Pattern


1   // $Id: Pattern.java,v 1.2 2001/12/07 11:41:24 ramsdell Exp $
2   
3   // Pattern rules defined by a makefile.
4   
5   /*
6    * Copyright 1997 by John D. Ramsdell
7    *
8    * This program is free software; you can redistribute it and/or
9    * modify it under the terms of the GNU Lesser General Public License
10   * as published by the Free Software Foundation; either version 2
11   * of the License, or (at your option) any later version.
12   *
13   * This program is distributed in the hope that it will be useful,
14   * but WITHOUT ANY WARRANTY; without even the implied warranty of
15   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   * GNU Lesser General Public License for more details.
17   *
18   * You should have received a copy of the GNU Lesser General Public License
19   * along with this program; if not, write to the Free Software
20   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21   */
22  
23  package edu.neu.ccs.jmk;
24  
25  /**
26   * Pattern rules defined by a makefile.
27   * A pattern rule defines commands that can be used by a rule defined
28   * without commands as long as the rule's target matches the target
29   * of the pattern rule.
30   * @version November 1997
31   * @author John D. Ramsdell
32   */
33  final class Pattern
34  {
35    private Matcher matcher;
36    private String  [] prerequisites;
37    private Command[] commands;
38    private int lineNumber;
39  
40    /**
41     * Create a pattern rule.
42     */
43    Pattern(String   target, String  [] prerequisites,
44        Command[] commands, int lineNumber) {
45      matcher = new Matcher(target);
46      this.prerequisites = prerequisites;
47      this.commands = commands;
48      this.lineNumber = lineNumber;
49    }
50  
51    /**
52     * Merge a pattern into a rule.
53     * @return true if the targets match and the rule uses the pattern.
54     */
55    boolean merge(Rule rule) {
56      String   target = rule.getTarget();
57      String   match = matcher.match(target);
58      if (match == null)
59        return false;
60      String  [] dependencies = new String  [prerequisites.length];
61      for (int i = 0; i < prerequisites.length; i++)
62        dependencies[i] = Matcher.subst(match, prerequisites[i]);
63      return rule.tryPattern(match, dependencies, commands, lineNumber);
64    }
65  }
66
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