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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/text/BidiProcessor.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
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1 /*******************************************************************************
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2 * Copyright (c) 2004, 2008 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.draw2d.text.BidiProcessor;
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14
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15 import java.lang.all;
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16 import java.util.ArrayList;
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17 import java.util.List;
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18
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19 import org.eclipse.swt.SWT;
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20 import org.eclipse.swt.graphics.TextLayout;
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21 import org.eclipse.draw2d.text.FlowFigure;
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22 import org.eclipse.draw2d.text.BidiInfo;
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23 import org.eclipse.draw2d.text.FlowUtilities;
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24
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25 class Bidi{
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26 public static bool requiresBidi( char[], int, int ){
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27 return false;
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28 }
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29 }
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30
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31 /**
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32 * A helper class for a BlockFlow that does Bidi evaluation of all the text in that block.
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33 * <p>
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34 * WARNING: This class is for INTERNAL use only.
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35 * @author Pratik Shah
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36 * @since 3.1
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37 */
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38 public final class BidiProcessor {
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39
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40 /*
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41 * $TODO Workaround for Carbon. AWT DLL cannot start properly on carbon.
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42 * Waiting for bug 82104
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43 */
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44 private static bool isMacOS(){
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45 return SWT.getPlatform().equals("carbon"); //$NON-NLS-1$
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46 }
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47
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48 /**
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49 * A helper class to hold information about contributions made to this processor.
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50 *
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51 * @author Pratik Shah
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52 * @since 3.1
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53 */
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54 private static class BidiEntry {
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55 int begin, end;
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56 FlowFigure fig;
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57 this(FlowFigure fig, int offset, int length) {
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58 this.fig = fig;
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59 this.begin = offset;
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60 this.end = offset + length;
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61 }
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62 }
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63
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64 /**
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65 * A singleton instance.
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66 */
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67 private static BidiProcessor INSTANCE_;
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68 public static BidiProcessor INSTANCE(){
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69 if( INSTANCE_ is null ){
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70 synchronized( BidiProcessor.classinfo ){
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71 if( INSTANCE_ is null ){
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72 INSTANCE_ = new BidiProcessor();
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73 }
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74 }
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75 }
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76 return INSTANCE_;
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77 }
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78
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79 private StringBuffer bidiText;
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80 private List list;
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81 private int orientation = SWT.LEFT_TO_RIGHT;
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82
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83 private this() {
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84 list = new ArrayList();
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85 }
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86
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87 /**
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88 * Records a String contribution for this bidi context. Contributions are
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89 * concatenated (in the order that they were contributed) to make the final
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90 * String which will determine the bidi info for all contributors.
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91 * @param fig the figure that is contributing the given text
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92 * @param str the text contributed by the given figure
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93 * @see #addControlChar(char)
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94 */
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95 public void add(FlowFigure fig, String str) {
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96 //We are currently tracking empty contributions ("")
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97 list.add(new BidiEntry(fig, bidiText.length(), str.length));
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98 bidiText.append(str);
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99 }
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100
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101 /**
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102 * Records a character contribution for this bidi context. Contributions are
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103 * concatenated (in the order that they were contributed) to make the final
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104 * String which will determine the bidi info for all contributors.
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105 * @param fig the figure that is contributing the given text
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106 * @param c the character being added
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107 * @see #addControlChar(char)
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108 */
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109 public void add(FlowFigure fig, dchar c) {
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110 auto str = dcharToString(c);
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111 list.add(new BidiEntry(fig, bidiText.length(), str.length));
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112 bidiText.append(str);
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113 }
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114
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115 /**
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116 * This methods allows FlowFigures to contribute text that may effect the bidi evaluation,
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117 * but is not text that is visible on the screen. The bidi level of such text is
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118 * reported back to the contributing figure.
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119 *
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120 * @param c the control character
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121 */
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122 public void addControlChar(dchar c) {
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123 bidiText.append(dcharToString(c));
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124 }
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125
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126 /**
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127 * Breaks the given int array into bidi levels for each figure based on their
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128 * contributed text, and assigns those levels to each figure. Also determines
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129 * if shaping needs to occur between figures and sets the appendJoiner, prependJoiner
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130 * accordingly.
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131 *
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132 * @param levels the calculated levels of all the text in the block
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133 */
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134 private void assignResults(int[] levels) {
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135 BidiEntry prevEntry = null, entry = null;
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136 BidiInfo prevInfo = null, info = null;
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137 int end = 2, start = 0;
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138 for (int i = 0; i < list.size(); i++) {
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139 entry = cast(BidiEntry)list.get(i);
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140 info = new BidiInfo();
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141
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142 while (levels[end] < entry.end)
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143 end += 2;
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144
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145 int levelInfo[];
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146 if (end is start) {
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147 levelInfo = new int[1];
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148 if (prevInfo !is null)
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149 levelInfo[0] = prevInfo.levelInfo[prevInfo.levelInfo.length - 1];
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150 else
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151 levelInfo[0] = (orientation is SWT.LEFT_TO_RIGHT) ? 0 : 1;
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152 } else {
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153 levelInfo = new int[end - start - 1];
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154 System.arraycopy(levels, start + 1, levelInfo, 0, levelInfo.length);
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155 }
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156 for (int j = 1; j < levelInfo.length; j += 2)
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157 levelInfo[j] -= entry.begin;
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158 info.levelInfo = levelInfo;
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159
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160 // Compare current and previous for joiners, and commit previous BidiInfo.
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161 if (prevEntry !is null) {
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162 if (// if we started in the middle of a level run
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163 levels[start] < entry.begin
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164 // and the level run is odd
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165 && levels[start + 1] % 2 is 1
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166 // and the first character of this figure is Arabic
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167 && isJoiner(entry.begin)
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168 // and the last character of the previous figure was Arabic
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169 && isPrecedingJoiner(entry.begin))
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170 prevInfo.trailingJoiner = info.leadingJoiner = true;
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171 prevEntry.fig.setBidiInfo(prevInfo);
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172 }
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173 prevEntry = entry;
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174 prevInfo = info;
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175 if (entry.end is levels[end])
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176 start = end;
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177 else
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178 start = end - 2;
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179 }
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180 if (entry !is null)
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181 entry.fig.setBidiInfo(info);
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182 }
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183
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184 private bool isJoiner(int begin) {
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185 return begin < bidiText.length && isJoiningCharacter(bidiText.slice()[begin.. $].firstCodePoint());
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186 }
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187
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188 /**
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189 * @param the character to be evaluated
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190 * @return <code>true</code> if the given character is Arabic or ZWJ
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191 */
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192 private bool isJoiningCharacter(dchar c) {
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193 return false;
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194 //FIXME: SWT Missing functionality
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195 // return Character.getDirectionality(c) is Character.DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC
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196 // || c is BidiChars.ZWJ;
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197 }
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198
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199 private bool isPrecedingJoiner(int begin) {
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200 return begin > 0 && isJoiningCharacter(bidiText.slice()[begin - 1..$].firstCodePoint());
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201 }
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202
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203 /**
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204 * Processes the contributed text, determines the Bidi levels, and assigns them to
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205 * the FlowFigures that made thet contributions. This class is for INTERNAL use
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206 * only. Shaping of visually contiguous Arabic characters that are split in different
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207 * figures is also handled. This method will do nothing if the contributed text does not
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208 * require Bidi evaluation. All contributions are discarded at the end of this method.
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209 */
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210 public void process() {
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211 try {
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212 if (bidiText.length is 0 || isMacOS)
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213 return;
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214 char[] chars = bidiText.slice().dup;
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215
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216 if (orientation !is SWT.RIGHT_TO_LEFT
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217 && !Bidi.requiresBidi(chars, 0, chars.length - 1))
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218 return;
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219
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220 int[] levels = new int[15];
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221 TextLayout layout = FlowUtilities.getTextLayout();
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222
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223 layout.setOrientation(orientation);
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224 layout.setText(bidiText.toString());
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225 int j = 0, offset, prevLevel = -1;
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226 for (offset = 0; offset < chars.length; offset++) {
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227 int newLevel = layout.getLevel(offset);
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228 if (newLevel !is prevLevel) {
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229 if (j + 3 > levels.length) {
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230 int temp[] = levels;
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231 levels = new int[levels.length * 2 + 1];
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232 System.arraycopy(temp, 0, levels, 0, temp.length);
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233 }
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234 levels[j++] = offset;
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235 levels[j++] = newLevel;
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236 prevLevel = newLevel;
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237 }
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238 }
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239 levels[j++] = offset;
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240
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241 if (j !is levels.length) {
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242 int[] newLevels = new int[j];
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243 System.arraycopy(levels, 0, newLevels, 0, j);
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244 levels = newLevels;
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245 }
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246 assignResults(levels);
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247
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248 // reset the orientation of the layout, in case it was set to RTL
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249 layout.setOrientation(SWT.LEFT_TO_RIGHT);
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250 } finally {
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251 //will cause the fields to be reset for the next string to be processed
16
dbfb303e8fb0 first complete successful compile (win-only)
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252 bidiText = null;
12
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253 list.clear();
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254 }
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255 }
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256
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257 /**
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258 * Sets the paragraph embedding. The given orientation will be used on TextLayout
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259 * when determining the Bidi levels.
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260 *
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261 * @param newOrientation SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT
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262 */
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263 public void setOrientation(int newOrientation) {
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264 bidiText = new StringBuffer();
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265 list.clear();
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266 orientation = newOrientation;
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267 }
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268
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269 }