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FlexLexer.h
1 
2 // -*-C++-*-
3 // FlexLexer.h -- define interfaces for lexical analyzer classes generated
4 // by flex
5 
6 // Copyright (c) 1993 The Regents of the University of California.
7 // All rights reserved.
8 //
9 // This code is derived from software contributed to Berkeley by
10 // Kent Williams and Tom Epperly.
11 //
12 // Redistribution and use in source and binary forms, with or without
13 // modification, are permitted provided that the following conditions
14 // are met:
15 
16 // 1. Redistributions of source code must retain the above copyright
17 // notice, this list of conditions and the following disclaimer.
18 // 2. Redistributions in binary form must reproduce the above copyright
19 // notice, this list of conditions and the following disclaimer in the
20 // documentation and/or other materials provided with the distribution.
21 
22 // Neither the name of the University nor the names of its contributors
23 // may be used to endorse or promote products derived from this software
24 // without specific prior written permission.
25 
26 // THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
27 // IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
28 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 // PURPOSE.
30 
31 // This file defines FlexLexer, an abstract class which specifies the
32 // external interface provided to flex C++ lexer objects, and yyFlexLexer,
33 // which defines a particular lexer class.
34 //
35 // If you want to create multiple lexer classes, you use the -P flag
36 // to rename each yyFlexLexer to some other xxFlexLexer. You then
37 // include <FlexLexer.h> in your other sources once per lexer class:
38 //
39 // #undef yyFlexLexer
40 // #define yyFlexLexer xxFlexLexer
41 // #include <FlexLexer.h>
42 //
43 // #undef yyFlexLexer
44 // #define yyFlexLexer zzFlexLexer
45 // #include <FlexLexer.h>
46 // ...
47 
48 #ifndef __FLEX_LEXER_H
49 // Never included before - need to define base class.
50 #define __FLEX_LEXER_H
51 
52 #include <iostream>
53 # ifndef FLEX_STD
54 # define FLEX_STD std::
55 # endif
56 
57 extern "C++" {
58 
59 struct yy_buffer_state;
60 typedef int yy_state_type;
61 
62 class FlexLexer {
63 public:
64  virtual ~FlexLexer() { }
65 
66  const char* YYText() const { return yytext; }
67  int YYLeng() const { return yyleng; }
68 
69  virtual void
70  yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0;
71  virtual struct yy_buffer_state*
72  yy_create_buffer( FLEX_STD istream* s, int size ) = 0;
73  virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0;
74  virtual void yyrestart( FLEX_STD istream* s ) = 0;
75 
76  virtual int yylex() = 0;
77 
78  // Call yylex with new input/output sources.
79  int yylex( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 )
80  {
81  switch_streams( new_in, new_out );
82  return yylex();
83  }
84 
85  // Switch to new input/output streams. A nil stream pointer
86  // indicates "keep the current one".
87  virtual void switch_streams( FLEX_STD istream* new_in = 0,
88  FLEX_STD ostream* new_out = 0 ) = 0;
89 
90  int lineno() const { return yylineno; }
91 
92  int debug() const { return yy_flex_debug; }
93  void set_debug( int flag ) { yy_flex_debug = flag; }
94 
95 protected:
96  char* yytext;
97  int yyleng;
98  int yylineno; // only maintained if you use %option yylineno
99  int yy_flex_debug; // only has effect with -d or "%option debug"
100 };
101 
102 }
103 #endif
104 
105 #if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce)
106 // Either this is the first time through (yyFlexLexerOnce not defined),
107 // or this is a repeated include to define a different flavor of
108 // yyFlexLexer, as discussed in the flex man page.
109 #define yyFlexLexerOnce
110 
111 extern "C++" {
112 
113 class yyFlexLexer : public FlexLexer {
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, FLEX_STD ostream* arg_yyout = 0 );
118 
119  virtual ~yyFlexLexer();
120 
121  void yy_switch_to_buffer( struct yy_buffer_state* new_buffer );
122  struct yy_buffer_state* yy_create_buffer( FLEX_STD istream* s, int size );
123  void yy_delete_buffer( struct yy_buffer_state* b );
124  void yyrestart( FLEX_STD istream* s );
125 
126  void yypush_buffer_state( struct yy_buffer_state* new_buffer );
127  void yypop_buffer_state(void);
128 
129  virtual int yylex();
130  virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out );
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;
177  size_t yy_buffer_stack_max;
178  struct yy_buffer_state ** yy_buffer_stack;
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

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