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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.html.SubstitutionTextReader;
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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.io.IOException;
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18 import java.io.Reader;
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19
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20
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21 /**
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22 * Reads the text contents from a reader and computes for each character
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23 * a potential substitution. The substitution may eat more characters than
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24 * only the one passed into the computation routine.
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25 * <p>
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26 * Moved into this package from <code>dwtx.jface.internal.text.revisions</code>.</p>
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27 */
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28 public abstract class SubstitutionTextReader : SingleCharReader {
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29
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30 protected static final String LINE_DELIM= System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$
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31
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32 private Reader fReader;
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33 protected bool fWasWhiteSpace;
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34 private int fCharAfterWhiteSpace;
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35
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36 /**
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37 * Tells whether white space characters are skipped.
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38 */
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39 private bool fSkipWhiteSpace= true;
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40
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41 private bool fReadFromBuffer;
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42 private StringBuffer fBuffer;
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43 private int fIndex;
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44
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45
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46 protected SubstitutionTextReader(Reader reader) {
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47 fReader= reader;
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48 fBuffer= new StringBuffer();
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49 fIndex= 0;
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50 fReadFromBuffer= false;
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51 fCharAfterWhiteSpace= -1;
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52 fWasWhiteSpace= true;
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53 }
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54
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55 /**
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56 * Computes the substitution for the given character and if necessary
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57 * subsequent characters. Implementation should use <code>nextChar</code>
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58 * to read subsequent characters.
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59 *
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60 * @param c the character to be substituted
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61 * @return the substitution for <code>c</code>
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62 * @throws IOException in case computing the substitution fails
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63 */
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64 protected abstract String computeSubstitution(int c) throws IOException;
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65
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66 /**
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67 * Returns the internal reader.
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68 *
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69 * @return the internal reader
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70 */
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71 protected Reader getReader() {
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72 return fReader;
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73 }
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74
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75 /**
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76 * Returns the next character.
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77 * @return the next character
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78 * @throws IOException in case reading the character fails
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79 */
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80 protected int nextChar() throws IOException {
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81 fReadFromBuffer= (fBuffer.length() > 0);
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82 if (fReadFromBuffer) {
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83 char ch= fBuffer.charAt(fIndex++);
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84 if (fIndex >= fBuffer.length()) {
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85 fBuffer.setLength(0);
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86 fIndex= 0;
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87 }
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88 return ch;
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89 }
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90
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91 int ch= fCharAfterWhiteSpace;
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92 if (ch is -1) {
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93 ch= fReader.read();
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94 }
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95 if (fSkipWhiteSpace && Character.isWhitespace((char)ch)) {
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96 do {
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97 ch= fReader.read();
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98 } while (Character.isWhitespace((char)ch));
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99 if (ch !is -1) {
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100 fCharAfterWhiteSpace= ch;
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101 return ' ';
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102 }
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103 } else {
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104 fCharAfterWhiteSpace= -1;
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105 }
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106 return ch;
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107 }
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108
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109 /**
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110 * @see Reader#read()
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111 */
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112 public int read() throws IOException {
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113 int c;
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114 do {
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115
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116 c= nextChar();
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117 while (!fReadFromBuffer) {
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118 String s= computeSubstitution(c);
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119 if (s is null)
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120 break;
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121 if (s.length() > 0)
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122 fBuffer.insert(0, s);
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123 c= nextChar();
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124 }
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125
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126 } while (fSkipWhiteSpace && fWasWhiteSpace && (c is ' '));
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127 fWasWhiteSpace= (c is ' ' || c is '\r' || c is '\n');
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128 return c;
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129 }
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130
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131 /**
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132 * @see Reader#ready()
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133 */
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134 public bool ready() throws IOException {
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135 return fReader.ready();
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136 }
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137
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138 /**
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139 * @see Reader#close()
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140 */
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141 public void close() throws IOException {
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142 fReader.close();
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143 }
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144
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145 /**
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146 * @see Reader#reset()
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147 */
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148 public void reset() throws IOException {
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149 fReader.reset();
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150 fWasWhiteSpace= true;
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151 fCharAfterWhiteSpace= -1;
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152 fBuffer.setLength(0);
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153 fIndex= 0;
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154 }
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155
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156 protected final void setSkipWhitespace(bool state) {
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157 fSkipWhiteSpace= state;
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158 }
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159
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160 protected final bool isSkippingWhitespace() {
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161 return fSkipWhiteSpace;
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162 }
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163 }
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