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 "InsertTextCommand.h"
28
29 #include "Document.h"
30 #include "Element.h"
31 #include "EditingText.h"
32 #include "Editor.h"
33 #include "Frame.h"
34 #include "HTMLInterchange.h"
35 #include "htmlediting.h"
36 #include "visible_units.h"
37 #include <wtf/unicode/CharacterNames.h>
38
39 namespace WebCore {
40
InsertTextCommand(Document * document)41 InsertTextCommand::InsertTextCommand(Document *document)
42 : CompositeEditCommand(document)
43 {
44 }
45
doApply()46 void InsertTextCommand::doApply()
47 {
48 }
49
positionInsideTextNode(const Position & p)50 Position InsertTextCommand::positionInsideTextNode(const Position& p)
51 {
52 Position pos = p;
53 if (isTabSpanTextNode(pos.anchorNode())) {
54 RefPtr<Node> textNode = document()->createEditingTextNode("");
55 insertNodeAtTabSpanPosition(textNode.get(), pos);
56 return firstPositionInNode(textNode.get());
57 }
58
59 // Prepare for text input by looking at the specified position.
60 // It may be necessary to insert a text node to receive characters.
61 if (!pos.containerNode()->isTextNode()) {
62 RefPtr<Node> textNode = document()->createEditingTextNode("");
63 insertNodeAt(textNode.get(), pos);
64 return firstPositionInNode(textNode.get());
65 }
66
67 return pos;
68 }
69
70 // This avoids the expense of a full fledged delete operation, and avoids a layout that typically results
71 // from text removal.
performTrivialReplace(const String & text,bool selectInsertedText)72 bool InsertTextCommand::performTrivialReplace(const String& text, bool selectInsertedText)
73 {
74 if (!endingSelection().isRange())
75 return false;
76
77 if (text.contains('\t') || text.contains(' ') || text.contains('\n'))
78 return false;
79
80 Position start = endingSelection().start().parentAnchoredEquivalent();
81 Position end = endingSelection().end().parentAnchoredEquivalent();
82 ASSERT(start.anchorType() == Position::PositionIsOffsetInAnchor);
83 ASSERT(end.anchorType() == Position::PositionIsOffsetInAnchor);
84
85 if (start.containerNode() != end.containerNode() || !start.containerNode()->isTextNode() || isTabSpanTextNode(start.containerNode()))
86 return false;
87
88 replaceTextInNode(static_cast<Text*>(start.containerNode()), start.offsetInContainerNode(), end.offsetInContainerNode() - start.offsetInContainerNode(), text);
89
90 Position endPosition(start.containerNode(), start.offsetInContainerNode() + text.length());
91
92 // We could have inserted a part of composed character sequence,
93 // so we are basically treating ending selection as a range to avoid validation.
94 // <http://bugs.webkit.org/show_bug.cgi?id=15781>
95 VisibleSelection forcedEndingSelection;
96 forcedEndingSelection.setWithoutValidation(start, endPosition);
97 setEndingSelection(forcedEndingSelection);
98
99 if (!selectInsertedText)
100 setEndingSelection(VisibleSelection(endingSelection().visibleEnd()));
101
102 return true;
103 }
104
input(const String & text,bool selectInsertedText,RebalanceType whitespaceRebalance)105 void InsertTextCommand::input(const String& text, bool selectInsertedText, RebalanceType whitespaceRebalance)
106 {
107
108 ASSERT(text.find('\n') == notFound);
109
110 if (!endingSelection().isNonOrphanedCaretOrRange())
111 return;
112
113 // Delete the current selection.
114 // FIXME: This delete operation blows away the typing style.
115 if (endingSelection().isRange()) {
116 if (performTrivialReplace(text, selectInsertedText))
117 return;
118 deleteSelection(false, true, true, false);
119 }
120
121 Position startPosition(endingSelection().start());
122
123 Position placeholder;
124 // We want to remove preserved newlines and brs that will collapse (and thus become unnecessary) when content
125 // is inserted just before them.
126 // FIXME: We shouldn't really have to do this, but removing placeholders is a workaround for 9661.
127 // If the caret is just before a placeholder, downstream will normalize the caret to it.
128 Position downstream(startPosition.downstream());
129 if (lineBreakExistsAtPosition(downstream)) {
130 // FIXME: This doesn't handle placeholders at the end of anonymous blocks.
131 VisiblePosition caret(startPosition);
132 if (isEndOfBlock(caret) && isStartOfParagraph(caret))
133 placeholder = downstream;
134 // Don't remove the placeholder yet, otherwise the block we're inserting into would collapse before
135 // we get a chance to insert into it. We check for a placeholder now, though, because doing so requires
136 // the creation of a VisiblePosition, and if we did that post-insertion it would force a layout.
137 }
138
139 // Insert the character at the leftmost candidate.
140 startPosition = startPosition.upstream();
141
142 // It is possible for the node that contains startPosition to contain only unrendered whitespace,
143 // and so deleteInsignificantText could remove it. Save the position before the node in case that happens.
144 Position positionBeforeStartNode(positionInParentBeforeNode(startPosition.containerNode()));
145 deleteInsignificantText(startPosition.upstream(), startPosition.downstream());
146 if (!startPosition.anchorNode()->inDocument())
147 startPosition = positionBeforeStartNode;
148 if (!startPosition.isCandidate())
149 startPosition = startPosition.downstream();
150
151 startPosition = positionAvoidingSpecialElementBoundary(startPosition);
152
153 Position endPosition;
154
155 if (text == "\t") {
156 endPosition = insertTab(startPosition);
157 startPosition = endPosition.previous();
158 if (placeholder.isNotNull())
159 removePlaceholderAt(placeholder);
160 } else {
161 // Make sure the document is set up to receive text
162 startPosition = positionInsideTextNode(startPosition);
163 ASSERT(startPosition.anchorType() == Position::PositionIsOffsetInAnchor);
164 ASSERT(startPosition.containerNode());
165 ASSERT(startPosition.containerNode()->isTextNode());
166 if (placeholder.isNotNull())
167 removePlaceholderAt(placeholder);
168 Text* textNode = static_cast<Text*>(startPosition.containerNode());
169 const unsigned offset = startPosition.offsetInContainerNode();
170
171 insertTextIntoNode(textNode, offset, text);
172 endPosition = Position(textNode, offset + text.length(), Position::PositionIsOffsetInAnchor);
173
174 if (whitespaceRebalance == RebalanceLeadingAndTrailingWhitespaces) {
175 // The insertion may require adjusting adjacent whitespace, if it is present.
176 rebalanceWhitespaceAt(endPosition);
177 // Rebalancing on both sides isn't necessary if we've inserted only spaces.
178 if (!shouldRebalanceLeadingWhitespaceFor(text))
179 rebalanceWhitespaceAt(startPosition);
180 } else {
181 ASSERT(whitespaceRebalance == RebalanceAllWhitespaces);
182 if (canRebalance(startPosition) && canRebalance(endPosition))
183 rebalanceWhitespaceOnTextSubstring(textNode, startPosition.offsetInContainerNode(), endPosition.offsetInContainerNode());
184 }
185 }
186
187 // We could have inserted a part of composed character sequence,
188 // so we are basically treating ending selection as a range to avoid validation.
189 // <http://bugs.webkit.org/show_bug.cgi?id=15781>
190 VisibleSelection forcedEndingSelection;
191 forcedEndingSelection.setWithoutValidation(startPosition, endPosition);
192 setEndingSelection(forcedEndingSelection);
193
194 // Handle the case where there is a typing style.
195 if (RefPtr<EditingStyle> typingStyle = document()->frame()->selection()->typingStyle()) {
196 typingStyle->prepareToApplyAt(endPosition, EditingStyle::PreserveWritingDirection);
197 if (!typingStyle->isEmpty())
198 applyStyle(typingStyle.get());
199 }
200
201 if (!selectInsertedText)
202 setEndingSelection(VisibleSelection(endingSelection().end(), endingSelection().affinity()));
203 }
204
insertTab(const Position & pos)205 Position InsertTextCommand::insertTab(const Position& pos)
206 {
207 Position insertPos = VisiblePosition(pos, DOWNSTREAM).deepEquivalent();
208
209 Node* node = insertPos.deprecatedNode();
210 unsigned int offset = insertPos.deprecatedEditingOffset();
211
212 // keep tabs coalesced in tab span
213 if (isTabSpanTextNode(node)) {
214 insertTextIntoNode(static_cast<Text *>(node), offset, "\t");
215 return Position(node, offset + 1, Position::PositionIsOffsetInAnchor);
216 }
217
218 // create new tab span
219 RefPtr<Element> spanNode = createTabSpanElement(document());
220
221 // place it
222 if (!node->isTextNode()) {
223 insertNodeAt(spanNode.get(), insertPos);
224 } else {
225 Text *textNode = static_cast<Text *>(node);
226 if (offset >= textNode->length()) {
227 insertNodeAfter(spanNode.get(), textNode);
228 } else {
229 // split node to make room for the span
230 // NOTE: splitTextNode uses textNode for the
231 // second node in the split, so we need to
232 // insert the span before it.
233 if (offset > 0)
234 splitTextNode(textNode, offset);
235 insertNodeBefore(spanNode, textNode);
236 }
237 }
238
239 // return the position following the new tab
240 return lastPositionInNode(spanNode.get());
241 }
242
isInsertTextCommand() const243 bool InsertTextCommand::isInsertTextCommand() const
244 {
245 return true;
246 }
247
248 }
249