comparison: src/Lexer.h
src/Lexer.h
- changeset 88
- 5def6ff8b466
- child 89
- 029a330a9bef
equal
deleted
inserted
replaced
| 87:8f65914e7046 | 88:5def6ff8b466 |
|---|---|
| 1 /* | |
| 2 Copyright 2012-2014 Santeri Piippo | |
| 3 All rights reserved. | |
| 4 | |
| 5 Redistribution and use in source and binary forms, with or without | |
| 6 modification, are permitted provided that the following conditions | |
| 7 are met: | |
| 8 | |
| 9 1. Redistributions of source code must retain the above copyright | |
| 10 notice, this list of conditions and the following disclaimer. | |
| 11 2. Redistributions in binary form must reproduce the above copyright | |
| 12 notice, this list of conditions and the following disclaimer in the | |
| 13 documentation and/or other materials provided with the distribution. | |
| 14 3. The name of the author may not be used to endorse or promote products | |
| 15 derived from this software without specific prior written permission. | |
| 16 | |
| 17 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
| 18 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
| 19 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
| 20 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
| 21 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 22 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 23 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 24 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 26 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 */ | |
| 28 | |
| 29 #ifndef BOTC_LEXER_H | |
| 30 #define BOTC_LEXER_H | |
| 31 | |
| 32 #include "Main.h" | |
| 33 #include "LexerScanner.h" | |
| 34 | |
| 35 class Lexer | |
| 36 { | |
| 37 types: | |
| 38 struct Token | |
| 39 { | |
| 40 EToken type; | |
| 41 String text; | |
| 42 String file; | |
| 43 int line; | |
| 44 int column; | |
| 45 }; | |
| 46 | |
| 47 using TokenList = List<Token>; | |
| 48 using Iterator = TokenList::Iterator; | |
| 49 | |
| 50 public: | |
| 51 Lexer(); | |
| 52 ~Lexer(); | |
| 53 | |
| 54 void ProcessFile (String file_name); | |
| 55 bool GetNext (EToken req = tkAny); | |
| 56 void MustGetNext (EToken tok = tkAny); | |
| 57 void MustGetAnyOf (const List<EToken>& toks); | |
| 58 int GetOneSymbol (const StringList& syms); | |
| 59 void TokenMustBe (EToken tok); | |
| 60 bool PeekNext (Token* tk = null); | |
| 61 | |
| 62 inline bool HasValidToken() const | |
| 63 { | |
| 64 return (mTokenPosition < mTokens.end() && mTokenPosition >= mTokens.begin()); | |
| 65 } | |
| 66 | |
| 67 inline Token* GetToken() const | |
| 68 { | |
| 69 assert (HasValidToken() == true); | |
| 70 return &(*mTokenPosition); | |
| 71 } | |
| 72 | |
| 73 inline bool IsAtEnd() const | |
| 74 { | |
| 75 return mTokenPosition == mTokens.end(); | |
| 76 } | |
| 77 | |
| 78 inline EToken GetTokenType() const | |
| 79 { | |
| 80 return GetToken()->type; | |
| 81 } | |
| 82 | |
| 83 // If @tok is given, describes the token. If not, describes @tok_type. | |
| 84 static inline String DescribeTokenType (EToken toktype) | |
| 85 { | |
| 86 return DescribeTokenPrivate (toktype, null); | |
| 87 } | |
| 88 | |
| 89 static inline String DescribeToken (Token* tok) | |
| 90 { | |
| 91 return DescribeTokenPrivate (tok->type, tok); | |
| 92 } | |
| 93 | |
| 94 static Lexer* GetCurrentLexer(); | |
| 95 | |
| 96 inline void Skip (int a = 1) | |
| 97 { | |
| 98 mTokenPosition += a; | |
| 99 } | |
| 100 | |
| 101 String PeekNextString (int a = 1); | |
| 102 | |
| 103 private: | |
| 104 TokenList mTokens; | |
| 105 Iterator mTokenPosition; | |
| 106 | |
| 107 // read a mandatory token from scanner | |
| 108 void MustGetFromScanner (LexerScanner& sc, EToken tt = tkAny); | |
| 109 void CheckFileHeader (LexerScanner& sc); | |
| 110 | |
| 111 static String DescribeTokenPrivate (EToken tok_type, Token* tok); | |
| 112 }; | |
| 113 | |
| 114 #endif // BOTC_LEXER_H |
