comparison: src/lexer.h
src/lexer.h
- changeset 88
- 5def6ff8b466
- parent 87
- 8f65914e7046
- child 89
- 029a330a9bef
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| 87:8f65914e7046 | 88:5def6ff8b466 |
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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 "lexer_scanner.h" | |
| 34 | |
| 35 class lexer | |
| 36 { | |
| 37 types: | |
| 38 struct token | |
| 39 { | |
| 40 e_token type; | |
| 41 string text; | |
| 42 string file; | |
| 43 int line; | |
| 44 int column; | |
| 45 }; | |
| 46 | |
| 47 using token_list = list<token>; | |
| 48 using iterator = token_list::iterator; | |
| 49 | |
| 50 public: | |
| 51 lexer(); | |
| 52 ~lexer(); | |
| 53 | |
| 54 void process_file (string file_name); | |
| 55 bool get_next (e_token req = tk_any); | |
| 56 void must_get_next (e_token tok = tk_any); | |
| 57 void must_get_any_of (const list<e_token>& toks); | |
| 58 int get_one_symbol (const string_list& syms); | |
| 59 void must_be (e_token tok); | |
| 60 bool peek_next (token* tk = null); | |
| 61 | |
| 62 inline bool has_valid_token() const | |
| 63 { | |
| 64 return (m_token_position < m_tokens.end() && m_token_position >= m_tokens.begin()); | |
| 65 } | |
| 66 | |
| 67 inline token* get_token() const | |
| 68 { | |
| 69 assert (has_valid_token() == true); | |
| 70 return &(*m_token_position); | |
| 71 } | |
| 72 | |
| 73 inline bool is_at_end() const | |
| 74 { | |
| 75 return m_token_position == m_tokens.end(); | |
| 76 } | |
| 77 | |
| 78 inline e_token get_token_type() const | |
| 79 { | |
| 80 return get_token()->type; | |
| 81 } | |
| 82 | |
| 83 // If @tok is given, describes the token. If not, describes @tok_type. | |
| 84 static inline string describe_token_type (e_token tok_type) | |
| 85 { | |
| 86 return describe_token_private (tok_type, null); | |
| 87 } | |
| 88 | |
| 89 static inline string describe_token (token* tok) | |
| 90 { | |
| 91 return describe_token_private (tok->type, tok); | |
| 92 } | |
| 93 | |
| 94 static lexer* get_current_lexer(); | |
| 95 | |
| 96 inline void skip (int a = 1) | |
| 97 { | |
| 98 m_token_position += a; | |
| 99 } | |
| 100 | |
| 101 string peek_next_string (int a = 1); | |
| 102 | |
| 103 private: | |
| 104 token_list m_tokens; | |
| 105 iterator m_token_position; | |
| 106 | |
| 107 // read a mandatory token from scanner | |
| 108 void must_get_next_from_scanner (lexer_scanner& sc, e_token tt = tk_any); | |
| 109 void check_file_header (lexer_scanner& sc); | |
| 110 | |
| 111 static string describe_token_private (e_token tok_type, token* tok); | |
| 112 }; | |
| 113 | |
| 114 #endif // BOTC_LEXER_H |
