View Javadoc

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  }