01: /*BEGIN_COPYRIGHT_BLOCK
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
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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 4255 2007-08-28 19:17:37Z mgricken $
46: * Asks whether the current line is empty (contains only whitespace), or indentation was
47: * spawned by pressing enter.
48: *
49: * TODO: eliminate duplicated code with QuestionCurrentLineEmpty
50: */
51: class QuestionCurrLineEmptyOrEnterPress extends IndentRuleQuestion {
52:
53: QuestionCurrLineEmptyOrEnterPress(IndentRule yesRule,
54: IndentRule noRule) {
55: super (yesRule, noRule);
56: }
57:
58: /** Determines if the current line in the document is empty.
59: * @param doc AbstractDJDocument containing the line to be indented.
60: * @param reason The reason that the indentation is being done
61: * @return true if this node's rule holds.
62: */
63: boolean applyRule(AbstractDJDocument doc,
64: Indenter.IndentReason reason) {
65: if (reason == Indenter.IndentReason.ENTER_KEY_PRESS)
66: return true;
67: try {
68: // Determine if there are only whitespace chars by seeing if the first non-WS char is the endOfLine
69: int here = doc.getCurrentLocation();
70: int endOfLine = doc.getLineEndPos(here);
71: int firstNonWS = doc.getLineFirstCharPos(here);
72: return (endOfLine == firstNonWS);
73: } catch (BadLocationException e) {
74: // Shouldn't happen
75: throw new UnexpectedException(e);
76: }
77: }
78: }
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