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 "BreakBlockquoteCommand.h" 28 29 #include "HTMLElement.h" 30 #include "HTMLNames.h" 31 #include "RenderListItem.h" 32 #include "Text.h" 33 #include "VisiblePosition.h" 34 #include "htmlediting.h" 35 36 namespace WebCore { 37 38 using namespace HTMLNames; 39 40 BreakBlockquoteCommand::BreakBlockquoteCommand(Document *document) 41 : CompositeEditCommand(document) 42 { 43 } 44 45 void BreakBlockquoteCommand::doApply() 46 { 47 if (endingSelection().isNone()) 48 return; 49 50 // Delete the current selection. 51 if (endingSelection().isRange()) 52 deleteSelection(false, false); 53 54 // This is a scenario that should never happen, but we want to 55 // make sure we don't dereference a null pointer below. 56 57 ASSERT(!endingSelection().isNone()); 58 59 if (endingSelection().isNone()) 60 return; 61 62 VisiblePosition visiblePos = endingSelection().visibleStart(); 63 64 // pos is a position equivalent to the caret. We use downstream() so that pos will 65 // be in the first node that we need to move (there are a few exceptions to this, see below). 66 Position pos = endingSelection().start().downstream(); 67 68 // Find the top-most blockquote from the start. 69 Node* topBlockquote = highestEnclosingNodeOfType(pos, isMailBlockquote); 70 if (!topBlockquote || !topBlockquote->parentNode() || !topBlockquote->isElementNode()) 71 return; 72 73 RefPtr<Element> breakNode = createBreakElement(document()); 74 75 bool isLastVisPosInNode = isLastVisiblePositionInNode(visiblePos, topBlockquote); 76 77 // If the position is at the beginning of the top quoted content, we don't need to break the quote. 78 // Instead, insert the break before the blockquote, unless the position is as the end of the the quoted content. 79 if (isFirstVisiblePositionInNode(visiblePos, topBlockquote) && !isLastVisPosInNode) { 80 insertNodeBefore(breakNode.get(), topBlockquote); 81 setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM)); 82 rebalanceWhitespace(); 83 return; 84 } 85 86 // Insert a break after the top blockquote. 87 insertNodeAfter(breakNode.get(), topBlockquote); 88 89 // If we're inserting the break at the end of the quoted content, we don't need to break the quote. 90 if (isLastVisPosInNode) { 91 setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM)); 92 rebalanceWhitespace(); 93 return; 94 } 95 96 // Don't move a line break just after the caret. Doing so would create an extra, empty paragraph 97 // in the new blockquote. 98 if (lineBreakExistsAtVisiblePosition(visiblePos)) 99 pos = pos.next(); 100 101 // Adjust the position so we don't split at the beginning of a quote. 102 while (isFirstVisiblePositionInNode(VisiblePosition(pos), enclosingNodeOfType(pos, isMailBlockquote))) 103 pos = pos.previous(); 104 105 // startNode is the first node that we need to move to the new blockquote. 106 Node* startNode = pos.deprecatedNode(); 107 108 // Split at pos if in the middle of a text node. 109 if (startNode->isTextNode()) { 110 Text* textNode = static_cast<Text*>(startNode); 111 if ((unsigned)pos.deprecatedEditingOffset() >= textNode->length()) { 112 startNode = startNode->traverseNextNode(); 113 ASSERT(startNode); 114 } else if (pos.deprecatedEditingOffset() > 0) 115 splitTextNode(textNode, pos.deprecatedEditingOffset()); 116 } else if (pos.deprecatedEditingOffset() > 0) { 117 Node* childAtOffset = startNode->childNode(pos.deprecatedEditingOffset()); 118 startNode = childAtOffset ? childAtOffset : startNode->traverseNextNode(); 119 ASSERT(startNode); 120 } 121 122 // If there's nothing inside topBlockquote to move, we're finished. 123 if (!startNode->isDescendantOf(topBlockquote)) { 124 setEndingSelection(VisibleSelection(VisiblePosition(firstPositionInOrBeforeNode(startNode)))); 125 return; 126 } 127 128 // Build up list of ancestors in between the start node and the top blockquote. 129 Vector<Element*> ancestors; 130 for (Element* node = startNode->parentElement(); node && node != topBlockquote; node = node->parentElement()) 131 ancestors.append(node); 132 133 // Insert a clone of the top blockquote after the break. 134 RefPtr<Element> clonedBlockquote = static_cast<Element*>(topBlockquote)->cloneElementWithoutChildren(); 135 insertNodeAfter(clonedBlockquote.get(), breakNode.get()); 136 137 // Clone startNode's ancestors into the cloned blockquote. 138 // On exiting this loop, clonedAncestor is the lowest ancestor 139 // that was cloned (i.e. the clone of either ancestors.last() 140 // or clonedBlockquote if ancestors is empty). 141 RefPtr<Element> clonedAncestor = clonedBlockquote; 142 for (size_t i = ancestors.size(); i != 0; --i) { 143 RefPtr<Element> clonedChild = ancestors[i - 1]->cloneElementWithoutChildren(); 144 // Preserve list item numbering in cloned lists. 145 if (clonedChild->isElementNode() && clonedChild->hasTagName(olTag)) { 146 Node* listChildNode = i > 1 ? ancestors[i - 2] : startNode; 147 // The first child of the cloned list might not be a list item element, 148 // find the first one so that we know where to start numbering. 149 while (listChildNode && !listChildNode->hasTagName(liTag)) 150 listChildNode = listChildNode->nextSibling(); 151 if (listChildNode && listChildNode->renderer() && listChildNode->renderer()->isListItem()) 152 setNodeAttribute(static_cast<Element*>(clonedChild.get()), startAttr, String::number(toRenderListItem(listChildNode->renderer())->value())); 153 } 154 155 appendNode(clonedChild.get(), clonedAncestor.get()); 156 clonedAncestor = clonedChild; 157 } 158 159 // Move the startNode and its siblings. 160 Node *moveNode = startNode; 161 while (moveNode) { 162 Node *next = moveNode->nextSibling(); 163 removeNode(moveNode); 164 appendNode(moveNode, clonedAncestor.get()); 165 moveNode = next; 166 } 167 168 if (!ancestors.isEmpty()) { 169 // Split the tree up the ancestor chain until the topBlockquote 170 // Throughout this loop, clonedParent is the clone of ancestor's parent. 171 // This is so we can clone ancestor's siblings and place the clones 172 // into the clone corresponding to the ancestor's parent. 173 Element* ancestor; 174 Element* clonedParent; 175 for (ancestor = ancestors.first(), clonedParent = clonedAncestor->parentElement(); 176 ancestor && ancestor != topBlockquote; 177 ancestor = ancestor->parentElement(), clonedParent = clonedParent->parentElement()) { 178 moveNode = ancestor->nextSibling(); 179 while (moveNode) { 180 Node *next = moveNode->nextSibling(); 181 removeNode(moveNode); 182 appendNode(moveNode, clonedParent); 183 moveNode = next; 184 } 185 } 186 187 // If the startNode's original parent is now empty, remove it 188 Node* originalParent = ancestors.first(); 189 if (!originalParent->hasChildNodes()) 190 removeNode(originalParent); 191 } 192 193 // Make sure the cloned block quote renders. 194 addBlockPlaceholderIfNeeded(clonedBlockquote.get()); 195 196 // Put the selection right before the break. 197 setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM)); 198 rebalanceWhitespace(); 199 } 200 201 } // namespace WebCore 202