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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_ */