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// -*-C++-*- |
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// FlexLexer.h -- define interfaces for lexical analyzer classes generated |
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// by flex |
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|
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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, with or without |
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// modification, are permitted provided that the following conditions |
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// are met: |
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|
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// 1. Redistributions of source code must retain the above copyright |
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// notice, this list of conditions and the following disclaimer. |
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// 2. Redistributions in binary form must reproduce the above copyright |
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// notice, this list of conditions and the following disclaimer in the |
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// documentation and/or other materials provided with the distribution. |
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|
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// Neither the name of the University nor the names of its contributors |
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// may be used to endorse or promote products derived from this software |
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// without specific prior written permission. |
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|
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// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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// IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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// PURPOSE. |
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|
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// This file defines FlexLexer, an abstract class which specifies the |
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// external interface provided to flex C++ lexer objects, and yyFlexLexer, |
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// which defines a particular lexer class. |
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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. You then |
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// include <FlexLexer.h> in your other sources once per lexer class: |
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// |
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// #undef yyFlexLexer |
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// #define yyFlexLexer xxFlexLexer |
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// #include <FlexLexer.h> |
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// |
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// #undef yyFlexLexer |
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// #define yyFlexLexer zzFlexLexer |
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// #include <FlexLexer.h> |
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// ... |
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|
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#ifndef __FLEX_LEXER_H |
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// Never included before - need to define base class. |
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#define __FLEX_LEXER_H |
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|
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#include <iostream> |
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# ifndef FLEX_STD |
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# define FLEX_STD std:: |
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# endif |
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|
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extern "C++" { |
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|
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struct yy_buffer_state; |
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typedef int yy_state_type; |
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|
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class FlexLexer { |
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public: |
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virtual ~FlexLexer() { } |
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|
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const char* YYText() const { return yytext; } |
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int YYLeng() const { return yyleng; } |
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|
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virtual void |
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yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0; |
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virtual struct yy_buffer_state* |
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yy_create_buffer( FLEX_STD istream* s, int size ) = 0; |
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virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0; |
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virtual void yyrestart( FLEX_STD istream* s ) = 0; |
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|
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virtual int yylex() = 0; |
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|
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// Call yylex with new input/output sources. |
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int yylex( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 ) |
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{ |
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switch_streams( new_in, new_out ); |
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return yylex(); |
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} |
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|
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// Switch to new input/output streams. A nil stream pointer |
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// indicates "keep the current one". |
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virtual void switch_streams( FLEX_STD istream* new_in = 0, |
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FLEX_STD ostream* new_out = 0 ) = 0; |
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|
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int lineno() const { return yylineno; } |
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|
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int debug() const { return yy_flex_debug; } |
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void set_debug( int flag ) { yy_flex_debug = flag; } |
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|
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protected: |
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char* yytext; |
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int yyleng; |
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int yylineno; // only maintained if you use %option yylineno |
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int yy_flex_debug; // only has effect with -d or "%option debug" |
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}; |
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|
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} |
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#endif // FLEXLEXER_H |
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|
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#if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce) |
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// Either this is the first time through (yyFlexLexerOnce not defined), |
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// or this is a repeated include to define a different flavor of |
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// yyFlexLexer, as discussed in the flex manual. |
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#define yyFlexLexerOnce |
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|
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extern "C++" { |
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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( FLEX_STD istream* arg_yyin = 0, FLEX_STD ostream* arg_yyout = 0 ); |
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virtual ~yyFlexLexer(); |
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void yy_switch_to_buffer( struct yy_buffer_state* new_buffer ); |
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struct yy_buffer_state* yy_create_buffer( FLEX_STD istream* s, int size ); |
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void yy_delete_buffer( struct yy_buffer_state* b ); |
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void yyrestart( FLEX_STD istream* s ); |
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|
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void yypush_buffer_state( struct yy_buffer_state* new_buffer ); |
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void yypop_buffer_state(); |
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virtual int yylex(); |
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virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 ); |
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virtual int yywrap(); |
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|
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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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virtual void LexerError( const char* msg ); |
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void yyunput( int c, char* buf_ptr ); |
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int yyinput(); |
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|
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void yy_load_buffer_state(); |
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void yy_init_buffer( struct yy_buffer_state* b, FLEX_STD istream* s ); |
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void yy_flush_buffer( struct yy_buffer_state* b ); |
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int yy_start_stack_ptr; |
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int yy_start_stack_depth; |
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int* yy_start_stack; |
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void yy_push_state( int new_state ); |
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void yy_pop_state(); |
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int yy_top_state(); |
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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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|
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FLEX_STD istream* yyin; // input source for default LexerInput |
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FLEX_STD ostream* yyout; // output sink for default LexerOutput |
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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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size_t yy_buffer_stack_top; /**< index of top of stack. */ |
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size_t yy_buffer_stack_max; /**< capacity of stack. */ |
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struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */ |
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void yyensure_buffer_stack(void); |
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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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int yy_more_offset; |
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int yy_prev_more_offset; |
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}; |
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|
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} |
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#endif // yyFlexLexer || ! yyFlexLexerOnce |
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