Mercurial > projects > dwt2
comparison org.eclipse.jface.text/src/org/eclipse/jface/internal/text/revisions/ChangeRegion.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
parents | |
children | 6f068362a363 |
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11:43904fec5dca | 12:bc29606a740c |
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1 /******************************************************************************* | |
2 * Copyright (c) 2000, 2006 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 * Port to the D programming language: | |
11 * Frank Benoit <benoit@tionex.de> | |
12 *******************************************************************************/ | |
13 module org.eclipse.jface.internal.text.revisions.ChangeRegion; | |
14 | |
15 import org.eclipse.jface.internal.text.revisions.HunkComputer; // packageimport | |
16 import org.eclipse.jface.internal.text.revisions.LineIndexOutOfBoundsException; // packageimport | |
17 import org.eclipse.jface.internal.text.revisions.Hunk; // packageimport | |
18 import org.eclipse.jface.internal.text.revisions.Colors; // packageimport | |
19 import org.eclipse.jface.internal.text.revisions.Range; // packageimport | |
20 import org.eclipse.jface.internal.text.revisions.RevisionPainter; // packageimport | |
21 import org.eclipse.jface.internal.text.revisions.RevisionSelectionProvider; // packageimport | |
22 | |
23 import java.lang.all; | |
24 import java.util.ListIterator; | |
25 import java.util.List; | |
26 import java.util.LinkedList; | |
27 import tango.text.convert.Format; | |
28 | |
29 import org.eclipse.core.runtime.Assert; | |
30 import org.eclipse.jface.text.revisions.Revision; | |
31 import org.eclipse.jface.text.source.ILineRange; | |
32 import org.eclipse.jface.text.source.LineRange; | |
33 | |
34 /** | |
35 * A change region describes a contiguous range of lines that was changed in the same revision of a | |
36 * document. Once it is adjusted to diff information, the originally contiguous range may be split | |
37 * into several ranges or even be empty. | |
38 * | |
39 * @since 3.2 | |
40 */ | |
41 public final class ChangeRegion { | |
42 private const Revision fRevision; | |
43 private const ILineRange fLines; | |
44 private const List fAdjusted; | |
45 | |
46 /** | |
47 * Creates a new change region for the given revision and line range. | |
48 * | |
49 * @param revision the revision of the new region | |
50 * @param lines the line range of the new region | |
51 * @throws IndexOutOfBoundsException if the line range is not well-formed | |
52 */ | |
53 public this(Revision revision, ILineRange lines) { | |
54 fAdjusted= new LinkedList(); | |
55 Assert.isLegal(revision !is null); | |
56 Assert.isLegal(lines !is null); | |
57 fLines= Range.copy(lines); | |
58 fRevision=revision; | |
59 clearDiff(); | |
60 } | |
61 | |
62 /** | |
63 * Returns the revision that this region belongs to. | |
64 * | |
65 * @return the revision that this region belongs to | |
66 */ | |
67 public Revision getRevision() { | |
68 return fRevision; | |
69 } | |
70 | |
71 /** | |
72 * Returns the original (before applying diff information) line range of this change region. | |
73 * | |
74 * @return the original (before applying diff information) line range of this change region | |
75 */ | |
76 public ILineRange getOriginalRange() { | |
77 return fLines; | |
78 } | |
79 | |
80 /** | |
81 * Returns the list of {@link ILineRange}s of this change region for which the revision | |
82 * information is still valid. | |
83 * | |
84 * @return the list of adjusted line ranges | |
85 */ | |
86 public List getAdjustedRanges() { | |
87 return fAdjusted; | |
88 } | |
89 | |
90 /** | |
91 * Returns the line coverage of the adjusted ranges, an empty range if the coverage is empty. | |
92 * | |
93 * @return the line coverage of the adjusted ranges | |
94 */ | |
95 public ILineRange getAdjustedCoverage() { | |
96 if (fAdjusted.isEmpty()) | |
97 return new LineRange(fLines.getStartLine(), 0); | |
98 | |
99 Range first= cast(Range) fAdjusted.get(0); | |
100 Range last= cast(Range) fAdjusted.get(fAdjusted.size() - 1); | |
101 | |
102 return Range.createAbsolute(first.start(), last.end()); | |
103 } | |
104 | |
105 /** | |
106 * Clears any adjusted ranges, restoring the original range. | |
107 */ | |
108 public void clearDiff() { | |
109 fAdjusted.clear(); | |
110 fAdjusted.add(Range.copy(fLines)); | |
111 } | |
112 | |
113 /** | |
114 * Adjusts this change region to a diff hunk. This will change the adjusted ranges. | |
115 * | |
116 * @param hunk the diff hunk to adjust to | |
117 */ | |
118 public void adjustTo(Hunk hunk) { | |
119 for (ListIterator it= fAdjusted.listIterator(); it.hasNext();) { | |
120 Range range= cast(Range) it.next(); | |
121 | |
122 // do we need a split? | |
123 int unchanged= getUnchanged(hunk, range.start()); | |
124 if (unchanged > 0) { | |
125 if (unchanged >= range.length()) | |
126 continue; | |
127 range= range.split(unchanged); | |
128 it.add(range); | |
129 it.previous(); it.next(); // needed so we can remove below | |
130 } | |
131 | |
132 int line= range.start(); | |
133 Assert.isTrue(hunk.line <= line); | |
134 | |
135 // by how much do we shrink? | |
136 int overlap= getOverlap(hunk, line); | |
137 if (overlap >= range.length()) { | |
138 it.remove(); | |
139 continue; | |
140 } | |
141 | |
142 // by how much do we move? | |
143 range.moveBy(hunk.delta + overlap); | |
144 range.resizeBy(-overlap); | |
145 } | |
146 | |
147 } | |
148 | |
149 private int getUnchanged(Hunk hunk, int line) { | |
150 return Math.max(0, hunk.line - line); | |
151 } | |
152 | |
153 /* | |
154 * Returns the number of lines after line that the hunk reports as changed. | |
155 */ | |
156 private int getOverlap(Hunk hunk, int line) { | |
157 | |
158 int deltaLine= hunk.line + hunk.changed; | |
159 if (hunk.delta >= 0) { | |
160 if (deltaLine <= line) | |
161 return 0; | |
162 return deltaLine - line; | |
163 } | |
164 | |
165 // hunk.delta < 0 | |
166 int hunkEnd= deltaLine - hunk.delta; | |
167 int cutCount= hunkEnd - line; | |
168 return Math.max(0, cutCount); | |
169 } | |
170 | |
171 /* | |
172 * @see java.lang.Object#toString() | |
173 */ | |
174 public override String toString() { | |
175 return Format("ChangeRegion [{},[{}+{})]", fRevision.toString(), fLines.getStartLine(), fLines.getNumberOfLines() ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ | |
176 } | |
177 } |