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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 "src/common.h"
#include "src/lexer-source-line-finder.h"
#include "src/literal.h"
#include "src/make-unique.h"
#include "src/opcode.h"
#include "src/token.h"
namespace wabt {
class ErrorHandler;
class LexerSource;
class WastParser;
class WastLexer {
public:
WABT_DISALLOW_COPY_AND_ASSIGN(WastLexer);
WastLexer(std::unique_ptr<LexerSource> source, string_view filename);
// Convenience functions.
static std::unique_ptr<WastLexer> CreateBufferLexer(string_view filename,
const void* data,
size_t size);
Token GetToken(WastParser* parser);
// TODO(binji): Move this out of the lexer.
std::unique_ptr<LexerSourceLineFinder> MakeLineFinder() {
return MakeUnique<LexerSourceLineFinder>(source_->Clone());
}
private:
static const int kEof = -1;
enum class CharClass { Reserved = 1, Keyword = 2, HexDigit = 4, Digit = 8 };
Location GetLocation();
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(string_view);
void Newline();
bool ReadBlockComment(WastParser*); // 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 IsReserved(int c) { return IsCharClass(c, CharClass::Reserved); }
bool ReadNum();
bool ReadHexNum();
int ReadReservedChars();
bool NoTrailingReservedChars() { return ReadReservedChars() == 0; }
void ReadSign();
Token GetStringToken(WastParser*);
Token GetNumberToken(TokenType);
Token GetHexNumberToken(TokenType);
Token GetInfToken();
Token GetNanToken();
Token GetNameEqNumToken(string_view name, TokenType);
Token GetIdToken();
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_;
};
} // namespace wabt
#endif /* WABT_WAST_LEXER_H_ */
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