1 // -*-C++-*- 2 // FlexLexer.h -- define interfaces for lexical analyzer classes generated 3 // by flex 4 5 // Copyright (c) 1993 The Regents of the University of California. 6 // All rights reserved. 7 // 8 // This code is derived from software contributed to Berkeley by 9 // Kent Williams and Tom Epperly. 10 // 11 // Redistribution and use in source and binary forms, with or without 12 // modification, are permitted provided that the following conditions 13 // are met: 14 15 // 1. Redistributions of source code must retain the above copyright 16 // notice, this list of conditions and the following disclaimer. 17 // 2. Redistributions in binary form must reproduce the above copyright 18 // notice, this list of conditions and the following disclaimer in the 19 // documentation and/or other materials provided with the distribution. 20 21 // Neither the name of the University nor the names of its contributors 22 // may be used to endorse or promote products derived from this software 23 // without specific prior written permission. 24 25 // THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 26 // IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 27 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 // PURPOSE. 29 30 // This file defines FlexLexer, an abstract class which specifies the 31 // external interface provided to flex C++ lexer objects, and yyFlexLexer, 32 // which defines a particular lexer class. 33 // 34 // If you want to create multiple lexer classes, you use the -P flag 35 // to rename each yyFlexLexer to some other xxFlexLexer. You then 36 // include <FlexLexer.h> in your other sources once per lexer class: 37 // 38 // #undef yyFlexLexer 39 // #define yyFlexLexer xxFlexLexer 40 // #include <FlexLexer.h> 41 // 42 // #undef yyFlexLexer 43 // #define yyFlexLexer zzFlexLexer 44 // #include <FlexLexer.h> 45 // ... 46 47 #ifndef __FLEX_LEXER_H 48 // Never included before - need to define base class. 49 #define __FLEX_LEXER_H 50 51 #include <iostream> 52 53 extern "C++" { 54 55 struct yy_buffer_state; 56 typedef int yy_state_type; 57 58 class FlexLexer 59 { 60 public: 61 virtual ~FlexLexer() { } 62 63 const char* YYText() const { return yytext; } 64 int YYLeng() const { return yyleng; } 65 66 virtual void 67 yy_switch_to_buffer( yy_buffer_state* new_buffer ) = 0; 68 virtual yy_buffer_state* yy_create_buffer( std::istream* s, int size ) = 0; 69 virtual yy_buffer_state* yy_create_buffer( std::istream& s, int size ) = 0; 70 virtual void yy_delete_buffer( yy_buffer_state* b ) = 0; 71 virtual void yyrestart( std::istream* s ) = 0; 72 virtual void yyrestart( std::istream& s ) = 0; 73 74 virtual int yylex() = 0; 75 76 // Call yylex with new input/output sources. 77 int yylex( std::istream& new_in, std::ostream& new_out ) 78 { 79 switch_streams( new_in, new_out ); 80 return yylex(); 81 } 82 83 int yylex( std::istream* new_in, std::ostream* new_out = 0) 84 { 85 switch_streams( new_in, new_out ); 86 return yylex(); 87 } 88 89 // Switch to new input/output streams. A nil stream pointer 90 // indicates "keep the current one". 91 virtual void switch_streams( std::istream* new_in, 92 std::ostream* new_out ) = 0; 93 virtual void switch_streams( std::istream& new_in, 94 std::ostream& new_out ) = 0; 95 96 int lineno() const { return yylineno; } 97 98 int debug() const { return yy_flex_debug; } 99 void set_debug( int flag ) { yy_flex_debug = flag; } 100 101 protected: 102 char* yytext; 103 int yyleng; 104 int yylineno; // only maintained if you use %option yylineno 105 int yy_flex_debug; // only has effect with -d or "%option debug" 106 }; 107 108 } 109 #endif // FLEXLEXER_H 110 111 #if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce) 112 // Either this is the first time through (yyFlexLexerOnce not defined), 113 // or this is a repeated include to define a different flavor of 114 // yyFlexLexer, as discussed in the flex manual. 115 # define yyFlexLexerOnce 116 117 extern "C++" { 118 119 class yyFlexLexer : public FlexLexer { 120 public: 121 // arg_yyin and arg_yyout default to the cin and cout, but we 122 // only make that assignment when initializing in yylex(). 123 yyFlexLexer( std::istream& arg_yyin, std::ostream& arg_yyout ); 124 yyFlexLexer( std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0 ); 125 private: 126 void ctor_common(); 127 128 public: 129 130 virtual ~yyFlexLexer(); 131 132 void yy_switch_to_buffer( yy_buffer_state* new_buffer ); 133 yy_buffer_state* yy_create_buffer( std::istream* s, int size ); 134 yy_buffer_state* yy_create_buffer( std::istream& s, int size ); 135 void yy_delete_buffer( yy_buffer_state* b ); 136 void yyrestart( std::istream* s ); 137 void yyrestart( std::istream& s ); 138 139 void yypush_buffer_state( yy_buffer_state* new_buffer ); 140 void yypop_buffer_state(); 141 142 virtual int yylex(); 143 virtual void switch_streams( std::istream& new_in, std::ostream& new_out ); 144 virtual void switch_streams( std::istream* new_in = 0, std::ostream* new_out = 0 ); 145 virtual int yywrap(); 146 147 protected: 148 virtual int LexerInput( char* buf, int max_size ); 149 virtual void LexerOutput( const char* buf, int size ); 150 virtual void LexerError( const char* msg ); 151 152 void yyunput( int c, char* buf_ptr ); 153 int yyinput(); 154 155 void yy_load_buffer_state(); 156 void yy_init_buffer( yy_buffer_state* b, std::istream& s ); 157 void yy_flush_buffer( yy_buffer_state* b ); 158 159 int yy_start_stack_ptr; 160 int yy_start_stack_depth; 161 int* yy_start_stack; 162 163 void yy_push_state( int new_state ); 164 void yy_pop_state(); 165 int yy_top_state(); 166 167 yy_state_type yy_get_previous_state(); 168 yy_state_type yy_try_NUL_trans( yy_state_type current_state ); 169 int yy_get_next_buffer(); 170 171 std::istream yyin; // input source for default LexerInput 172 std::ostream yyout; // output sink for default LexerOutput 173 174 // yy_hold_char holds the character lost when yytext is formed. 175 char yy_hold_char; 176 177 // Number of characters read into yy_ch_buf. 178 int yy_n_chars; 179 180 // Points to current character in buffer. 181 char* yy_c_buf_p; 182 183 int yy_init; // whether we need to initialize 184 int yy_start; // start state number 185 186 // Flag which is used to allow yywrap()'s to do buffer switches 187 // instead of setting up a fresh yyin. A bit of a hack ... 188 int yy_did_buffer_switch_on_eof; 189 190 191 size_t yy_buffer_stack_top; /**< index of top of stack. */ 192 size_t yy_buffer_stack_max; /**< capacity of stack. */ 193 yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */ 194 void yyensure_buffer_stack(void); 195 196 // The following are not always needed, but may be depending 197 // on use of certain flex features (like REJECT or yymore()). 198 199 yy_state_type yy_last_accepting_state; 200 char* yy_last_accepting_cpos; 201 202 yy_state_type* yy_state_buf; 203 yy_state_type* yy_state_ptr; 204 205 char* yy_full_match; 206 int* yy_full_state; 207 int yy_full_lp; 208 209 int yy_lp; 210 int yy_looking_for_trail_begin; 211 212 int yy_more_flag; 213 int yy_more_len; 214 int yy_more_offset; 215 int yy_prev_more_offset; 216 }; 217 218 } 219 220 #endif // yyFlexLexer || ! yyFlexLexerOnce 221