comparison: src/lexer.h
src/lexer.h
- changeset 119
- bdf8d46c145f
- child 125
- 85814c0918c5
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| 118:e3361cf7cbf4 | 119:bdf8d46c145f |
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| 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 public: | |
| 38 struct TokenInfo | |
| 39 { | |
| 40 ETokenType type; | |
| 41 String text; | |
| 42 String file; | |
| 43 int line; | |
| 44 int column; | |
| 45 }; | |
| 46 | |
| 47 using TokenList = List<TokenInfo>; | |
| 48 using Iterator = TokenList::Iterator; | |
| 49 | |
| 50 public: | |
| 51 Lexer(); | |
| 52 ~Lexer(); | |
| 53 | |
| 54 void processFile (String fileName); | |
| 55 bool next (ETokenType req = TK_Any); | |
| 56 void mustGetNext (ETokenType tok); | |
| 57 void mustGetAnyOf (const List<ETokenType>& toks); | |
| 58 void mustGetSymbol (const String& a); | |
| 59 int getOneSymbol (const StringList& syms); | |
| 60 void tokenMustBe (ETokenType tok); | |
| 61 bool peekNext (TokenInfo* tk = null); | |
| 62 bool peekNextType (ETokenType req); | |
| 63 String peekNextString (int a = 1); | |
| 64 String describeCurrentPosition(); | |
| 65 String describeTokenPosition(); | |
| 66 | |
| 67 static Lexer* getCurrentLexer(); | |
| 68 | |
| 69 inline bool hasValidToken() const | |
| 70 { | |
| 71 return (m_tokenPosition < m_tokens.end() && m_tokenPosition >= m_tokens.begin()); | |
| 72 } | |
| 73 | |
| 74 inline TokenInfo* token() const | |
| 75 { | |
| 76 assert (hasValidToken() == true); | |
| 77 return &(*m_tokenPosition); | |
| 78 } | |
| 79 | |
| 80 inline bool isAtEnd() const | |
| 81 { | |
| 82 return m_tokenPosition == m_tokens.end(); | |
| 83 } | |
| 84 | |
| 85 inline ETokenType tokenType() const | |
| 86 { | |
| 87 return token()->type; | |
| 88 } | |
| 89 | |
| 90 inline void skip (int a = 1) | |
| 91 { | |
| 92 m_tokenPosition += a; | |
| 93 } | |
| 94 | |
| 95 inline int position() | |
| 96 { | |
| 97 return m_tokenPosition - m_tokens.begin(); | |
| 98 } | |
| 99 | |
| 100 inline void setPosition (int pos) | |
| 101 { | |
| 102 m_tokenPosition = m_tokens.begin() + pos; | |
| 103 } | |
| 104 | |
| 105 // If @tok is given, describes the token. If not, describes @tok_type. | |
| 106 static inline String describeTokenType (ETokenType toktype) | |
| 107 { | |
| 108 return describeTokenPrivate (toktype, null); | |
| 109 } | |
| 110 | |
| 111 static inline String describeToken (TokenInfo* tok) | |
| 112 { | |
| 113 return describeTokenPrivate (tok->type, tok); | |
| 114 } | |
| 115 | |
| 116 private: | |
| 117 TokenList m_tokens; | |
| 118 Iterator m_tokenPosition; | |
| 119 | |
| 120 // read a mandatory token from scanner | |
| 121 void mustGetFromScanner (LexerScanner& sc, ETokenType tt =TK_Any); | |
| 122 void checkFileHeader (LexerScanner& sc); | |
| 123 | |
| 124 static String describeTokenPrivate (ETokenType tok_type, TokenInfo* tok); | |
| 125 }; | |
| 126 | |
| 127 #endif // BOTC_LEXER_H |
