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03: * Copyright (c) 2001-2007, JavaPLT group at Rice University (javaplt@rice.edu)
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15: * derived from this software without specific prior written permission.
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36:
37: package edu.rice.cs.drjava.model.definitions.indent;
38:
39: import edu.rice.cs.drjava.model.AbstractDJDocument;
40: import edu.rice.cs.drjava.model.definitions.reducedmodel.*;
41: import javax.swing.text.BadLocationException;
42:
43: /**
44: * Determines whether or not the last '{' was immediately preceded
45: * by _prefix So when _prefix='=', effectivily, we are looking for "={"
46: * This questions corresponds to rule 22 in our decision tree.
47: * @version $Id: QuestionHasCharPrecedingOpenBrace.java 4255 2007-08-28 19:17:37Z mgricken $
48: */
49: public class QuestionHasCharPrecedingOpenBrace extends
50: IndentRuleQuestion {
51: private char[] _prefix;
52:
53: /**
54: * @param yesRule The decision subtree for the case that this rule applies
55: * in the current context.
56: * @param noRule The decision subtree for the case that this rule does not
57: * apply in the current context.
58: */
59: public QuestionHasCharPrecedingOpenBrace(char[] prefix,
60: IndentRule yesRule, IndentRule noRule) {
61: super (yesRule, noRule);
62: _prefix = prefix;
63: }
64:
65: /** @param doc The AbstractDJDocument containing the current line.
66: * @return true iff the last block/expression-list opened before the start of the current line begins with '{'.
67: */
68: boolean applyRule(AbstractDJDocument doc,
69: Indenter.IndentReason reason) {
70: // PRE: We are inside a {.
71:
72: int origin = doc.getCurrentLocation();
73: int lineStart = doc.getLineStartPos(origin);
74:
75: // Get brace for start of line
76: doc.move(lineStart - origin);
77: IndentInfo info = doc.getIndentInformation();
78: doc.move(origin - lineStart);
79:
80: if ((!info.braceType.equals(IndentInfo.openSquiggly))
81: || (info.distToBrace < 0)) {
82: // Precondition not met: we should have a brace
83: return false;
84: }
85: int bracePos = lineStart - info.distToBrace;
86:
87: // Get position of previous non-WS char (not in comments)
88: int prevNonWS = -1;
89: try {
90: prevNonWS = doc.findPrevNonWSCharPos(bracePos);
91: char c = doc.getText(prevNonWS, 1).charAt(0);
92: for (char pchar : _prefix)
93: if (c == pchar)
94: return true;
95: } catch (BadLocationException e) {
96: }
97: return false;
98: }
99: }
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