1 /* $NetBSD: FlexLexer.h,v 1.3 2017/01/02 17:45:27 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 55 extern "C++" { 56 57 struct yy_buffer_state; 58 typedef int yy_state_type; 59 60 class FlexLexer 61 { 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( yy_buffer_state* new_buffer ) = 0; 70 virtual yy_buffer_state* yy_create_buffer( std::istream* s, int size ) = 0; 71 virtual yy_buffer_state* yy_create_buffer( std::istream& s, int size ) = 0; 72 virtual void yy_delete_buffer( yy_buffer_state* b ) = 0; 73 virtual void yyrestart( std::istream* s ) = 0; 74 virtual void yyrestart( std::istream& s ) = 0; 75 76 virtual int yylex() = 0; 77 78 // Call yylex with new input/output sources. yylex(std::istream & new_in,std::ostream & new_out)79 int yylex( std::istream& new_in, std::ostream& new_out ) 80 { 81 switch_streams( new_in, new_out ); 82 return yylex(); 83 } 84 85 int yylex( std::istream* new_in, std::ostream* new_out = 0) 86 { 87 switch_streams( new_in, new_out ); 88 return yylex(); 89 } 90 91 // Switch to new input/output streams. A nil stream pointer 92 // indicates "keep the current one". 93 virtual void switch_streams( std::istream* new_in, 94 std::ostream* new_out ) = 0; 95 virtual void switch_streams( std::istream& new_in, 96 std::ostream& new_out ) = 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( std::istream& arg_yyin, std::ostream& arg_yyout ); 126 yyFlexLexer( std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0 ); 127 private: 128 void ctor_common(); 129 130 public: 131 132 virtual ~yyFlexLexer(); 133 134 void yy_switch_to_buffer( yy_buffer_state* new_buffer ); 135 yy_buffer_state* yy_create_buffer( std::istream* s, int size ); 136 yy_buffer_state* yy_create_buffer( std::istream& s, int size ); 137 void yy_delete_buffer( yy_buffer_state* b ); 138 void yyrestart( std::istream* s ); 139 void yyrestart( std::istream& s ); 140 141 void yypush_buffer_state( yy_buffer_state* new_buffer ); 142 void yypop_buffer_state(); 143 144 virtual int yylex(); 145 virtual void switch_streams( std::istream& new_in, std::ostream& new_out ); 146 virtual void switch_streams( std::istream* new_in = 0, std::ostream* new_out = 0 ); 147 virtual int yywrap(); 148 149 protected: 150 virtual int LexerInput( char* buf, int max_size ); 151 virtual void LexerOutput( const char* buf, int size ); 152 virtual void LexerError( const char* msg ); 153 154 void yyunput( int c, char* buf_ptr ); 155 int yyinput(); 156 157 void yy_load_buffer_state(); 158 void yy_init_buffer( yy_buffer_state* b, std::istream& s ); 159 void yy_flush_buffer( yy_buffer_state* b ); 160 161 int yy_start_stack_ptr; 162 int yy_start_stack_depth; 163 int* yy_start_stack; 164 165 void yy_push_state( int new_state ); 166 void yy_pop_state(); 167 int yy_top_state(); 168 169 yy_state_type yy_get_previous_state(); 170 yy_state_type yy_try_NUL_trans( yy_state_type current_state ); 171 int yy_get_next_buffer(); 172 173 std::istream yyin; // input source for default LexerInput 174 std::ostream yyout; // output sink for default LexerOutput 175 176 // yy_hold_char holds the character lost when yytext is formed. 177 char yy_hold_char; 178 179 // Number of characters read into yy_ch_buf. 180 int yy_n_chars; 181 182 // Points to current character in buffer. 183 char* yy_c_buf_p; 184 185 int yy_init; // whether we need to initialize 186 int yy_start; // start state number 187 188 // Flag which is used to allow yywrap()'s to do buffer switches 189 // instead of setting up a fresh yyin. A bit of a hack ... 190 int yy_did_buffer_switch_on_eof; 191 192 193 size_t yy_buffer_stack_top; /**< index of top of stack. */ 194 size_t yy_buffer_stack_max; /**< capacity of stack. */ 195 yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */ 196 void yyensure_buffer_stack(void); 197 198 // The following are not always needed, but may be depending 199 // on use of certain flex features (like REJECT or yymore()). 200 201 yy_state_type yy_last_accepting_state; 202 char* yy_last_accepting_cpos; 203 204 yy_state_type* yy_state_buf; 205 yy_state_type* yy_state_ptr; 206 207 char* yy_full_match; 208 int* yy_full_state; 209 int yy_full_lp; 210 211 int yy_lp; 212 int yy_looking_for_trail_begin; 213 214 int yy_more_flag; 215 int yy_more_len; 216 int yy_more_offset; 217 int yy_prev_more_offset; 218 }; 219 220 } 221 222 #endif // yyFlexLexer || ! yyFlexLexerOnce 223