1 /* $NetBSD: FlexLexer.h,v 1.2 2014/10/29 18:28:36 christos Exp $ */ 2 3 // -*-C++-*- 4 // FlexLexer.h -- define interfaces for lexical analyzer classes generated 5 // by flex 6 7 // Copyright (c) 1993 The Regents of the University of California. 8 // All rights reserved. 9 // 10 // This code is derived from software contributed to Berkeley by 11 // Kent Williams and Tom Epperly. 12 // 13 // Redistribution and use in source and binary forms, with or without 14 // modification, are permitted provided that the following conditions 15 // are met: 16 17 // 1. Redistributions of source code must retain the above copyright 18 // notice, this list of conditions and the following disclaimer. 19 // 2. Redistributions in binary form must reproduce the above copyright 20 // notice, this list of conditions and the following disclaimer in the 21 // documentation and/or other materials provided with the distribution. 22 23 // Neither the name of the University nor the names of its contributors 24 // may be used to endorse or promote products derived from this software 25 // without specific prior written permission. 26 27 // THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 28 // IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 29 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 // PURPOSE. 31 32 // This file defines FlexLexer, an abstract class which specifies the 33 // external interface provided to flex C++ lexer objects, and yyFlexLexer, 34 // which defines a particular lexer class. 35 // 36 // If you want to create multiple lexer classes, you use the -P flag 37 // to rename each yyFlexLexer to some other xxFlexLexer. You then 38 // include <FlexLexer.h> in your other sources once per lexer class: 39 // 40 // #undef yyFlexLexer 41 // #define yyFlexLexer xxFlexLexer 42 // #include <FlexLexer.h> 43 // 44 // #undef yyFlexLexer 45 // #define yyFlexLexer zzFlexLexer 46 // #include <FlexLexer.h> 47 // ... 48 49 #ifndef __FLEX_LEXER_H 50 // Never included before - need to define base class. 51 #define __FLEX_LEXER_H 52 53 #include <iostream> 54 # ifndef FLEX_STD 55 # define FLEX_STD std:: 56 # endif 57 58 extern "C++" { 59 60 struct yy_buffer_state; 61 typedef int yy_state_type; 62 63 class FlexLexer { 64 public: ~FlexLexer()65 virtual ~FlexLexer() { } 66 YYText()67 const char* YYText() const { return yytext; } YYLeng()68 int YYLeng() const { return yyleng; } 69 70 virtual void 71 yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0; 72 virtual struct yy_buffer_state* 73 yy_create_buffer( FLEX_STD istream* s, int size ) = 0; 74 virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0; 75 virtual void yyrestart( FLEX_STD istream* s ) = 0; 76 77 virtual int yylex() = 0; 78 79 // Call yylex with new input/output sources. 80 int yylex( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 ) 81 { 82 switch_streams( new_in, new_out ); 83 return yylex(); 84 } 85 86 // Switch to new input/output streams. A nil stream pointer 87 // indicates "keep the current one". 88 virtual void switch_streams( FLEX_STD istream* new_in = 0, 89 FLEX_STD ostream* new_out = 0 ) = 0; 90 lineno()91 int lineno() const { return yylineno; } 92 debug()93 int debug() const { return yy_flex_debug; } set_debug(int flag)94 void set_debug( int flag ) { yy_flex_debug = flag; } 95 96 protected: 97 char* yytext; 98 int yyleng; 99 int yylineno; // only maintained if you use %option yylineno 100 int yy_flex_debug; // only has effect with -d or "%option debug" 101 }; 102 103 } 104 #endif // FLEXLEXER_H 105 106 #if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce) 107 // Either this is the first time through (yyFlexLexerOnce not defined), 108 // or this is a repeated include to define a different flavor of 109 // yyFlexLexer, as discussed in the flex manual. 110 #define yyFlexLexerOnce 111 112 extern "C++" { 113 114 class yyFlexLexer : public FlexLexer { 115 public: 116 // arg_yyin and arg_yyout default to the cin and cout, but we 117 // only make that assignment when initializing in yylex(). 118 yyFlexLexer( FLEX_STD istream* arg_yyin = 0, FLEX_STD ostream* arg_yyout = 0 ); 119 120 virtual ~yyFlexLexer(); 121 122 void yy_switch_to_buffer( struct yy_buffer_state* new_buffer ); 123 struct yy_buffer_state* yy_create_buffer( FLEX_STD istream* s, int size ); 124 void yy_delete_buffer( struct yy_buffer_state* b ); 125 void yyrestart( FLEX_STD istream* s ); 126 127 void yypush_buffer_state( struct yy_buffer_state* new_buffer ); 128 void yypop_buffer_state(); 129 130 virtual int yylex(); 131 virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 ); 132 virtual int yywrap(); 133 134 protected: 135 virtual int LexerInput( char* buf, int max_size ); 136 virtual void LexerOutput( const char* buf, int size ); 137 virtual void LexerError( const char* msg ); 138 139 void yyunput( int c, char* buf_ptr ); 140 int yyinput(); 141 142 void yy_load_buffer_state(); 143 void yy_init_buffer( struct yy_buffer_state* b, FLEX_STD istream* s ); 144 void yy_flush_buffer( struct yy_buffer_state* b ); 145 146 int yy_start_stack_ptr; 147 int yy_start_stack_depth; 148 int* yy_start_stack; 149 150 void yy_push_state( int new_state ); 151 void yy_pop_state(); 152 int yy_top_state(); 153 154 yy_state_type yy_get_previous_state(); 155 yy_state_type yy_try_NUL_trans( yy_state_type current_state ); 156 int yy_get_next_buffer(); 157 158 FLEX_STD istream* yyin; // input source for default LexerInput 159 FLEX_STD ostream* yyout; // output sink for default LexerOutput 160 161 // yy_hold_char holds the character lost when yytext is formed. 162 char yy_hold_char; 163 164 // Number of characters read into yy_ch_buf. 165 int yy_n_chars; 166 167 // Points to current character in buffer. 168 char* yy_c_buf_p; 169 170 int yy_init; // whether we need to initialize 171 int yy_start; // start state number 172 173 // Flag which is used to allow yywrap()'s to do buffer switches 174 // instead of setting up a fresh yyin. A bit of a hack ... 175 int yy_did_buffer_switch_on_eof; 176 177 178 size_t yy_buffer_stack_top; /**< index of top of stack. */ 179 size_t yy_buffer_stack_max; /**< capacity of stack. */ 180 struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */ 181 void yyensure_buffer_stack(void); 182 183 // The following are not always needed, but may be depending 184 // on use of certain flex features (like REJECT or yymore()). 185 186 yy_state_type yy_last_accepting_state; 187 char* yy_last_accepting_cpos; 188 189 yy_state_type* yy_state_buf; 190 yy_state_type* yy_state_ptr; 191 192 char* yy_full_match; 193 int* yy_full_state; 194 int yy_full_lp; 195 196 int yy_lp; 197 int yy_looking_for_trail_begin; 198 199 int yy_more_flag; 200 int yy_more_len; 201 int yy_more_offset; 202 int yy_prev_more_offset; 203 }; 204 205 } 206 207 #endif // yyFlexLexer || ! yyFlexLexerOnce 208 209