FlexLexer.h revision 8ff673e0a04af20135485dc422bcba264e4c0510
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 65extern "C++" { 66 67struct yy_buffer_state; 68typedef int yy_state_type; 69 70class FlexLexer { 71public: 72 virtual ~FlexLexer() { } 73 74 const char* YYText() const { return yytext; } 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 98 int lineno() const { return yylineno; } 99 100 int debug() const { return yy_flex_debug; } 101 void set_debug( int flag ) { yy_flex_debug = flag; } 102 103protected: 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 119extern "C++" { 120 121class yyFlexLexer : public FlexLexer { 122public: 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 141protected: 142 virtual int LexerInput( char* buf, int max_size ); 143 virtual void LexerOutput( const char* buf, int size ); 144 /* BEGIN ANDROID WAR - Mac builds use size_t until we switch to prebuilts */ 145 virtual size_t LexerInput( char* buf, size_t max_size ); 146 virtual void LexerOutput( const char* buf, size_t size ); 147 /* END ANDROID WAR */ 148 virtual void LexerError( const char* msg ); 149 150 void yyunput( int c, char* buf_ptr ); 151 int yyinput(); 152 153 void yy_load_buffer_state(); 154 void yy_init_buffer( struct yy_buffer_state* b, FLEX_STD istream* s ); 155 void yy_flush_buffer( struct yy_buffer_state* b ); 156 157 int yy_start_stack_ptr; 158 int yy_start_stack_depth; 159 int* yy_start_stack; 160 161 void yy_push_state( int new_state ); 162 void yy_pop_state(); 163 int yy_top_state(); 164 165 yy_state_type yy_get_previous_state(); 166 yy_state_type yy_try_NUL_trans( yy_state_type current_state ); 167 int yy_get_next_buffer(); 168 169 FLEX_STD istream* yyin; // input source for default LexerInput 170 FLEX_STD ostream* yyout; // output sink for default LexerOutput 171 172 // yy_hold_char holds the character lost when yytext is formed. 173 char yy_hold_char; 174 175 // Number of characters read into yy_ch_buf. 176 int yy_n_chars; 177 178 // Points to current character in buffer. 179 char* yy_c_buf_p; 180 181 int yy_init; // whether we need to initialize 182 int yy_start; // start state number 183 184 // Flag which is used to allow yywrap()'s to do buffer switches 185 // instead of setting up a fresh yyin. A bit of a hack ... 186 int yy_did_buffer_switch_on_eof; 187 188 189 size_t yy_buffer_stack_top; /**< index of top of stack. */ 190 size_t yy_buffer_stack_max; /**< capacity of stack. */ 191 struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */ 192 void yyensure_buffer_stack(void); 193 194 // The following are not always needed, but may be depending 195 // on use of certain flex features (like REJECT or yymore()). 196 197 yy_state_type yy_last_accepting_state; 198 char* yy_last_accepting_cpos; 199 200 yy_state_type* yy_state_buf; 201 yy_state_type* yy_state_ptr; 202 203 char* yy_full_match; 204 int* yy_full_state; 205 int yy_full_lp; 206 207 int yy_lp; 208 int yy_looking_for_trail_begin; 209 210 int yy_more_flag; 211 int yy_more_len; 212 int yy_more_offset; 213 int yy_prev_more_offset; 214}; 215 216} 217 218#endif // yyFlexLexer || ! yyFlexLexerOnce 219 220