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1 /*
2  * Copyright (C) 2006, 2008 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 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 (IndentOutdentCommandINCLUDING, 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 "IndentOutdentCommand.h"
28 
29 #include "Document.h"
30 #include "Element.h"
31 #include "HTMLBlockquoteElement.h"
32 #include "HTMLNames.h"
33 #include "InsertLineBreakCommand.h"
34 #include "InsertListCommand.h"
35 #include "Range.h"
36 #include "SplitElementCommand.h"
37 #include "Text.h"
38 #include "TextIterator.h"
39 #include "htmlediting.h"
40 #include "visible_units.h"
41 #include <wtf/StdLibExtras.h>
42 
43 namespace WebCore {
44 
45 using namespace HTMLNames;
46 
isListOrIndentBlockquote(const Node * node)47 static bool isListOrIndentBlockquote(const Node* node)
48 {
49     return node && (node->hasTagName(ulTag) || node->hasTagName(olTag) || node->hasTagName(blockquoteTag));
50 }
51 
IndentOutdentCommand(Document * document,EIndentType typeOfAction,int marginInPixels)52 IndentOutdentCommand::IndentOutdentCommand(Document* document, EIndentType typeOfAction, int marginInPixels)
53     : ApplyBlockElementCommand(document, blockquoteTag, "webkit-indent-blockquote", "margin: 0 0 0 40px; border: none; padding: 0px;")
54     , m_typeOfAction(typeOfAction)
55     , m_marginInPixels(marginInPixels)
56 {
57 }
58 
tryIndentingAsListItem(const Position & start,const Position & end)59 bool IndentOutdentCommand::tryIndentingAsListItem(const Position& start, const Position& end)
60 {
61     // If our selection is not inside a list, bail out.
62     Node* lastNodeInSelectedParagraph = start.deprecatedNode();
63     RefPtr<Element> listNode = enclosingList(lastNodeInSelectedParagraph);
64     if (!listNode)
65         return false;
66 
67     // Find the block that we want to indent.  If it's not a list item (e.g., a div inside a list item), we bail out.
68     Element* selectedListItem = static_cast<Element*>(enclosingBlock(lastNodeInSelectedParagraph));
69 
70     // FIXME: we need to deal with the case where there is no li (malformed HTML)
71     if (!selectedListItem->hasTagName(liTag))
72         return false;
73 
74     // FIXME: previousElementSibling does not ignore non-rendered content like <span></span>.  Should we?
75     Element* previousList = selectedListItem->previousElementSibling();
76     Element* nextList = selectedListItem->nextElementSibling();
77 
78     RefPtr<Element> newList = document()->createElement(listNode->tagQName(), false);
79     insertNodeBefore(newList, selectedListItem);
80 
81     moveParagraphWithClones(start, end, newList.get(), selectedListItem);
82 
83     if (canMergeLists(previousList, newList.get()))
84         mergeIdenticalElements(previousList, newList);
85     if (canMergeLists(newList.get(), nextList))
86         mergeIdenticalElements(newList, nextList);
87 
88     return true;
89 }
90 
indentIntoBlockquote(const Position & start,const Position & end,RefPtr<Element> & targetBlockquote)91 void IndentOutdentCommand::indentIntoBlockquote(const Position& start, const Position& end, RefPtr<Element>& targetBlockquote)
92 {
93     Node* enclosingCell = enclosingNodeOfType(start, &isTableCell);
94     Node* nodeToSplitTo;
95     if (enclosingCell)
96         nodeToSplitTo = enclosingCell;
97     else if (enclosingList(start.deprecatedNode()))
98         nodeToSplitTo = enclosingBlock(start.deprecatedNode());
99     else
100         nodeToSplitTo = editableRootForPosition(start);
101 
102     if (!nodeToSplitTo)
103         return;
104 
105     RefPtr<Node> outerBlock = (start.deprecatedNode() == nodeToSplitTo) ? start.deprecatedNode() : splitTreeToNode(start.deprecatedNode(), nodeToSplitTo);
106 
107     if (!targetBlockquote) {
108         // Create a new blockquote and insert it as a child of the root editable element. We accomplish
109         // this by splitting all parents of the current paragraph up to that point.
110         targetBlockquote = createBlockElement();
111         insertNodeBefore(targetBlockquote, outerBlock);
112     }
113 
114     moveParagraphWithClones(start, end, targetBlockquote.get(), outerBlock.get());
115 }
116 
outdentParagraph()117 void IndentOutdentCommand::outdentParagraph()
118 {
119     VisiblePosition visibleStartOfParagraph = startOfParagraph(endingSelection().visibleStart());
120     VisiblePosition visibleEndOfParagraph = endOfParagraph(visibleStartOfParagraph);
121 
122     Node* enclosingNode = enclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), &isListOrIndentBlockquote);
123     if (!enclosingNode || !enclosingNode->parentNode()->rendererIsEditable()) // We can't outdent if there is no place to go!
124         return;
125 
126     // Use InsertListCommand to remove the selection from the list
127     if (enclosingNode->hasTagName(olTag)) {
128         applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::OrderedList));
129         return;
130     }
131     if (enclosingNode->hasTagName(ulTag)) {
132         applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::UnorderedList));
133         return;
134     }
135 
136     // The selection is inside a blockquote i.e. enclosingNode is a blockquote
137     VisiblePosition positionInEnclosingBlock = VisiblePosition(firstPositionInNode(enclosingNode));
138     // If the blockquote is inline, the start of the enclosing block coincides with
139     // positionInEnclosingBlock.
140     VisiblePosition startOfEnclosingBlock = (enclosingNode->renderer() && enclosingNode->renderer()->isInline()) ? positionInEnclosingBlock : startOfBlock(positionInEnclosingBlock);
141     VisiblePosition lastPositionInEnclosingBlock = VisiblePosition(lastPositionInNode(enclosingNode));
142     VisiblePosition endOfEnclosingBlock = endOfBlock(lastPositionInEnclosingBlock);
143     if (visibleStartOfParagraph == startOfEnclosingBlock &&
144         visibleEndOfParagraph == endOfEnclosingBlock) {
145         // The blockquote doesn't contain anything outside the paragraph, so it can be totally removed.
146         Node* splitPoint = enclosingNode->nextSibling();
147         removeNodePreservingChildren(enclosingNode);
148         // outdentRegion() assumes it is operating on the first paragraph of an enclosing blockquote, but if there are multiply nested blockquotes and we've
149         // just removed one, then this assumption isn't true. By splitting the next containing blockquote after this node, we keep this assumption true
150         if (splitPoint) {
151             if (ContainerNode* splitPointParent = splitPoint->parentNode()) {
152                 if (splitPointParent->hasTagName(blockquoteTag)
153                     && !splitPoint->hasTagName(blockquoteTag)
154                     && splitPointParent->parentNode()->rendererIsEditable()) // We can't outdent if there is no place to go!
155                     splitElement(static_cast<Element*>(splitPointParent), splitPoint);
156             }
157         }
158 
159         updateLayout();
160         visibleStartOfParagraph = VisiblePosition(visibleStartOfParagraph.deepEquivalent());
161         visibleEndOfParagraph = VisiblePosition(visibleEndOfParagraph.deepEquivalent());
162         if (visibleStartOfParagraph.isNotNull() && !isStartOfParagraph(visibleStartOfParagraph))
163             insertNodeAt(createBreakElement(document()), visibleStartOfParagraph.deepEquivalent());
164         if (visibleEndOfParagraph.isNotNull() && !isEndOfParagraph(visibleEndOfParagraph))
165             insertNodeAt(createBreakElement(document()), visibleEndOfParagraph.deepEquivalent());
166 
167         return;
168     }
169     Node* enclosingBlockFlow = enclosingBlock(visibleStartOfParagraph.deepEquivalent().deprecatedNode());
170     RefPtr<Node> splitBlockquoteNode = enclosingNode;
171     if (enclosingBlockFlow != enclosingNode)
172         splitBlockquoteNode = splitTreeToNode(enclosingBlockFlow, enclosingNode, true);
173     else {
174         // We split the blockquote at where we start outdenting.
175         splitElement(static_cast<Element*>(enclosingNode), visibleStartOfParagraph.deepEquivalent().deprecatedNode());
176     }
177     RefPtr<Node> placeholder = createBreakElement(document());
178     insertNodeBefore(placeholder, splitBlockquoteNode);
179     moveParagraph(startOfParagraph(visibleStartOfParagraph), endOfParagraph(visibleEndOfParagraph), positionBeforeNode(placeholder.get()), true);
180 }
181 
182 // FIXME: We should merge this function with ApplyBlockElementCommand::formatSelection
outdentRegion(const VisiblePosition & startOfSelection,const VisiblePosition & endOfSelection)183 void IndentOutdentCommand::outdentRegion(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
184 {
185     VisiblePosition endOfLastParagraph = endOfParagraph(endOfSelection);
186 
187     if (endOfParagraph(startOfSelection) == endOfLastParagraph) {
188         outdentParagraph();
189         return;
190     }
191 
192     Position originalSelectionEnd = endingSelection().end();
193     VisiblePosition endOfCurrentParagraph = endOfParagraph(startOfSelection);
194     VisiblePosition endAfterSelection = endOfParagraph(endOfParagraph(endOfSelection).next());
195 
196     while (endOfCurrentParagraph != endAfterSelection) {
197         VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
198         if (endOfCurrentParagraph == endOfLastParagraph)
199             setEndingSelection(VisibleSelection(originalSelectionEnd, DOWNSTREAM));
200         else
201             setEndingSelection(endOfCurrentParagraph);
202 
203         outdentParagraph();
204 
205         // outdentParagraph could move more than one paragraph if the paragraph
206         // is in a list item. As a result, endAfterSelection and endOfNextParagraph
207         // could refer to positions no longer in the document.
208         if (endAfterSelection.isNotNull() && !endAfterSelection.deepEquivalent().anchorNode()->inDocument())
209             break;
210 
211         if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().anchorNode()->inDocument()) {
212             endOfCurrentParagraph = endingSelection().end();
213             endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
214         }
215         endOfCurrentParagraph = endOfNextParagraph;
216     }
217 }
218 
formatSelection(const VisiblePosition & startOfSelection,const VisiblePosition & endOfSelection)219 void IndentOutdentCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
220 {
221     if (m_typeOfAction == Indent)
222         ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
223     else
224         outdentRegion(startOfSelection, endOfSelection);
225 }
226 
formatRange(const Position & start,const Position & end,const Position &,RefPtr<Element> & blockquoteForNextIndent)227 void IndentOutdentCommand::formatRange(const Position& start, const Position& end, const Position&, RefPtr<Element>& blockquoteForNextIndent)
228 {
229     if (tryIndentingAsListItem(start, end))
230         blockquoteForNextIndent = 0;
231     else
232         indentIntoBlockquote(start, end, blockquoteForNextIndent);
233 }
234 
235 }
236