1//===- FlexLexer.h --------------------------------------------------------===//
2//
3//                     The MCLinker Project
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// -*-C++-*-
11// FlexLexer.h -- define interfaces for lexical analyzer classes generated
12// by flex
13
14// Copyright (c) 1993 The Regents of the University of California.
15// All rights reserved.
16//
17// This code is derived from software contributed to Berkeley by
18// Kent Williams and Tom Epperly.
19//
20//  Redistribution and use in source and binary forms, with or without
21//  modification, are permitted provided that the following conditions
22//  are met:
23
24//  1. Redistributions of source code must retain the above copyright
25//  notice, this list of conditions and the following disclaimer.
26//  2. Redistributions in binary form must reproduce the above copyright
27//  notice, this list of conditions and the following disclaimer in the
28//  documentation and/or other materials provided with the distribution.
29
30//  Neither the name of the University nor the names of its contributors
31//  may be used to endorse or promote products derived from this software
32//  without specific prior written permission.
33
34//  THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
35//  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
36//  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
37//  PURPOSE.
38
39// This file defines FlexLexer, an abstract class which specifies the
40// external interface provided to flex C++ lexer objects, and yyFlexLexer,
41// which defines a particular lexer class.
42//
43// If you want to create multiple lexer classes, you use the -P flag
44// to rename each yyFlexLexer to some other xxFlexLexer.  You then
45// include <FlexLexer.h> in your other sources once per lexer class:
46//
47//	#undef yyFlexLexer
48//	#define yyFlexLexer xxFlexLexer
49//	#include <FlexLexer.h>
50//
51//	#undef yyFlexLexer
52//	#define yyFlexLexer zzFlexLexer
53//	#include <FlexLexer.h>
54//	...
55
56#ifndef __FLEX_LEXER_H
57// Never included before - need to define base class.
58#define __FLEX_LEXER_H
59
60#include <iostream>
61#ifndef FLEX_STD
62#define FLEX_STD std::
63#endif
64
65extern "C++" {
66struct yy_buffer_state;
67typedef int yy_state_type;
68
69class FlexLexer {
70 public:
71  virtual ~FlexLexer() {}
72
73  const char* YYText() const { return yytext; }
74  int YYLeng() const { return yyleng; }
75
76  virtual void yy_switch_to_buffer(struct yy_buffer_state* new_buffer) = 0;
77  virtual struct yy_buffer_state* yy_create_buffer(FLEX_STD istream* s,
78                                                   int size) = 0;
79  virtual void yy_delete_buffer(struct yy_buffer_state* b) = 0;
80  virtual void yyrestart(FLEX_STD istream* s) = 0;
81
82  virtual int yylex() = 0;
83
84  // Call yylex with new input/output sources.
85  int yylex(FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0) {
86    switch_streams(new_in, new_out);
87    return yylex();
88  }
89
90  // Switch to new input/output streams.  A nil stream pointer
91  // indicates "keep the current one".
92  virtual void switch_streams(FLEX_STD istream* new_in = 0,
93                              FLEX_STD ostream* new_out = 0) = 0;
94
95  int lineno() const { return yylineno; }
96
97  int debug() const { return yy_flex_debug; }
98  void set_debug(int flag) { yy_flex_debug = flag; }
99
100 protected:
101  char* yytext;
102  int yyleng;
103  int yylineno;       // only maintained if you use %option yylineno
104  int yy_flex_debug;  // only has effect with -d or "%option debug"
105};
106}
107#endif  // FLEXLEXER_H
108
109#if defined(yyFlexLexer) || !defined(yyFlexLexerOnce)
110// Either this is the first time through (yyFlexLexerOnce not defined),
111// or this is a repeated include to define a different flavor of
112// yyFlexLexer, as discussed in the flex manual.
113#define yyFlexLexerOnce
114
115extern "C++" {
116class yyFlexLexer : public FlexLexer {
117 public:
118  // arg_yyin and arg_yyout default to the cin and cout, but we
119  // only make that assignment when initializing in yylex().
120  yyFlexLexer(FLEX_STD istream* arg_yyin = 0, FLEX_STD ostream* arg_yyout = 0);
121
122  virtual ~yyFlexLexer();
123
124  void yy_switch_to_buffer(struct yy_buffer_state* new_buffer);
125  struct yy_buffer_state* yy_create_buffer(FLEX_STD istream* s, int size);
126  void yy_delete_buffer(struct yy_buffer_state* b);
127  void yyrestart(FLEX_STD istream* s);
128
129  void yypush_buffer_state(struct yy_buffer_state* new_buffer);
130  void yypop_buffer_state();
131
132  virtual int yylex();
133  virtual void switch_streams(FLEX_STD istream* new_in,
134                              FLEX_STD ostream* new_out = 0);
135  virtual int yywrap();
136
137 protected:
138  virtual int LexerInput(char* buf, int max_size);
139  virtual void LexerOutput(const char* buf, int size);
140  virtual void LexerError(const char* msg);
141
142  void yyunput(int c, char* buf_ptr);
143  int yyinput();
144
145  void yy_load_buffer_state();
146  void yy_init_buffer(struct yy_buffer_state* b, FLEX_STD istream* s);
147  void yy_flush_buffer(struct yy_buffer_state* b);
148
149  int yy_start_stack_ptr;
150  int yy_start_stack_depth;
151  int* yy_start_stack;
152
153  void yy_push_state(int new_state);
154  void yy_pop_state();
155  int yy_top_state();
156
157  yy_state_type yy_get_previous_state();
158  yy_state_type yy_try_NUL_trans(yy_state_type current_state);
159  int yy_get_next_buffer();
160
161  FLEX_STD istream* yyin;   // input source for default LexerInput
162  FLEX_STD ostream* yyout;  // output sink for default LexerOutput
163
164  // yy_hold_char holds the character lost when yytext is formed.
165  char yy_hold_char;
166
167  // Number of characters read into yy_ch_buf.
168  int yy_n_chars;
169
170  // Points to current character in buffer.
171  char* yy_c_buf_p;
172
173  int yy_init;   // whether we need to initialize
174  int yy_start;  // start state number
175
176  // Flag which is used to allow yywrap()'s to do buffer switches
177  // instead of setting up a fresh yyin.  A bit of a hack ...
178  int yy_did_buffer_switch_on_eof;
179
180  size_t yy_buffer_stack_top;               /**< index of top of stack. */
181  size_t yy_buffer_stack_max;               /**< capacity of stack. */
182  struct yy_buffer_state** yy_buffer_stack; /**< Stack as an array. */
183  void yyensure_buffer_stack(void);
184
185  // The following are not always needed, but may be depending
186  // on use of certain flex features (like REJECT or yymore()).
187
188  yy_state_type yy_last_accepting_state;
189  char* yy_last_accepting_cpos;
190
191  yy_state_type* yy_state_buf;
192  yy_state_type* yy_state_ptr;
193
194  char* yy_full_match;
195  int* yy_full_state;
196  int yy_full_lp;
197
198  int yy_lp;
199  int yy_looking_for_trail_begin;
200
201  int yy_more_flag;
202  int yy_more_len;
203  int yy_more_offset;
204  int yy_prev_more_offset;
205};
206}
207
208#endif  // yyFlexLexer || ! yyFlexLexerOnce
209