1 /**
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that the following conditions are
4 * met :
5 *
6 * . Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 *
9 * . Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * . The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 package cpptools.preprocessor;
30
31 import java.util.Stack;
32 import cppast.ParserTokenManager;
33 import cppast.Token;
34
35 /**
36 * Manages macro pre-processing.
37 *
38 * @author Mathieu Champlon
39 */
40 public final class Macro extends AbstractTokenFilter
41 {
42 private final TokenProvider provider;
43
44 /**
45 * Create a macro.
46 *
47 * @param provider the token provider to retrieve subsequent tokens
48 * @param buffer the token stack where to output filtered tokens
49 * @param name the define symbol
50 * @param value the define value
51 */
52 public Macro( final TokenProvider provider, final Stack<Token> buffer, final String name, final String value )
53 {
54 super( buffer, name, value );
55 if( provider == null )
56 throw new IllegalArgumentException( "parameter 'provider' is null" );
57 this.provider = provider;
58 }
59
60 /**
61 * {@inheritDoc}
62 */
63 public boolean process( final Token token )
64 {
65 if( matches( token.image ) )
66 {
67 final Token next = provider.next();
68 if( next.kind == ParserTokenManager.LPARENTHESIS )
69 replace( token );
70 else
71 undo( token, next );
72 return true;
73 }
74 return false;
75 }
76
77 private void replace( final Token token )
78 {
79 erase();
80 insert( token );
81 }
82
83 private void erase()
84 {
85 Token token = null;
86 int level = 1;
87 do
88 {
89 token = provider.next();
90 if( token.kind == ParserTokenManager.LPARENTHESIS )
91 ++level;
92 if( token.kind == ParserTokenManager.RPARENTHESIS )
93 --level;
94 }
95 while( level != 0 || token.kind != ParserTokenManager.RPARENTHESIS );
96 }
97 }