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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
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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21: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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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: import edu.rice.cs.drjava.model.AbstractDJDocument;
42:
43: /** Question rule in the indentation decision tree. Determines if the current line starts a new "phrase" within a
44: * parenthesized expression. Specifically, this rule determines if the previous line ends in a comma, semicolon,
45: * open paren, or open bracket. Note that whitespace, blank lines, and comments are disregarded.
46: *
47: * @version $Id: QuestionNewParenPhrase.java 4255 2007-08-28 19:17:37Z mgricken $
48: */
49: public class QuestionNewParenPhrase extends IndentRuleQuestion {
50:
51: /**
52: * Constructs a new rule to determine if the current line starts
53: * new paren phrase.
54: * @param yesRule Rule to use if this rule holds
55: * @param noRule Rule to use if this rule does not hold
56: */
57: public QuestionNewParenPhrase(IndentRule yesRule, IndentRule noRule) {
58: super (yesRule, noRule);
59: }
60:
61: /**
62: * Determines if the previous line ends in a comma, semicolon,
63: * open paren, open bracket, operator, or comparator.
64: * @param doc AbstractDJDocument containing the line to be indented.
65: * @return true if this node's rule holds.
66: */
67: boolean applyRule(AbstractDJDocument doc,
68: Indenter.IndentReason reason) {
69:
70: try {
71: // Find start of line
72: int here = doc.getCurrentLocation();
73: int startLine = doc.getLineStartPos(here);
74:
75: if (startLine > AbstractDJDocument.DOCSTART) {
76: // Find previous delimiter (looking in paren phrases)
77: char[] delims = { ';', ',', '(', '[', '&', '|', '+',
78: '-', '*', '/', '%', '=', '<', '>', '}' };
79: int prevDelim = doc.findPrevDelimiter(startLine,
80: delims, false);
81: if (prevDelim == AbstractDJDocument.ERROR_INDEX) {
82: return false;
83: }
84:
85: // Make sure the delim is the previous non-WS char
86: int nextNonWS = doc.getFirstNonWSCharPos(prevDelim + 1);
87: if (nextNonWS == AbstractDJDocument.ERROR_INDEX) {
88: nextNonWS = startLine;
89: }
90: return (nextNonWS >= startLine);
91: }
92: } catch (BadLocationException e) {
93: // Shouldn't happen
94: throw new UnexpectedException(e);
95: }
96: // On first line
97: return false;
98: }
99: }
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