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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 dwtx.jface.internal.text.link.contentassist.LineBreakingReader;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18 import java.io.BufferedReader;
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19 import java.io.IOException;
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20 import java.io.Reader;
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21
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22 import com.ibm.icu.text.BreakIterator;
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23
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24 import dwt.graphics.GC;
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25
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26 /*
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27 * Not a real reader. Could change if requested
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28 */
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29 public class LineBreakingReader {
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30
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31 private BufferedReader fReader;
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32 private GC fGC;
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33 private int fMaxWidth;
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34
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35 private String fLine;
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36 private int fOffset;
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37
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38 private BreakIterator fLineBreakIterator;
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39 private bool fBreakWords;
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40
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41 /**
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42 * Creates a reader that breaks an input text to fit in a given width.
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43 *
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44 * @param reader Reader of the input text
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45 * @param gc The graphic context that defines the currently used font sizes
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46 * @param maxLineWidth The max width (pixels) where the text has to fit in
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47 */
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48 public LineBreakingReader(Reader reader, GC gc, int maxLineWidth) {
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49 fReader= new BufferedReader(reader);
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50 fGC= gc;
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51 fMaxWidth= maxLineWidth;
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52 fOffset= 0;
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53 fLine= null;
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54 fLineBreakIterator= BreakIterator.getLineInstance();
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55 fBreakWords= true;
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56 }
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57
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58 public bool isFormattedLine() {
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59 return fLine !is null;
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60 }
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61
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62 /**
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63 * Reads the next line. The lengths of the line will not exceed the given maximum
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64 * width.
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65 *
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66 * @return the next line
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67 * @throws IOException
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68 */
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69 public String readLine() throws IOException {
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70 if (fLine is null) {
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71 String line= fReader.readLine();
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72 if (line is null)
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73 return null;
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74
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75 int lineLen= fGC.textExtent(line).x;
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76 if (lineLen < fMaxWidth) {
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77 return line;
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78 }
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79 fLine= line;
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80 fLineBreakIterator.setText(line);
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81 fOffset= 0;
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82 }
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83 int breakOffset= findNextBreakOffset(fOffset);
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84 String res;
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85 if (breakOffset !is BreakIterator.DONE) {
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86 res= fLine.substring(fOffset, breakOffset);
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87 fOffset= findWordBegin(breakOffset);
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88 if (fOffset is fLine.length()) {
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89 fLine= null;
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90 }
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91 } else {
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92 res= fLine.substring(fOffset);
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93 fLine= null;
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94 }
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95 return res;
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96 }
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97
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98 private int findNextBreakOffset(int currOffset) {
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99 int currWidth= 0;
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100 int nextOffset= fLineBreakIterator.following(currOffset);
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101 while (nextOffset !is BreakIterator.DONE) {
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102 String word= fLine.substring(currOffset, nextOffset);
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103 int wordWidth= fGC.textExtent(word).x;
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104 int nextWidth= wordWidth + currWidth;
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105 if (nextWidth > fMaxWidth) {
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106 if (currWidth > 0)
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107 return currOffset;
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108
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109 if (!fBreakWords)
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110 return nextOffset;
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111
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112 // need to fit into fMaxWidth
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113 int length= word.length();
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114 while (length >= 0) {
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115 length--;
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116 word= word.substring(0, length);
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117 wordWidth= fGC.textExtent(word).x;
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118 if (wordWidth + currWidth < fMaxWidth)
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119 return currOffset + length;
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120 }
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121 return nextOffset;
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122 }
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123 currWidth= nextWidth;
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124 currOffset= nextOffset;
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125 nextOffset= fLineBreakIterator.next();
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126 }
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127 return nextOffset;
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128 }
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129
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130 private int findWordBegin(int idx) {
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131 while (idx < fLine.length() && Character.isWhitespace(fLine.charAt(idx))) {
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132 idx++;
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133 }
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134 return idx;
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135 }
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136 }
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