| /* |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "visible_units.h" |
| |
| #include "Document.h" |
| #include "Element.h" |
| #include "HTMLNames.h" |
| #include "Position.h" |
| #include "RenderBlock.h" |
| #include "RenderLayer.h" |
| #include "RenderObject.h" |
| #include "TextBoundaries.h" |
| #include "TextBreakIterator.h" |
| #include "TextIterator.h" |
| #include "VisiblePosition.h" |
| #include "VisibleSelection.h" |
| #include "htmlediting.h" |
| #include <wtf/unicode/Unicode.h> |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| using namespace WTF::Unicode; |
| |
| enum BoundarySearchContextAvailability { DontHaveMoreContext, MayHaveMoreContext }; |
| |
| typedef unsigned (*BoundarySearchFunction)(const UChar*, unsigned length, unsigned offset, BoundarySearchContextAvailability, bool& needMoreContext); |
| |
| static VisiblePosition previousBoundary(const VisiblePosition& c, BoundarySearchFunction searchFunction) |
| { |
| Position pos = c.deepEquivalent(); |
| Node* boundary = pos.parentEditingBoundary(); |
| if (!boundary) |
| return VisiblePosition(); |
| |
| Document* d = boundary->document(); |
| Position start = Position(boundary, 0).parentAnchoredEquivalent(); |
| Position end = pos.parentAnchoredEquivalent(); |
| RefPtr<Range> searchRange = Range::create(d); |
| |
| Vector<UChar, 1024> string; |
| unsigned suffixLength = 0; |
| |
| ExceptionCode ec = 0; |
| if (requiresContextForWordBoundary(c.characterBefore())) { |
| RefPtr<Range> forwardsScanRange(d->createRange()); |
| forwardsScanRange->setEndAfter(boundary, ec); |
| forwardsScanRange->setStart(end.deprecatedNode(), end.deprecatedEditingOffset(), ec); |
| TextIterator forwardsIterator(forwardsScanRange.get()); |
| while (!forwardsIterator.atEnd()) { |
| const UChar* characters = forwardsIterator.characters(); |
| int length = forwardsIterator.length(); |
| int i = endOfFirstWordBoundaryContext(characters, length); |
| string.append(characters, i); |
| suffixLength += i; |
| if (i < length) |
| break; |
| forwardsIterator.advance(); |
| } |
| } |
| |
| searchRange->setStart(start.deprecatedNode(), start.deprecatedEditingOffset(), ec); |
| searchRange->setEnd(end.deprecatedNode(), end.deprecatedEditingOffset(), ec); |
| |
| ASSERT(!ec); |
| if (ec) |
| return VisiblePosition(); |
| |
| SimplifiedBackwardsTextIterator it(searchRange.get()); |
| unsigned next = 0; |
| bool inTextSecurityMode = start.deprecatedNode() && start.deprecatedNode()->renderer() && start.deprecatedNode()->renderer()->style()->textSecurity() != TSNONE; |
| bool needMoreContext = false; |
| while (!it.atEnd()) { |
| // iterate to get chunks until the searchFunction returns a non-zero value. |
| if (!inTextSecurityMode) |
| string.prepend(it.characters(), it.length()); |
| else { |
| // Treat bullets used in the text security mode as regular characters when looking for boundaries |
| String iteratorString(it.characters(), it.length()); |
| iteratorString = iteratorString.impl()->secure('x'); |
| string.prepend(iteratorString.characters(), iteratorString.length()); |
| } |
| next = searchFunction(string.data(), string.size(), string.size() - suffixLength, MayHaveMoreContext, needMoreContext); |
| if (next != 0) |
| break; |
| it.advance(); |
| } |
| if (needMoreContext) { |
| // The last search returned the beginning of the buffer and asked for more context, |
| // but there is no earlier text. Force a search with what's available. |
| next = searchFunction(string.data(), string.size(), string.size() - suffixLength, DontHaveMoreContext, needMoreContext); |
| ASSERT(!needMoreContext); |
| } |
| |
| if (!next) |
| return VisiblePosition(it.atEnd() ? it.range()->startPosition() : pos, DOWNSTREAM); |
| |
| Node* node = it.range()->startContainer(ec); |
| if ((node->isTextNode() && static_cast<int>(next) <= node->maxCharacterOffset()) || (node->renderer() && node->renderer()->isBR() && !next)) |
| // The next variable contains a usable index into a text node |
| return VisiblePosition(Position(node, next), DOWNSTREAM); |
| |
| // Use the character iterator to translate the next value into a DOM position. |
| BackwardsCharacterIterator charIt(searchRange.get()); |
| charIt.advance(string.size() - suffixLength - next); |
| // FIXME: charIt can get out of shadow host. |
| return VisiblePosition(charIt.range()->endPosition(), DOWNSTREAM); |
| } |
| |
| static VisiblePosition nextBoundary(const VisiblePosition& c, BoundarySearchFunction searchFunction) |
| { |
| Position pos = c.deepEquivalent(); |
| Node* boundary = pos.parentEditingBoundary(); |
| if (!boundary) |
| return VisiblePosition(); |
| |
| Document* d = boundary->document(); |
| RefPtr<Range> searchRange(d->createRange()); |
| Position start(pos.parentAnchoredEquivalent()); |
| |
| Vector<UChar, 1024> string; |
| unsigned prefixLength = 0; |
| |
| ExceptionCode ec = 0; |
| if (requiresContextForWordBoundary(c.characterAfter())) { |
| RefPtr<Range> backwardsScanRange(d->createRange()); |
| backwardsScanRange->setEnd(start.deprecatedNode(), start.deprecatedEditingOffset(), ec); |
| SimplifiedBackwardsTextIterator backwardsIterator(backwardsScanRange.get()); |
| while (!backwardsIterator.atEnd()) { |
| const UChar* characters = backwardsIterator.characters(); |
| int length = backwardsIterator.length(); |
| int i = startOfLastWordBoundaryContext(characters, length); |
| string.prepend(characters + i, length - i); |
| prefixLength += length - i; |
| if (i > 0) |
| break; |
| backwardsIterator.advance(); |
| } |
| } |
| |
| searchRange->selectNodeContents(boundary, ec); |
| searchRange->setStart(start.deprecatedNode(), start.deprecatedEditingOffset(), ec); |
| TextIterator it(searchRange.get(), TextIteratorEmitsCharactersBetweenAllVisiblePositions); |
| unsigned next = 0; |
| bool inTextSecurityMode = start.deprecatedNode() && start.deprecatedNode()->renderer() && start.deprecatedNode()->renderer()->style()->textSecurity() != TSNONE; |
| bool needMoreContext = false; |
| while (!it.atEnd()) { |
| // Keep asking the iterator for chunks until the search function |
| // returns an end value not equal to the length of the string passed to it. |
| if (!inTextSecurityMode) |
| string.append(it.characters(), it.length()); |
| else { |
| // Treat bullets used in the text security mode as regular characters when looking for boundaries |
| String iteratorString(it.characters(), it.length()); |
| iteratorString = iteratorString.impl()->secure('x'); |
| string.append(iteratorString.characters(), iteratorString.length()); |
| } |
| next = searchFunction(string.data(), string.size(), prefixLength, MayHaveMoreContext, needMoreContext); |
| if (next != string.size()) |
| break; |
| it.advance(); |
| } |
| if (needMoreContext) { |
| // The last search returned the end of the buffer and asked for more context, |
| // but there is no further text. Force a search with what's available. |
| next = searchFunction(string.data(), string.size(), prefixLength, DontHaveMoreContext, needMoreContext); |
| ASSERT(!needMoreContext); |
| } |
| |
| if (it.atEnd() && next == string.size()) { |
| pos = it.range()->startPosition(); |
| } else if (next != prefixLength) { |
| // Use the character iterator to translate the next value into a DOM position. |
| CharacterIterator charIt(searchRange.get(), TextIteratorEmitsCharactersBetweenAllVisiblePositions); |
| charIt.advance(next - prefixLength - 1); |
| RefPtr<Range> characterRange = charIt.range(); |
| pos = characterRange->endPosition(); |
| |
| if (*charIt.characters() == '\n') { |
| // FIXME: workaround for collapsed range (where only start position is correct) emitted for some emitted newlines (see rdar://5192593) |
| VisiblePosition visPos = VisiblePosition(pos); |
| if (visPos == VisiblePosition(characterRange->startPosition())) { |
| charIt.advance(1); |
| pos = charIt.range()->startPosition(); |
| } |
| } |
| } |
| |
| // generate VisiblePosition, use UPSTREAM affinity if possible |
| return VisiblePosition(pos, VP_UPSTREAM_IF_POSSIBLE); |
| } |
| |
| static bool canHaveCursor(RenderObject* o) |
| { |
| return (o->isText() && toRenderText(o)->linesBoundingBox().height()) |
| || (o->isBox() && toRenderBox(o)->borderBoundingBox().height()); |
| } |
| |
| // --------- |
| |
| static unsigned startWordBoundary(const UChar* characters, unsigned length, unsigned offset, BoundarySearchContextAvailability mayHaveMoreContext, bool& needMoreContext) |
| { |
| ASSERT(offset); |
| if (mayHaveMoreContext && !startOfLastWordBoundaryContext(characters, offset)) { |
| needMoreContext = true; |
| return 0; |
| } |
| needMoreContext = false; |
| int start, end; |
| findWordBoundary(characters, length, offset - 1, &start, &end); |
| return start; |
| } |
| |
| VisiblePosition startOfWord(const VisiblePosition &c, EWordSide side) |
| { |
| // FIXME: This returns a null VP for c at the start of the document |
| // and side == LeftWordIfOnBoundary |
| VisiblePosition p = c; |
| if (side == RightWordIfOnBoundary) { |
| // at paragraph end, the startofWord is the current position |
| if (isEndOfParagraph(c)) |
| return c; |
| |
| p = c.next(); |
| if (p.isNull()) |
| return c; |
| } |
| return previousBoundary(p, startWordBoundary); |
| } |
| |
| static unsigned endWordBoundary(const UChar* characters, unsigned length, unsigned offset, BoundarySearchContextAvailability mayHaveMoreContext, bool& needMoreContext) |
| { |
| ASSERT(offset <= length); |
| if (mayHaveMoreContext && endOfFirstWordBoundaryContext(characters + offset, length - offset) == static_cast<int>(length - offset)) { |
| needMoreContext = true; |
| return length; |
| } |
| needMoreContext = false; |
| int start, end; |
| findWordBoundary(characters, length, offset, &start, &end); |
| return end; |
| } |
| |
| VisiblePosition endOfWord(const VisiblePosition &c, EWordSide side) |
| { |
| VisiblePosition p = c; |
| if (side == LeftWordIfOnBoundary) { |
| if (isStartOfParagraph(c)) |
| return c; |
| |
| p = c.previous(); |
| if (p.isNull()) |
| return c; |
| } else if (isEndOfParagraph(c)) |
| return c; |
| |
| return nextBoundary(p, endWordBoundary); |
| } |
| |
| static unsigned previousWordPositionBoundary(const UChar* characters, unsigned length, unsigned offset, BoundarySearchContextAvailability mayHaveMoreContext, bool& needMoreContext) |
| { |
| if (mayHaveMoreContext && !startOfLastWordBoundaryContext(characters, offset)) { |
| needMoreContext = true; |
| return 0; |
| } |
| needMoreContext = false; |
| return findNextWordFromIndex(characters, length, offset, false); |
| } |
| |
| VisiblePosition previousWordPosition(const VisiblePosition &c) |
| { |
| VisiblePosition prev = previousBoundary(c, previousWordPositionBoundary); |
| return c.honorEditableBoundaryAtOrBefore(prev); |
| } |
| |
| static unsigned nextWordPositionBoundary(const UChar* characters, unsigned length, unsigned offset, BoundarySearchContextAvailability mayHaveMoreContext, bool& needMoreContext) |
| { |
| if (mayHaveMoreContext && endOfFirstWordBoundaryContext(characters + offset, length - offset) == static_cast<int>(length - offset)) { |
| needMoreContext = true; |
| return length; |
| } |
| needMoreContext = false; |
| return findNextWordFromIndex(characters, length, offset, true); |
| } |
| |
| VisiblePosition nextWordPosition(const VisiblePosition &c) |
| { |
| VisiblePosition next = nextBoundary(c, nextWordPositionBoundary); |
| return c.honorEditableBoundaryAtOrAfter(next); |
| } |
| |
| // --------- |
| |
| static RootInlineBox *rootBoxForLine(const VisiblePosition &c) |
| { |
| Position p = c.deepEquivalent(); |
| Node* node = p.deprecatedNode(); |
| if (!node) |
| return 0; |
| |
| RenderObject *renderer = node->renderer(); |
| if (!renderer) |
| return 0; |
| |
| InlineBox* box; |
| int offset; |
| c.getInlineBoxAndOffset(box, offset); |
| |
| return box ? box->root() : 0; |
| } |
| |
| static VisiblePosition positionAvoidingFirstPositionInTable(const VisiblePosition& c) |
| { |
| // return table offset 0 instead of the first VisiblePosition inside the table |
| VisiblePosition previous = c.previous(); |
| if (isLastPositionBeforeTable(previous) && isEditablePosition(previous.deepEquivalent())) |
| return previous; |
| |
| return c; |
| } |
| |
| static VisiblePosition startPositionForLine(const VisiblePosition& c) |
| { |
| if (c.isNull()) |
| return VisiblePosition(); |
| |
| RootInlineBox *rootBox = rootBoxForLine(c); |
| if (!rootBox) { |
| // There are VisiblePositions at offset 0 in blocks without |
| // RootInlineBoxes, like empty editable blocks and bordered blocks. |
| Position p = c.deepEquivalent(); |
| if (p.deprecatedNode()->renderer() && p.deprecatedNode()->renderer()->isRenderBlock() && !p.deprecatedEditingOffset()) |
| return positionAvoidingFirstPositionInTable(c); |
| |
| return VisiblePosition(); |
| } |
| |
| // Generated content (e.g. list markers and CSS :before and :after |
| // pseudoelements) have no corresponding DOM element, and so cannot be |
| // represented by a VisiblePosition. Use whatever follows instead. |
| InlineBox *startBox = rootBox->firstLeafChild(); |
| Node *startNode; |
| while (1) { |
| if (!startBox) |
| return VisiblePosition(); |
| |
| RenderObject *startRenderer = startBox->renderer(); |
| if (!startRenderer) |
| return VisiblePosition(); |
| |
| startNode = startRenderer->node(); |
| if (startNode) |
| break; |
| |
| startBox = startBox->nextLeafChild(); |
| } |
| |
| VisiblePosition visPos = startNode->isTextNode() ? VisiblePosition(Position(startNode, static_cast<InlineTextBox *>(startBox)->start(), Position::PositionIsOffsetInAnchor), DOWNSTREAM) |
| : VisiblePosition(positionBeforeNode(startNode), DOWNSTREAM); |
| return positionAvoidingFirstPositionInTable(visPos); |
| } |
| |
| VisiblePosition startOfLine(const VisiblePosition& c) |
| { |
| VisiblePosition visPos = startPositionForLine(c); |
| |
| return c.honorEditableBoundaryAtOrBefore(visPos); |
| } |
| |
| static VisiblePosition endPositionForLine(const VisiblePosition& c) |
| { |
| if (c.isNull()) |
| return VisiblePosition(); |
| |
| RootInlineBox *rootBox = rootBoxForLine(c); |
| if (!rootBox) { |
| // There are VisiblePositions at offset 0 in blocks without |
| // RootInlineBoxes, like empty editable blocks and bordered blocks. |
| Position p = c.deepEquivalent(); |
| if (p.deprecatedNode()->renderer() && p.deprecatedNode()->renderer()->isRenderBlock() && !p.deprecatedEditingOffset()) |
| return c; |
| return VisiblePosition(); |
| } |
| |
| // Generated content (e.g. list markers and CSS :before and :after |
| // pseudoelements) have no corresponding DOM element, and so cannot be |
| // represented by a VisiblePosition. Use whatever precedes instead. |
| Node *endNode; |
| InlineBox *endBox = rootBox->lastLeafChild(); |
| while (1) { |
| if (!endBox) |
| return VisiblePosition(); |
| |
| RenderObject *endRenderer = endBox->renderer(); |
| if (!endRenderer) |
| return VisiblePosition(); |
| |
| endNode = endRenderer->node(); |
| if (endNode) |
| break; |
| |
| endBox = endBox->prevLeafChild(); |
| } |
| |
| Position pos; |
| if (endNode->hasTagName(brTag)) { |
| pos = positionBeforeNode(endNode); |
| } else if (endBox->isInlineTextBox()) { |
| InlineTextBox *endTextBox = static_cast<InlineTextBox *>(endBox); |
| int endOffset = endTextBox->start(); |
| if (!endTextBox->isLineBreak()) |
| endOffset += endTextBox->len(); |
| pos = Position(endNode, endOffset, Position::PositionIsOffsetInAnchor); |
| } else |
| pos = positionAfterNode(endNode); |
| |
| return VisiblePosition(pos, VP_UPSTREAM_IF_POSSIBLE); |
| } |
| |
| VisiblePosition endOfLine(const VisiblePosition& c) |
| { |
| VisiblePosition visPos = endPositionForLine(c); |
| |
| // Make sure the end of line is at the same line as the given input position. Else use the previous position to |
| // obtain end of line. This condition happens when the input position is before the space character at the end |
| // of a soft-wrapped non-editable line. In this scenario, endPositionForLine would incorrectly hand back a position |
| // in the next line instead. This fix is to account for the discrepancy between lines with webkit-line-break:after-white-space style |
| // versus lines without that style, which would break before a space by default. |
| if (!inSameLine(c, visPos)) { |
| visPos = c.previous(); |
| if (visPos.isNull()) |
| return VisiblePosition(); |
| visPos = endPositionForLine(visPos); |
| } |
| |
| return c.honorEditableBoundaryAtOrAfter(visPos); |
| } |
| |
| bool inSameLine(const VisiblePosition &a, const VisiblePosition &b) |
| { |
| return a.isNotNull() && startOfLine(a) == startOfLine(b); |
| } |
| |
| bool isStartOfLine(const VisiblePosition &p) |
| { |
| return p.isNotNull() && p == startOfLine(p); |
| } |
| |
| bool isEndOfLine(const VisiblePosition &p) |
| { |
| return p.isNotNull() && p == endOfLine(p); |
| } |
| |
| // The first leaf before node that has the same editability as node. |
| static Node* previousLeafWithSameEditability(Node* node) |
| { |
| bool editable = node->rendererIsEditable(); |
| Node* n = node->previousLeafNode(); |
| while (n) { |
| if (editable == n->rendererIsEditable()) |
| return n; |
| n = n->previousLeafNode(); |
| } |
| return 0; |
| } |
| |
| static Node* enclosingNodeWithNonInlineRenderer(Node* n) |
| { |
| for (Node* p = n; p; p = p->parentNode()) { |
| if (p->renderer() && !p->renderer()->isInline()) |
| return p; |
| } |
| return 0; |
| } |
| |
| VisiblePosition previousLinePosition(const VisiblePosition &visiblePosition, int x) |
| { |
| Position p = visiblePosition.deepEquivalent(); |
| Node* node = p.deprecatedNode(); |
| Node* highestRoot = highestEditableRoot(p); |
| if (!node) |
| return VisiblePosition(); |
| |
| node->document()->updateLayoutIgnorePendingStylesheets(); |
| |
| RenderObject *renderer = node->renderer(); |
| if (!renderer) |
| return VisiblePosition(); |
| |
| RenderBlock *containingBlock = 0; |
| RootInlineBox *root = 0; |
| InlineBox* box; |
| int ignoredCaretOffset; |
| visiblePosition.getInlineBoxAndOffset(box, ignoredCaretOffset); |
| if (box) { |
| root = box->root()->prevRootBox(); |
| // We want to skip zero height boxes. |
| // This could happen in case it is a TrailingFloatsRootInlineBox. |
| if (root && root->logicalHeight()) |
| containingBlock = renderer->containingBlock(); |
| else |
| root = 0; |
| } |
| |
| if (!root) { |
| // This containing editable block does not have a previous line. |
| // Need to move back to previous containing editable block in this root editable |
| // block and find the last root line box in that block. |
| Node* startBlock = enclosingNodeWithNonInlineRenderer(node); |
| Node* n = previousLeafWithSameEditability(node); |
| while (n && startBlock == enclosingNodeWithNonInlineRenderer(n)) |
| n = previousLeafWithSameEditability(n); |
| while (n) { |
| if (highestEditableRoot(firstPositionInOrBeforeNode(n)) != highestRoot) |
| break; |
| Position pos(n, caretMinOffset(n)); |
| if (pos.isCandidate()) { |
| RenderObject* o = n->renderer(); |
| ASSERT(o); |
| if (canHaveCursor(o)) { |
| Position maxPos(n, caretMaxOffset(n)); |
| maxPos.getInlineBoxAndOffset(DOWNSTREAM, box, ignoredCaretOffset); |
| if (box) { |
| // previous root line box found |
| root = box->root(); |
| containingBlock = n->renderer()->containingBlock(); |
| break; |
| } |
| |
| return VisiblePosition(pos, DOWNSTREAM); |
| } |
| } |
| n = previousLeafWithSameEditability(n); |
| } |
| } |
| |
| if (root) { |
| // FIXME: Can be wrong for multi-column layout and with transforms. |
| FloatPoint absPos = containingBlock->localToAbsolute(FloatPoint()); |
| if (containingBlock->hasOverflowClip()) |
| absPos -= containingBlock->layer()->scrolledContentOffset(); |
| RenderObject* renderer = root->closestLeafChildForLogicalLeftPosition(x - absPos.x(), isEditablePosition(p))->renderer(); |
| Node* node = renderer->node(); |
| if (node && editingIgnoresContent(node)) |
| return positionInParentBeforeNode(node); |
| return renderer->positionForPoint(IntPoint(x - absPos.x(), root->lineTop())); |
| } |
| |
| // Could not find a previous line. This means we must already be on the first line. |
| // Move to the start of the content in this block, which effectively moves us |
| // to the start of the line we're on. |
| Element* rootElement = node->rendererIsEditable() ? node->rootEditableElement() : node->document()->documentElement(); |
| if (!rootElement) |
| return VisiblePosition(); |
| return VisiblePosition(firstPositionInNode(rootElement), DOWNSTREAM); |
| } |
| |
| static Node* nextLeafWithSameEditability(Node* node, int offset) |
| { |
| bool editable = node->rendererIsEditable(); |
| ASSERT(offset >= 0); |
| Node* child = node->childNode(offset); |
| Node* n = child ? child->nextLeafNode() : node->lastDescendant()->nextLeafNode(); |
| while (n) { |
| if (editable == n->rendererIsEditable()) |
| return n; |
| n = n->nextLeafNode(); |
| } |
| return 0; |
| } |
| |
| static Node* nextLeafWithSameEditability(Node* node) |
| { |
| if (!node) |
| return 0; |
| |
| bool editable = node->rendererIsEditable(); |
| Node* n = node->nextLeafNode(); |
| while (n) { |
| if (editable == n->rendererIsEditable()) |
| return n; |
| n = n->nextLeafNode(); |
| } |
| return 0; |
| } |
| |
| VisiblePosition nextLinePosition(const VisiblePosition &visiblePosition, int x) |
| { |
| Position p = visiblePosition.deepEquivalent(); |
| Node* node = p.deprecatedNode(); |
| Node* highestRoot = highestEditableRoot(p); |
| if (!node) |
| return VisiblePosition(); |
| |
| node->document()->updateLayoutIgnorePendingStylesheets(); |
| |
| RenderObject *renderer = node->renderer(); |
| if (!renderer) |
| return VisiblePosition(); |
| |
| RenderBlock *containingBlock = 0; |
| RootInlineBox *root = 0; |
| InlineBox* box; |
| int ignoredCaretOffset; |
| visiblePosition.getInlineBoxAndOffset(box, ignoredCaretOffset); |
| if (box) { |
| root = box->root()->nextRootBox(); |
| // We want to skip zero height boxes. |
| // This could happen in case it is a TrailingFloatsRootInlineBox. |
| if (root && root->logicalHeight()) |
| containingBlock = renderer->containingBlock(); |
| else |
| root = 0; |
| } |
| |
| if (!root) { |
| // This containing editable block does not have a next line. |
| // Need to move forward to next containing editable block in this root editable |
| // block and find the first root line box in that block. |
| Node* startBlock = enclosingNodeWithNonInlineRenderer(node); |
| Node* n = nextLeafWithSameEditability(node, p.deprecatedEditingOffset()); |
| while (n && startBlock == enclosingNodeWithNonInlineRenderer(n)) |
| n = nextLeafWithSameEditability(n); |
| while (n) { |
| if (highestEditableRoot(firstPositionInOrBeforeNode(n)) != highestRoot) |
| break; |
| Position pos(n, caretMinOffset(n)); |
| if (pos.isCandidate()) { |
| ASSERT(n->renderer()); |
| pos.getInlineBoxAndOffset(DOWNSTREAM, box, ignoredCaretOffset); |
| if (box) { |
| // next root line box found |
| root = box->root(); |
| containingBlock = n->renderer()->containingBlock(); |
| break; |
| } |
| |
| return VisiblePosition(pos, DOWNSTREAM); |
| } |
| n = nextLeafWithSameEditability(n); |
| } |
| } |
| |
| if (root) { |
| // FIXME: Can be wrong for multi-column layout and with transforms. |
| FloatPoint absPos = containingBlock->localToAbsolute(FloatPoint()); |
| if (containingBlock->hasOverflowClip()) |
| absPos -= containingBlock->layer()->scrolledContentOffset(); |
| RenderObject* renderer = root->closestLeafChildForLogicalLeftPosition(x - absPos.x(), isEditablePosition(p))->renderer(); |
| Node* node = renderer->node(); |
| if (node && editingIgnoresContent(node)) |
| return positionInParentBeforeNode(node); |
| return renderer->positionForPoint(IntPoint(x - absPos.x(), root->lineTop())); |
| } |
| |
| // Could not find a next line. This means we must already be on the last line. |
| // Move to the end of the content in this block, which effectively moves us |
| // to the end of the line we're on. |
| Element* rootElement = node->rendererIsEditable() ? node->rootEditableElement() : node->document()->documentElement(); |
| if (!rootElement) |
| return VisiblePosition(); |
| return VisiblePosition(lastPositionInNode(rootElement), DOWNSTREAM); |
| } |
| |
| // --------- |
| |
| static unsigned startSentenceBoundary(const UChar* characters, unsigned length, unsigned, BoundarySearchContextAvailability, bool&) |
| { |
| TextBreakIterator* iterator = sentenceBreakIterator(characters, length); |
| // FIXME: The following function can return -1; we don't handle that. |
| return textBreakPreceding(iterator, length); |
| } |
| |
| VisiblePosition startOfSentence(const VisiblePosition &c) |
| { |
| return previousBoundary(c, startSentenceBoundary); |
| } |
| |
| static unsigned endSentenceBoundary(const UChar* characters, unsigned length, unsigned, BoundarySearchContextAvailability, bool&) |
| { |
| TextBreakIterator* iterator = sentenceBreakIterator(characters, length); |
| return textBreakNext(iterator); |
| } |
| |
| // FIXME: This includes the space after the punctuation that marks the end of the sentence. |
| VisiblePosition endOfSentence(const VisiblePosition &c) |
| { |
| return nextBoundary(c, endSentenceBoundary); |
| } |
| |
| static unsigned previousSentencePositionBoundary(const UChar* characters, unsigned length, unsigned, BoundarySearchContextAvailability, bool&) |
| { |
| // FIXME: This is identical to startSentenceBoundary. I'm pretty sure that's not right. |
| TextBreakIterator* iterator = sentenceBreakIterator(characters, length); |
| // FIXME: The following function can return -1; we don't handle that. |
| return textBreakPreceding(iterator, length); |
| } |
| |
| VisiblePosition previousSentencePosition(const VisiblePosition &c) |
| { |
| VisiblePosition prev = previousBoundary(c, previousSentencePositionBoundary); |
| return c.honorEditableBoundaryAtOrBefore(prev); |
| } |
| |
| static unsigned nextSentencePositionBoundary(const UChar* characters, unsigned length, unsigned, BoundarySearchContextAvailability, bool&) |
| { |
| // FIXME: This is identical to endSentenceBoundary. This isn't right, it needs to |
| // move to the equivlant position in the following sentence. |
| TextBreakIterator* iterator = sentenceBreakIterator(characters, length); |
| return textBreakFollowing(iterator, 0); |
| } |
| |
| VisiblePosition nextSentencePosition(const VisiblePosition &c) |
| { |
| VisiblePosition next = nextBoundary(c, nextSentencePositionBoundary); |
| return c.honorEditableBoundaryAtOrAfter(next); |
| } |
| |
| VisiblePosition startOfParagraph(const VisiblePosition& c, EditingBoundaryCrossingRule boundaryCrossingRule) |
| { |
| Position p = c.deepEquivalent(); |
| Node* startNode = p.deprecatedNode(); |
| |
| if (!startNode) |
| return VisiblePosition(); |
| |
| if (isRenderedAsNonInlineTableImageOrHR(startNode)) |
| return positionBeforeNode(startNode); |
| |
| Node* startBlock = enclosingBlock(startNode); |
| |
| Node* node = startNode; |
| Node* highestRoot = highestEditableRoot(p); |
| int offset = p.deprecatedEditingOffset(); |
| Position::AnchorType type = p.anchorType(); |
| |
| Node* n = startNode; |
| while (n) { |
| if (boundaryCrossingRule == CannotCrossEditingBoundary && n->rendererIsEditable() != startNode->rendererIsEditable()) |
| break; |
| if (boundaryCrossingRule == CanSkipOverEditingBoundary) { |
| while (n && n->rendererIsEditable() != startNode->rendererIsEditable()) |
| n = n->traversePreviousNodePostOrder(startBlock); |
| if (!n || !n->isDescendantOf(highestRoot)) |
| break; |
| } |
| RenderObject *r = n->renderer(); |
| if (!r) { |
| n = n->traversePreviousNodePostOrder(startBlock); |
| continue; |
| } |
| RenderStyle *style = r->style(); |
| if (style->visibility() != VISIBLE) { |
| n = n->traversePreviousNodePostOrder(startBlock); |
| continue; |
| } |
| |
| if (r->isBR() || isBlock(n)) |
| break; |
| |
| if (r->isText() && r->caretMaxRenderedOffset() > 0) { |
| type = Position::PositionIsOffsetInAnchor; |
| if (style->preserveNewline()) { |
| const UChar* chars = toRenderText(r)->characters(); |
| int i = toRenderText(r)->textLength(); |
| int o = offset; |
| if (n == startNode && o < i) |
| i = max(0, o); |
| while (--i >= 0) |
| if (chars[i] == '\n') |
| return VisiblePosition(Position(n, i + 1, Position::PositionIsOffsetInAnchor), DOWNSTREAM); |
| } |
| node = n; |
| offset = 0; |
| n = n->traversePreviousNodePostOrder(startBlock); |
| } else if (editingIgnoresContent(n) || isTableElement(n)) { |
| node = n; |
| type = Position::PositionIsBeforeAnchor; |
| n = n->previousSibling() ? n->previousSibling() : n->traversePreviousNodePostOrder(startBlock); |
| } else |
| n = n->traversePreviousNodePostOrder(startBlock); |
| } |
| |
| if (type == Position::PositionIsOffsetInAnchor) |
| return VisiblePosition(Position(node, offset, type), DOWNSTREAM); |
| |
| return VisiblePosition(Position(node, type), DOWNSTREAM); |
| } |
| |
| VisiblePosition endOfParagraph(const VisiblePosition &c, EditingBoundaryCrossingRule boundaryCrossingRule) |
| { |
| if (c.isNull()) |
| return VisiblePosition(); |
| |
| Position p = c.deepEquivalent(); |
| Node* startNode = p.deprecatedNode(); |
| |
| if (isRenderedAsNonInlineTableImageOrHR(startNode)) |
| return positionAfterNode(startNode); |
| |
| Node* startBlock = enclosingBlock(startNode); |
| Node* stayInsideBlock = startBlock; |
| |
| Node* node = startNode; |
| Node* highestRoot = highestEditableRoot(p); |
| int offset = p.deprecatedEditingOffset(); |
| Position::AnchorType type = p.anchorType(); |
| |
| Node* n = startNode; |
| while (n) { |
| if (boundaryCrossingRule == CannotCrossEditingBoundary && n->rendererIsEditable() != startNode->rendererIsEditable()) |
| break; |
| if (boundaryCrossingRule == CanSkipOverEditingBoundary) { |
| while (n && n->rendererIsEditable() != startNode->rendererIsEditable()) |
| n = n->traverseNextNode(stayInsideBlock); |
| if (!n || !n->isDescendantOf(highestRoot)) |
| break; |
| } |
| |
| RenderObject *r = n->renderer(); |
| if (!r) { |
| n = n->traverseNextNode(stayInsideBlock); |
| continue; |
| } |
| RenderStyle *style = r->style(); |
| if (style->visibility() != VISIBLE) { |
| n = n->traverseNextNode(stayInsideBlock); |
| continue; |
| } |
| |
| if (r->isBR() || isBlock(n)) |
| break; |
| |
| // FIXME: We avoid returning a position where the renderer can't accept the caret. |
| if (r->isText() && r->caretMaxRenderedOffset() > 0) { |
| int length = toRenderText(r)->textLength(); |
| type = Position::PositionIsOffsetInAnchor; |
| if (style->preserveNewline()) { |
| const UChar* chars = toRenderText(r)->characters(); |
| int o = n == startNode ? offset : 0; |
| for (int i = o; i < length; ++i) |
| if (chars[i] == '\n') |
| return VisiblePosition(Position(n, i, Position::PositionIsOffsetInAnchor), DOWNSTREAM); |
| } |
| node = n; |
| offset = r->caretMaxOffset(); |
| n = n->traverseNextNode(stayInsideBlock); |
| } else if (editingIgnoresContent(n) || isTableElement(n)) { |
| node = n; |
| type = Position::PositionIsAfterAnchor; |
| n = n->traverseNextSibling(stayInsideBlock); |
| } else |
| n = n->traverseNextNode(stayInsideBlock); |
| } |
| |
| if (type == Position::PositionIsOffsetInAnchor) |
| return VisiblePosition(Position(node, offset, type), DOWNSTREAM); |
| |
| return VisiblePosition(Position(node, type), DOWNSTREAM); |
| } |
| |
| // FIXME: isStartOfParagraph(startOfNextParagraph(pos)) is not always true |
| VisiblePosition startOfNextParagraph(const VisiblePosition& visiblePosition) |
| { |
| VisiblePosition paragraphEnd(endOfParagraph(visiblePosition, CanSkipOverEditingBoundary)); |
| VisiblePosition afterParagraphEnd(paragraphEnd.next(CannotCrossEditingBoundary)); |
| // The position after the last position in the last cell of a table |
| // is not the start of the next paragraph. |
| if (isFirstPositionAfterTable(afterParagraphEnd)) |
| return afterParagraphEnd.next(CannotCrossEditingBoundary); |
| return afterParagraphEnd; |
| } |
| |
| bool inSameParagraph(const VisiblePosition &a, const VisiblePosition &b, EditingBoundaryCrossingRule boundaryCrossingRule) |
| { |
| return a.isNotNull() && startOfParagraph(a, boundaryCrossingRule) == startOfParagraph(b, boundaryCrossingRule); |
| } |
| |
| bool isStartOfParagraph(const VisiblePosition &pos, EditingBoundaryCrossingRule boundaryCrossingRule) |
| { |
| return pos.isNotNull() && pos == startOfParagraph(pos, boundaryCrossingRule); |
| } |
| |
| bool isEndOfParagraph(const VisiblePosition &pos, EditingBoundaryCrossingRule boundaryCrossingRule) |
| { |
| return pos.isNotNull() && pos == endOfParagraph(pos, boundaryCrossingRule); |
| } |
| |
| VisiblePosition previousParagraphPosition(const VisiblePosition& p, int x) |
| { |
| VisiblePosition pos = p; |
| do { |
| VisiblePosition n = previousLinePosition(pos, x); |
| if (n.isNull() || n == pos) |
| break; |
| pos = n; |
| } while (inSameParagraph(p, pos)); |
| return pos; |
| } |
| |
| VisiblePosition nextParagraphPosition(const VisiblePosition& p, int x) |
| { |
| VisiblePosition pos = p; |
| do { |
| VisiblePosition n = nextLinePosition(pos, x); |
| if (n.isNull() || n == pos) |
| break; |
| pos = n; |
| } while (inSameParagraph(p, pos)); |
| return pos; |
| } |
| |
| // --------- |
| |
| VisiblePosition startOfBlock(const VisiblePosition& visiblePosition, EditingBoundaryCrossingRule rule) |
| { |
| Position position = visiblePosition.deepEquivalent(); |
| Node* startBlock; |
| if (!position.containerNode() || !(startBlock = enclosingBlock(position.containerNode(), rule))) |
| return VisiblePosition(); |
| return firstPositionInNode(startBlock); |
| } |
| |
| VisiblePosition endOfBlock(const VisiblePosition& visiblePosition, EditingBoundaryCrossingRule rule) |
| { |
| Position position = visiblePosition.deepEquivalent(); |
| Node* endBlock; |
| if (!position.containerNode() || !(endBlock = enclosingBlock(position.containerNode(), rule))) |
| return VisiblePosition(); |
| return lastPositionInNode(endBlock); |
| } |
| |
| bool inSameBlock(const VisiblePosition &a, const VisiblePosition &b) |
| { |
| return !a.isNull() && enclosingBlock(a.deepEquivalent().containerNode()) == enclosingBlock(b.deepEquivalent().containerNode()); |
| } |
| |
| bool isStartOfBlock(const VisiblePosition &pos) |
| { |
| return pos.isNotNull() && pos == startOfBlock(pos, CanCrossEditingBoundary); |
| } |
| |
| bool isEndOfBlock(const VisiblePosition &pos) |
| { |
| return pos.isNotNull() && pos == endOfBlock(pos, CanCrossEditingBoundary); |
| } |
| |
| // --------- |
| |
| VisiblePosition startOfDocument(const Node* node) |
| { |
| if (!node) |
| return VisiblePosition(); |
| |
| return VisiblePosition(firstPositionInNode(node->document()->documentElement()), DOWNSTREAM); |
| } |
| |
| VisiblePosition startOfDocument(const VisiblePosition &c) |
| { |
| return startOfDocument(c.deepEquivalent().deprecatedNode()); |
| } |
| |
| VisiblePosition endOfDocument(const Node* node) |
| { |
| if (!node || !node->document() || !node->document()->documentElement()) |
| return VisiblePosition(); |
| |
| Element* doc = node->document()->documentElement(); |
| return VisiblePosition(lastPositionInNode(doc), DOWNSTREAM); |
| } |
| |
| VisiblePosition endOfDocument(const VisiblePosition &c) |
| { |
| return endOfDocument(c.deepEquivalent().deprecatedNode()); |
| } |
| |
| bool inSameDocument(const VisiblePosition &a, const VisiblePosition &b) |
| { |
| Position ap = a.deepEquivalent(); |
| Node* an = ap.deprecatedNode(); |
| if (!an) |
| return false; |
| Position bp = b.deepEquivalent(); |
| Node* bn = bp.deprecatedNode(); |
| if (an == bn) |
| return true; |
| |
| return an->document() == bn->document(); |
| } |
| |
| bool isStartOfDocument(const VisiblePosition &p) |
| { |
| return p.isNotNull() && p.previous().isNull(); |
| } |
| |
| bool isEndOfDocument(const VisiblePosition &p) |
| { |
| return p.isNotNull() && p.next().isNull(); |
| } |
| |
| // --------- |
| |
| VisiblePosition startOfEditableContent(const VisiblePosition& visiblePosition) |
| { |
| Node* highestRoot = highestEditableRoot(visiblePosition.deepEquivalent()); |
| if (!highestRoot) |
| return VisiblePosition(); |
| |
| return firstPositionInNode(highestRoot); |
| } |
| |
| VisiblePosition endOfEditableContent(const VisiblePosition& visiblePosition) |
| { |
| Node* highestRoot = highestEditableRoot(visiblePosition.deepEquivalent()); |
| if (!highestRoot) |
| return VisiblePosition(); |
| |
| return lastPositionInNode(highestRoot); |
| } |
| |
| static VisiblePosition logicalStartPositionForLine(const VisiblePosition& c) |
| { |
| if (c.isNull()) |
| return VisiblePosition(); |
| |
| RootInlineBox* rootBox = rootBoxForLine(c); |
| if (!rootBox) { |
| // There are VisiblePositions at offset 0 in blocks without |
| // RootInlineBoxes, like empty editable blocks and bordered blocks. |
| Position p = c.deepEquivalent(); |
| if (p.deprecatedNode()->renderer() && p.deprecatedNode()->renderer()->isRenderBlock() && !p.deprecatedEditingOffset()) |
| return positionAvoidingFirstPositionInTable(c); |
| |
| return VisiblePosition(); |
| } |
| |
| InlineBox* logicalStartBox; |
| Node* logicalStartNode = rootBox->getLogicalStartBoxWithNode(logicalStartBox); |
| |
| if (!logicalStartNode) |
| return VisiblePosition(); |
| |
| VisiblePosition visPos = logicalStartNode->isTextNode() ? VisiblePosition(Position(logicalStartNode, logicalStartBox->caretMinOffset(), Position::PositionIsOffsetInAnchor), DOWNSTREAM) |
| : VisiblePosition(positionBeforeNode(logicalStartNode), DOWNSTREAM); |
| return positionAvoidingFirstPositionInTable(visPos); |
| } |
| |
| VisiblePosition logicalStartOfLine(const VisiblePosition& c) |
| { |
| // TODO: this is the current behavior that might need to be fixed. |
| // Please refer to https://bugs.webkit.org/show_bug.cgi?id=49107 for detail. |
| VisiblePosition visPos = logicalStartPositionForLine(c); |
| |
| return c.honorEditableBoundaryAtOrBefore(visPos); |
| } |
| |
| static VisiblePosition logicalEndPositionForLine(const VisiblePosition& c) |
| { |
| if (c.isNull()) |
| return VisiblePosition(); |
| |
| RootInlineBox* rootBox = rootBoxForLine(c); |
| if (!rootBox) { |
| // There are VisiblePositions at offset 0 in blocks without |
| // RootInlineBoxes, like empty editable blocks and bordered blocks. |
| Position p = c.deepEquivalent(); |
| if (p.deprecatedNode()->renderer() && p.deprecatedNode()->renderer()->isRenderBlock() && !p.deprecatedEditingOffset()) |
| return c; |
| return VisiblePosition(); |
| } |
| |
| InlineBox* logicalEndBox; |
| Node* logicalEndNode = rootBox->getLogicalEndBoxWithNode(logicalEndBox); |
| |
| if (!logicalEndNode) |
| return VisiblePosition(); |
| |
| Position pos; |
| if (logicalEndNode->hasTagName(brTag)) |
| pos = positionBeforeNode(logicalEndNode); |
| else if (logicalEndBox->isInlineTextBox()) { |
| InlineTextBox* endTextBox = static_cast<InlineTextBox*>(logicalEndBox); |
| int endOffset = endTextBox->start(); |
| if (!endTextBox->isLineBreak()) |
| endOffset += endTextBox->len(); |
| pos = Position(logicalEndNode, endOffset, Position::PositionIsOffsetInAnchor); |
| } else |
| pos = positionAfterNode(logicalEndNode); |
| |
| return VisiblePosition(pos, VP_UPSTREAM_IF_POSSIBLE); |
| } |
| |
| bool inSameLogicalLine(const VisiblePosition& a, const VisiblePosition& b) |
| { |
| return a.isNotNull() && logicalStartOfLine(a) == logicalStartOfLine(b); |
| } |
| |
| VisiblePosition logicalEndOfLine(const VisiblePosition& c) |
| { |
| // TODO: this is the current behavior that might need to be fixed. |
| // Please refer to https://bugs.webkit.org/show_bug.cgi?id=49107 for detail. |
| |
| VisiblePosition visPos = logicalEndPositionForLine(c); |
| |
| // Make sure the end of line is at the same line as the given input position. For a wrapping line, the logical end |
| // position for the not-last-2-lines might incorrectly hand back the logical beginning of the next line. |
| // For example, <div contenteditable dir="rtl" style="line-break:before-white-space">abcdefg abcdefg abcdefg |
| // a abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg </div> |
| // In this case, use the previous position of the computed logical end position. |
| if (!inSameLogicalLine(c, visPos)) |
| visPos = visPos.previous(); |
| |
| return c.honorEditableBoundaryAtOrAfter(visPos); |
| } |
| |
| VisiblePosition leftBoundaryOfLine(const VisiblePosition& c, TextDirection direction) |
| { |
| return direction == LTR ? logicalStartOfLine(c) : logicalEndOfLine(c); |
| } |
| |
| VisiblePosition rightBoundaryOfLine(const VisiblePosition& c, TextDirection direction) |
| { |
| return direction == LTR ? logicalEndOfLine(c) : logicalStartOfLine(c); |
| } |
| |
| static const int invalidOffset = -1; |
| |
| static VisiblePosition previousWordBreakInBoxInsideBlockWithSameDirectionality(const InlineBox* box, const VisiblePosition& previousWordBreak, int& offsetOfWordBreak) |
| { |
| bool hasSeenWordBreakInThisBox = previousWordBreak.isNotNull(); |
| // In a LTR block, the word break should be on the left boundary of a word. |
| // In a RTL block, the word break should be on the right boundary of a word. |
| // Because nextWordPosition() returns the word break on the right boundary of the word for LTR text, |
| // we need to use previousWordPosition() to traverse words within the inline boxes from right to left |
| // to find the previous word break (i.e. the first word break on the left). The same applies to RTL text. |
| |
| VisiblePosition wordBreak = hasSeenWordBreakInThisBox ? previousWordBreak : Position(box->renderer()->node(), box->caretMaxOffset(), Position::PositionIsOffsetInAnchor); |
| |
| // FIXME: handle multi-spaces (http://webkit.org/b/57543). |
| |
| wordBreak = previousWordPosition(wordBreak); |
| if (previousWordBreak == wordBreak) |
| return VisiblePosition(); |
| |
| InlineBox* boxContainingPreviousWordBreak; |
| wordBreak.getInlineBoxAndOffset(boxContainingPreviousWordBreak, offsetOfWordBreak); |
| if (boxContainingPreviousWordBreak != box) |
| return VisiblePosition(); |
| return wordBreak; |
| } |
| |
| static VisiblePosition leftmostPositionInRTLBoxInLTRBlock(const InlineBox* box) |
| { |
| // FIXME: Probably need to take care of bidi level too. |
| Node* node = box->renderer()->node(); |
| InlineBox* previousLeaf = box->prevLeafChild(); |
| InlineBox* nextLeaf = box->nextLeafChild(); |
| |
| if (previousLeaf && !previousLeaf->isLeftToRightDirection()) |
| return Position(node, box->caretMaxOffset(), Position::PositionIsOffsetInAnchor); |
| |
| if (nextLeaf && !nextLeaf->isLeftToRightDirection()) { |
| if (previousLeaf) |
| return Position(previousLeaf->renderer()->node(), previousLeaf->caretMaxOffset(), Position::PositionIsOffsetInAnchor); |
| |
| InlineBox* lastRTLLeaf; |
| do { |
| lastRTLLeaf = nextLeaf; |
| nextLeaf = nextLeaf->nextLeafChild(); |
| } while (nextLeaf && !nextLeaf->isLeftToRightDirection()); |
| return Position(lastRTLLeaf->renderer()->node(), lastRTLLeaf->caretMinOffset(), Position::PositionIsOffsetInAnchor); |
| } |
| |
| return Position(node, box->caretMinOffset(), Position::PositionIsOffsetInAnchor); |
| } |
| |
| static VisiblePosition rightmostPositionInLTRBoxInRTLBlock(const InlineBox* box) |
| { |
| // FIXME: Probably need to take care of bidi level too. |
| Node* node = box->renderer()->node(); |
| InlineBox* previousLeaf = box->prevLeafChild(); |
| InlineBox* nextLeaf = box->nextLeafChild(); |
| |
| if (nextLeaf && nextLeaf->isLeftToRightDirection()) |
| return Position(node, box->caretMaxOffset(), Position::PositionIsOffsetInAnchor); |
| |
| if (previousLeaf && previousLeaf->isLeftToRightDirection()) { |
| if (nextLeaf) |
| return Position(nextLeaf->renderer()->node(), nextLeaf->caretMaxOffset(), Position::PositionIsOffsetInAnchor); |
| |
| InlineBox* firstLTRLeaf; |
| do { |
| firstLTRLeaf = previousLeaf; |
| previousLeaf = previousLeaf->prevLeafChild(); |
| } while (previousLeaf && previousLeaf->isLeftToRightDirection()); |
| return Position(firstLTRLeaf->renderer()->node(), firstLTRLeaf->caretMinOffset(), Position::PositionIsOffsetInAnchor); |
| } |
| |
| return Position(node, box->caretMinOffset(), Position::PositionIsOffsetInAnchor); |
| } |
| |
| static VisiblePosition lastWordBreakInBox(const InlineBox* box, int& offsetOfWordBreak) |
| { |
| // Add the leftmost word break for RTL box or rightmost word break for LTR box. |
| InlineBox* previousLeaf = box->prevLeafChild(); |
| InlineBox* nextLeaf = box->nextLeafChild(); |
| VisiblePosition boundaryPosition; |
| if (box->direction() == RTL && (!previousLeaf || previousLeaf->isLeftToRightDirection())) |
| boundaryPosition = leftmostPositionInRTLBoxInLTRBlock(box); |
| else if (box->direction() == LTR && (!nextLeaf || !nextLeaf->isLeftToRightDirection())) |
| boundaryPosition = rightmostPositionInLTRBoxInRTLBlock(box); |
| |
| if (boundaryPosition.isNull()) |
| return VisiblePosition(); |
| |
| VisiblePosition wordBreak = nextWordPosition(boundaryPosition); |
| if (wordBreak != boundaryPosition) |
| wordBreak = previousWordPosition(wordBreak); |
| |
| InlineBox* boxOfWordBreak; |
| wordBreak.getInlineBoxAndOffset(boxOfWordBreak, offsetOfWordBreak); |
| if (boxOfWordBreak == box) |
| return wordBreak; |
| return VisiblePosition(); |
| } |
| |
| static bool positionIsVisuallyOrderedInBoxInBlockWithDifferentDirectionality(const VisiblePosition& wordBreak, const InlineBox* box, int& offsetOfWordBreak) |
| { |
| int previousOffset = offsetOfWordBreak; |
| InlineBox* boxOfWordBreak; |
| wordBreak.getInlineBoxAndOffset(boxOfWordBreak, offsetOfWordBreak); |
| if (boxOfWordBreak == box && (previousOffset == invalidOffset || previousOffset < offsetOfWordBreak)) |
| return true; |
| return false; |
| } |
| |
| static VisiblePosition nextWordBreakInBoxInsideBlockWithDifferentDirectionality( |
| const InlineBox* box, const VisiblePosition& previousWordBreak, int& offsetOfWordBreak, bool& isLastWordBreakInBox) |
| { |
| // FIXME: Probably need to take care of bidi level too. |
| |
| // In a LTR block, the word break should be on the left boundary of a word. |
| // In a RTL block, the word break should be on the right boundary of a word. |
| // Because previousWordPosition() returns the word break on the right boundary of the word for RTL text, |
| // we need to use nextWordPosition() to traverse words within the inline boxes from right to left to find the next word break. |
| // The same applies to LTR text, in which words are traversed within the inline boxes from left to right. |
| |
| // FIXME: handle multi-spaces (http://webkit.org/b/57543). |
| |
| bool hasSeenWordBreakInThisBox = previousWordBreak.isNotNull(); |
| VisiblePosition wordBreak = hasSeenWordBreakInThisBox ? previousWordBreak : Position(box->renderer()->node(), box->caretMinOffset(), Position::PositionIsOffsetInAnchor); |
| wordBreak = nextWordPosition(wordBreak); |
| |
| if (wordBreak == previousWordBreak) { |
| isLastWordBreakInBox = true; |
| return VisiblePosition(); |
| } |
| |
| |
| // Given RTL box "ABC DEF" either follows a LTR box or is the first visual box in an LTR block as an example, |
| // the visual display of the RTL box is: "(0)J(10)I(9)H(8) (7)F(6)E(5)D(4) (3)C(2)B(1)A(11)", |
| // where the number in parenthesis represents offset in visiblePosition. |
| // Start at offset 0, the first word break is at offset 3, the 2nd word break is at offset 7, and the 3rd word break should be at offset 0. |
| // But nextWordPosition() of offset 7 is offset 11, which should be ignored, |
| // and the position at offset 0 should be manually added as the last word break within the box. |
| if (positionIsVisuallyOrderedInBoxInBlockWithDifferentDirectionality(wordBreak, box, offsetOfWordBreak)) { |
| isLastWordBreakInBox = false; |
| return wordBreak; |
| } |
| |
| isLastWordBreakInBox = true; |
| return lastWordBreakInBox(box, offsetOfWordBreak); |
| } |
| |
| struct WordBoundaryEntry { |
| WordBoundaryEntry() |
| : offsetInInlineBox(invalidOffset) |
| { |
| } |
| |
| WordBoundaryEntry(const VisiblePosition& position, int offset) |
| : visiblePosition(position) |
| , offsetInInlineBox(offset) |
| { |
| } |
| |
| VisiblePosition visiblePosition; |
| int offsetInInlineBox; |
| }; |
| |
| typedef Vector<WordBoundaryEntry, 50> WordBoundaryVector; |
| |
| static void collectWordBreaksInBoxInsideBlockWithSameDirectionality(const InlineBox* box, WordBoundaryVector& orderedWordBoundaries) |
| { |
| orderedWordBoundaries.clear(); |
| |
| VisiblePosition wordBreak; |
| int offsetOfWordBreak = invalidOffset; |
| while (1) { |
| wordBreak = previousWordBreakInBoxInsideBlockWithSameDirectionality(box, wordBreak, offsetOfWordBreak); |
| if (wordBreak.isNull()) |
| break; |
| WordBoundaryEntry wordBoundaryEntry(wordBreak, offsetOfWordBreak); |
| orderedWordBoundaries.append(wordBoundaryEntry); |
| } |
| } |
| |
| static void collectWordBreaksInBoxInsideBlockWithDifferntDirectionality(const InlineBox* box, WordBoundaryVector& orderedWordBoundaries) |
| { |
| orderedWordBoundaries.clear(); |
| |
| VisiblePosition wordBreak; |
| int offsetOfWordBreak = invalidOffset; |
| while (1) { |
| bool isLastWordBreakInBox = false; |
| wordBreak = nextWordBreakInBoxInsideBlockWithDifferentDirectionality(box, wordBreak, offsetOfWordBreak, isLastWordBreakInBox); |
| if (wordBreak.isNotNull()) { |
| WordBoundaryEntry wordBoundaryEntry(wordBreak, offsetOfWordBreak); |
| orderedWordBoundaries.append(wordBoundaryEntry); |
| } |
| if (isLastWordBreakInBox) |
| break; |
| } |
| } |
| |
| static VisiblePosition previousWordBreakInBox(const InlineBox* box, int offset, TextDirection blockDirection) |
| { |
| int offsetOfWordBreak = 0; |
| VisiblePosition wordBreak; |
| while (true) { |
| if (box->direction() == blockDirection) |
| wordBreak = previousWordBreakInBoxInsideBlockWithSameDirectionality(box, wordBreak, offsetOfWordBreak); |
| // FIXME: Implement the 'else' case when the box direction is not equal to the block direction. |
| if (wordBreak.isNull()) |
| break; |
| if (offset == invalidOffset || offsetOfWordBreak != offset) |
| return wordBreak; |
| } |
| return VisiblePosition(); |
| } |
| |
| static int greatestValueUnder(int offset, bool boxAndBlockAreInSameDirection, const WordBoundaryVector& orderedWordBoundaries) |
| { |
| if (!orderedWordBoundaries.size()) |
| return invalidOffset; |
| // FIXME: binary search. |
| if (boxAndBlockAreInSameDirection) { |
| for (unsigned i = 0; i < orderedWordBoundaries.size(); ++i) { |
| if (orderedWordBoundaries[i].offsetInInlineBox < offset) |
| return i; |
| } |
| return invalidOffset; |
| } |
| for (int i = orderedWordBoundaries.size() - 1; i >= 0; --i) { |
| if (orderedWordBoundaries[i].offsetInInlineBox < offset) |
| return i; |
| } |
| return invalidOffset; |
| } |
| |
| static int smallestOffsetAbove(int offset, bool boxAndBlockAreInSameDirection, const WordBoundaryVector& orderedWordBoundaries) |
| { |
| if (!orderedWordBoundaries.size()) |
| return invalidOffset; |
| // FIXME: binary search. |
| if (boxAndBlockAreInSameDirection) { |
| for (int i = orderedWordBoundaries.size() - 1; i >= 0; --i) { |
| if (orderedWordBoundaries[i].offsetInInlineBox > offset) |
| return i; |
| } |
| return invalidOffset; |
| } |
| for (unsigned i = 0; i < orderedWordBoundaries.size(); ++i) { |
| if (orderedWordBoundaries[i].offsetInInlineBox > offset) |
| return i; |
| } |
| return invalidOffset; |
| } |
| |
| static VisiblePosition leftWordBoundary(const InlineBox* box, int offset, TextDirection blockDirection) |
| { |
| VisiblePosition wordBreak; |
| for (const InlineBox* adjacentBox = box; adjacentBox; adjacentBox = adjacentBox->prevLeafChild()) { |
| if (blockDirection == LTR) |
| wordBreak = previousWordBreakInBox(adjacentBox, adjacentBox == box ? offset : invalidOffset, blockDirection); |
| // FIXME: Implement the "else" case. |
| if (wordBreak.isNotNull()) |
| return wordBreak; |
| } |
| return VisiblePosition(); |
| } |
| |
| static VisiblePosition rightWordBoundary(const InlineBox* box, int offset, TextDirection blockDirection) |
| { |
| |
| VisiblePosition wordBreak; |
| for (const InlineBox* adjacentBox = box; adjacentBox; adjacentBox = adjacentBox->nextLeafChild()) { |
| if (blockDirection == RTL) |
| wordBreak = previousWordBreakInBox(adjacentBox, adjacentBox == box ? offset : invalidOffset, blockDirection); |
| // FIXME: Implement the "else" case. |
| if (!wordBreak.isNull()) |
| return wordBreak; |
| } |
| return VisiblePosition(); |
| } |
| |
| static bool positionIsInsideBox(const VisiblePosition& wordBreak, const InlineBox* box) |
| { |
| InlineBox* boxOfWordBreak; |
| int offsetOfWordBreak; |
| wordBreak.getInlineBoxAndOffset(boxOfWordBreak, offsetOfWordBreak); |
| return box == boxOfWordBreak && offsetOfWordBreak != box->caretMaxOffset() && offsetOfWordBreak != box->caretMinOffset(); |
| } |
| |
| static VisiblePosition positionBeforeNextWord(const VisiblePosition& position) |
| { |
| VisiblePosition positionAfterCurrentWord = nextWordPosition(position); |
| VisiblePosition positionAfterNextWord = nextWordPosition(positionAfterCurrentWord); |
| if (positionAfterCurrentWord == positionAfterNextWord) |
| return positionAfterCurrentWord; |
| return previousWordPosition(positionAfterNextWord); |
| } |
| |
| static VisiblePosition positionAfterPreviousWord(const VisiblePosition& position) |
| { |
| VisiblePosition positionBeforeCurrentWord = previousWordPosition(position); |
| VisiblePosition positionBeforePreviousWord = previousWordPosition(positionBeforeCurrentWord); |
| if (positionBeforeCurrentWord == positionBeforePreviousWord) |
| return positionBeforeCurrentWord; |
| return nextWordPosition(positionBeforePreviousWord); |
| } |
| |
| VisiblePosition leftWordPosition(const VisiblePosition& visiblePosition) |
| { |
| InlineBox* box; |
| int offset; |
| visiblePosition.getInlineBoxAndOffset(box, offset); |
| TextDirection blockDirection = directionOfEnclosingBlock(visiblePosition.deepEquivalent()); |
| |
| // FIXME: If the box's directionality is the same as that of the enclosing block, when the offset is at the box boundary |
| // and the direction is towards inside the box, do I still need to make it a special case? For example, a LTR box inside a LTR block, |
| // when offset is at box's caretMinOffset and the direction is DirectionRight, should it be taken care as a general case? |
| if (offset == box->caretLeftmostOffset()) |
| return leftWordBoundary(box->prevLeafChild(), invalidOffset, blockDirection); |
| if (offset == box->caretRightmostOffset()) |
| return leftWordBoundary(box, offset, blockDirection); |
| |
| |
| VisiblePosition wordBreak; |
| if (box->direction() == blockDirection) { |
| if (blockDirection == RTL) |
| wordBreak = positionBeforeNextWord(visiblePosition); |
| else |
| wordBreak = previousWordPosition(visiblePosition); |
| } else { |
| if (blockDirection == RTL) |
| wordBreak = positionAfterPreviousWord(visiblePosition); |
| else |
| wordBreak = nextWordPosition(visiblePosition); |
| } |
| if (positionIsInsideBox(wordBreak, box)) |
| return wordBreak; |
| |
| WordBoundaryVector orderedWordBoundaries; |
| if (box->direction() == blockDirection) |
| collectWordBreaksInBoxInsideBlockWithSameDirectionality(box, orderedWordBoundaries); |
| else |
| collectWordBreaksInBoxInsideBlockWithDifferntDirectionality(box, orderedWordBoundaries); |
| |
| int index = box->isLeftToRightDirection() ? greatestValueUnder(offset, blockDirection == LTR, orderedWordBoundaries) : |
| smallestOffsetAbove(offset, blockDirection == RTL, orderedWordBoundaries); |
| if (index != invalidOffset) |
| return orderedWordBoundaries[index].visiblePosition; |
| |
| return leftWordBoundary(box->prevLeafChild(), invalidOffset, blockDirection); |
| } |
| |
| VisiblePosition rightWordPosition(const VisiblePosition& visiblePosition) |
| { |
| InlineBox* box; |
| int offset; |
| visiblePosition.getInlineBoxAndOffset(box, offset); |
| TextDirection blockDirection = directionOfEnclosingBlock(visiblePosition.deepEquivalent()); |
| |
| if (offset == box->caretLeftmostOffset()) |
| return rightWordBoundary(box, offset, blockDirection); |
| if (offset == box->caretRightmostOffset()) |
| return rightWordBoundary(box->nextLeafChild(), invalidOffset, blockDirection); |
| |
| VisiblePosition wordBreak; |
| if (box->direction() == blockDirection) { |
| if (blockDirection == LTR) |
| wordBreak = positionBeforeNextWord(visiblePosition); |
| else |
| wordBreak = previousWordPosition(visiblePosition); |
| } else { |
| if (blockDirection == LTR) |
| wordBreak = positionAfterPreviousWord(visiblePosition); |
| else |
| wordBreak = nextWordPosition(visiblePosition); |
| } |
| if (positionIsInsideBox(wordBreak, box)) |
| return wordBreak; |
| |
| WordBoundaryVector orderedWordBoundaries; |
| if (box->direction() == blockDirection) |
| collectWordBreaksInBoxInsideBlockWithSameDirectionality(box, orderedWordBoundaries); |
| else |
| collectWordBreaksInBoxInsideBlockWithDifferntDirectionality(box, orderedWordBoundaries); |
| int index = box->isLeftToRightDirection() ? smallestOffsetAbove(offset, blockDirection == LTR, orderedWordBoundaries) : |
| greatestValueUnder(offset, blockDirection == RTL, orderedWordBoundaries); |
| if (index != invalidOffset) |
| return orderedWordBoundaries[index].visiblePosition; |
| |
| return rightWordBoundary(box->nextLeafChild(), invalidOffset, blockDirection); |
| } |
| |
| } |
