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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 "wabt/common.h"
#include "wabt/error.h"
#include "wabt/lexer-source-line-finder.h"
#include "wabt/literal.h"
#include "wabt/opcode.h"
#include "wabt/token.h"
namespace wabt {
class ErrorHandler;
class LexerSource;
class WastLexer {
public:
WABT_DISALLOW_COPY_AND_ASSIGN(WastLexer);
WastLexer(std::unique_ptr<LexerSource> source,
std::string_view filename,
Errors*);
// Convenience functions.
static std::unique_ptr<WastLexer> CreateBufferLexer(std::string_view filename,
const void* data,
size_t size,
Errors*);
Token GetToken();
// TODO(binji): Move this out of the lexer.
std::unique_ptr<LexerSourceLineFinder> MakeLineFinder() {
return std::make_unique<LexerSourceLineFinder>(source_->Clone());
}
private:
static constexpr int kEof = -1;
enum class CharClass { IdChar = 1, Keyword = 2, HexDigit = 4, Digit = 8 };
Location GetLocation();
std::string_view GetText(size_t offset = 0);
Token BareToken(TokenType);
Token LiteralToken(TokenType, LiteralType);
Token TextToken(TokenType, size_t offset = 0);
int PeekChar();
int ReadChar();
bool MatchChar(char);
bool MatchString(std::string_view);
void Newline();
bool ReadBlockComment(); // Returns false if EOF.
bool ReadLineComment(); // Returns false if EOF.
void ReadWhitespace();
static bool IsCharClass(int c, CharClass);
static bool IsDigit(int c) { return IsCharClass(c, CharClass::Digit); }
static bool IsHexDigit(int c) { return IsCharClass(c, CharClass::HexDigit); }
static bool IsKeyword(int c) { return IsCharClass(c, CharClass::Keyword); }
static bool IsIdChar(int c) { return IsCharClass(c, CharClass::IdChar); }
bool ReadNum();
bool ReadHexNum();
enum class ReservedChars { None, Some, Id };
ReservedChars ReadReservedChars();
bool NoTrailingReservedChars() {
return ReadReservedChars() == ReservedChars::None;
}
void ReadSign();
Token GetStringToken();
Token GetNumberToken(TokenType);
Token GetHexNumberToken(TokenType);
Token GetInfToken();
Token GetNanToken();
Token GetNameEqNumToken(std::string_view name, TokenType);
Token GetIdChars();
Token GetKeywordToken();
Token GetReservedToken();
std::unique_ptr<LexerSource> source_;
std::string filename_;
int line_;
const char* buffer_;
const char* buffer_end_;
const char* line_start_;
const char* token_start_;
const char* cursor_;
Errors* errors_;
void WABT_PRINTF_FORMAT(3, 4) Error(Location, const char* format, ...);
};
} // namespace wabt
#endif /* WABT_WAST_LEXER_H_ */
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