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1 /*******************************************************************************
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2 * Copyright (c) 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.jface.text.RewriteSessionEditProcessor;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.text.edits.CopyTargetEdit;
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18 import dwtx.text.edits.DeleteEdit;
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19 import dwtx.text.edits.InsertEdit;
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20 import dwtx.text.edits.MalformedTreeException;
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21 import dwtx.text.edits.MoveTargetEdit;
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22 import dwtx.text.edits.ReplaceEdit;
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23 import dwtx.text.edits.TextEdit;
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24 import dwtx.text.edits.TextEditProcessor;
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25 import dwtx.text.edits.TextEditVisitor;
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26 import dwtx.text.edits.UndoEdit;
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27
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28 /**
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29 * A text edit processor that brackets the application of edits into a document rewrite session.
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30 *
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31 * @since 3.3
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32 */
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33 public final class RewriteSessionEditProcessor : TextEditProcessor {
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34 /** The threshold for <em>large</em> text edits. */
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35 private static final int THRESHOLD= 1000;
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36
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37 /**
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38 * Text edit visitor that estimates the compound size of an edit tree in characters.
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39 */
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40 private static final class SizeVisitor : TextEditVisitor {
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41 int fSize= 0;
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42
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43 public bool visit(CopyTargetEdit edit) {
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44 fSize += edit.getLength();
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45 return super.visit(edit);
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46 }
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47
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48 public bool visit(DeleteEdit edit) {
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49 fSize += edit.getLength();
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50 return super.visit(edit);
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51 }
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52
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53 public bool visit(InsertEdit edit) {
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54 fSize += edit.getText().length();
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55 return super.visit(edit);
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56 }
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57
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58 public bool visit(MoveTargetEdit edit) {
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59 fSize += edit.getLength();
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60 return super.visit(edit);
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61 }
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62
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63 public bool visit(ReplaceEdit edit) {
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64 fSize += Math.max(edit.getLength(), edit.getText().length());
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65 return super.visit(edit);
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66 }
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67 }
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68
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69 /**
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70 * Constructs a new edit processor for the given document.
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71 *
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72 * @param document the document to manipulate
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73 * @param root the root of the text edit tree describing the modifications. By passing a text
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74 * edit a a text edit processor the ownership of the edit is transfered to the text edit
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75 * processors. Clients must not modify the edit (e.g adding new children) any longer.
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76 * @param style {@link TextEdit#NONE}, {@link TextEdit#CREATE_UNDO} or
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77 * {@link TextEdit#UPDATE_REGIONS})
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78 */
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79 public RewriteSessionEditProcessor(IDocument document, TextEdit root, int style) {
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80 super(document, root, style);
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81 }
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82
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83 /*
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84 * @see dwtx.text.edits.TextEditProcessor#performEdits()
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85 */
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86 public UndoEdit performEdits() throws MalformedTreeException, BadLocationException {
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87 IDocument document= getDocument();
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88 if (!(document instanceof IDocumentExtension4))
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89 return super.performEdits();
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90
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91 IDocumentExtension4 extension= (IDocumentExtension4) document;
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92 bool isLargeEdit= isLargeEdit(getRoot());
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93 DocumentRewriteSessionType type= isLargeEdit ? DocumentRewriteSessionType.UNRESTRICTED : DocumentRewriteSessionType.UNRESTRICTED_SMALL;
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94
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95 DocumentRewriteSession session= extension.startRewriteSession(type);
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96 try {
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97 return super.performEdits();
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98 } finally {
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99 extension.stopRewriteSession(session);
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100 }
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101 }
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102
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103 /**
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104 * Returns <code>true</code> if the passed edit is considered <em>large</em>,
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105 * <code>false</code> otherwise.
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106 *
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107 * @param edit the edit to check
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108 * @return <code>true</code> if <code>edit</code> is considered <em>large</em>,
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109 * <code>false</code> otherwise
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110 * @since 3.3
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111 */
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112 public static bool isLargeEdit(TextEdit edit) {
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113 SizeVisitor sizeVisitor= new SizeVisitor();
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114 edit.accept(sizeVisitor);
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115 return sizeVisitor.fSize > THRESHOLD;
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116 }
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117
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118 }
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