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annotate org.eclipse.jface.text/src/org/eclipse/jface/internal/text/link/contentassist/LineBreakingReader.d @ 92:ebefa5c2eab4

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moving ICU bindings to com.ibm.icu
author Frank Benoit <benoit@tionex.de>
date Sun, 19 Apr 2009 13:49:38 +0200
parents dbfb303e8fb0
children
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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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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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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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31 import org.eclipse.swt.graphics.GC;
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33 import com.ibm.icu.text.BreakIterator;
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34
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35 /*
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36 * Not a real reader. Could change if requested
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37 */
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38 public class LineBreakingReader {
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40 private BufferedReader fReader;
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41 private GC fGC;
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42 private int fMaxWidth;
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43
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44 private String fLine;
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45 private int fOffset;
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46
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47 private BreakIterator fLineBreakIterator;
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48 private bool fBreakWords;
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49
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50 /**
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51 * Creates a reader that breaks an input text to fit in a given width.
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52 *
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53 * @param reader Reader of the input text
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54 * @param gc The graphic context that defines the currently used font sizes
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55 * @param maxLineWidth The max width (pixels) where the text has to fit in
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56 */
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57 public this(Reader reader, GC gc, int maxLineWidth) {
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58 fReader= new BufferedReader(reader);
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59 fGC= gc;
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60 fMaxWidth= maxLineWidth;
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61 fOffset= 0;
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62 fLine= null;
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63 fLineBreakIterator= BreakIterator.getLineInstance();
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64 fBreakWords= true;
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65 }
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66
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67 public bool isFormattedLine() {
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68 return fLine !is null;
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69 }
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70
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71 /**
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72 * Reads the next line. The lengths of the line will not exceed the given maximum
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73 * width.
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74 *
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75 * @return the next line
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76 * @throws IOException
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77 */
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78 public String readLine() {
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79 if (fLine is null) {
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80 String line= fReader.readLine();
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81 if (line is null)
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82 return null;
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83
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84 int lineLen= fGC.textExtent(line).x;
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85 if (lineLen < fMaxWidth) {
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86 return line;
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87 }
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88 fLine= line;
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89 fLineBreakIterator.setText(line);
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90 fOffset= 0;
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91 }
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92 int breakOffset= findNextBreakOffset(fOffset);
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93 String res;
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94 if (breakOffset !is BreakIterator.DONE) {
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95 res= fLine.substring(fOffset, breakOffset);
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96 fOffset= findWordBegin(breakOffset);
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97 if (fOffset is fLine.length()) {
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98 fLine= null;
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99 }
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100 } else {
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101 res= fLine.substring(fOffset);
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102 fLine= null;
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103 }
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104 return res;
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105 }
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106
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107 private int findNextBreakOffset(int currOffset) {
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108 int currWidth= 0;
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109 int nextOffset= fLineBreakIterator.following(currOffset);
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110 while (nextOffset !is BreakIterator.DONE) {
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111 String word= fLine.substring(currOffset, nextOffset);
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112 int wordWidth= fGC.textExtent(word).x;
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113 int nextWidth= wordWidth + currWidth;
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114 if (nextWidth > fMaxWidth) {
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115 if (currWidth > 0)
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116 return currOffset;
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117
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118 if (!fBreakWords)
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119 return nextOffset;
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120
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121 // need to fit into fMaxWidth
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122 int length= word.length();
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123 while (length >= 0) {
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124 length--;
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125 word= word.substring(0, length);
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126 wordWidth= fGC.textExtent(word).x;
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127 if (wordWidth + currWidth < fMaxWidth)
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128 return currOffset + length;
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129 }
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130 return nextOffset;
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131 }
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132 currWidth= nextWidth;
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133 currOffset= nextOffset;
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134 nextOffset= fLineBreakIterator.next();
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135 }
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136 return nextOffset;
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137 }
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138
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139 private int findWordBegin(int idx) {
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140 while (idx < fLine.length() && Character.isWhitespace(fLine.charAt(idx))) {
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141 idx++;
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142 }
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143 return idx;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
144 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
145 }