1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 *           (C) 1999 Antti Koivisto (koivisto@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
32using namespace std;
33
34namespace WebCore {
35
36void 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
48String 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
57unsigned 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
89void 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
99void 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
113void 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
133void 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
156String CharacterData::nodeValue() const
157{
158    return m_data;
159}
160
161bool CharacterData::containsOnlyWhitespace() const
162{
163    return !m_data || m_data->containsOnlyWhitespace();
164}
165
166void CharacterData::setNodeValue(const String& nodeValue, ExceptionCode& ec)
167{
168    setData(nodeValue, ec);
169}
170
171void 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
181void 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
190void 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
202void 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
214int CharacterData::maxCharacterOffset() const
215{
216    return static_cast<int>(length());
217}
218
219bool CharacterData::rendererIsNeeded(RenderStyle *style)
220{
221    if (!m_data || !length())
222        return false;
223    return Node::rendererIsNeeded(style);
224}
225
226bool CharacterData::offsetInCharacters() const
227{
228    return true;
229}
230
231} // namespace WebCore
232