1 /*
2 * Copyright (C) 2005 Apple Computer, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "core/editing/BreakBlockquoteCommand.h"
28
29 #include "core/HTMLNames.h"
30 #include "core/dom/NodeTraversal.h"
31 #include "core/dom/Text.h"
32 #include "core/editing/VisiblePosition.h"
33 #include "core/editing/htmlediting.h"
34 #include "core/html/HTMLElement.h"
35 #include "core/rendering/RenderListItem.h"
36
37 namespace WebCore {
38
39 using namespace HTMLNames;
40
BreakBlockquoteCommand(Document & document)41 BreakBlockquoteCommand::BreakBlockquoteCommand(Document& document)
42 : CompositeEditCommand(document)
43 {
44 }
45
doApply()46 void BreakBlockquoteCommand::doApply()
47 {
48 if (endingSelection().isNone())
49 return;
50
51 // Delete the current selection.
52 if (endingSelection().isRange())
53 deleteSelection(false, false);
54
55 // This is a scenario that should never happen, but we want to
56 // make sure we don't dereference a null pointer below.
57
58 ASSERT(!endingSelection().isNone());
59
60 if (endingSelection().isNone())
61 return;
62
63 VisiblePosition visiblePos = endingSelection().visibleStart();
64
65 // pos is a position equivalent to the caret. We use downstream() so that pos will
66 // be in the first node that we need to move (there are a few exceptions to this, see below).
67 Position pos = endingSelection().start().downstream();
68
69 // Find the top-most blockquote from the start.
70 Node* topBlockquote = highestEnclosingNodeOfType(pos, isMailBlockquote);
71 if (!topBlockquote || !topBlockquote->parentNode() || !topBlockquote->isElementNode())
72 return;
73
74 RefPtrWillBeRawPtr<Element> breakNode = createBreakElement(document());
75
76 bool isLastVisPosInNode = isLastVisiblePositionInNode(visiblePos, topBlockquote);
77
78 // If the position is at the beginning of the top quoted content, we don't need to break the quote.
79 // Instead, insert the break before the blockquote, unless the position is as the end of the the quoted content.
80 if (isFirstVisiblePositionInNode(visiblePos, topBlockquote) && !isLastVisPosInNode) {
81 insertNodeBefore(breakNode.get(), topBlockquote);
82 setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM, endingSelection().isDirectional()));
83 rebalanceWhitespace();
84 return;
85 }
86
87 // Insert a break after the top blockquote.
88 insertNodeAfter(breakNode.get(), topBlockquote);
89
90 // If we're inserting the break at the end of the quoted content, we don't need to break the quote.
91 if (isLastVisPosInNode) {
92 setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM, endingSelection().isDirectional()));
93 rebalanceWhitespace();
94 return;
95 }
96
97 // Don't move a line break just after the caret. Doing so would create an extra, empty paragraph
98 // in the new blockquote.
99 if (lineBreakExistsAtVisiblePosition(visiblePos))
100 pos = pos.next();
101
102 // Adjust the position so we don't split at the beginning of a quote.
103 while (isFirstVisiblePositionInNode(VisiblePosition(pos), enclosingNodeOfType(pos, isMailBlockquote)))
104 pos = pos.previous();
105
106 // startNode is the first node that we need to move to the new blockquote.
107 Node* startNode = pos.deprecatedNode();
108 ASSERT(startNode);
109
110 // Split at pos if in the middle of a text node.
111 if (startNode->isTextNode()) {
112 Text* textNode = toText(startNode);
113 if ((unsigned)pos.deprecatedEditingOffset() >= textNode->length()) {
114 startNode = NodeTraversal::next(*startNode);
115 ASSERT(startNode);
116 } else if (pos.deprecatedEditingOffset() > 0)
117 splitTextNode(textNode, pos.deprecatedEditingOffset());
118 } else if (pos.deprecatedEditingOffset() > 0) {
119 Node* childAtOffset = startNode->traverseToChildAt(pos.deprecatedEditingOffset());
120 startNode = childAtOffset ? childAtOffset : NodeTraversal::next(*startNode);
121 ASSERT(startNode);
122 }
123
124 // If there's nothing inside topBlockquote to move, we're finished.
125 if (!startNode->isDescendantOf(topBlockquote)) {
126 setEndingSelection(VisibleSelection(VisiblePosition(firstPositionInOrBeforeNode(startNode)), endingSelection().isDirectional()));
127 return;
128 }
129
130 // Build up list of ancestors in between the start node and the top blockquote.
131 WillBeHeapVector<RefPtrWillBeMember<Element> > ancestors;
132 for (Element* node = startNode->parentElement(); node && node != topBlockquote; node = node->parentElement())
133 ancestors.append(node);
134
135 // Insert a clone of the top blockquote after the break.
136 RefPtrWillBeRawPtr<Element> clonedBlockquote = toElement(topBlockquote)->cloneElementWithoutChildren();
137 insertNodeAfter(clonedBlockquote.get(), breakNode.get());
138
139 // Clone startNode's ancestors into the cloned blockquote.
140 // On exiting this loop, clonedAncestor is the lowest ancestor
141 // that was cloned (i.e. the clone of either ancestors.last()
142 // or clonedBlockquote if ancestors is empty).
143 RefPtrWillBeRawPtr<Element> clonedAncestor = clonedBlockquote;
144 for (size_t i = ancestors.size(); i != 0; --i) {
145 RefPtrWillBeRawPtr<Element> clonedChild = ancestors[i - 1]->cloneElementWithoutChildren();
146 // Preserve list item numbering in cloned lists.
147 if (isHTMLOListElement(*clonedChild)) {
148 Node* listChildNode = i > 1 ? ancestors[i - 2].get() : startNode;
149 // The first child of the cloned list might not be a list item element,
150 // find the first one so that we know where to start numbering.
151 while (listChildNode && !isHTMLLIElement(*listChildNode))
152 listChildNode = listChildNode->nextSibling();
153 if (listChildNode && listChildNode->renderer() && listChildNode->renderer()->isListItem())
154 setNodeAttribute(clonedChild, startAttr, AtomicString::number(toRenderListItem(listChildNode->renderer())->value()));
155 }
156
157 appendNode(clonedChild.get(), clonedAncestor.get());
158 clonedAncestor = clonedChild;
159 }
160
161 moveRemainingSiblingsToNewParent(startNode, 0, clonedAncestor);
162
163 if (!ancestors.isEmpty()) {
164 // Split the tree up the ancestor chain until the topBlockquote
165 // Throughout this loop, clonedParent is the clone of ancestor's parent.
166 // This is so we can clone ancestor's siblings and place the clones
167 // into the clone corresponding to the ancestor's parent.
168 RefPtrWillBeRawPtr<Element> ancestor = nullptr;
169 RefPtrWillBeRawPtr<Element> clonedParent = nullptr;
170 for (ancestor = ancestors.first(), clonedParent = clonedAncestor->parentElement();
171 ancestor && ancestor != topBlockquote;
172 ancestor = ancestor->parentElement(), clonedParent = clonedParent->parentElement())
173 moveRemainingSiblingsToNewParent(ancestor->nextSibling(), 0, clonedParent);
174
175 // If the startNode's original parent is now empty, remove it
176 Node* originalParent = ancestors.first().get();
177 if (!originalParent->hasChildren())
178 removeNode(originalParent);
179 }
180
181 // Make sure the cloned block quote renders.
182 addBlockPlaceholderIfNeeded(clonedBlockquote.get());
183
184 // Put the selection right before the break.
185 setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM, endingSelection().isDirectional()));
186 rebalanceWhitespace();
187 }
188
189 } // namespace WebCore
190