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
53extern "C++" {
54
55struct yy_buffer_state;
56typedef int yy_state_type;
57
58class FlexLexer
59{
60public:
61  virtual ~FlexLexer()        { }
62
63  const char* YYText() const  { return yytext; }
64  int YYLeng()        const   { return yyleng; }
65
66  virtual void
67  yy_switch_to_buffer( yy_buffer_state* new_buffer ) = 0;
68  virtual yy_buffer_state* yy_create_buffer( std::istream* s, int size ) = 0;
69  virtual yy_buffer_state* yy_create_buffer( std::istream& s, int size ) = 0;
70  virtual void yy_delete_buffer( yy_buffer_state* b ) = 0;
71  virtual void yyrestart( std::istream* s ) = 0;
72  virtual void yyrestart( std::istream& s ) = 0;
73
74  virtual int yylex() = 0;
75
76  // Call yylex with new input/output sources.
77  int yylex( std::istream& new_in, std::ostream& new_out )
78  {
79    switch_streams( new_in, new_out );
80    return yylex();
81  }
82
83  int yylex( std::istream* new_in, std::ostream* new_out = 0)
84  {
85    switch_streams( new_in, new_out );
86    return yylex();
87  }
88
89  // Switch to new input/output streams.  A nil stream pointer
90  // indicates "keep the current one".
91  virtual void switch_streams( std::istream* new_in,
92                               std::ostream* new_out ) = 0;
93  virtual void switch_streams( std::istream& new_in,
94                               std::ostream& new_out ) = 0;
95
96  int lineno() const          { return yylineno; }
97
98  int debug() const           { return yy_flex_debug; }
99  void set_debug( int flag )  { yy_flex_debug = flag; }
100
101protected:
102  char* yytext;
103  int yyleng;
104  int yylineno;       // only maintained if you use %option yylineno
105  int yy_flex_debug;  // only has effect with -d or "%option debug"
106};
107
108}
109#endif // FLEXLEXER_H
110
111#if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce)
112// Either this is the first time through (yyFlexLexerOnce not defined),
113// or this is a repeated include to define a different flavor of
114// yyFlexLexer, as discussed in the flex manual.
115# define yyFlexLexerOnce
116
117extern "C++" {
118
119class yyFlexLexer : public FlexLexer {
120public:
121  // arg_yyin and arg_yyout default to the cin and cout, but we
122  // only make that assignment when initializing in yylex().
123  yyFlexLexer( std::istream& arg_yyin, std::ostream& arg_yyout );
124  yyFlexLexer( std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0 );
125private:
126  void ctor_common();
127
128public:
129
130  virtual ~yyFlexLexer();
131
132  void yy_switch_to_buffer( yy_buffer_state* new_buffer );
133  yy_buffer_state* yy_create_buffer( std::istream* s, int size );
134  yy_buffer_state* yy_create_buffer( std::istream& s, int size );
135  void yy_delete_buffer( yy_buffer_state* b );
136  void yyrestart( std::istream* s );
137  void yyrestart( std::istream& s );
138
139  void yypush_buffer_state( yy_buffer_state* new_buffer );
140  void yypop_buffer_state();
141
142  virtual int yylex();
143  virtual void switch_streams( std::istream& new_in, std::ostream& new_out );
144  virtual void switch_streams( std::istream* new_in = 0, std::ostream* new_out = 0 );
145  virtual int yywrap();
146
147protected:
148  virtual int LexerInput( char* buf, int max_size );
149  virtual void LexerOutput( const char* buf, int size );
150  virtual void LexerError( const char* msg );
151
152  void yyunput( int c, char* buf_ptr );
153  int yyinput();
154
155  void yy_load_buffer_state();
156  void yy_init_buffer( yy_buffer_state* b, std::istream& s );
157  void yy_flush_buffer( yy_buffer_state* b );
158
159  int yy_start_stack_ptr;
160  int yy_start_stack_depth;
161  int* yy_start_stack;
162
163  void yy_push_state( int new_state );
164  void yy_pop_state();
165  int yy_top_state();
166
167  yy_state_type yy_get_previous_state();
168  yy_state_type yy_try_NUL_trans( yy_state_type current_state );
169  int yy_get_next_buffer();
170
171  std::istream yyin;  // input source for default LexerInput
172  std::ostream yyout; // output sink for default LexerOutput
173
174  // yy_hold_char holds the character lost when yytext is formed.
175  char yy_hold_char;
176
177  // Number of characters read into yy_ch_buf.
178  int yy_n_chars;
179
180  // Points to current character in buffer.
181  char* yy_c_buf_p;
182
183  int yy_init;                // whether we need to initialize
184  int yy_start;               // start state number
185
186  // Flag which is used to allow yywrap()'s to do buffer switches
187  // instead of setting up a fresh yyin.  A bit of a hack ...
188  int yy_did_buffer_switch_on_eof;
189
190
191  size_t yy_buffer_stack_top; /**< index of top of stack. */
192  size_t yy_buffer_stack_max; /**< capacity of stack. */
193  yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */
194  void yyensure_buffer_stack(void);
195
196  // The following are not always needed, but may be depending
197  // on use of certain flex features (like REJECT or yymore()).
198
199  yy_state_type yy_last_accepting_state;
200  char* yy_last_accepting_cpos;
201
202  yy_state_type* yy_state_buf;
203  yy_state_type* yy_state_ptr;
204
205  char* yy_full_match;
206  int* yy_full_state;
207  int yy_full_lp;
208
209  int yy_lp;
210  int yy_looking_for_trail_begin;
211
212  int yy_more_flag;
213  int yy_more_len;
214  int yy_more_offset;
215  int yy_prev_more_offset;
216};
217
218}
219
220#endif // yyFlexLexer || ! yyFlexLexerOnce
221