scanner/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 {
 114 public:
 115     // arg_yyin and arg_yyout default to the cin and cout, but we
 116     // only make that assignment when initializing in yylex().
 117     yyFlexLexer(FLEX_STD istream* arg_yyin = 0,
 118                 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,
 132                                 FLEX_STD ostream* new_out);
 133
 134     // This fixes a compatibility problem between source generated by flex
 135     // 2.5.34 and 2.5.35: always define yywrap as a virtual function.
 136     virtual int yywrap();
 137
 138 protected:
 139     virtual int LexerInput(char* buf, int max_size);
 140     virtual void LexerOutput(const char* buf, int size);
 141     virtual void LexerError(const char* msg);
 142
 143     void yyunput(int c, char* buf_ptr);
 144     int yyinput();
 145
 146     void yy_load_buffer_state();
 147     void yy_init_buffer(struct yy_buffer_state* b, FLEX_STD istream* s);
 148     void yy_flush_buffer(struct yy_buffer_state* b);
 149
 150     int yy_start_stack_ptr;
 151     int yy_start_stack_depth;
 152     int* yy_start_stack;
 153
 154     void yy_push_state(int new_state);
 155     void yy_pop_state();
 156     int yy_top_state();
 157
 158     yy_state_type yy_get_previous_state();
 159     yy_state_type yy_try_NUL_trans(yy_state_type current_state);
 160     int yy_get_next_buffer();
 161
 162     FLEX_STD istream* yyin;     // input source for default LexerInput
 163     FLEX_STD ostream* yyout;    // output sink for default LexerOutput
 164
 165     // yy_hold_char holds the character lost when yytext is formed.
 166     char yy_hold_char;
 167
 168     // Number of characters read into yy_ch_buf.
 169     int yy_n_chars;
 170
 171     // Points to current character in buffer.
 172     char* yy_c_buf_p;
 173
 174     int yy_init;                // whether we need to initialize
 175     int yy_start;               // start state number
 176
 177     // Flag which is used to allow yywrap()'s to do buffer switches
 178     // instead of setting up a fresh yyin.  A bit of a hack ...
 179     int yy_did_buffer_switch_on_eof;
 180
 181
 182     size_t yy_buffer_stack_top; /**< index of top of stack. */
 183     size_t yy_buffer_stack_max; /**< capacity of stack. */
 184     struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */
 185     void yyensure_buffer_stack(void);
 186
 187     // The following are not always needed, but may be depending
 188     // on use of certain flex features (like REJECT or yymore()).
 189
 190     yy_state_type yy_last_accepting_state;
 191     char* yy_last_accepting_cpos;
 192
 193     yy_state_type* yy_state_buf;
 194     yy_state_type* yy_state_ptr;
 195
 196     char* yy_full_match;
 197     int* yy_full_state;
 198     int yy_full_lp;
 199
 200     int yy_lp;
 201     int yy_looking_for_trail_begin;
 202
 203     int yy_more_flag;
 204     int yy_more_len;
 205     int yy_more_offset;
 206     int yy_prev_more_offset;
 207 };
 208
 209 } // extern "C++"
 210
 211 #endif // yyFlexLexer || ! yyFlexLexerOnce