FlexLexer.h (5862B)
1 /* $OpenBSD: FlexLexer.h,v 1.6 2004/02/03 21:20:17 espie Exp $ */ 2 3 // $Header: /cvs/src/usr.bin/lex/FlexLexer.h,v 1.6 2004/02/03 21:20:17 espie Exp $ 4 5 // FlexLexer.h -- define interfaces for lexical analyzer classes generated 6 // by flex 7 8 // Copyright (c) 1993 The Regents of the University of California. 9 // All rights reserved. 10 // 11 // This code is derived from software contributed to Berkeley by 12 // Kent Williams and Tom Epperly. 13 // 14 // Redistribution and use in source and binary forms, with or without 15 // modification, are permitted provided that the following conditions 16 // are met: 17 // 18 // 1. Redistributions of source code must retain the above copyright 19 // notice, this list of conditions and the following disclaimer. 20 // 2. Redistributions in binary form must reproduce the above copyright 21 // notice, this list of conditions and the following disclaimer in the 22 // documentation and/or other materials provided with the distribution. 23 // 24 // Neither the name of the University nor the names of its contributors 25 // may be used to endorse or promote products derived from this software 26 // without specific prior written permission. 27 // 28 // THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 29 // IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 30 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 31 // PURPOSE. 32 33 // This file defines FlexLexer, an abstract class which specifies the 34 // external interface provided to flex C++ lexer objects, and yyFlexLexer, 35 // which defines a particular lexer class. 36 // 37 // If you want to create multiple lexer classes, you use the -P flag 38 // to rename each yyFlexLexer to some other xxFlexLexer. You then 39 // include <FlexLexer.h> in your other sources once per lexer class: 40 // 41 // #undef yyFlexLexer 42 // #define yyFlexLexer xxFlexLexer 43 // #include <FlexLexer.h> 44 // 45 // #undef yyFlexLexer 46 // #define yyFlexLexer zzFlexLexer 47 // #include <FlexLexer.h> 48 // ... 49 50 #ifndef __FLEX_LEXER_H 51 // Never included before - need to define base class. 52 #define __FLEX_LEXER_H 53 54 55 #include <iostream> 56 extern "C++" { 57 struct yy_buffer_state; 58 typedef int yy_state_type; 59 60 class FlexLexer { 61 public: 62 virtual ~FlexLexer() { } 63 64 const char* YYText() { return yytext; } 65 int YYLeng() { return yyleng; } 66 67 virtual void 68 yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0; 69 virtual struct yy_buffer_state* 70 yy_create_buffer( std::istream* s, int size ) = 0; 71 virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 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 = 0 ) 78 { 79 switch_streams( new_in, new_out ); 80 return yylex(); 81 } 82 83 // Switch to new input/output streams. A nil stream pointer 84 // indicates "keep the current one". 85 virtual void switch_streams( std::istream* new_in = 0, 86 std::ostream* new_out = 0 ) = 0; 87 88 int lineno() const { return yylineno; } 89 90 int debug() const { return yy_flex_debug; } 91 void set_debug( int flag ) { yy_flex_debug = flag; } 92 93 protected: 94 char* yytext; 95 int yyleng; 96 int yylineno; // only maintained if you use %option yylineno 97 int yy_flex_debug; // only has effect with -d or "%option debug" 98 }; 99 100 } 101 #endif 102 103 #if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce) 104 // Either this is the first time through (yyFlexLexerOnce not defined), 105 // or this is a repeated include to define a different flavor of 106 // yyFlexLexer, as discussed in the flex man page. 107 #define yyFlexLexerOnce 108 109 class yyFlexLexer : public FlexLexer { 110 public: 111 // arg_yyin and arg_yyout default to the cin and cout, but we 112 // only make that assignment when initializing in yylex(). 113 yyFlexLexer( std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0 ); 114 115 virtual ~yyFlexLexer(); 116 117 void yy_switch_to_buffer( struct yy_buffer_state* new_buffer ); 118 struct yy_buffer_state* yy_create_buffer( std::istream* s, int size ); 119 void yy_delete_buffer( struct yy_buffer_state* b ); 120 void yyrestart( std::istream* s ); 121 122 virtual int yylex(); 123 virtual void switch_streams( std::istream* new_in, std::ostream* new_out ); 124 125 protected: 126 virtual int LexerInput( char* buf, int max_size ); 127 virtual void LexerOutput( const char* buf, int size ); 128 virtual void LexerError( const char* msg ); 129 130 void yyunput( int c, char* buf_ptr ); 131 int yyinput(); 132 133 void yy_load_buffer_state(); 134 void yy_init_buffer( struct yy_buffer_state* b, std::istream* s ); 135 void yy_flush_buffer( struct yy_buffer_state* b ); 136 137 int yy_start_stack_ptr; 138 int yy_start_stack_depth; 139 int* yy_start_stack; 140 141 void yy_push_state( int new_state ); 142 void yy_pop_state(); 143 int yy_top_state(); 144 145 yy_state_type yy_get_previous_state(); 146 yy_state_type yy_try_NUL_trans( yy_state_type current_state ); 147 int yy_get_next_buffer(); 148 149 std::istream* yyin; // input source for default LexerInput 150 std::ostream* yyout; // output sink for default LexerOutput 151 152 struct yy_buffer_state* yy_current_buffer; 153 154 // yy_hold_char holds the character lost when yytext is formed. 155 char yy_hold_char; 156 157 // Number of characters read into yy_ch_buf. 158 int yy_n_chars; 159 160 // Points to current character in buffer. 161 char* yy_c_buf_p; 162 163 int yy_init; // whether we need to initialize 164 int yy_start; // start state number 165 166 // Flag which is used to allow yywrap()'s to do buffer switches 167 // instead of setting up a fresh yyin. A bit of a hack ... 168 int yy_did_buffer_switch_on_eof; 169 170 // The following are not always needed, but may be depending 171 // on use of certain flex features (like REJECT or yymore()). 172 173 yy_state_type yy_last_accepting_state; 174 char* yy_last_accepting_cpos; 175 176 yy_state_type* yy_state_buf; 177 yy_state_type* yy_state_ptr; 178 179 char* yy_full_match; 180 int* yy_full_state; 181 int yy_full_lp; 182 183 int yy_lp; 184 int yy_looking_for_trail_begin; 185 186 int yy_more_flag; 187 int yy_more_len; 188 int yy_more_offset; 189 int yy_prev_more_offset; 190 }; 191 192 #endif