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annotate org.eclipse.jface.text/src/org/eclipse/jface/internal/text/link/contentassist/LineBreakingReader.d @ 16:dbfb303e8fb0

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first complete successful compile (win-only)
author Frank Benoit <benoit@tionex.de>
date Wed, 18 Mar 2009 08:56:47 +0100
parents bc29606a740c
children ebefa5c2eab4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 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 org.eclipse.jface.internal.text.link.contentassist.LineBreakingReader;
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14
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15 import org.eclipse.jface.internal.text.link.contentassist.IProposalListener; // packageimport
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16 import org.eclipse.jface.internal.text.link.contentassist.CompletionProposalPopup2; // packageimport
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17 import org.eclipse.jface.internal.text.link.contentassist.ContextInformationPopup2; // packageimport
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18 import org.eclipse.jface.internal.text.link.contentassist.ContentAssistMessages; // packageimport
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19 import org.eclipse.jface.internal.text.link.contentassist.Helper2; // packageimport
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20 import org.eclipse.jface.internal.text.link.contentassist.PopupCloser2; // packageimport
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21 import org.eclipse.jface.internal.text.link.contentassist.IContentAssistListener2; // packageimport
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22 import org.eclipse.jface.internal.text.link.contentassist.ContentAssistant2; // packageimport
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23 import org.eclipse.jface.internal.text.link.contentassist.AdditionalInfoController2; // packageimport
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24
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25
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26 import java.lang.all;
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27 import java.io.Reader;
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28 import java.util.Set;
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29 import java.io.BufferedReader;
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30 import java.mangoicu.UBreakIterator;
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32 import org.eclipse.swt.graphics.GC;
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33
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34 /*
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35 * Not a real reader. Could change if requested
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36 */
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37 public class LineBreakingReader {
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38
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39 private BufferedReader fReader;
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40 private GC fGC;
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41 private int fMaxWidth;
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42
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43 private String fLine;
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44 private int fOffset;
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45
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46 private UBreakIterator fLineBreakIterator;
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47 private bool fBreakWords;
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48
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49 /**
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50 * Creates a reader that breaks an input text to fit in a given width.
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51 *
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52 * @param reader Reader of the input text
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53 * @param gc The graphic context that defines the currently used font sizes
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54 * @param maxLineWidth The max width (pixels) where the text has to fit in
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55 */
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56 public this(Reader reader, GC gc, int maxLineWidth) {
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57 fReader= new BufferedReader(reader);
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58 fGC= gc;
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59 fMaxWidth= maxLineWidth;
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60 fOffset= 0;
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61 fLine= null;
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62 fLineBreakIterator= UBreakIterator.openLineIterator( ULocale.Default);
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63 fBreakWords= true;
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64 }
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65
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66 public bool isFormattedLine() {
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67 return fLine !is null;
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68 }
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69
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70 /**
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71 * Reads the next line. The lengths of the line will not exceed the given maximum
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72 * width.
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73 *
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74 * @return the next line
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75 * @throws IOException
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76 */
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77 public String readLine() {
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78 if (fLine is null) {
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79 String line= fReader.readLine();
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80 if (line is null)
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81 return null;
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82
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83 int lineLen= fGC.textExtent(line).x;
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84 if (lineLen < fMaxWidth) {
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85 return line;
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86 }
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87 fLine= line;
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88 fLineBreakIterator.setText(line);
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89 fOffset= 0;
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90 }
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91 int breakOffset= findNextBreakOffset(fOffset);
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92 String res;
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93 if (breakOffset !is UBreakIterator.DONE) {
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94 res= fLine.substring(fOffset, breakOffset);
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95 fOffset= findWordBegin(breakOffset);
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96 if (fOffset is fLine.length()) {
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97 fLine= null;
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98 }
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99 } else {
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100 res= fLine.substring(fOffset);
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101 fLine= null;
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102 }
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103 return res;
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104 }
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105
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106 private int findNextBreakOffset(int currOffset) {
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107 int currWidth= 0;
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108 int nextOffset= fLineBreakIterator.following(currOffset);
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109 while (nextOffset !is UBreakIterator.DONE) {
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110 String word= fLine.substring(currOffset, nextOffset);
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111 int wordWidth= fGC.textExtent(word).x;
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112 int nextWidth= wordWidth + currWidth;
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113 if (nextWidth > fMaxWidth) {
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114 if (currWidth > 0)
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115 return currOffset;
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116
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117 if (!fBreakWords)
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118 return nextOffset;
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119
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120 // need to fit into fMaxWidth
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121 int length= word.length();
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122 while (length >= 0) {
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123 length--;
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124 word= word.substring(0, length);
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125 wordWidth= fGC.textExtent(word).x;
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126 if (wordWidth + currWidth < fMaxWidth)
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127 return currOffset + length;
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128 }
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129 return nextOffset;
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130 }
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131 currWidth= nextWidth;
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132 currOffset= nextOffset;
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133 nextOffset= fLineBreakIterator.next();
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134 }
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135 return nextOffset;
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136 }
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137
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138 private int findWordBegin(int idx) {
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139 while (idx < fLine.length() && Character.isWhitespace(fLine.charAt(idx))) {
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140 idx++;
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141 }
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142 return idx;
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143 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
144 }