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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.
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17: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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36:
37: package edu.rice.cs.drjava.model.definitions.indent;
38:
39: import javax.swing.text.*;
40:
41: import edu.rice.cs.drjava.model.AbstractDJDocument;
42:
43: import edu.rice.cs.util.UnexpectedException;
44:
45: /** @version $Id: QuestionCurrLineEmptyOrEnterPress.java 3901 2006-06-30 05:28:11Z rcartwright $
46: * Asks whether the current line is empty (contains only whitespace), or indentation was
47: * spawned by pressing enter
48: */
49: class QuestionCurrLineEmpty extends IndentRuleQuestion {
50:
51: QuestionCurrLineEmpty(IndentRule yesRule, IndentRule noRule) {
52: super (yesRule, noRule);
53: }
54:
55: /** Determines if the current line in the document is empty.
56: * @param doc AbstractDJDocument containing the line to be indented.
57: * @param reason The reason that the the intentation is being done
58: * @return true if this node's rule holds.
59: */
60: boolean applyRule(AbstractDJDocument doc,
61: Indenter.IndentReason reason) {
62: try {
63: // Determine if there are only whitespace chars by seeing if the first non-WS char is the endOfLine
64: int here = doc.getCurrentLocation();
65: int endOfLine = doc.getLineEndPos(here);
66: int firstNonWS = doc.getLineFirstCharPos(here);
67: return (endOfLine == firstNonWS);
68: } catch (BadLocationException e) {
69: // Shouldn't happen
70: throw new UnexpectedException(e);
71: }
72: }
73: }
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