pval.c

asterisk 是一个很有知名度开源软件

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2006, Digium, Inc.
 *
 * Steve Murphy <[e-mail]>
 *
 * 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: 168747 $")

#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 int localized_pbx_load_module(void);

static char expr_output[2096];
#define AST_PBX_MAX_STACK  128

/* 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;