source: trunk/contrib/flex-2.5.35/include/FlexLexer.h @ 1465

Last change on this file since 1465 was 1419, checked in by sam, 9 years ago

orbital: a lot of scanner and parser refactoring to simplify the source
files and allow to build on MSVC soon.

  • Property svn:keywords set to Id
File size: 6.1 KB
Line 
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
56extern "C++" {
57
58struct yy_buffer_state;
59typedef int yy_state_type;
60
61class FlexLexer {
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( 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
94protected:
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
110extern "C++" {
111
112class yyFlexLexer : public FlexLexer {
113public:
114        // arg_yyin and arg_yyout default to the cin and cout, but we
115        // only make that assignment when initializing in yylex().
116        yyFlexLexer( FLEX_STD istream* arg_yyin = 0, FLEX_STD ostream* arg_yyout = 0 );
117
118        virtual ~yyFlexLexer();
119
120        void yy_switch_to_buffer( struct yy_buffer_state* new_buffer );
121        struct yy_buffer_state* yy_create_buffer( FLEX_STD istream* s, int size );
122        void yy_delete_buffer( struct yy_buffer_state* b );
123        void yyrestart( FLEX_STD istream* s );
124
125        void yypush_buffer_state( struct yy_buffer_state* new_buffer );
126        void yypop_buffer_state();
127
128        virtual int yylex();
129        virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 );
130        virtual int yywrap();
131
132protected:
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; /**< index of top of stack. */
177        size_t yy_buffer_stack_max; /**< capacity of stack. */
178        struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */
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 // yyFlexLexer || ! yyFlexLexerOnce
206
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