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parser.cpp
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/**
* Copyright (c) 2008-2009 Facebook
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* See accompanying file LICENSE.txt.
*
* @author Marcel Laverdet
*/
#include "node.hpp"
#include "parser.hpp"
#ifdef DEBUG_BISON
extern int yydebug;
#endif
using namespace std;
using namespace fbjs;
void* fbjs_init_parser(fbjs_parse_extra* extra) {
// Initialize the scanner.
void* scanner;
yylex_init_extra(extra, &scanner);
extra->error = NULL;
extra->error_line = 0;
extra->terminated = false;
extra->lineno = 1;
extra->last_tok = 0;
extra->last_paren_tok = 0;
// Debug stuff
#ifdef DEBUG_BISON
yydebug = 1;
#endif
#ifdef DEBUG_FLEX
yyset_debug(1, scanner);
#endif
return scanner;
}
void fbjs_cleanup_parser(fbjs_parse_extra* extra, void* scanner) {
yylex_destroy(scanner);
if (extra->error != NULL) {
string error(extra->error);
free(extra->error);
throw ParseException(error, extra->error_line);
}
}
//
// Parse from a file
NodeProgram::NodeProgram(FILE* file, node_parse_enum opts /* = PARSE_NONE */) : Node(1) {
fbjs_parse_extra extra;
void* scanner = fbjs_init_parser(&extra);
extra.opts = opts;
yyrestart(file, scanner); // read from file
yyparse(scanner, this);
fbjs_cleanup_parser(&extra, scanner);
}
//
// Parser from a string
NodeProgram::NodeProgram(const char* str, node_parse_enum opts /* = PARSE_NONE */) : Node(1) {
fbjs_parse_extra extra;
void* scanner = fbjs_init_parser(&extra);
extra.opts = opts;
yy_scan_string(str, scanner); // read from string
yyparse(scanner, this);
fbjs_cleanup_parser(&extra, scanner);
}

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