Mercurial > projects > dwt-addons
annotate dwtx/jface/internal/text/html/SubstitutionTextReader.d @ 158:25f1f92fa3df
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| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Tue, 26 Aug 2008 02:46:34 +0200 |
| parents | 93a6ec48fd28 |
| children | 7926b636c282 |
| rev | line source |
|---|---|
| 129 | 1 /******************************************************************************* |
| 2 * Copyright (c) 2000, 2006 IBM Corporation and others. | |
| 3 * All rights reserved. This program and the accompanying materials | |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 10 * Port to the D programming language: | |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 12 *******************************************************************************/ | |
| 13 module dwtx.jface.internal.text.html.SubstitutionTextReader; | |
| 14 | |
| 131 | 15 import dwtx.jface.internal.text.html.HTML2TextReader; // packageimport |
| 16 import dwtx.jface.internal.text.html.HTMLPrinter; // packageimport | |
| 17 import dwtx.jface.internal.text.html.BrowserInformationControl; // packageimport | |
| 18 import dwtx.jface.internal.text.html.HTMLTextPresenter; // packageimport | |
| 19 import dwtx.jface.internal.text.html.BrowserInput; // packageimport | |
| 20 import dwtx.jface.internal.text.html.SingleCharReader; // packageimport | |
| 21 import dwtx.jface.internal.text.html.BrowserInformationControlInput; // packageimport | |
| 22 import dwtx.jface.internal.text.html.HTMLMessages; // packageimport | |
| 23 | |
| 24 | |
| 129 | 25 import dwt.dwthelper.utils; |
| 26 | |
| 27 /** | |
| 28 * Reads the text contents from a reader and computes for each character | |
| 29 * a potential substitution. The substitution may eat more characters than | |
| 30 * only the one passed into the computation routine. | |
| 31 * <p> | |
| 32 * Moved into this package from <code>dwtx.jface.internal.text.revisions</code>.</p> | |
| 33 */ | |
| 34 public abstract class SubstitutionTextReader : SingleCharReader { | |
| 35 | |
| 36 protected static final String LINE_DELIM= System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$ | |
| 37 | |
| 38 private Reader fReader; | |
| 39 protected bool fWasWhiteSpace; | |
| 40 private int fCharAfterWhiteSpace; | |
| 41 | |
| 42 /** | |
| 43 * Tells whether white space characters are skipped. | |
| 44 */ | |
| 45 private bool fSkipWhiteSpace= true; | |
| 46 | |
| 47 private bool fReadFromBuffer; | |
| 48 private StringBuffer fBuffer; | |
| 49 private int fIndex; | |
| 50 | |
| 51 | |
|
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52 protected this(Reader reader) { |
| 129 | 53 fReader= reader; |
| 54 fBuffer= new StringBuffer(); | |
| 55 fIndex= 0; | |
| 56 fReadFromBuffer= false; | |
| 57 fCharAfterWhiteSpace= -1; | |
| 58 fWasWhiteSpace= true; | |
| 59 } | |
| 60 | |
| 61 /** | |
| 62 * Computes the substitution for the given character and if necessary | |
| 63 * subsequent characters. Implementation should use <code>nextChar</code> | |
| 64 * to read subsequent characters. | |
| 65 * | |
| 66 * @param c the character to be substituted | |
| 67 * @return the substitution for <code>c</code> | |
| 68 * @throws IOException in case computing the substitution fails | |
| 69 */ | |
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70 protected abstract String computeSubstitution(int c) ; |
| 129 | 71 |
| 72 /** | |
| 73 * Returns the internal reader. | |
| 74 * | |
| 75 * @return the internal reader | |
| 76 */ | |
| 77 protected Reader getReader() { | |
| 78 return fReader; | |
| 79 } | |
| 80 | |
| 81 /** | |
| 82 * Returns the next character. | |
| 83 * @return the next character | |
| 84 * @throws IOException in case reading the character fails | |
| 85 */ | |
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86 protected int nextChar() { |
| 129 | 87 fReadFromBuffer= (fBuffer.length() > 0); |
| 88 if (fReadFromBuffer) { | |
| 89 char ch= fBuffer.charAt(fIndex++); | |
| 90 if (fIndex >= fBuffer.length()) { | |
| 91 fBuffer.setLength(0); | |
| 92 fIndex= 0; | |
| 93 } | |
| 94 return ch; | |
| 95 } | |
| 96 | |
| 97 int ch= fCharAfterWhiteSpace; | |
| 98 if (ch is -1) { | |
| 99 ch= fReader.read(); | |
| 100 } | |
| 134 | 101 if (fSkipWhiteSpace && Character.isWhitespace(cast(wchar)ch)) { |
| 129 | 102 do { |
| 103 ch= fReader.read(); | |
| 134 | 104 } while (Character.isWhitespace(cast(wchar)ch)); |
| 129 | 105 if (ch !is -1) { |
| 106 fCharAfterWhiteSpace= ch; | |
| 107 return ' '; | |
| 108 } | |
| 109 } else { | |
| 110 fCharAfterWhiteSpace= -1; | |
| 111 } | |
| 112 return ch; | |
| 113 } | |
| 114 | |
| 115 /** | |
| 116 * @see Reader#read() | |
| 117 */ | |
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118 public int read() { |
| 129 | 119 int c; |
| 120 do { | |
| 121 | |
| 122 c= nextChar(); | |
| 123 while (!fReadFromBuffer) { | |
| 124 String s= computeSubstitution(c); | |
| 125 if (s is null) | |
| 126 break; | |
| 127 if (s.length() > 0) | |
| 128 fBuffer.insert(0, s); | |
| 129 c= nextChar(); | |
| 130 } | |
| 131 | |
| 132 } while (fSkipWhiteSpace && fWasWhiteSpace && (c is ' ')); | |
| 133 fWasWhiteSpace= (c is ' ' || c is '\r' || c is '\n'); | |
| 134 return c; | |
| 135 } | |
| 136 | |
| 137 /** | |
| 138 * @see Reader#ready() | |
| 139 */ | |
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140 public bool ready() { |
| 129 | 141 return fReader.ready(); |
| 142 } | |
| 143 | |
| 144 /** | |
| 145 * @see Reader#close() | |
| 146 */ | |
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147 public void close() { |
| 129 | 148 fReader.close(); |
| 149 } | |
| 150 | |
| 151 /** | |
| 152 * @see Reader#reset() | |
| 153 */ | |
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154 public void reset() { |
| 129 | 155 fReader.reset(); |
| 156 fWasWhiteSpace= true; | |
| 157 fCharAfterWhiteSpace= -1; | |
| 158 fBuffer.setLength(0); | |
| 159 fIndex= 0; | |
| 160 } | |
| 161 | |
| 162 protected final void setSkipWhitespace(bool state) { | |
| 163 fSkipWhiteSpace= state; | |
| 164 } | |
| 165 | |
| 166 protected final bool isSkippingWhitespace() { | |
| 167 return fSkipWhiteSpace; | |
| 168 } | |
| 169 } |