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02: *
03: * Copyright (c) 2001-2007, JavaPLT group at Rice University (javaplt@rice.edu)
04: * All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions are met:
08: * * Redistributions of source code must retain the above copyright
09: * notice, this list of conditions and the following disclaimer.
10: * * Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * * Neither the names of DrJava, the JavaPLT group, Rice University, nor the
14: * names of its contributors may be used to endorse or promote products
15: * derived from this software without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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36:
37: package edu.rice.cs.drjava.model.definitions.indent;
38:
39: import javax.swing.text.*;
40: import edu.rice.cs.util.UnexpectedException;
41:
42: import edu.rice.cs.drjava.model.AbstractDJDocument;
43:
44: /**
45: * Question rule in the indentation decision tree. Determines if the
46: * line previous to the current position starts with the specified character.
47: * @version $Id: QuestionPrevLineStartsWith.java 4255 2007-08-28 19:17:37Z mgricken $
48: */
49: public class QuestionPrevLineStartsWith extends IndentRuleQuestion {
50: private String _prefix;
51:
52: /**
53: * Constructs a new rule for the given prefix string.
54: * ALWAYS looks inside comments.
55: * @param prefix String to search for
56: * @param yesRule Rule to use if this rule holds
57: * @param noRule Rule to use if this rule does not hold
58: */
59: public QuestionPrevLineStartsWith(String prefix,
60: IndentRule yesRule, IndentRule noRule) {
61: super (yesRule, noRule);
62: _prefix = prefix;
63: }
64:
65: /** Determines if the previous line in the document starts with the specified characters, ignoring whitespace.
66: * @param doc AbstractDJDocument containing the line to be indented.
67: * @return true if this node's rule holds.
68: */
69: boolean applyRule(AbstractDJDocument doc,
70: Indenter.IndentReason reason) {
71:
72: try {
73: // Find start of line
74: int here = doc.getCurrentLocation();
75: int startLine = doc.getLineStartPos(here);
76:
77: if (startLine > AbstractDJDocument.DOCSTART) {
78: // Find start of previous line
79: int startPrevLine = doc.getLineStartPos(startLine - 1);
80: int firstChar = doc.getLineFirstCharPos(startPrevLine);
81:
82: // Compare prefix
83: String actualPrefix = doc.getText(firstChar, _prefix
84: .length());
85: return _prefix.equals(actualPrefix);
86: }
87: } catch (BadLocationException e) {
88: // Shouldn't happen
89: throw new UnexpectedException(e);
90: }
91: // On first line
92: return false;
93: }
94:
95: }
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