1/*	$NetBSD: FlexLexer.h,v 1.3 2017/01/02 17:45:27 christos Exp $	*/
2
3// -*-C++-*-
4// FlexLexer.h -- define interfaces for lexical analyzer classes generated
5// by flex
6
7// Copyright (c) 1993 The Regents of the University of California.
8// All rights reserved.
9//
10// This code is derived from software contributed to Berkeley by
11// Kent Williams and Tom Epperly.
12//
13//  Redistribution and use in source and binary forms, with or without
14//  modification, are permitted provided that the following conditions
15//  are met:
16
17//  1. Redistributions of source code must retain the above copyright
18//  notice, this list of conditions and the following disclaimer.
19//  2. Redistributions in binary form must reproduce the above copyright
20//  notice, this list of conditions and the following disclaimer in the
21//  documentation and/or other materials provided with the distribution.
22
23//  Neither the name of the University nor the names of its contributors
24//  may be used to endorse or promote products derived from this software
25//  without specific prior written permission.
26
27//  THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
28//  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
29//  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30//  PURPOSE.
31
32// This file defines FlexLexer, an abstract class which specifies the
33// external interface provided to flex C++ lexer objects, and yyFlexLexer,
34// which defines a particular lexer class.
35//
36// If you want to create multiple lexer classes, you use the -P flag
37// to rename each yyFlexLexer to some other xxFlexLexer.  You then
38// include <FlexLexer.h> in your other sources once per lexer class:
39//
40//      #undef yyFlexLexer
41//      #define yyFlexLexer xxFlexLexer
42//      #include <FlexLexer.h>
43//
44//      #undef yyFlexLexer
45//      #define yyFlexLexer zzFlexLexer
46//      #include <FlexLexer.h>
47//      ...
48
49#ifndef __FLEX_LEXER_H
50// Never included before - need to define base class.
51#define __FLEX_LEXER_H
52
53#include <iostream>
54
55extern "C++" {
56
57struct yy_buffer_state;
58typedef int yy_state_type;
59
60class FlexLexer
61{
62public:
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( yy_buffer_state* new_buffer ) = 0;
70  virtual yy_buffer_state* yy_create_buffer( std::istream* s, int size ) = 0;
71  virtual yy_buffer_state* yy_create_buffer( std::istream& s, int size ) = 0;
72  virtual void yy_delete_buffer( yy_buffer_state* b ) = 0;
73  virtual void yyrestart( std::istream* s ) = 0;
74  virtual void yyrestart( std::istream& s ) = 0;
75
76  virtual int yylex() = 0;
77
78  // Call yylex with new input/output sources.
79  int yylex( std::istream& new_in, std::ostream& new_out )
80  {
81    switch_streams( new_in, new_out );
82    return yylex();
83  }
84
85  int yylex( std::istream* new_in, std::ostream* new_out = 0)
86  {
87    switch_streams( new_in, new_out );
88    return yylex();
89  }
90
91  // Switch to new input/output streams.  A nil stream pointer
92  // indicates "keep the current one".
93  virtual void switch_streams( std::istream* new_in,
94                               std::ostream* new_out ) = 0;
95  virtual void switch_streams( std::istream& new_in,
96                               std::ostream& new_out ) = 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( std::istream& arg_yyin, std::ostream& arg_yyout );
126  yyFlexLexer( std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0 );
127private:
128  void ctor_common();
129
130public:
131
132  virtual ~yyFlexLexer();
133
134  void yy_switch_to_buffer( yy_buffer_state* new_buffer );
135  yy_buffer_state* yy_create_buffer( std::istream* s, int size );
136  yy_buffer_state* yy_create_buffer( std::istream& s, int size );
137  void yy_delete_buffer( yy_buffer_state* b );
138  void yyrestart( std::istream* s );
139  void yyrestart( std::istream& s );
140
141  void yypush_buffer_state( yy_buffer_state* new_buffer );
142  void yypop_buffer_state();
143
144  virtual int yylex();
145  virtual void switch_streams( std::istream& new_in, std::ostream& new_out );
146  virtual void switch_streams( std::istream* new_in = 0, std::ostream* new_out = 0 );
147  virtual int yywrap();
148
149protected:
150  virtual int LexerInput( char* buf, int max_size );
151  virtual void LexerOutput( const char* buf, int size );
152  virtual void LexerError( const char* msg );
153
154  void yyunput( int c, char* buf_ptr );
155  int yyinput();
156
157  void yy_load_buffer_state();
158  void yy_init_buffer( yy_buffer_state* b, std::istream& s );
159  void yy_flush_buffer( yy_buffer_state* b );
160
161  int yy_start_stack_ptr;
162  int yy_start_stack_depth;
163  int* yy_start_stack;
164
165  void yy_push_state( int new_state );
166  void yy_pop_state();
167  int yy_top_state();
168
169  yy_state_type yy_get_previous_state();
170  yy_state_type yy_try_NUL_trans( yy_state_type current_state );
171  int yy_get_next_buffer();
172
173  std::istream yyin;  // input source for default LexerInput
174  std::ostream yyout; // output sink for default LexerOutput
175
176  // yy_hold_char holds the character lost when yytext is formed.
177  char yy_hold_char;
178
179  // Number of characters read into yy_ch_buf.
180  int yy_n_chars;
181
182  // Points to current character in buffer.
183  char* yy_c_buf_p;
184
185  int yy_init;                // whether we need to initialize
186  int yy_start;               // start state number
187
188  // Flag which is used to allow yywrap()'s to do buffer switches
189  // instead of setting up a fresh yyin.  A bit of a hack ...
190  int yy_did_buffer_switch_on_eof;
191
192
193  size_t yy_buffer_stack_top; /**< index of top of stack. */
194  size_t yy_buffer_stack_max; /**< capacity of stack. */
195  yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */
196  void yyensure_buffer_stack(void);
197
198  // The following are not always needed, but may be depending
199  // on use of certain flex features (like REJECT or yymore()).
200
201  yy_state_type yy_last_accepting_state;
202  char* yy_last_accepting_cpos;
203
204  yy_state_type* yy_state_buf;
205  yy_state_type* yy_state_ptr;
206
207  char* yy_full_match;
208  int* yy_full_state;
209  int yy_full_lp;
210
211  int yy_lp;
212  int yy_looking_for_trail_begin;
213
214  int yy_more_flag;
215  int yy_more_len;
216  int yy_more_offset;
217  int yy_prev_more_offset;
218};
219
220}
221
222#endif // yyFlexLexer || ! yyFlexLexerOnce
223