", PV_APPLICATION_CALL))
      return;
   p->u2.arglist = arglist;
}

void pvalAppCallAddArg( pval *p, pval *arg )
{
   if (!pvalCheckType(p, "pvalAppCallAddArg", PV_APPLICATION_CALL))
      return;
   if (!p->u2.arglist)
      p->u2.arglist = arg;
   else
      linku1(p->u2.arglist, arg);
}

pval *pvalAppCallWalkArgs( pval *p, pval **args )
{
   if (!pvalCheckType(p, "pvalAppCallWalkArgs", PV_APPLICATION_CALL))
      return 0;
   if (!(*args))
      *args = p->u2.arglist;
   else {
      *args = (*args)->next;
   }
   return *args;
}


void pvalCasePatSetVal( pval *p, char *val )
{
   if (!pvalCheckType(p, "pvalAppCallWalkArgs", PV_APPLICATION_CALL))
      return;
   p->u1.str = val;
}

char* pvalCasePatGetVal( pval *p )
{
   return p->u1.str;
}

void pvalCasePatDefAddStatement( pval *p, pval *statement )
{
   if (!p->u2.arglist)
      p->u2.statements = statement;
   else
      linku1(p->u2.statements, statement);
}

pval *pvalCasePatDefWalkStatements( pval *p, pval **statement )
{
   if (!(*statement))
      *statement = p->u2.statements;
   else {
      *statement = (*statement)->next;
   }
   return *statement;
}


void pvalCatchSetExtName( pval *p, char *name )
{
   if (!pvalCheckType(p, "pvalCatchSetExtName", PV_CATCH))
      return;
   p->u1.str = name;
}

char* pvalCatchGetExtName( pval *p )
{
   if (!pvalCheckType(p, "pvalCatchGetExtName", PV_CATCH))
      return 0;
   return p->u1.str;
}

void pvalCatchSetStatement( pval *p, pval *statement )
{
   if (!pvalCheckType(p, "pvalCatchSetStatement", PV_CATCH))
      return;
   p->u2.statements = statement;
}

pval *pvalCatchGetStatement( pval *p )
{
   if (!pvalCheckType(p, "pvalCatchGetStatement", PV_CATCH))
      return 0;
   return p->u2.statements;
}


void pvalSwitchesAddSwitch( pval *p, char *name )
{
   pval *s;
   if (!pvalCheckType(p, "pvalSwitchesAddSwitch", PV_SWITCHES))
      return;
   s = pvalCreateNode(PV_WORD);
   s->u1.str = name;
   p->u1.list = linku1(p->u1.list, s);
}

char* pvalSwitchesWalkNames( pval *p, pval **next_item )
{
   if (!pvalCheckType(p, "pvalSwitchesWalkNames", PV_SWITCHES))
      return 0;
   if (!(*next_item))
      *next_item = p->u1.list;
   else {
      *next_item = (*next_item)->next;
   }
   return (*next_item)->u1.str;
}

void pvalESwitchesAddSwitch( pval *p, char *name )
{
   pval *s;
   if (!pvalCheckType(p, "pvalESwitchesAddSwitch", PV_ESWITCHES))
      return;
   s = pvalCreateNode(PV_WORD);
   s->u1.str = name;
   p->u1.list = linku1(p->u1.list, s);
}

char* pvalESwitchesWalkNames( pval *p, pval **next_item )
{
   if (!pvalCheckType(p, "pvalESwitchesWalkNames", PV_ESWITCHES))
      return 0;
   if (!(*next_item))
      *next_item = p->u1.list;
   else {
      *next_item = (*next_item)->next;
   }
   return (*next_item)->u1.str;
}


void pvalIncludesAddInclude( pval *p, const char *include )
{
   pval *s;
   if (!pvalCheckType(p, "pvalIncludesAddSwitch", PV_INCLUDES))
      return;
   s = pvalCreateNode(PV_WORD);
   s->u1.str = (char *)include;
   p->u1.list = linku1(p->u1.list, s);
}
 /* an include is a WORD with string set to path */

void pvalIncludesAddIncludeWithTimeConstraints( pval *p, const char *include, char *hour_range, char *dom_range, char *dow_range, char *month_range )
{
   pval *hr = pvalCreateNode(PV_WORD);
   pval *dom = pvalCreateNode(PV_WORD);
   pval *dow = pvalCreateNode(PV_WORD);
   pval *mon = pvalCreateNode(PV_WORD);
   pval *s = pvalCreateNode(PV_WORD);
   
   if (!pvalCheckType(p, "pvalIncludeAddIncludeWithTimeConstraints", PV_INCLUDES))
      return;

   s->u1.str = (char *)include;
   p->u1.list = linku1(p->u1.list, s);

   hr->u1.str = hour_range;
   dom->u1.str = dom_range;
   dow->u1.str = dow_range;
   mon->u1.str = month_range;

   s->u2.arglist = hr;

   hr->next = dom;
   dom->next = dow;
   dow->next = mon;
   mon->next = 0;
}
 /* is this right??? come back and correct it */ /*the ptr is to the WORD */
void pvalIncludeGetTimeConstraints( pval *p, char **hour_range, char **dom_range, char **dow_range, char **month_range )
{
   if (!pvalCheckType(p, "pvalIncludeGetTimeConstraints", PV_WORD))
      return;
   if (p->u2.arglist) {
      *hour_range = p->u2.arglist->u1.str;
      *dom_range = p->u2.arglist->next->u1.str;
      *dow_range = p->u2.arglist->next->next->u1.str;
      *month_range = p->u2.arglist->next->next->next->u1.str;
   } else {
      *hour_range = 0;
      *dom_range = 0;
      *dow_range = 0;
      *month_range = 0;
   }
}
 /* is this right??? come back and correct it */ /*the ptr is to the WORD */
char* pvalIncludesWalk( pval *p, pval **next_item )
{
   if (!pvalCheckType(p, "pvalIncludesWalk", PV_INCLUDES))
      return 0;
   if (!(*next_item))
      *next_item = p->u1.list;
   else {
      *next_item = (*next_item)->next;
   }
   return (*next_item)->u1.str;
}


void pvalStatementBlockAddStatement( pval *p, pval *statement)
{
   if (!pvalCheckType(p, "pvalStatementBlockAddStatement", PV_STATEMENTBLOCK))
      return;
   p->u1.list = linku1(p->u1.list, statement);
}

pval *pvalStatementBlockWalkStatements( pval *p, pval **next_statement)
{
   if (!pvalCheckType(p, "pvalStatementBlockWalkStatements", PV_STATEMENTBLOCK))
      return 0;
   if (!(*next_statement))
      *next_statement = p->u1.list;
   else {
      *next_statement = (*next_statement)->next;
   }
   return *next_statement;
}

void pvalVarDecSetVarname( pval *p, char *name )
{
   if (!pvalCheckType(p, "pvalVarDecSetVarname", PV_VARDEC))
      return;
   p->u1.str = name;
}

void pvalVarDecSetValue( pval *p, char *value )
{
   if (!pvalCheckType(p, "pvalVarDecSetValue", PV_VARDEC))
      return;
   p->u2.val = value;
}

char* pvalVarDecGetVarname( pval *p )
{
   if (!pvalCheckType(p, "pvalVarDecGetVarname", PV_VARDEC))
      return 0;
   return p->u1.str;
}

char* pvalVarDecGetValue( pval *p )
{
   if (!pvalCheckType(p, "pvalVarDecGetValue", PV_VARDEC))
      return 0;
   return p->u2.val;
}

void pvalGotoSetTarget( pval *p, char *context, char *exten, char *label )
{
   pval *con, *ext, *pri;
   
   if (!pvalCheckType(p, "pvalGotoSetTarget", PV_GOTO))
      return;
   if (context && strlen(context)) {
      con = pvalCreateNode(PV_WORD);
      ext = pvalCreateNode(PV_WORD);
      pri = pvalCreateNode(PV_WORD);
      
      con->u1.str = context;
      ext->u1.str = exten;
      pri->u1.str = label;
      
      con->next = ext;
      ext->next = pri;
      p->u1.list = con;
   } else if (exten && strlen(exten)) {
      ext = pvalCreateNode(PV_WORD);
      pri = pvalCreateNode(PV_WORD);
      
      ext->u1.str = exten;
      pri->u1.str = label;
      
      ext->next = pri;
      p->u1.list = ext;
   } else {
      pri = pvalCreateNode(PV_WORD);
      
      pri->u1.str = label;
      
      p->u1.list = pri;
   }
}

void pvalGotoGetTarget( pval *p, char **context, char **exten, char **label )
{
   if (!pvalCheckType(p, "pvalGotoGetTarget", PV_GOTO))
      return;
   if (p->u1.list && p->u1.list->next && p->u1.list->next->next) {
      *context = p->u1.list->u1.str;
      *exten = p->u1.list->next->u1.str;
      *label = p->u1.list->next->next->u1.str;
      
   } else if (p->u1.list && p->u1.list->next ) {
      *exten = p->u1.list->u1.str;
      *label = p->u1.list->next->u1.str;
      *context = 0;

   } else if (p->u1.list) {
      *label = p->u1.list->u1.str;
      *context = 0;
      *exten = 0;
      
   } else {
      *context = 0;
      *exten = 0;
      *label = 0;
   }
}


void pvalLabelSetName( pval *p, char *name )
{
   if (!pvalCheckType(p, "pvalLabelSetName", PV_LABEL))
      return;
   p->u1.str = name;
}

char* pvalLabelGetName( pval *p )
{
   if (!pvalCheckType(p, "pvalLabelGetName", PV_LABEL))
      return 0;
   return p->u1.str;
}


void pvalForSetInit( pval *p, char *init )
{
   if (!pvalCheckType(p, "pvalForSetInit", PV_FOR))
      return;
   p->u1.for_init = init;
}

void pvalForSetTest( pval *p, char *test )
{
   if (!pvalCheckType(p, "pvalForSetTest", PV_FOR))
      return;
   p->u2.for_test = test;
}

void pvalForSetInc( pval *p, char *inc )
{
   if (!pvalCheckType(p, "pvalForSetInc", PV_FOR))
      return;
   p->u3.for_inc = inc;
}

void pvalForSetStatement( pval *p, pval *statement )
{
   if (!pvalCheckType(p, "pvalForSetStatement", PV_FOR))
      return;
   p->u4.for_statements = statement;
}

char* pvalForGetInit( pval *p )
{
   if (!pvalCheckType(p, "pvalForGetInit", PV_FOR))
      return 0;
   return p->u1.for_init;
}

char* pvalForGetTest( pval *p )
{
   if (!pvalCheckType(p, "pvalForGetTest", PV_FOR))
      return 0;
   return p->u2.for_test;
}

char* pvalForGetInc( pval *p )
{
   if (!pvalCheckType(p, "pvalForGetInc", PV_FOR))
      return 0;
   return p->u3.for_inc;
}

pval* pvalForGetStatement( pval *p )
{
   if (!pvalCheckType(p, "pvalForGetStatement", PV_FOR))
      return 0;
   return p->u4.for_statements;
}



void pvalIfSetCondition( pval *p, char *expr )
{
   if (!pvalCheckType(p, "pvalIfSetCondition", PV_IF))
      return;
   p->u1.str = expr;
}

char* pvalIfGetCondition( pval *p )
{
   if (!pvalCheckType(p, "pvalIfGetCondition", PV_IFTIME))
      return 0;
   return p->u1.str;
}

void pvalIfTimeSetCondition( pval *p, char *hour_range, char *dow_range, char *dom_range, char *mon_range )  /* time range format: 24-hour format begin-end|dow range|dom range|month range */
{
   pval *hr = pvalCreateNode(PV_WORD);
   pval *dow = pvalCreateNode(PV_WORD);
   pval *dom = pvalCreateNode(PV_WORD);
   pval *mon = pvalCreateNode(PV_WORD);
   if (!pvalCheckType(p, "pvalIfTimeSetCondition", PV_IFTIME))
      return;
   pvalWordSetString(hr, hour_range);
   pvalWordSetString(dow, dow_range);
   pvalWordSetString(dom, dom_range);
   pvalWordSetString(mon, mon_range);
   dom->next = mon;
   dow->next = dom;
   hr->next = dow;
   p->u1.list = hr;
}

 /* is this right??? come back and correct it */
void pvalIfTimeGetCondition( pval *p, char **hour_range, char **dow_range, char **dom_range, char **month_range )
{
   if (!pvalCheckType(p, "pvalIfTimeGetCondition", PV_IFTIME))
      return;
   *hour_range = p->u1.list->u1.str;
   *dow_range = p->u1.list->next->u1.str;
   *dom_range = p->u1.list->next->next->u1.str;
   *month_range = p->u1.list->next->next->next->u1.str;
}

void pvalRandomSetCondition( pval *p, char *percent )
{
   if (!pvalCheckType(p, "pvalRandomSetCondition", PV_RANDOM))
      return;
   p->u1.str = percent;
}

char* pvalRandomGetCondition( pval *p )
{
   if (!pvalCheckType(p, "pvalRandomGetCondition", PV_RANDOM))
      return 0;
   return p->u1.str;
}

void pvalConditionalSetThenStatement( pval *p, pval *statement )
{
   p->u2.statements = statement;
}

void pvalConditionalSetElseStatement( pval *p, pval *statement )
{
   p->u3.else_statements = statement;
}

pval* pvalConditionalGetThenStatement( pval *p )
{
   return p->u2.statements;
}

pval* pvalConditionalGetElseStatement( pval *p )
{
   return p->u3.else_statements;
}

void pvalSwitchSetTestexpr( pval *p, char *expr )
{
   if (!pvalCheckType(p, "pvalSwitchSetTestexpr", PV_SWITCH))
      return;
   p->u1.str = expr;
}

char* pvalSwitchGetTestexpr( pval *p )
{
   if (!pvalCheckType(p, "pvalSwitchGetTestexpr", PV_SWITCH))
      return 0;
   return p->u1.str;
}

void pvalSwitchAddCase( pval *p, pval *Case )
{
   if (!pvalCheckType(p, "pvalSwitchAddCase", PV_SWITCH))
      return;
   if (!pvalCheckType(Case, "pvalSwitchAddCase", PV_CASE))
      return;
   if (!p->u2.statements)
      p->u2.statements = Case;
   else
      linku1(p->u2.statements, Case);
}

pval* pvalSwitchWalkCases( pval *p, pval **next_case )
{
   if (!pvalCheckType(p, "pvalSwitchWalkCases", PV_SWITCH))
      return 0;
   if (!(*next_case))
      *next_case = p->u2.statements;
   else {
      *next_case = (*next_case)->next;
   }
   return *next_case;
}


void pvalExtenSetName( pval *p, char *name )
{
   if (!pvalCheckType(p, "pvalExtenSetName", PV_EXTENSION))
      return;
   p->u1.str = name;
}

char* pvalExtenGetName( pval *p )
{
   if (!pvalCheckType(p, "pvalExtenGetName", PV_EXTENSION))
      return 0;
   return p->u1.str;
}

void pvalExtenSetRegexten( pval *p )
{
   if (!pvalCheckType(p, "pvalExtenSetRegexten", PV_EXTENSION))
      return;
   p->u4.regexten = 1;
}

void pvalExtenUnSetRegexten( pval *p )
{
   if (!pvalCheckType(p, "pvalExtenUnSetRegexten", PV_EXTENSION))
      return;
   p->u4.regexten = 0;
}

int pvalExtenGetRegexten( pval *p )
{
   if (!pvalCheckType(p, "pvalExtenGetRegexten", PV_EXTENSION))
      return 0;
   return p->u4.regexten;
}

void pvalExtenSetHints( pval *p, char *hints )
{
   if (!pvalCheckType(p, "pvalExtenSetHints", PV_EXTENSION))
      return;
   p->u3.hints = hints;
}

char* pvalExtenGetHints( pval *p )
{
   if (!pvalCheckType(p, "pvalExtenGetHints", PV_EXTENSION))
      return 0;
   return p->u3.hints;
}

void pvalExtenSetStatement( pval *p, pval *statement )
{
   if (!pvalCheckType(p, "pvalExtenSetStatement", PV_EXTENSION))
      return;
   p->u2.statements = statement;
}

pval* pvalExtenGetStatement( pval *p )
{
   if (!pvalCheckType(p, "pvalExtenGetStatement", PV_EXTENSION))
      return 0;
   return p->u2.statements;
}


void pvalIgnorePatSetPattern( pval *p, char *pat )
{
   if (!pvalCheckType(p, "pvalIgnorePatSetPattern", PV_IGNOREPAT))
      return;
   p->u1.str = pat;
}

char* pvalIgnorePatGetPattern( pval *p )
{
   if (!pvalCheckType(p, "pvalIgnorePatGetPattern", PV_IGNOREPAT))
      return 0;
   return p->u1.str;
}


void pvalGlobalsAddStatement( pval *p, pval *statement )
{
   if (p->type != PV_GLOBALS) {
      ast_log(LOG_ERROR, "pvalGlobalsAddStatement called where first arg is not a Globals!\n");
   } else {
      if (!p->u1.statements) {
         p->u1.statements = statement;
      } else {
         p->u1.statements = linku1(p->u1.statements,statement);
      }
   }
}

pval* pvalGlobalsWalkStatements( pval *p, pval **next_statement )
{
   if (!pvalCheckType(p, "pvalGlobalsWalkStatements", PV_GLOBALS))
      return 0;
   if (!next_statement) {
      *next_statement = p;
      return p;
   } else {
      *next_statement = (*next_statement)->next;
      return (*next_statement)->next;
   }
}


void pvalTopLevAddObject( pval *p, pval *contextOrObj )
{
   if (p) {
      linku1(p,contextOrObj);
   } else {
      ast_log(LOG_ERROR, "First arg to pvalTopLevel is NULL!\n");
   }
}

pval *pvalTopLevWalkObjects(pval *p, pval **next_obj )
{
   if (!next_obj) {
      *next_obj = p;
      return p;
   } else {
      *next_obj = (*next_obj)->next;
      return (*next_obj)->next;
   }
}

/* append second element to the list in the first one via next pointers */
pval * linku1(pval *head, pval *tail)
{
   if (!head)
      return tail;
   if (tail) {
      if (!head->next) {
         head->next = tail;
      } else {
         head->u1_last->next = tail;
      }
      head->u1_last = tail;
      tail->prev = head; /* the dad link only points to containers */
   }
   return head;
}