1/*
2 * Copyright (C) 2006 Apple 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 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 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 "FormatBlockCommand.h"
28
29#include "Document.h"
30#include "Editing.h"
31#include "Element.h"
32#include "HTMLElement.h"
33#include "HTMLNames.h"
34#include "Range.h"
35#include "VisibleUnits.h"
36#include <wtf/NeverDestroyed.h>
37
38namespace WebCore {
39
40using namespace HTMLNames;
41
42static Node* enclosingBlockToSplitTreeTo(Node* startNode);
43static bool isElementForFormatBlock(const QualifiedName& tagName);
44
45static inline bool isElementForFormatBlock(Node* node)
46{
47 return is<Element>(*node) && isElementForFormatBlock(downcast<Element>(*node).tagQName());
48}
49
50FormatBlockCommand::FormatBlockCommand(Document& document, const QualifiedName& tagName)
51 : ApplyBlockElementCommand(document, tagName)
52 , m_didApply(false)
53{
54}
55
56void FormatBlockCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
57{
58 if (!isElementForFormatBlock(tagName()))
59 return;
60 ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
61 m_didApply = true;
62}
63
64void FormatBlockCommand::formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtr<Element>& blockNode)
65{
66 Node* nodeToSplitTo = enclosingBlockToSplitTreeTo(start.deprecatedNode());
67 ASSERT(nodeToSplitTo);
68 RefPtr<Node> outerBlock = (start.deprecatedNode() == nodeToSplitTo) ? start.deprecatedNode() : splitTreeToNode(*start.deprecatedNode(), *nodeToSplitTo);
69 RefPtr<Node> nodeAfterInsertionPosition = outerBlock;
70
71 auto range = Range::create(document(), start, endOfSelection);
72 Element* refNode = enclosingBlockFlowElement(end);
73 Element* root = editableRootForPosition(start);
74 // Root is null for elements with contenteditable=false.
75 if (!root || !refNode)
76 return;
77 if (isElementForFormatBlock(refNode->tagQName()) && start == startOfBlock(start)
78 && (end == endOfBlock(end) || isNodeVisiblyContainedWithin(*refNode, range.get()))
79 && refNode != root && !root->isDescendantOf(*refNode)) {
80 // Already in a block element that only contains the current paragraph
81 if (refNode->hasTagName(tagName()))
82 return;
83 nodeAfterInsertionPosition = refNode;
84 }
85
86 if (!blockNode) {
87 // Create a new blockquote and insert it as a child of the root editable element. We accomplish
88 // this by splitting all parents of the current paragraph up to that point.
89 blockNode = createBlockElement();
90 insertNodeBefore(*blockNode, *nodeAfterInsertionPosition);
91 }
92
93 Position lastParagraphInBlockNode = blockNode->lastChild() ? positionAfterNode(blockNode->lastChild()) : Position();
94 bool wasEndOfParagraph = isEndOfParagraph(lastParagraphInBlockNode);
95
96 moveParagraphWithClones(start, end, blockNode.get(), outerBlock.get());
97
98 if (wasEndOfParagraph && !isEndOfParagraph(lastParagraphInBlockNode) && !isStartOfParagraph(lastParagraphInBlockNode))
99 insertBlockPlaceholder(lastParagraphInBlockNode);
100}
101
102Element* FormatBlockCommand::elementForFormatBlockCommand(Range* range)
103{
104 if (!range)
105 return nullptr;
106
107 Node* commonAncestor = range->commonAncestorContainer();
108 while (commonAncestor && !isElementForFormatBlock(commonAncestor))
109 commonAncestor = commonAncestor->parentNode();
110
111 if (!commonAncestor)
112 return nullptr;
113
114 Element* rootEditableElement = range->startContainer().rootEditableElement();
115 if (!rootEditableElement || commonAncestor->contains(rootEditableElement))
116 return nullptr;
117
118 return commonAncestor->isElementNode() ? downcast<Element>(commonAncestor) : nullptr;
119}
120
121bool isElementForFormatBlock(const QualifiedName& tagName)
122{
123 static const auto blockTags = makeNeverDestroyed(HashSet<QualifiedName> {
124 addressTag,
125 articleTag,
126 asideTag,
127 blockquoteTag,
128 ddTag,
129 divTag,
130 dlTag,
131 dtTag,
132 footerTag,
133 h1Tag,
134 h2Tag,
135 h3Tag,
136 h4Tag,
137 h5Tag,
138 h6Tag,
139 headerTag,
140 hgroupTag,
141 mainTag,
142 navTag,
143 pTag,
144 preTag,
145 sectionTag,
146 });
147 return blockTags.get().contains(tagName);
148}
149
150Node* enclosingBlockToSplitTreeTo(Node* startNode)
151{
152 Node* lastBlock = startNode;
153 for (Node* n = startNode; n; n = n->parentNode()) {
154 if (!n->hasEditableStyle())
155 return lastBlock;
156 if (isTableCell(n) || n->hasTagName(bodyTag) || !n->parentNode() || !n->parentNode()->hasEditableStyle() || isElementForFormatBlock(n))
157 return n;
158 if (isBlock(n))
159 lastBlock = n;
160 if (isListHTMLElement(n))
161 return n->parentNode()->hasEditableStyle() ? n->parentNode() : n;
162 }
163 return lastBlock;
164}
165
166}
167