comparison: src/lexer_scanner.h
src/lexer_scanner.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_SCANNER_H | |
| 30 #define BOTC_LEXER_SCANNER_H | |
| 31 | |
| 32 #include <climits> | |
| 33 #include "main.h" | |
| 34 | |
| 35 class lexer_scanner | |
| 36 { | |
| 37 types: | |
| 38 struct position_info | |
| 39 { | |
| 40 char* pos; | |
| 41 char* line_break_pos; | |
| 42 int line; | |
| 43 }; | |
| 44 | |
| 45 // Flags for check_string() | |
| 46 enum | |
| 47 { | |
| 48 f_check_word = (1 << 0), // must be followed by whitespace | |
| 49 f_check_peek = (1 << 1), // don't advance cursor | |
| 50 }; | |
| 51 | |
| 52 public: | |
| 53 static inline bool is_symbol_char (char c, bool allow_numbers) | |
| 54 { | |
| 55 if (allow_numbers && (c >= '0' && c <= '9')) | |
| 56 return true; | |
| 57 | |
| 58 return (c >= 'a' && c <= 'z') || | |
| 59 (c >= 'A' && c <= 'Z') || | |
| 60 (c == '_'); | |
| 61 } | |
| 62 | |
| 63 lexer_scanner (FILE* fp); | |
| 64 ~lexer_scanner(); | |
| 65 bool get_next_token(); | |
| 66 string read_line(); | |
| 67 | |
| 68 inline const string& get_token_text() const | |
| 69 { | |
| 70 return m_token_text; | |
| 71 } | |
| 72 | |
| 73 inline int get_line() const | |
| 74 { | |
| 75 return m_line; | |
| 76 } | |
| 77 | |
| 78 inline int get_column() const | |
| 79 { | |
| 80 return m_ptr - m_line_break_pos; | |
| 81 } | |
| 82 | |
| 83 inline e_token get_token_type() const | |
| 84 { | |
| 85 return m_token_type; | |
| 86 } | |
| 87 | |
| 88 static string get_token_string (e_token a); | |
| 89 | |
| 90 private: | |
| 91 char* m_data; | |
| 92 char* m_ptr; | |
| 93 char* m_line_break_pos; | |
| 94 string m_token_text, | |
| 95 m_last_token; | |
| 96 e_token m_token_type; | |
| 97 int m_line; | |
| 98 | |
| 99 bool check_string (const char* c, int flags = 0); | |
| 100 | |
| 101 // Yields a copy of the current position information. | |
| 102 position_info get_position() const; | |
| 103 | |
| 104 // Sets the current position based on given data. | |
| 105 void set_position (const position_info& a); | |
| 106 | |
| 107 // Skips one character | |
| 108 void skip(); | |
| 109 | |
| 110 // Skips many characters | |
| 111 void skip (int chars); | |
| 112 }; | |
| 113 | |
| 114 #endif // BOTC_LEXER_SCANNER_H |
