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- // $Header: /opt/vlysenkov/CVSROOT/arcadia/contrib/tools/flex-old/FlexLexer.h,v 1.2 2007-11-30 02:28:15 pg Exp $
- // FlexLexer.h -- define interfaces for lexical analyzer classes generated
- // by flex
- // Copyright (c) 1993 The Regents of the University of California.
- // All rights reserved.
- //
- // This code is derived from software contributed to Berkeley by
- // Kent Williams and Tom Epperly.
- //
- // Redistribution and use in source and binary forms with or without
- // modification are permitted provided that: (1) source distributions retain
- // this entire copyright notice and comment, and (2) distributions including
- // binaries display the following acknowledgement: ``This product includes
- // software developed by the University of California, Berkeley and its
- // contributors'' in the documentation or other materials provided with the
- // distribution and in all advertising materials mentioning features or use
- // of this software. Neither the name of the University nor the names of
- // its contributors may be used to endorse or promote products derived from
- // this software without specific prior written permission.
- // THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- // WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- // This file defines FlexLexer, an abstract class which specifies the
- // external interface provided to flex C++ lexer objects, and yyFlexLexer,
- // which defines a particular lexer class.
- //
- // If you want to create multiple lexer classes, you use the -P flag
- // to rename each yyFlexLexer to some other xxFlexLexer. You then
- // include <FlexLexer.h> in your other sources once per lexer class:
- //
- // #undef yyFlexLexer
- // #define yyFlexLexer xxFlexLexer
- // #include <FlexLexer.h>
- //
- // #undef yyFlexLexer
- // #define yyFlexLexer zzFlexLexer
- // #include <FlexLexer.h>
- // ...
- #ifndef __FLEX_LEXER_H
- // Never included before - need to define base class.
- #define __FLEX_LEXER_H
- #include <iostream>
- extern "C++" {
- struct yy_buffer_state;
- typedef int yy_state_type;
- class FlexLexer {
- public:
- virtual ~FlexLexer() { }
- const char* YYText() { return yytext; }
- int YYLeng() { return yyleng; }
- virtual void
- yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0;
- virtual struct yy_buffer_state*
- yy_create_buffer( std::istream* s, int size ) = 0;
- virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0;
- virtual void yyrestart( std::istream* s ) = 0;
- virtual int yylex() = 0;
- // Call yylex with new input/output sources.
- int yylex( std::istream* new_in, std::ostream* new_out = 0 )
- {
- switch_streams( new_in, new_out );
- return yylex();
- }
- // Switch to new input/output streams. A nil stream pointer
- // indicates "keep the current one".
- virtual void switch_streams( std::istream* new_in = 0,
- std::ostream* new_out = 0 ) = 0;
- int lineno() const { return yylineno; }
- int debug() const { return yy_flex_debug; }
- void set_debug( int flag ) { yy_flex_debug = flag; }
- protected:
- char* yytext;
- int yyleng;
- int yylineno; // only maintained if you use %option yylineno
- int yy_flex_debug; // only has effect with -d or "%option debug"
- };
- }
- #endif
- #if defined(yyFlexLexer) || !defined(yyFlexLexerOnce)
- // Either this is the first time through (yyFlexLexerOnce not defined),
- // or this is a repeated include to define a different flavor of
- // yyFlexLexer, as discussed in the flex man page.
- #define yyFlexLexerOnce
- #define NEED_REDEF_FLEX
- #if defined(yyFlexLexer)
- #if defined(oldyyFlexLexer) && (oldyyFlexLexer == yyFlexLexer)
- #undef NEED_REDEF_FLEX
- #else
- #define oldyyFlexLexer yyFlexLexer
- #endif
- #endif
- #endif
- #if defined(NEED_REDEF_FLEX)
- class yyFlexLexer : public FlexLexer {
- public:
- // arg_yyin and arg_yyout default to the cin and cout, but we
- // only make that assignment when initializing in yylex().
- yyFlexLexer( std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0 );
- virtual ~yyFlexLexer();
- void yy_switch_to_buffer( struct yy_buffer_state* new_buffer );
- struct yy_buffer_state* yy_create_buffer( std::istream* s, int size );
- void yy_delete_buffer( struct yy_buffer_state* b );
- void yyrestart( std::istream* s );
- virtual int yylex();
- virtual void switch_streams( std::istream* new_in, std::ostream* new_out );
- protected:
- virtual int LexerInput( char* buf, int max_size );
- virtual void LexerOutput( const char* buf, int size );
- virtual void LexerError( const char* msg );
- void yyunput( int c, char* buf_ptr );
- int yyinput();
- void yy_load_buffer_state();
- void yy_init_buffer( struct yy_buffer_state* b, std::istream* s );
- void yy_flush_buffer( struct yy_buffer_state* b );
- int yy_start_stack_ptr;
- int yy_start_stack_depth;
- int* yy_start_stack;
- void yy_push_state( int new_state );
- void yy_pop_state();
- int yy_top_state();
- yy_state_type yy_get_previous_state();
- yy_state_type yy_try_NUL_trans( yy_state_type current_state );
- int yy_get_next_buffer();
- std::istream* yyin; // input source for default LexerInput
- std::ostream* yyout; // output sink for default LexerOutput
- struct yy_buffer_state* yy_current_buffer;
- // yy_hold_char holds the character lost when yytext is formed.
- char yy_hold_char;
- // Number of characters read into yy_ch_buf.
- int yy_n_chars;
- // Points to current character in buffer.
- char* yy_c_buf_p;
- int yy_init; // whether we need to initialize
- int yy_start; // start state number
- // Flag which is used to allow yywrap()'s to do buffer switches
- // instead of setting up a fresh yyin. A bit of a hack ...
- int yy_did_buffer_switch_on_eof;
- // The following are not always needed, but may be depending
- // on use of certain flex features (like REJECT or yymore()).
- yy_state_type yy_last_accepting_state;
- char* yy_last_accepting_cpos;
- yy_state_type* yy_state_buf;
- yy_state_type* yy_state_ptr;
- char* yy_full_match;
- int* yy_full_state;
- int yy_full_lp;
- int yy_lp;
- int yy_looking_for_trail_begin;
- int yy_more_flag;
- int yy_more_len;
- int yy_more_offset;
- int yy_prev_more_offset;
- };
- #undef NEED_REDEF_FLEX
- #endif
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