Where Online Learning is simpler!

The C and C++ Include Header Files

cat -n /usr/include/wabt/wast-lexer.h

     1	/*
     2	 * Copyright 2016 WebAssembly Community Group participants
     3	 *
     4	 * Licensed under the Apache License, Version 2.0 (the "License");
     5	 * you may not use this file except in compliance with the License.
     6	 * You may obtain a copy of the License at
     7	 *
     8	 *     http://www.apache.org/licenses/LICENSE-2.0
     9	 *
    10	 * Unless required by applicable law or agreed to in writing, software
    11	 * distributed under the License is distributed on an "AS IS" BASIS,
    12	 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13	 * See the License for the specific language governing permissions and
    14	 * limitations under the License.
    15	 */
    16	
    17	#ifndef WABT_WAST_LEXER_H_
    18	#define WABT_WAST_LEXER_H_
    19	
    20	#include <cstddef>
    21	#include <cstdio>
    22	#include <memory>
    23	
    24	#include "wabt/common.h"
    25	#include "wabt/error.h"
    26	#include "wabt/lexer-source-line-finder.h"
    27	#include "wabt/literal.h"
    28	#include "wabt/opcode.h"
    29	#include "wabt/token.h"
    30	
    31	namespace wabt {
    32	
    33	class ErrorHandler;
    34	class LexerSource;
    35	
    36	class WastLexer {
    37	 public:
    38	  WABT_DISALLOW_COPY_AND_ASSIGN(WastLexer);
    39	
    40	  WastLexer(std::unique_ptr<LexerSource> source,
    41	            std::string_view filename,
    42	            Errors*);
    43	
    44	  // Convenience functions.
    45	  static std::unique_ptr<WastLexer> CreateBufferLexer(std::string_view filename,
    46	                                                      const void* data,
    47	                                                      size_t size,
    48	                                                      Errors*);
    49	
    50	  Token GetToken();
    51	
    52	  // TODO(binji): Move this out of the lexer.
    53	  std::unique_ptr<LexerSourceLineFinder> MakeLineFinder() {
    54	    return std::make_unique<LexerSourceLineFinder>(source_->Clone());
    55	  }
    56	
    57	 private:
    58	  static constexpr int kEof = -1;
    59	  enum class CharClass { IdChar = 1, Keyword = 2, HexDigit = 4, Digit = 8 };
    60	
    61	  Location GetLocation();
    62	  std::string_view GetText(size_t offset = 0);
    63	
    64	  Token BareToken(TokenType);
    65	  Token LiteralToken(TokenType, LiteralType);
    66	  Token TextToken(TokenType, size_t offset = 0);
    67	
    68	  int PeekChar();
    69	  int ReadChar();
    70	  bool MatchChar(char);
    71	  bool MatchString(std::string_view);
    72	  void Newline();
    73	  bool ReadBlockComment();             // Returns false if EOF.
    74	  bool ReadLineComment();              // Returns false if EOF.
    75	  void ReadWhitespace();
    76	
    77	  static bool IsCharClass(int c, CharClass);
    78	  static bool IsDigit(int c) { return IsCharClass(c, CharClass::Digit); }
    79	  static bool IsHexDigit(int c) { return IsCharClass(c, CharClass::HexDigit); }
    80	  static bool IsKeyword(int c) { return IsCharClass(c, CharClass::Keyword); }
    81	  static bool IsIdChar(int c) { return IsCharClass(c, CharClass::IdChar); }
    82	
    83	  bool ReadNum();
    84	  bool ReadHexNum();
    85	
    86	  enum class ReservedChars { None, Some, Id };
    87	  ReservedChars ReadReservedChars();
    88	  bool NoTrailingReservedChars() {
    89	    return ReadReservedChars() == ReservedChars::None;
    90	  }
    91	  void ReadSign();
    92	  Token GetStringToken();
    93	  Token GetNumberToken(TokenType);
    94	  Token GetHexNumberToken(TokenType);
    95	  Token GetInfToken();
    96	  Token GetNanToken();
    97	  Token GetNameEqNumToken(std::string_view name, TokenType);
    98	  Token GetIdChars();
    99	  Token GetKeywordToken();
   100	  Token GetReservedToken();
   101	
   102	  std::unique_ptr<LexerSource> source_;
   103	  std::string filename_;
   104	  int line_;
   105	  const char* buffer_;
   106	  const char* buffer_end_;
   107	  const char* line_start_;
   108	  const char* token_start_;
   109	  const char* cursor_;
   110	
   111	  Errors* errors_;
   112	  void WABT_PRINTF_FORMAT(3, 4) Error(Location, const char* format, ...);
   113	};
   114	
   115	}  // namespace wabt
   116	
   117	#endif /* WABT_WAST_LEXER_H_ */