contrib/flex/FlexLexer.h

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