153 lines
4.4 KiB
C++
153 lines
4.4 KiB
C++
// $Header: /cvsroot/src/usr.bin/lex/Attic/FlexLexer.h,v 1.1 1993/12/02 19:17:24 jtc Exp $
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// FlexLexer.h -- define classes for lexical analyzers generated by flex
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// Copyright (c) 1993 The Regents of the University of California.
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// All rights reserved.
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//
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// This code is derived from software contributed to Berkeley by
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// Kent Williams and Tom Epperly.
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//
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// Redistribution and use in source and binary forms are permitted provided
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// that: (1) source distributions retain this entire copyright notice and
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// comment, and (2) distributions including binaries display the following
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// acknowledgement: ``This product includes software developed by the
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// University of California, Berkeley and its contributors'' in the
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// documentation or other materials provided with the distribution and in
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// all advertising materials mentioning features or use of this software.
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// Neither the name of the University nor the names of its contributors may
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// be used to endorse or promote products derived from this software without
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// specific prior written permission.
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// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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#ifndef __FLEX_LEXER_H
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#define __FLEX_LEXER_H
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// This file defines two classes. The first, FlexLexer, is an abstract
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// class which specifies the external interface provided to flex C++
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// lexer objects. The second, yyFlexLexer, fills out most of the meat
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// of the lexer class; its internals may vary from lexer to lexer
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// depending on things like whether REJECT is used.
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//
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// If you want to create multiple lexer classes, you use the -P flag
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// to rename each yyFlexLexer to some other xxFlexLexer.
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class FlexLexer {
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public:
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virtual ~FlexLexer() { }
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const char* YYText() { return yytext; }
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int YYLeng() { return yyleng; }
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virtual void yy_switch_to_buffer( YY_BUFFER_STATE new_buffer ) = 0;
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virtual YY_BUFFER_STATE yy_create_buffer( istream* s, int size ) = 0;
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virtual void yy_delete_buffer( YY_BUFFER_STATE b ) = 0;
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virtual void yyrestart( istream* s ) = 0;
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virtual int yylex() = 0;
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protected:
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char* yytext;
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int yyleng;
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};
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class yyFlexLexer : public FlexLexer {
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public:
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// arg_yyin and arg_yyout default to the cin and cout, but we
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// only make that assignment when initializing in yylex().
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yyFlexLexer( istream* arg_yyin = 0, ostream* arg_yyout = 0 )
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{
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yyin = arg_yyin;
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yyout = arg_yyout;
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yy_c_buf_p = 0;
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yy_init = 1;
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yy_start = 0;
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yy_did_buffer_switch_on_eof = 0;
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yy_looking_for_trail_begin = 0;
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yy_more_flag = 0;
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yy_more_len = 0;
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yy_current_buffer = 0;
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#ifdef YY_USES_REJECT
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yy_state_buf = new yy_state_type[YY_BUF_SIZE + 2];
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#else
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yy_state_buf = 0;
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#endif
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}
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virtual ~yyFlexLexer()
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{
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delete yy_state_buf;
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}
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void yy_switch_to_buffer( YY_BUFFER_STATE new_buffer );
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YY_BUFFER_STATE yy_create_buffer( istream* s, int size );
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void yy_delete_buffer( YY_BUFFER_STATE b );
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void yyrestart( istream* s );
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virtual int yylex();
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protected:
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virtual int LexerInput( char* buf, int max_size );
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virtual void LexerOutput( const char* buf, int size );
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void yyunput( int c, char* buf_ptr );
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int yyinput();
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void yy_load_buffer_state();
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void yy_init_buffer( YY_BUFFER_STATE b, istream* s );
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yy_state_type yy_get_previous_state();
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yy_state_type yy_try_NUL_trans( yy_state_type current_state );
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int yy_get_next_buffer();
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istream* yyin; // input source for default LexerInput
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ostream* yyout; // output sink for default LexerOutput
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YY_BUFFER_STATE yy_current_buffer;
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// yy_hold_char holds the character lost when yytext is formed.
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char yy_hold_char;
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// Number of characters read into yy_ch_buf.
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int yy_n_chars;
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// Points to current character in buffer.
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char* yy_c_buf_p;
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int yy_init; // whether we need to initialize
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int yy_start; // start state number
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// Flag which is used to allow yywrap()'s to do buffer switches
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// instead of setting up a fresh yyin. A bit of a hack ...
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int yy_did_buffer_switch_on_eof;
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// The following are not always needed, but may be depending
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// on use of certain flex features (like REJECT or yymore()).
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yy_state_type yy_last_accepting_state;
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char* yy_last_accepting_cpos;
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yy_state_type* yy_state_buf;
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yy_state_type* yy_state_ptr;
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char* yy_full_match;
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int* yy_full_state;
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int yy_full_lp;
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int yy_lp;
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int yy_looking_for_trail_begin;
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int yy_more_flag;
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int yy_more_len;
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};
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#endif
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