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FlexLexer.h
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// -*-C++-*- // 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 the following conditions // are met: // 1. Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // 2. Redistributions in binary form must reproduce the above copyright // notice, this list of conditions and the following disclaimer in the // documentation and/or other materials provided with the distribution. // 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> # ifndef FLEX_STD # define FLEX_STD std:: # endif extern "C++" { struct yy_buffer_state; typedef int yy_state_type; class FlexLexer { public: virtual ~FlexLexer() { } const char* YYText() const { return yytext; } int YYLeng() const { return yyleng; } virtual void yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0; virtual struct yy_buffer_state* yy_create_buffer( FLEX_STD istream* s, int size ) = 0; virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0; virtual void yyrestart( FLEX_STD istream* s ) = 0; virtual int yylex() = 0; // Call yylex with new input/output sources. int yylex( FLEX_STD istream* new_in, FLEX_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( FLEX_STD istream* new_in = 0, FLEX_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 // FLEXLEXER_H #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 manual. #define yyFlexLexerOnce extern "C++" { 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( FLEX_STD istream* arg_yyin = 0, FLEX_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( FLEX_STD istream* s, int size ); void yy_delete_buffer( struct yy_buffer_state* b ); void yyrestart( FLEX_STD istream* s ); void yypush_buffer_state( struct yy_buffer_state* new_buffer ); void yypop_buffer_state(); virtual int yylex(); virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 ); virtual int yywrap(); 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, FLEX_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(); FLEX_STD istream* yyin; // input source for default LexerInput FLEX_STD ostream* yyout; // output sink for default LexerOutput // 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; size_t yy_buffer_stack_top; /**< index of top of stack. */ size_t yy_buffer_stack_max; /**< capacity of stack. */ struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */ void yyensure_buffer_stack(void); // 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; }; } #endif // yyFlexLexer || ! yyFlexLexerOnce
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