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/*
* Copyright 2016 WebAssembly Community Group participants
*
* 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.
*/
#ifndef WABT_WAST_LEXER_H_
#define WABT_WAST_LEXER_H_
#include <cstddef>
#include <cstdio>
#include <memory>
#include "common.h"
#include "interpreter.h"
#include "lexer-source-line-finder.h"
namespace wabt {
union Token;
struct WastParser;
class LexerSource;
class WastLexer {
public:
WastLexer(std::unique_ptr<LexerSource> source, const char* filename);
~WastLexer();
// Convenience functions.
static std::unique_ptr<WastLexer> CreateFileLexer(const char* filename);
static std::unique_ptr<WastLexer> CreateBufferLexer(const char* filename,
const void* data,
size_t size);
int GetToken(Token* lval, Location* loc, WastParser* parser);
Result Fill(Location* loc, WastParser* parser, size_t need);
LexerSourceLineFinder& line_finder() { return line_finder_; }
private:
struct Lookahead;
struct LexToken;
std::unique_ptr<LexerSource> source_;
LexerSourceLineFinder line_finder_;
const char* filename_;
int line_;
int comment_nesting_;
size_t buffer_file_offset_; // File offset of the start of the buffer.
size_t line_file_offset_; // File offset of the start of the current line.
Lookahead* lookahead_;
LexToken* token_;
// Lexing data needed by re2c.
bool eof_;
char* buffer_;
size_t buffer_size_;
char* marker_;
char* next_pos_;
char* cursor_;
char* limit_;
bool IsLookaheadLpar();
int PopLookaheadToken(Token* lval, Location* loc);
void PushLookaheadToken();
void SetLiteral(LiteralType typ);
void SetLocation(Location* Loc);
void SetLookaheadToken(int value);
void SetOpcode(Opcode opc);
void SetText();
void SetTextAt(size_t offset);
void SetToken(int value);
void SetType(Type ty);
WABT_DISALLOW_COPY_AND_ASSIGN(WastLexer);
};
} // namespace wabt
#endif /* WABT_WAST_LEXER_H_ */
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