diff options
Diffstat (limited to 'usr.bin/lex/FlexLexer.h')
| -rw-r--r-- | usr.bin/lex/FlexLexer.h | 96 |
1 files changed, 53 insertions, 43 deletions
diff --git a/usr.bin/lex/FlexLexer.h b/usr.bin/lex/FlexLexer.h index feb40b6..6c9a950 100644 --- a/usr.bin/lex/FlexLexer.h +++ b/usr.bin/lex/FlexLexer.h @@ -1,6 +1,7 @@ -// $Header: FlexLexer.h,v 1.2 94/01/04 14:57:26 vern Exp $ +// $Header: /home/daffy/u0/vern/flex/RCS/FlexLexer.h,v 1.19 96/05/25 20:43:02 vern Exp $ -// FlexLexer.h -- define classes for lexical analyzers generated by flex +// FlexLexer.h -- define interfaces for lexical analyzer classes generated +// by flex // Copyright (c) 1993 The Regents of the University of California. // All rights reserved. @@ -22,19 +23,26 @@ // WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. -#ifndef __FLEX_LEXER_H -#define __FLEX_LEXER_H - - -// This file defines two classes. The first, FlexLexer, is an abstract -// class which specifies the external interface provided to flex C++ -// lexer objects. The second, yyFlexLexer, fills out most of the meat -// of the lexer class; its internals may vary from lexer to lexer -// depending on things like whether REJECT is used. +// 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. +// 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.h> extern "C++" { @@ -58,46 +66,46 @@ public: virtual int yylex() = 0; + // Call yylex with new input/output sources. + int yylex( istream* new_in, 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( istream* new_in = 0, + 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 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( istream* arg_yyin = 0, ostream* arg_yyout = 0 ) - { - yyin = arg_yyin; - yyout = arg_yyout; - yy_c_buf_p = 0; - yy_init = 1; - yy_start = 0; - - yy_did_buffer_switch_on_eof = 0; - - yy_looking_for_trail_begin = 0; - yy_more_flag = 0; - yy_more_len = 0; - - yy_start_stack_ptr = yy_start_stack_depth = 0; - yy_start_stack = 0; - - yy_current_buffer = 0; + yyFlexLexer( istream* arg_yyin = 0, ostream* arg_yyout = 0 ); -#ifdef YY_USES_REJECT - yy_state_buf = new yy_state_type[YY_BUF_SIZE + 2]; -#else - yy_state_buf = 0; -#endif - } - - virtual ~yyFlexLexer() - { - delete yy_state_buf; - } + virtual ~yyFlexLexer(); void yy_switch_to_buffer( struct yy_buffer_state* new_buffer ); struct yy_buffer_state* yy_create_buffer( istream* s, int size ); @@ -105,6 +113,7 @@ public: void yyrestart( istream* s ); virtual int yylex(); + virtual void switch_streams( istream* new_in, ostream* new_out ); protected: virtual int LexerInput( char* buf, int max_size ); @@ -116,6 +125,7 @@ protected: void yy_load_buffer_state(); void yy_init_buffer( struct yy_buffer_state* b, istream* s ); + void yy_flush_buffer( struct yy_buffer_state* b ); int yy_start_stack_ptr; int yy_start_stack_depth; @@ -168,8 +178,8 @@ protected: int yy_more_flag; int yy_more_len; + int yy_more_offset; + int yy_prev_more_offset; }; -} - #endif |
