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