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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.text.ListLineTracker;
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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 java.util.ArrayList;
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18 import java.util.List;
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19
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20 import dwtx.jface.text.AbstractLineTracker.DelimiterInfo;
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21
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22 /**
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23 * Abstract, read-only implementation of <code>ILineTracker</code>. It lets the definition of
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24 * line delimiters to subclasses. Assuming that '\n' is the only line delimiter, this abstract
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25 * implementation defines the following line scheme:
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26 * <ul>
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27 * <li> "" -> [0,0]
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28 * <li> "a" -> [0,1]
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29 * <li> "\n" -> [0,1], [1,0]
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30 * <li> "a\n" -> [0,2], [2,0]
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31 * <li> "a\nb" -> [0,2], [2,1]
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32 * <li> "a\nbc\n" -> [0,2], [2,3], [5,0]
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33 * </ul>
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34 * This class must be subclassed.
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35 *
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36 * @since 3.2
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37 */
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38 abstract class ListLineTracker : ILineTracker {
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39
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40 /** The line information */
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41 private final List fLines= new ArrayList();
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42 /** The length of the tracked text */
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43 private int fTextLength;
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44
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45 /**
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46 * Creates a new line tracker.
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47 */
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48 protected ListLineTracker() {
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49 }
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50
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51 /**
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52 * Binary search for the line at a given offset.
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53 *
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54 * @param offset the offset whose line should be found
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55 * @return the line of the offset
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56 */
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57 private int findLine(int offset) {
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58
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59 if (fLines.size() is 0)
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60 return -1;
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61
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62 int left= 0;
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63 int right= fLines.size() - 1;
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64 int mid= 0;
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65 Line line= null;
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66
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67 while (left < right) {
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68
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69 mid= (left + right) / 2;
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70
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71 line= (Line) fLines.get(mid);
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72 if (offset < line.offset) {
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73 if (left is mid)
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74 right= left;
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75 else
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76 right= mid - 1;
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77 } else if (offset > line.offset) {
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78 if (right is mid)
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79 left= right;
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80 else
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81 left= mid + 1;
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82 } else if (offset is line.offset) {
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83 left= right= mid;
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84 }
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85 }
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86
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87 line= (Line) fLines.get(left);
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88 if (line.offset > offset)
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89 --left;
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90 return left;
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91 }
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92
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93 /**
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94 * Returns the number of lines covered by the specified text range.
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95 *
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96 * @param startLine the line where the text range starts
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97 * @param offset the start offset of the text range
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98 * @param length the length of the text range
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99 * @return the number of lines covered by this text range
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100 * @exception BadLocationException if range is undefined in this tracker
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101 */
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102 private int getNumberOfLines(int startLine, int offset, int length) throws BadLocationException {
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103
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104 if (length is 0)
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105 return 1;
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106
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107 int target= offset + length;
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108
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109 Line l= (Line) fLines.get(startLine);
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110
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111 if (l.delimiter is null)
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112 return 1;
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113
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114 if (l.offset + l.length > target)
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115 return 1;
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116
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117 if (l.offset + l.length is target)
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118 return 2;
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119
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120 return getLineNumberOfOffset(target) - startLine + 1;
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121 }
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122
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123 /*
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124 * @see dwtx.jface.text.ILineTracker#getLineLength(int)
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125 */
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126 public final int getLineLength(int line) throws BadLocationException {
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127 int lines= fLines.size();
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128
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129 if (line < 0 || line > lines)
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130 throw new BadLocationException();
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131
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132 if (lines is 0 || lines is line)
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133 return 0;
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134
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135 Line l= (Line) fLines.get(line);
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136 return l.length;
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137 }
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138
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139 /*
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140 * @see dwtx.jface.text.ILineTracker#getLineNumberOfOffset(int)
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141 */
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142 public final int getLineNumberOfOffset(int position) throws BadLocationException {
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143 if (position < 0 || position > fTextLength)
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144 throw new BadLocationException();
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145
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146 if (position is fTextLength) {
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147
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148 int lastLine= fLines.size() - 1;
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149 if (lastLine < 0)
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150 return 0;
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151
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152 Line l= (Line) fLines.get(lastLine);
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153 return (l.delimiter !is null ? lastLine + 1 : lastLine);
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154 }
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155
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156 return findLine(position);
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157 }
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158
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159 /*
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160 * @see dwtx.jface.text.ILineTracker#getLineInformationOfOffset(int)
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161 */
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162 public final IRegion getLineInformationOfOffset(int position) throws BadLocationException {
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163 if (position > fTextLength)
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164 throw new BadLocationException();
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165
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166 if (position is fTextLength) {
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167 int size= fLines.size();
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168 if (size is 0)
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169 return new Region(0, 0);
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170 Line l= (Line) fLines.get(size - 1);
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171 return (l.delimiter !is null ? new Line(fTextLength, 0) : new Line(fTextLength - l.length, l.length));
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172 }
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173
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174 return getLineInformation(findLine(position));
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175 }
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176
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177 /*
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178 * @see dwtx.jface.text.ILineTracker#getLineInformation(int)
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179 */
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180 public final IRegion getLineInformation(int line) throws BadLocationException {
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181 int lines= fLines.size();
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182
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183 if (line < 0 || line > lines)
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184 throw new BadLocationException();
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185
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186 if (lines is 0)
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187 return new Line(0, 0);
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188
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189 if (line is lines) {
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190 Line l= (Line) fLines.get(line - 1);
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191 return new Line(l.offset + l.length, 0);
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192 }
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193
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194 Line l= (Line) fLines.get(line);
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195 return (l.delimiter !is null ? new Line(l.offset, l.length - l.delimiter.length()) : l);
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196 }
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197
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198 /*
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199 * @see dwtx.jface.text.ILineTracker#getLineOffset(int)
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200 */
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201 public final int getLineOffset(int line) throws BadLocationException {
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202 int lines= fLines.size();
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203
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204 if (line < 0 || line > lines)
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205 throw new BadLocationException();
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206
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207 if (lines is 0)
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208 return 0;
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209
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210 if (line is lines) {
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211 Line l= (Line) fLines.get(line - 1);
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212 if (l.delimiter !is null)
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213 return l.offset + l.length;
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214 throw new BadLocationException();
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215 }
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216
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217 Line l= (Line) fLines.get(line);
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218 return l.offset;
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219 }
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220
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221 /*
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222 * @see dwtx.jface.text.ILineTracker#getNumberOfLines()
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223 */
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224 public final int getNumberOfLines() {
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225 int lines= fLines.size();
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226
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227 if (lines is 0)
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228 return 1;
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229
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230 Line l= (Line) fLines.get(lines - 1);
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231 return (l.delimiter !is null ? lines + 1 : lines);
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232 }
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233
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234 /*
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235 * @see dwtx.jface.text.ILineTracker#getNumberOfLines(int, int)
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236 */
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237 public final int getNumberOfLines(int position, int length) throws BadLocationException {
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238
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239 if (position < 0 || position + length > fTextLength)
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240 throw new BadLocationException();
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241
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242 if (length is 0) // optimization
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243 return 1;
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244
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245 return getNumberOfLines(getLineNumberOfOffset(position), position, length);
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246 }
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247
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248 /*
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249 * @see dwtx.jface.text.ILineTracker#computeNumberOfLines(java.lang.String)
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250 */
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251 public final int computeNumberOfLines(String text) {
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252 int count= 0;
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253 int start= 0;
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254 DelimiterInfo delimiterInfo= nextDelimiterInfo(text, start);
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255 while (delimiterInfo !is null && delimiterInfo.delimiterIndex > -1) {
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256 ++count;
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257 start= delimiterInfo.delimiterIndex + delimiterInfo.delimiterLength;
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258 delimiterInfo= nextDelimiterInfo(text, start);
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259 }
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260 return count;
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261 }
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262
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263 /*
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264 * @see dwtx.jface.text.ILineTracker#getLineDelimiter(int)
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265 */
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266 public final String getLineDelimiter(int line) throws BadLocationException {
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267 int lines= fLines.size();
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268
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269 if (line < 0 || line > lines)
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270 throw new BadLocationException();
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271
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272 if (lines is 0)
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273 return null;
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274
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275 if (line is lines)
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276 return null;
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277
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278 Line l= (Line) fLines.get(line);
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279 return l.delimiter;
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280 }
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281
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282 /**
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283 * Returns the information about the first delimiter found in the given text starting at the
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284 * given offset.
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285 *
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286 * @param text the text to be searched
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287 * @param offset the offset in the given text
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288 * @return the information of the first found delimiter or <code>null</code>
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289 */
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290 protected abstract DelimiterInfo nextDelimiterInfo(String text, int offset);
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291
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292 /**
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293 * Creates the line structure for the given text. Newly created lines are inserted into the line
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294 * structure starting at the given position. Returns the number of newly created lines.
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295 *
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296 * @param text the text for which to create a line structure
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297 * @param insertPosition the position at which the newly created lines are inserted into the
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298 * tracker's line structure
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299 * @param offset the offset of all newly created lines
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300 * @return the number of newly created lines
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301 */
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302 private int createLines(String text, int insertPosition, int offset) {
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303
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304 int count= 0;
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305 int start= 0;
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306 DelimiterInfo delimiterInfo= nextDelimiterInfo(text, 0);
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307
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308 while (delimiterInfo !is null && delimiterInfo.delimiterIndex > -1) {
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309
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310 int index= delimiterInfo.delimiterIndex + (delimiterInfo.delimiterLength - 1);
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311
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312 if (insertPosition + count >= fLines.size())
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313 fLines.add(new Line(offset + start, offset + index, delimiterInfo.delimiter));
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314 else
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315 fLines.add(insertPosition + count, new Line(offset + start, offset + index, delimiterInfo.delimiter));
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316
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317 ++count;
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318 start= index + 1;
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319 delimiterInfo= nextDelimiterInfo(text, start);
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320 }
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321
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322 if (start < text.length()) {
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323 if (insertPosition + count < fLines.size()) {
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324 // there is a line below the current
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325 Line l= (Line) fLines.get(insertPosition + count);
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326 int delta= text.length() - start;
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327 l.offset-= delta;
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328 l.length+= delta;
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329 } else {
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330 fLines.add(new Line(offset + start, offset + text.length() - 1, null));
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331 ++count;
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332 }
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333 }
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334
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335 return count;
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336 }
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337
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338 /*
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339 * @see dwtx.jface.text.ILineTracker#replace(int, int, java.lang.String)
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340 */
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341 public final void replace(int position, int length, String text) throws BadLocationException {
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342 throw new UnsupportedOperationException();
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343 }
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344
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345 /*
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346 * @see dwtx.jface.text.ILineTracker#set(java.lang.String)
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347 */
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348 public final void set(String text) {
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349 fLines.clear();
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350 if (text !is null) {
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351 fTextLength= text.length();
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352 createLines(text, 0, 0);
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353 }
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354 }
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355
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356 /**
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357 * Returns the internal data structure, a {@link List} of {@link Line}s. Used only by
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358 * {@link TreeLineTracker#TreeLineTracker(ListLineTracker)}.
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359 *
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360 * @return the internal list of lines.
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361 */
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362 final List getLines() {
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363 return fLines;
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364 }
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365 }
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