Mercurial > projects > dwt-win
annotate dwt/dnd/HTMLTransfer.d @ 341:f403c83322c3 default tip
fix: thx torhu
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 08 Nov 2009 20:58:32 +0100 |
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1 /******************************************************************************* |
246 | 2 * Copyright (c) 2000, 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 dwt.dnd.HTMLTransfer; |
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14 |
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15 import dwt.internal.ole.win32.COM; |
140 | 16 import dwt.internal.ole.win32.OBJIDL; |
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17 import dwt.internal.win32.OS; |
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18 |
140 | 19 import dwt.dnd.ByteArrayTransfer; |
20 import dwt.dnd.TransferData; | |
21 import dwt.dnd.DND; | |
22 | |
23 import dwt.dwthelper.utils; | |
24 static import tango.text.Text; | |
25 alias tango.text.Text.Text!(char) StringBuffer; | |
26 | |
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27 /** |
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28 * The class <code>HTMLTransfer</code> provides a platform specific mechanism |
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29 * for converting text in HTML format represented as a java <code>String</code> |
246 | 30 * to a platform specific representation of the data and vice versa. |
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31 * |
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32 * <p>An example of a java <code>String</code> containing HTML text is shown |
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33 * below:</p> |
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34 * |
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35 * <code><pre> |
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36 * String htmlData = "<p>This is a paragraph of text.</p>"; |
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37 * </code></pre> |
246 | 38 * |
39 * @see Transfer | |
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40 */ |
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41 public class HTMLTransfer : ByteArrayTransfer { |
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42 |
140 | 43 static HTMLTransfer _instance; |
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44 static const String HTML_FORMAT = "HTML Format"; //$NON-NLS-1$ |
140 | 45 static const int HTML_FORMATID; |
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46 static const String NUMBER = "00000000"; //$NON-NLS-1$ |
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47 static const String HEADER = "Version:0.9\r\nStartHTML:"~NUMBER~"\r\nEndHTML:"~NUMBER~"\r\nStartFragment:"~NUMBER~"\r\nEndFragment:"~NUMBER~"\r\n"; |
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48 static const String PREFIX = "<html><body><!--StartFragment-->"; //$NON-NLS-1$ |
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49 static const String SUFFIX = "<!--EndFragment--></body></html>"; //$NON-NLS-1$ |
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50 static const String StartFragment = "StartFragment:"; //$NON-NLS-1$ |
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51 static const String EndFragment = "EndFragment:"; //$NON-NLS-1$ |
140 | 52 |
53 static this(){ | |
54 HTML_FORMATID = registerType(HTML_FORMAT); | |
55 } | |
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56 |
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57 private this() {} |
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58 |
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59 /** |
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60 * Returns the singleton instance of the HTMLTransfer class. |
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61 * |
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62 * @return the singleton instance of the HTMLTransfer class |
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63 */ |
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64 public static HTMLTransfer getInstance () { |
140 | 65 if( _instance is null ){ |
66 synchronized { | |
67 if( _instance is null ){ | |
68 _instance = new HTMLTransfer(); | |
69 } | |
70 } | |
71 } | |
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72 return _instance; |
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73 } |
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74 |
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75 /** |
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76 * This implementation of <code>javaToNative</code> converts HTML-formatted text |
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77 * represented by a java <code>String</code> to a platform specific representation. |
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78 * |
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79 * @param object a java <code>String</code> containing HTML text |
246 | 80 * @param transferData an empty <code>TransferData</code> object that will |
81 * be filled in on return with the platform specific format of the data | |
82 * | |
83 * @see Transfer#nativeToJava | |
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84 */ |
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85 public void javaToNative (Object object, TransferData transferData){ |
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86 if (!checkHTML(object) || !isSupportedType(transferData)) { |
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87 DND.error(DND.ERROR_INVALID_DATA); |
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88 } |
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89 String string = ( cast(ArrayWrapperString)object ).array; |
213 | 90 /* NOTE: CF_HTML uses UTF-8 encoding. */ |
91 int cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, StrToTCHARz(string), -1, null, 0, null, null); | |
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92 if (cchMultiByte is 0) { |
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93 transferData.stgmedium = new STGMEDIUM(); |
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94 transferData.result = COM.DV_E_STGMEDIUM; |
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95 return; |
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96 } |
140 | 97 int startHTML = HEADER.length; |
98 int startFragment = startHTML + PREFIX.length; | |
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99 int endFragment = startFragment + cchMultiByte - 1; |
140 | 100 int endHTML = endFragment + SUFFIX.length; |
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101 |
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102 StringBuffer buffer = new StringBuffer(HEADER); |
140 | 103 int maxLength = NUMBER.length; |
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104 //startHTML |
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105 int start = buffer.toString().indexOf(NUMBER); |
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106 String temp = Integer.toString(startHTML); |
140 | 107 buffer.select(start + maxLength-temp.length, temp.length); |
108 buffer.replace(temp); | |
109 buffer.select(); | |
110 | |
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111 //endHTML |
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112 start = buffer.toString().indexOf(NUMBER, start); |
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113 temp = Integer.toString(endHTML); |
140 | 114 buffer.select(start + maxLength-temp.length, temp.length); |
115 buffer.replace( temp); | |
116 buffer.select(); | |
117 | |
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118 //startFragment |
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119 start = buffer.toString().indexOf(NUMBER, start); |
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120 temp = Integer.toString(startFragment); |
140 | 121 buffer.select(start + maxLength-temp.length, temp.length); |
122 buffer.replace(temp); | |
123 buffer.select(); | |
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124 //endFragment |
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125 start = buffer.toString().indexOf(NUMBER, start); |
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126 temp = Integer.toString(endFragment); |
140 | 127 buffer.select(start + maxLength-temp.length, temp.length); |
128 buffer.replace(temp); | |
129 buffer.select(); | |
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130 |
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131 buffer.append(PREFIX); |
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132 buffer.append(string); |
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133 buffer.append(SUFFIX); |
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134 |
213 | 135 auto wstrz = StrToTCHARz(OS.CP_UTF8,buffer.toString); |
136 cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, wstrz, -1, null, 0, null, null); | |
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137 auto lpMultiByteStr = cast(PCHAR) OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte); |
213 | 138 OS.WideCharToMultiByte(OS.CP_UTF8, 0, wstrz, -1, lpMultiByteStr, cchMultiByte, null, null); |
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139 transferData.stgmedium = new STGMEDIUM(); |
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140 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
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141 transferData.stgmedium.unionField = lpMultiByteStr; |
140 | 142 transferData.stgmedium.pUnkForRelease = null; |
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143 transferData.result = COM.S_OK; |
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144 return; |
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145 } |
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146 |
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147 /** |
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148 * This implementation of <code>nativeToJava</code> converts a platform specific |
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149 * representation of HTML text to a java <code>String</code>. |
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150 * |
246 | 151 * @param transferData the platform specific representation of the data to be converted |
152 * @return a java <code>String</code> containing HTML text if the conversion was successful; | |
153 * otherwise null | |
154 * | |
155 * @see Transfer#javaToNative | |
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156 */ |
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157 public Object nativeToJava(TransferData transferData){ |
140 | 158 if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null; |
159 IDataObject data = transferData.pIDataObject; | |
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160 data.AddRef(); |
140 | 161 STGMEDIUM* stgmedium = new STGMEDIUM(); |
162 FORMATETC* formatetc = transferData.formatetc; | |
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163 stgmedium.tymed = COM.TYMED_HGLOBAL; |
320 | 164 transferData.result = getData(data, formatetc, stgmedium); |
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165 data.Release(); |
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166 if (transferData.result !is COM.S_OK) return null; |
140 | 167 auto hMem = stgmedium.unionField; |
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168 |
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169 try { |
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170 auto lpMultiByteStr = cast(PCHAR) OS.GlobalLock(hMem); |
140 | 171 if (lpMultiByteStr is null) return null; |
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172 try { |
213 | 173 /* NOTE: CF_HTML uses UTF-8 encoding. |
174 * The MSDN documentation for MultiByteToWideChar states that dwFlags must be set to 0 for UTF-8. | |
175 * Otherwise, the function fails with ERROR_INVALID_FLAGS. */ | |
176 auto cchWideChar = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, null, 0); | |
135
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177 if (cchWideChar is 0) return null; |
140 | 178 wchar[] lpWideCharStr = new wchar [cchWideChar - 1]; |
213 | 179 OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, lpWideCharStr.ptr, lpWideCharStr.length); |
212
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180 String string = WCHARzToStr(lpWideCharStr.ptr); |
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181 int fragmentStart = 0, fragmentEnd = 0; |
140 | 182 int start = string.indexOf(StartFragment) + StartFragment.length; |
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183 int end = start + 1; |
140 | 184 while (end < string.length) { |
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185 String s = string.substring(start, end); |
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186 try { |
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187 fragmentStart = Integer.parseInt(s); |
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188 end++; |
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189 } catch (NumberFormatException e) { |
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190 break; |
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191 } |
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192 } |
140 | 193 start = string.indexOf(EndFragment) + EndFragment.length; |
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194 end = start + 1; |
140 | 195 while (end < string.length) { |
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196 String s = string.substring(start, end); |
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197 try { |
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198 fragmentEnd = Integer.parseInt(s); |
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199 end++; |
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200 } catch (NumberFormatException e) { |
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201 break; |
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202 } |
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203 } |
213 | 204 if (fragmentEnd <= fragmentStart || fragmentEnd > OS.strlen(lpMultiByteStr)) return null; |
205 cchWideChar = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr+fragmentStart, fragmentEnd - fragmentStart, lpWideCharStr.ptr, lpWideCharStr.length); | |
206 if (cchWideChar is 0) return null; | |
207 String s = TCHARsToStr( lpWideCharStr[ 0 .. cchWideChar ] ); | |
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208 /* |
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209 * Firefox includes <!--StartFragment --> in the fragment, so remove it. |
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210 */ |
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211 String foxStart = "<!--StartFragment -->\r\n"; //$NON-NLS-1$ |
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212 int prefix = s.indexOf(foxStart); |
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213 if (prefix !is -1) { |
140 | 214 prefix += foxStart.length; |
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215 s = s.substring(prefix); |
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216 } |
140 | 217 return new ArrayWrapperString(s); |
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218 } finally { |
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219 OS.GlobalUnlock(hMem); |
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220 } |
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221 } finally { |
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222 OS.GlobalFree(hMem); |
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223 } |
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224 } |
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225 protected int[] getTypeIds(){ |
140 | 226 return [HTML_FORMATID]; |
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227 } |
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228 protected String[] getTypeNames(){ |
140 | 229 return [HTML_FORMAT]; |
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230 } |
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231 bool checkHTML(Object object) { |
140 | 232 if( auto ws = cast(ArrayWrapperString)object ){ |
233 return ws.array.length > 0; | |
234 } | |
235 return false; | |
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236 } |
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237 protected bool validate(Object object) { |
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238 return checkHTML(object); |
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239 } |
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240 } |