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Java > Open Source Codes > edu > rice > cs > drjava > model > definitions > indent > QuestionHasCharPrecedingOpenBrace


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33
34 package edu.rice.cs.drjava.model.definitions.indent;
35
36 import edu.rice.cs.drjava.model.AbstractDJDocument;
37 import edu.rice.cs.drjava.model.definitions.reducedmodel.*;
38 import javax.swing.text.BadLocationException JavaDoc;
39
40
41 /**
42  * Determines whether or not the last '{' was immediately preceded
43  * by _prefix So when _prefix='=', effectivily, we are looking for "={"
44  * This questions corresponds to rule 22 in our decision tree.
45  * @version $Id: QuestionHasCharPrecedingOpenBrace.java 3901 2006-06-30 05:28:11Z rcartwright $
46  */
47 public class QuestionHasCharPrecedingOpenBrace extends IndentRuleQuestion {
48   private char[] _prefix;
49
50   /**
51    * @param yesRule The decision subtree for the case that this rule applies
52    * in the current context.
53    * @param noRule The decision subtree for the case that this rule does not
54    * apply in the current context.
55    */
56   public QuestionHasCharPrecedingOpenBrace(char[] prefix, IndentRule yesRule, IndentRule noRule) {
57     super(yesRule, noRule);
58     _prefix = prefix;
59   }
60   
61   /** @param doc The AbstractDJDocument containing the current line.
62    * @return true iff the last block/expression-list opened before the start of the current line begins with '{'.
63    */
64   boolean applyRule(AbstractDJDocument doc, int reason) {
65     // PRE: We are inside a {.
66
67     int origin = doc.getCurrentLocation();
68     int lineStart = doc.getLineStartPos(origin);
69     
70     // Get brace for start of line
71 doc.move(lineStart - origin);
72     IndentInfo info = doc.getIndentInformation();
73     doc.move(origin - lineStart);
74     
75     if ((!info.braceType.equals(IndentInfo.openSquiggly)) ||
76         (info.distToBrace < 0)) {
77       // Precondition not met: we should have a brace
78 return false;
79     }
80     int bracePos = lineStart - info.distToBrace;
81     
82     // Get position of previous non-WS char (not in comments)
83 int prevNonWS = -1;
84     try {
85       prevNonWS = doc.findPrevNonWSCharPos(bracePos);
86       char c = doc.getText(prevNonWS,1).charAt(0);
87       for (char pchar: _prefix) if (c == pchar) return true;
88     }
89     catch (BadLocationException JavaDoc e) {
90     }
91     return false;
92   }
93 }
94
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