01: /*
02: ** Copyright (C) 1999, 2000, 2001 Lorenzo Bettini <bettini@gnu.org>
03: **  
04: ** This program is free software; you can redistribute it and/or modify
05: ** it under the terms of the GNU General Public License as published by
06: ** the Free Software Foundation; either version 2 of the License, or
07: ** (at your option) any later version.
08: **  
09: ** This program is distributed in the hope that it will be useful,
10: ** but WITHOUT ANY WARRANTY; without even the implied warranty of
11: ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12: ** GNU General Public License for more details.
13: **  
14: ** You should have received a copy of the GNU General Public License
15: ** along with this program; if not, write to the Free Software
16: ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17: **  
18: */
19: 
20: // textgen.h : Text Generator class &&
21: 
22: #ifndef _TEXTGEN_H
23: #define _TEXTGEN_H
24: 
25: #include <iostream.h>
26: 
27: #include "genfun.h"
28: 
29: class TextGenerator {
30:   public :
31:     virtual void generate( const char *s ) const { (*sout) << s ; }
32:     virtual void generate( const char *s, int start, int end ) const 
33:       {
34:         for ( int i = start ; i <= end ; ++i )
35:           (*sout) << s[i] ;
36:       }
37:     virtual void generateln( const char *s ) const
38:         { 
39:             generate( s ) ;
40:             (*sout) << endl ; 
41:         }
42:     virtual void generateEntire( const char *s ) const
43:         {
44:             startTextGeneration() ;
45:             generate(s) ;
46:             endTextGeneration() ;
47:         }
48:     virtual void startTextGeneration() const {}
49:     virtual void endTextGeneration() const {}
50:     virtual void beginText( const char *s ) const
51:         {
52:             startTextGeneration() ;
53:             if ( s )
54:                 generate( s ) ;
55:         }
56:     virtual void endText( const char *s ) const
57:         {
58:             if ( s )
59:                 generate( s ) ;
60:             endTextGeneration() ;
61:         }
62: } ;
63: 
64: // Decorator
65: class TextDecorator : public TextGenerator {
66:   protected :
67:     TextGenerator *decorated ;
68:   
69:   public :
70:     TextDecorator( TextGenerator *t ) : decorated( t ) {}
71: 
72:     virtual void startTextGeneration() const 
73:     { 
74:         startDecorate() ;
75:         if ( decorated )
76:             decorated->startTextGeneration() ;
77:     }
78:     virtual void endTextGeneration() const 
79:     { 
80:         if ( decorated )
81:             decorated->endTextGeneration() ;
82:         endDecorate() ;
83:     }
84: 
85:     // pure virtual functions
86:     virtual void startDecorate() const = 0 ;
87:     virtual void endDecorate() const = 0 ;
88: } ;
89: 
90: #endif