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 62 extern "C++" { 63 64 struct yy_buffer_state; 65 typedef int yy_state_type; 66 67 class FlexLexer 68 { 69 public: ~FlexLexer()70 virtual ~FlexLexer() { } 71 YYText()72 const char* YYText() const { return yytext; } YYLeng()73 int YYLeng() const { return yyleng; } 74 75 virtual void 76 yy_switch_to_buffer( yy_buffer_state* new_buffer ) = 0; 77 virtual yy_buffer_state* yy_create_buffer( std::istream* s, int size ) = 0; 78 virtual yy_buffer_state* yy_create_buffer( std::istream& s, int size ) = 0; 79 virtual void yy_delete_buffer( yy_buffer_state* b ) = 0; 80 virtual void yyrestart( std::istream* s ) = 0; 81 virtual void yyrestart( std::istream& s ) = 0; 82 83 virtual int yylex() = 0; 84 85 // Call yylex with new input/output sources. yylex(std::istream & new_in,std::ostream & new_out)86 int yylex( std::istream& new_in, std::ostream& new_out ) 87 { 88 switch_streams( new_in, new_out ); 89 return yylex(); 90 } 91 92 int yylex( std::istream* new_in, std::ostream* new_out = 0) 93 { 94 switch_streams( new_in, new_out ); 95 return yylex(); 96 } 97 98 // Switch to new input/output streams. A nil stream pointer 99 // indicates "keep the current one". 100 virtual void switch_streams( std::istream* new_in, 101 std::ostream* new_out ) = 0; 102 virtual void switch_streams( std::istream& new_in, 103 std::ostream& new_out ) = 0; 104 lineno()105 int lineno() const { return yylineno; } 106 debug()107 int debug() const { return yy_flex_debug; } set_debug(int flag)108 void set_debug( int flag ) { yy_flex_debug = flag; } 109 110 protected: 111 char* yytext; 112 int yyleng; 113 int yylineno; // only maintained if you use %option yylineno 114 int yy_flex_debug; // only has effect with -d or "%option debug" 115 }; 116 117 } 118 #endif // FLEXLEXER_H 119 120 #if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce) 121 // Either this is the first time through (yyFlexLexerOnce not defined), 122 // or this is a repeated include to define a different flavor of 123 // yyFlexLexer, as discussed in the flex manual. 124 # define yyFlexLexerOnce 125 126 extern "C++" { 127 128 class yyFlexLexer : public FlexLexer { 129 public: 130 // arg_yyin and arg_yyout default to the cin and cout, but we 131 // only make that assignment when initializing in yylex(). 132 yyFlexLexer( std::istream& arg_yyin, std::ostream& arg_yyout ); 133 yyFlexLexer( std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0 ); 134 private: 135 void ctor_common(); 136 137 public: 138 139 virtual ~yyFlexLexer(); 140 141 void yy_switch_to_buffer( yy_buffer_state* new_buffer ); 142 yy_buffer_state* yy_create_buffer( std::istream* s, int size ); 143 yy_buffer_state* yy_create_buffer( std::istream& s, int size ); 144 void yy_delete_buffer( yy_buffer_state* b ); 145 void yyrestart( std::istream* s ); 146 void yyrestart( std::istream& s ); 147 148 void yypush_buffer_state( yy_buffer_state* new_buffer ); 149 void yypop_buffer_state(); 150 151 virtual int yylex(); 152 virtual void switch_streams( std::istream& new_in, std::ostream& new_out ); 153 virtual void switch_streams( std::istream* new_in = 0, std::ostream* new_out = 0 ); 154 virtual int yywrap(); 155 156 protected: 157 virtual int LexerInput( char* buf, int max_size ); 158 virtual void LexerOutput( const char* buf, int size ); 159 virtual void LexerError( const char* msg ); 160 161 void yyunput( int c, char* buf_ptr ); 162 int yyinput(); 163 164 void yy_load_buffer_state(); 165 void yy_init_buffer( yy_buffer_state* b, std::istream& s ); 166 void yy_flush_buffer( yy_buffer_state* b ); 167 168 int yy_start_stack_ptr; 169 int yy_start_stack_depth; 170 int* yy_start_stack; 171 172 void yy_push_state( int new_state ); 173 void yy_pop_state(); 174 int yy_top_state(); 175 176 yy_state_type yy_get_previous_state(); 177 yy_state_type yy_try_NUL_trans( yy_state_type current_state ); 178 int yy_get_next_buffer(); 179 180 std::istream yyin; // input source for default LexerInput 181 std::ostream yyout; // output sink for default LexerOutput 182 183 // yy_hold_char holds the character lost when yytext is formed. 184 char yy_hold_char; 185 186 // Number of characters read into yy_ch_buf. 187 int yy_n_chars; 188 189 // Points to current character in buffer. 190 char* yy_c_buf_p; 191 192 int yy_init; // whether we need to initialize 193 int yy_start; // start state number 194 195 // Flag which is used to allow yywrap()'s to do buffer switches 196 // instead of setting up a fresh yyin. A bit of a hack ... 197 int yy_did_buffer_switch_on_eof; 198 199 200 size_t yy_buffer_stack_top; /**< index of top of stack. */ 201 size_t yy_buffer_stack_max; /**< capacity of stack. */ 202 yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */ 203 void yyensure_buffer_stack(void); 204 205 // The following are not always needed, but may be depending 206 // on use of certain flex features (like REJECT or yymore()). 207 208 yy_state_type yy_last_accepting_state; 209 char* yy_last_accepting_cpos; 210 211 yy_state_type* yy_state_buf; 212 yy_state_type* yy_state_ptr; 213 214 char* yy_full_match; 215 int* yy_full_state; 216 int yy_full_lp; 217 218 int yy_lp; 219 int yy_looking_for_trail_begin; 220 221 int yy_more_flag; 222 int yy_more_len; 223 int yy_more_offset; 224 int yy_prev_more_offset; 225 }; 226 227 } 228 229 #endif // yyFlexLexer || ! yyFlexLexerOnce 230