1 /* 2 * Copyright (c) 2022 Huawei Device Co., Ltd. 3 * 4 * HDF is dual licensed: you can use it either under the terms of 5 * the GPL, or the BSD license, at your option. 6 * See the LICENSE file in the root of this repository for complete details. 7 */ 8 9 #ifndef OHOS_HDI_LEXER_H 10 #define OHOS_HDI_LEXER_H 11 12 #include <cstdlib> 13 #include <ctype.h> 14 #include <memory> 15 #include <unordered_map> 16 17 #include "lexer/token.h" 18 #include "util/file.h" 19 20 namespace OHOS { 21 namespace HDI { 22 class Lexer { 23 public: 24 enum class ParseMode { 25 DECL_MODE, 26 EXPR_MODE, 27 }; 28 29 Lexer(); 30 31 ~Lexer() = default; 32 33 bool Reset(const std::string &filePath); 34 GetFilePath()35 inline std::string GetFilePath() const 36 { 37 return (file_ != nullptr) ? file_->GetPath() : ""; 38 } 39 40 Token PeekToken(bool skipComment = true); 41 42 Token GetToken(bool skipComment = true); 43 44 void SkipCurrentLine(); 45 46 bool SkipCurrentLine(char untilChar); 47 48 void Skip(char untilChar); 49 50 void SkipToken(TokenType tokenType); 51 52 void SkipUntilToken(TokenType tokenType); 53 54 void SkipEof(); 55 SetParseMode(ParseMode mode)56 inline void SetParseMode(ParseMode mode) 57 { 58 mode_ = mode; 59 } 60 61 private: 62 void ReadToken(Token &token, bool skipComment = true); 63 64 void InitCurToken(Token &token); 65 66 void ReadId(Token &token); 67 68 void ReadNum(Token &token); 69 70 void ReadBinaryNum(Token &token); 71 72 void ReadOctNum(Token &token); 73 74 void ReadHexNum(Token &token); 75 76 void ReadDecNum(Token &token); 77 78 void ReadShiftLeftOp(Token &token); 79 80 void ReadShiftRightOp(Token &token); 81 82 void ReadPPlusOp(Token &token); 83 84 void ReadMMinusOp(Token &token); 85 86 void ReadComment(Token &token); 87 88 void ReadLineComment(Token &token); 89 90 void ReadBlockComment(Token &token); 91 92 void ReadSymbolToken(Token &token); 93 94 private: 95 std::string filePath_; 96 std::unique_ptr<File> file_; 97 98 ParseMode mode_; 99 bool havePeek_; 100 Token curToken_; 101 102 private: 103 using StrTokenTypeMap = std::unordered_map<std::string, TokenType>; 104 static StrTokenTypeMap keyWords_; 105 static StrTokenTypeMap symbols_; 106 }; 107 } // namespace HDI 108 } // namespace OHOS 109 110 #endif // OHOS_HDI_LEXER_H