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1 | /******************************************************************************* |
2 | * Copyright (c) 2000, 2009 IBM Corporation and others. | |
3 | * All rights reserved. This program and the accompanying materials | |
4 | * are made available under the terms of the Eclipse Public License v1.0 | |
5 | * which accompanies this distribution, and is available at | |
6 | * http://www.eclipse.org/legal/epl-v10.html | |
7 | * | |
8 | * Contributors: | |
9 | * IBM Corporation - initial API and implementation | |
10 | *******************************************************************************/ | |
11 | package org.eclipse.jdt.internal.corext.dom.fragments; | |
12 | ||
13 | import org.eclipse.core.runtime.Assert; | |
14 | ||
15 | import org.eclipse.jdt.core.IBuffer; | |
16 | import org.eclipse.jdt.core.ISourceRange; | |
17 | import org.eclipse.jdt.core.ToolFactory; | |
18 | import org.eclipse.jdt.core.compiler.IScanner; | |
19 | import org.eclipse.jdt.core.compiler.ITerminalSymbols; | |
20 | import org.eclipse.jdt.core.compiler.InvalidInputException; | |
21 | import org.eclipse.jdt.core.dom.ASTNode; | |
22 | ||
23 | import org.eclipse.jdt.internal.corext.SourceRangeFactory; | |
24 | ||
25 | ||
26 | /** | |
27 | * This class houses a collection of static methods which do not refer to, | |
28 | * or otherwise depend on, other classes in this package. Each | |
29 | * package-visible method is called by more than one other class in this | |
30 | * package. Since they do not depend on other classes in this package, | |
31 | * they could be moved to some less specialized package. | |
32 | */ | |
33 | class Util { | |
34 | static boolean rangeIncludesNonWhitespaceOutsideRange(ISourceRange selection, ISourceRange nodes, IBuffer buffer) { | |
35 | if (!covers(selection, nodes)) | |
36 | return false; | |
37 | ||
38 | //TODO: skip leading comments. Consider that leading line comment must be followed by newline! | |
39 | if(!isJustWhitespace(selection.getOffset(), nodes.getOffset(), buffer)) | |
40 | return true; | |
41 | if(!isJustWhitespaceOrComment(nodes.getOffset() + nodes.getLength(), selection.getOffset() + selection.getLength(), buffer)) | |
42 | return true; | |
43 | return false; | |
44 | } | |
45 | private static boolean isJustWhitespace(int start, int end, IBuffer buffer) { | |
46 | if (start == end) | |
47 | return true; | |
48 | Assert.isTrue(start <= end); | |
49 | return 0 == buffer.getText(start, end - start).trim().length(); | |
50 | } | |
51 | private static boolean isJustWhitespaceOrComment(int start, int end, IBuffer buffer) { | |
52 | if (start == end) | |
53 | return true; | |
54 | Assert.isTrue(start <= end); | |
55 | String trimmedText= buffer.getText(start, end - start).trim(); | |
56 | if (0 == trimmedText.length()) { | |
57 | return true; | |
58 | } else { | |
59 | IScanner scanner= ToolFactory.createScanner(false, false, false, null); | |
60 | scanner.setSource(trimmedText.toCharArray()); | |
61 | try { | |
62 | return scanner.getNextToken() == ITerminalSymbols.TokenNameEOF; | |
63 | } catch (InvalidInputException e) { | |
64 | return false; | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
69 | public static int getEndExclusive(ISourceRange sourceRange) { | |
70 | return sourceRange.getOffset() + sourceRange.getLength(); | |
71 | } | |
72 | ||
73 | public static int getEndInclusive(ISourceRange sourceRange) { | |
74 | return getEndExclusive(sourceRange) - 1; | |
75 | } | |
76 | ||
77 | public static boolean covers(ISourceRange sourceRange, ASTNode astNode) { | |
78 | return covers(sourceRange, SourceRangeFactory.create(astNode)); | |
79 | } | |
80 | ||
81 | public static boolean covers(ISourceRange thisRange, ISourceRange otherRange) { | |
82 | return thisRange.getOffset() <= otherRange.getOffset() | |
83 | && getEndInclusive(thisRange) >= getEndInclusive(otherRange); | |
84 | } | |
85 | ||
86 | } |