Mercurial > projects > dwt-addons
annotate dwtx/jface/internal/text/html/SubstitutionTextReader.d @ 162:1a5b8f8129df
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| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Mon, 08 Sep 2008 00:51:37 +0200 |
| parents | 7926b636c282 |
| children |
| rev | line source |
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| 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 | |
| 129 | 24 import dwt.dwthelper.utils; |
| 162 | 25 import tango.core.Exception; |
| 129 | 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 | |
| 159 | 36 private static String LINE_DELIM_; |
| 37 protected static String LINE_DELIM() { | |
| 38 if( LINE_DELIM_ is null ){ | |
| 39 LINE_DELIM_ = System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$ | |
| 40 } | |
| 41 return LINE_DELIM_; | |
| 42 } | |
| 129 | 43 |
| 44 private Reader fReader; | |
| 45 protected bool fWasWhiteSpace; | |
| 46 private int fCharAfterWhiteSpace; | |
| 47 | |
| 48 /** | |
| 49 * Tells whether white space characters are skipped. | |
| 50 */ | |
| 51 private bool fSkipWhiteSpace= true; | |
| 52 | |
| 53 private bool fReadFromBuffer; | |
| 54 private StringBuffer fBuffer; | |
| 55 private int fIndex; | |
| 56 | |
| 57 | |
|
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58 protected this(Reader reader) { |
| 129 | 59 fReader= reader; |
| 60 fBuffer= new StringBuffer(); | |
| 61 fIndex= 0; | |
| 62 fReadFromBuffer= false; | |
| 63 fCharAfterWhiteSpace= -1; | |
| 64 fWasWhiteSpace= true; | |
| 65 } | |
| 66 | |
| 67 /** | |
| 68 * Computes the substitution for the given character and if necessary | |
| 69 * subsequent characters. Implementation should use <code>nextChar</code> | |
| 70 * to read subsequent characters. | |
| 71 * | |
| 72 * @param c the character to be substituted | |
| 73 * @return the substitution for <code>c</code> | |
| 74 * @throws IOException in case computing the substitution fails | |
| 75 */ | |
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76 protected abstract String computeSubstitution(int c) ; |
| 129 | 77 |
| 78 /** | |
| 79 * Returns the internal reader. | |
| 80 * | |
| 81 * @return the internal reader | |
| 82 */ | |
| 83 protected Reader getReader() { | |
| 84 return fReader; | |
| 85 } | |
| 86 | |
| 87 /** | |
| 88 * Returns the next character. | |
| 89 * @return the next character | |
| 90 * @throws IOException in case reading the character fails | |
| 91 */ | |
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92 protected int nextChar() { |
| 129 | 93 fReadFromBuffer= (fBuffer.length() > 0); |
| 94 if (fReadFromBuffer) { | |
| 162 | 95 char ch= fBuffer.slice().charAt(fIndex++); |
| 129 | 96 if (fIndex >= fBuffer.length()) { |
| 162 | 97 fBuffer.truncate(0); |
| 129 | 98 fIndex= 0; |
| 99 } | |
| 100 return ch; | |
| 101 } | |
| 102 | |
| 103 int ch= fCharAfterWhiteSpace; | |
| 104 if (ch is -1) { | |
| 105 ch= fReader.read(); | |
| 106 } | |
| 162 | 107 if (fSkipWhiteSpace && Character.isWhitespace(cast(char)ch)) { |
| 129 | 108 do { |
| 109 ch= fReader.read(); | |
| 162 | 110 } while (Character.isWhitespace(cast(char)ch)); |
| 129 | 111 if (ch !is -1) { |
| 112 fCharAfterWhiteSpace= ch; | |
| 113 return ' '; | |
| 114 } | |
| 115 } else { | |
| 116 fCharAfterWhiteSpace= -1; | |
| 117 } | |
| 118 return ch; | |
| 119 } | |
| 120 | |
| 162 | 121 /// DWT |
| 122 protected int nextDChar() { | |
| 123 char[4] buf = void; | |
| 124 int ch1 = nextChar(); | |
| 125 if( ch1 is -1 ) return -1; | |
| 126 buf[0] = cast(char)ch1; | |
| 127 if(( ch1 & 0x80 ) is 0x00 ){ | |
| 128 return ch1; | |
| 129 } | |
| 130 else if(( ch1 & 0xE0 ) is 0xC0 ){ | |
| 131 int ch2 = nextChar(); | |
| 132 if( ch2 is -1 ) throw new UnicodeException(__FILE__,__LINE__); | |
| 133 buf[1] = cast(char)ch2; | |
| 134 } | |
| 135 else if(( ch1 & 0xF0 ) is 0xE0 ){ | |
| 136 int ch2 = nextChar(); | |
| 137 if( ch1 is -1 ) throw new UnicodeException(__FILE__,__LINE__); | |
| 138 buf[1] = cast(char)ch2; | |
| 139 int ch3 = nextChar(); | |
| 140 if( ch3 is -1 ) throw new UnicodeException(__FILE__,__LINE__); | |
| 141 buf[2] = cast(char)ch3; | |
| 142 } | |
| 143 else if(( ch1 & 0xF8 ) is 0xF0 ){ | |
| 144 int ch2 = nextChar(); | |
| 145 if( ch1 is -1 ) throw new UnicodeException(__FILE__,__LINE__); | |
| 146 buf[1] = cast(char)ch2; | |
| 147 int ch3 = nextChar(); | |
| 148 if( ch3 is -1 ) throw new UnicodeException(__FILE__,__LINE__); | |
| 149 buf[2] = cast(char)ch3; | |
| 150 int ch4 = nextChar(); | |
| 151 if( ch4 is -1 ) throw new UnicodeException(__FILE__,__LINE__); | |
| 152 buf[3] = cast(char)ch4; | |
| 153 } | |
| 154 else { | |
| 155 throw new UnicodeException(__FILE__,__LINE__); | |
| 156 } | |
| 157 uint ate; | |
| 158 return tango.text.convert.Utf.decode( buf, ate ); | |
| 159 } | |
| 160 | |
| 129 | 161 /** |
| 162 * @see Reader#read() | |
| 163 */ | |
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164 public int read() { |
| 129 | 165 int c; |
| 166 do { | |
| 167 | |
| 168 c= nextChar(); | |
| 169 while (!fReadFromBuffer) { | |
| 170 String s= computeSubstitution(c); | |
| 171 if (s is null) | |
| 172 break; | |
| 162 | 173 if (s.length() > 0){ |
| 174 fBuffer.select(0, 0); | |
| 175 fBuffer.replace(s); | |
| 176 } | |
| 129 | 177 c= nextChar(); |
| 178 } | |
| 179 | |
| 180 } while (fSkipWhiteSpace && fWasWhiteSpace && (c is ' ')); | |
| 181 fWasWhiteSpace= (c is ' ' || c is '\r' || c is '\n'); | |
| 182 return c; | |
| 183 } | |
| 184 | |
| 185 /** | |
| 186 * @see Reader#ready() | |
| 187 */ | |
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188 public bool ready() { |
| 129 | 189 return fReader.ready(); |
| 190 } | |
| 191 | |
| 192 /** | |
| 193 * @see Reader#close() | |
| 194 */ | |
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195 public void close() { |
| 129 | 196 fReader.close(); |
| 197 } | |
| 198 | |
| 199 /** | |
| 200 * @see Reader#reset() | |
| 201 */ | |
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202 public void reset() { |
| 129 | 203 fReader.reset(); |
| 204 fWasWhiteSpace= true; | |
| 205 fCharAfterWhiteSpace= -1; | |
| 162 | 206 fBuffer.truncate(0); |
| 129 | 207 fIndex= 0; |
| 208 } | |
| 209 | |
| 210 protected final void setSkipWhitespace(bool state) { | |
| 211 fSkipWhiteSpace= state; | |
| 212 } | |
| 213 | |
| 214 protected final bool isSkippingWhitespace() { | |
| 215 return fSkipWhiteSpace; | |
| 216 } | |
| 217 } |