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 # ifndef FLEX_STD 53 # define FLEX_STD std:: 54 # endif 55 56 extern "C++" { 57 58 struct yy_buffer_state; 59 typedef int yy_state_type; 60 61 class FlexLexer { 62 public: ~FlexLexer()63 virtual ~FlexLexer() { } 64 YYText()65 const char* YYText() const { return yytext; } YYLeng()66 int YYLeng() const { return yyleng; } 67 68 virtual void 69 yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0; 70 virtual struct yy_buffer_state* 71 yy_create_buffer( FLEX_STD istream* s, int size ) = 0; 72 virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0; 73 virtual void yyrestart( FLEX_STD istream* s ) = 0; 74 75 virtual int yylex() = 0; 76 77 // Call yylex with new input/output sources. 78 int yylex( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 ) 79 { 80 switch_streams( new_in, new_out ); 81 return yylex(); 82 } 83 84 // Switch to new input/output streams. A nil stream pointer 85 // indicates "keep the current one". 86 virtual void switch_streams( FLEX_STD istream* new_in = 0, 87 FLEX_STD ostream* new_out = 0 ) = 0; 88 lineno()89 int lineno() const { return yylineno; } 90 debug()91 int debug() const { return yy_flex_debug; } set_debug(int flag)92 void set_debug( int flag ) { yy_flex_debug = flag; } 93 94 protected: 95 char* yytext; 96 int yyleng; 97 int yylineno; // only maintained if you use %option yylineno 98 int yy_flex_debug; // only has effect with -d or "%option debug" 99 }; 100 101 } 102 #endif // FLEXLEXER_H 103 104 #if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce) 105 // Either this is the first time through (yyFlexLexerOnce not defined), 106 // or this is a repeated include to define a different flavor of 107 // yyFlexLexer, as discussed in the flex manual. 108 #define yyFlexLexerOnce 109 110 extern "C++" { 111 112 class yyFlexLexer : public FlexLexer { 113 public: 114 // arg_yyin and arg_yyout default to the cin and cout, but we 115 // only make that assignment when initializing in yylex(). 116 yyFlexLexer( FLEX_STD istream* arg_yyin = 0, FLEX_STD ostream* arg_yyout = 0 ); 117 118 virtual ~yyFlexLexer(); 119 120 void yy_switch_to_buffer( struct yy_buffer_state* new_buffer ); 121 struct yy_buffer_state* yy_create_buffer( FLEX_STD istream* s, int size ); 122 void yy_delete_buffer( struct yy_buffer_state* b ); 123 void yyrestart( FLEX_STD istream* s ); 124 125 void yypush_buffer_state( struct yy_buffer_state* new_buffer ); 126 void yypop_buffer_state(); 127 128 virtual int yylex(); 129 virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 ); 130 virtual int yywrap(); 131 132 protected: 133 virtual int LexerInput( char* buf, int max_size ); 134 virtual void LexerOutput( const char* buf, int size ); 135 virtual void LexerError( const char* msg ); 136 137 void yyunput( int c, char* buf_ptr ); 138 int yyinput(); 139 140 void yy_load_buffer_state(); 141 void yy_init_buffer( struct yy_buffer_state* b, FLEX_STD istream* s ); 142 void yy_flush_buffer( struct yy_buffer_state* b ); 143 144 int yy_start_stack_ptr; 145 int yy_start_stack_depth; 146 int* yy_start_stack; 147 148 void yy_push_state( int new_state ); 149 void yy_pop_state(); 150 int yy_top_state(); 151 152 yy_state_type yy_get_previous_state(); 153 yy_state_type yy_try_NUL_trans( yy_state_type current_state ); 154 int yy_get_next_buffer(); 155 156 FLEX_STD istream* yyin; // input source for default LexerInput 157 FLEX_STD ostream* yyout; // output sink for default LexerOutput 158 159 // yy_hold_char holds the character lost when yytext is formed. 160 char yy_hold_char; 161 162 // Number of characters read into yy_ch_buf. 163 int yy_n_chars; 164 165 // Points to current character in buffer. 166 char* yy_c_buf_p; 167 168 int yy_init; // whether we need to initialize 169 int yy_start; // start state number 170 171 // Flag which is used to allow yywrap()'s to do buffer switches 172 // instead of setting up a fresh yyin. A bit of a hack ... 173 int yy_did_buffer_switch_on_eof; 174 175 176 size_t yy_buffer_stack_top; /**< index of top of stack. */ 177 size_t yy_buffer_stack_max; /**< capacity of stack. */ 178 struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */ 179 void yyensure_buffer_stack(void); 180 181 // The following are not always needed, but may be depending 182 // on use of certain flex features (like REJECT or yymore()). 183 184 yy_state_type yy_last_accepting_state; 185 char* yy_last_accepting_cpos; 186 187 yy_state_type* yy_state_buf; 188 yy_state_type* yy_state_ptr; 189 190 char* yy_full_match; 191 int* yy_full_state; 192 int yy_full_lp; 193 194 int yy_lp; 195 int yy_looking_for_trail_begin; 196 197 int yy_more_flag; 198 int yy_more_len; 199 int yy_more_offset; 200 int yy_prev_more_offset; 201 }; 202 203 } 204 205 #endif // yyFlexLexer || ! yyFlexLexerOnce 206 207