1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 1999 Antti Koivisto (koivisto (at) kde.org) 4 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public License 17 * along with this library; see the file COPYING.LIB. If not, write to 18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 */ 21 22 #include "config.h" 23 #include "CharacterData.h" 24 25 #include "EventNames.h" 26 #include "ExceptionCode.h" 27 #include "InspectorInstrumentation.h" 28 #include "MutationEvent.h" 29 #include "RenderText.h" 30 #include "TextBreakIterator.h" 31 32 using namespace std; 33 34 namespace WebCore { 35 36 void CharacterData::setData(const String& data, ExceptionCode&) 37 { 38 StringImpl* dataImpl = data.impl() ? data.impl() : StringImpl::empty(); 39 if (equal(m_data.get(), dataImpl)) 40 return; 41 42 unsigned oldLength = length(); 43 44 setDataAndUpdate(dataImpl, 0, oldLength, dataImpl->length()); 45 document()->textRemoved(this, 0, oldLength); 46 } 47 48 String CharacterData::substringData(unsigned offset, unsigned count, ExceptionCode& ec) 49 { 50 checkCharDataOperation(offset, ec); 51 if (ec) 52 return String(); 53 54 return m_data->substring(offset, count); 55 } 56 57 unsigned CharacterData::parserAppendData(const UChar* data, unsigned dataLength, unsigned lengthLimit) 58 { 59 unsigned oldLength = m_data->length(); 60 61 unsigned end = min(dataLength, lengthLimit - oldLength); 62 63 // Check that we are not on an unbreakable boundary. 64 // Some text break iterator implementations work best if the passed buffer is as small as possible, 65 // see <https://bugs.webkit.org/show_bug.cgi?id=29092>. 66 // We need at least two characters look-ahead to account for UTF-16 surrogates. 67 if (end < dataLength) { 68 TextBreakIterator* it = characterBreakIterator(data, (end + 2 > dataLength) ? dataLength : end + 2); 69 if (!isTextBreak(it, end)) 70 end = textBreakPreceding(it, end); 71 } 72 73 if (!end) 74 return 0; 75 76 String newStr = m_data; 77 newStr.append(data, end); 78 m_data = newStr.impl(); 79 80 updateRenderer(oldLength, 0); 81 // We don't call dispatchModifiedEvent here because we don't want the 82 // parser to dispatch DOM mutation events. 83 if (parentNode()) 84 parentNode()->childrenChanged(); 85 86 return end; 87 } 88 89 void CharacterData::appendData(const String& data, ExceptionCode&) 90 { 91 String newStr = m_data; 92 newStr.append(data); 93 94 setDataAndUpdate(newStr.impl(), m_data->length(), 0, data.length()); 95 96 // FIXME: Should we call textInserted here? 97 } 98 99 void CharacterData::insertData(unsigned offset, const String& data, ExceptionCode& ec) 100 { 101 checkCharDataOperation(offset, ec); 102 if (ec) 103 return; 104 105 String newStr = m_data; 106 newStr.insert(data, offset); 107 108 setDataAndUpdate(newStr.impl(), offset, 0, data.length()); 109 110 document()->textInserted(this, offset, data.length()); 111 } 112 113 void CharacterData::deleteData(unsigned offset, unsigned count, ExceptionCode& ec) 114 { 115 checkCharDataOperation(offset, ec); 116 if (ec) 117 return; 118 119 unsigned realCount; 120 if (offset + count > length()) 121 realCount = length() - offset; 122 else 123 realCount = count; 124 125 String newStr = m_data; 126 newStr.remove(offset, realCount); 127 128 setDataAndUpdate(newStr.impl(), offset, count, 0); 129 130 document()->textRemoved(this, offset, realCount); 131 } 132 133 void CharacterData::replaceData(unsigned offset, unsigned count, const String& data, ExceptionCode& ec) 134 { 135 checkCharDataOperation(offset, ec); 136 if (ec) 137 return; 138 139 unsigned realCount; 140 if (offset + count > length()) 141 realCount = length() - offset; 142 else 143 realCount = count; 144 145 String newStr = m_data; 146 newStr.remove(offset, realCount); 147 newStr.insert(data, offset); 148 149 setDataAndUpdate(newStr.impl(), offset, count, data.length()); 150 151 // update the markers for spell checking and grammar checking 152 document()->textRemoved(this, offset, realCount); 153 document()->textInserted(this, offset, data.length()); 154 } 155 156 String CharacterData::nodeValue() const 157 { 158 return m_data; 159 } 160 161 bool CharacterData::containsOnlyWhitespace() const 162 { 163 return !m_data || m_data->containsOnlyWhitespace(); 164 } 165 166 void CharacterData::setNodeValue(const String& nodeValue, ExceptionCode& ec) 167 { 168 setData(nodeValue, ec); 169 } 170 171 void CharacterData::setDataAndUpdate(PassRefPtr<StringImpl> newData, unsigned offsetOfReplacedData, unsigned oldLength, unsigned newLength) 172 { 173 if (document()->frame()) 174 document()->frame()->selection()->textWillBeReplaced(this, offsetOfReplacedData, oldLength, newLength); 175 RefPtr<StringImpl> oldData = m_data; 176 m_data = newData; 177 updateRenderer(offsetOfReplacedData, oldLength); 178 dispatchModifiedEvent(oldData.get()); 179 } 180 181 void CharacterData::updateRenderer(unsigned offsetOfReplacedData, unsigned lengthOfReplacedData) 182 { 183 if ((!renderer() || !rendererIsNeeded(renderer()->style())) && attached()) { 184 detach(); 185 attach(); 186 } else if (renderer()) 187 toRenderText(renderer())->setTextWithOffset(m_data, offsetOfReplacedData, lengthOfReplacedData); 188 } 189 190 void CharacterData::dispatchModifiedEvent(StringImpl* oldData) 191 { 192 if (parentNode()) 193 parentNode()->childrenChanged(); 194 if (document()->hasListenerType(Document::DOMCHARACTERDATAMODIFIED_LISTENER)) 195 dispatchEvent(MutationEvent::create(eventNames().DOMCharacterDataModifiedEvent, true, 0, oldData, m_data)); 196 dispatchSubtreeModifiedEvent(); 197 #if ENABLE(INSPECTOR) 198 InspectorInstrumentation::characterDataModified(document(), this); 199 #endif 200 } 201 202 void CharacterData::checkCharDataOperation(unsigned offset, ExceptionCode& ec) 203 { 204 ec = 0; 205 206 // INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than the number of 16-bit 207 // units in data. 208 if (offset > length()) { 209 ec = INDEX_SIZE_ERR; 210 return; 211 } 212 } 213 214 int CharacterData::maxCharacterOffset() const 215 { 216 return static_cast<int>(length()); 217 } 218 219 bool CharacterData::rendererIsNeeded(RenderStyle *style) 220 { 221 if (!m_data || !length()) 222 return false; 223 return Node::rendererIsNeeded(style); 224 } 225 226 bool CharacterData::offsetInCharacters() const 227 { 228 return true; 229 } 230 231 } // namespace WebCore 232