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Diffstat (limited to 'WebCore/editing/visible_units.cpp')
| -rw-r--r-- | WebCore/editing/visible_units.cpp | 912 |
1 files changed, 912 insertions, 0 deletions
diff --git a/WebCore/editing/visible_units.cpp b/WebCore/editing/visible_units.cpp new file mode 100644 index 0000000..3bcdc09 --- /dev/null +++ b/WebCore/editing/visible_units.cpp @@ -0,0 +1,912 @@ +/* + * Copyright (C) 2004 Apple Computer, 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 "RenderBlock.h" +#include "RenderLayer.h" +#include "TextBoundaries.h" +#include "TextBreakIterator.h" +#include "TextIterator.h" +#include "htmlediting.h" + +namespace WebCore { + +using namespace HTMLNames; + +static VisiblePosition previousBoundary(const VisiblePosition &c, unsigned (*searchFunction)(const UChar *, unsigned)) +{ + Position pos = c.deepEquivalent(); + Node *n = pos.node(); + if (!n) + return VisiblePosition(); + Document *d = n->document(); + Node *de = d->documentElement(); + if (!de) + return VisiblePosition(); + Node *boundary = n->enclosingBlockFlowElement(); + if (!boundary) + return VisiblePosition(); + bool isContentEditable = boundary->isContentEditable(); + while (boundary && boundary != de && boundary->parentNode() && isContentEditable == boundary->parentNode()->isContentEditable()) + boundary = boundary->parentNode(); + + Position start = rangeCompliantEquivalent(Position(boundary, 0)); + Position end = rangeCompliantEquivalent(pos); + RefPtr<Range> searchRange = new Range(d); + + int exception = 0; + searchRange->setStart(start.node(), start.offset(), exception); + searchRange->setEnd(end.node(), end.offset(), exception); + + ASSERT(!exception); + if (exception) + return VisiblePosition(); + + SimplifiedBackwardsTextIterator it(searchRange.get()); + Vector<UChar, 1024> string; + unsigned next = 0; + bool inTextSecurityMode = start.node() && start.node()->renderer() && start.node()->renderer()->style()->textSecurity() != TSNONE; + 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()); + if (next != 0) + break; + it.advance(); + } + + if (it.atEnd() && next == 0) { + pos = it.range()->startPosition(); + } else if (next != 0) { + Node *node = it.range()->startContainer(exception); + if (node->isTextNode() || (node->renderer() && node->renderer()->isBR())) + // The next variable contains a usable index into a text node + pos = Position(node, next); + else { + // Use the end of the found range, the start is not guaranteed to + // be correct. + Position end = it.range()->endPosition(); + VisiblePosition boundary(end); + unsigned i = it.length() - next; + while (i--) + boundary = boundary.previous(); + return boundary; + } + } + + return VisiblePosition(pos, DOWNSTREAM); +} + +static VisiblePosition nextBoundary(const VisiblePosition &c, unsigned (*searchFunction)(const UChar *, unsigned)) +{ + Position pos = c.deepEquivalent(); + Node *n = pos.node(); + if (!n) + return VisiblePosition(); + Document *d = n->document(); + Node *de = d->documentElement(); + if (!de) + return VisiblePosition(); + Node *boundary = n->enclosingBlockFlowElement(); + if (!boundary) + return VisiblePosition(); + bool isContentEditable = boundary->isContentEditable(); + while (boundary && boundary != de && boundary->parentNode() && isContentEditable == boundary->parentNode()->isContentEditable()) + boundary = boundary->parentNode(); + + RefPtr<Range> searchRange(d->createRange()); + Position start(rangeCompliantEquivalent(pos)); + ExceptionCode ec = 0; + searchRange->selectNodeContents(boundary, ec); + searchRange->setStart(start.node(), start.offset(), ec); + TextIterator it(searchRange.get(), true); + Vector<UChar, 1024> string; + unsigned next = 0; + bool inTextSecurityMode = start.node() && start.node()->renderer() && start.node()->renderer()->style()->textSecurity() != TSNONE; + 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()); + if (next != string.size()) + break; + it.advance(); + } + + if (it.atEnd() && next == string.size()) { + pos = it.range()->startPosition(); + } else if (next != 0) { + // Use the character iterator to translate the next value into a DOM position. + CharacterIterator charIt(searchRange.get(), true); + charIt.advance(next - 1); + pos = charIt.range()->endPosition(); + + // 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(charIt.range()->startPosition())) + pos = visPos.next(true).deepEquivalent(); + } + + // generate VisiblePosition, use UPSTREAM affinity if possible + return VisiblePosition(pos, VP_UPSTREAM_IF_POSSIBLE); +} + +// --------- + +static unsigned startWordBoundary(const UChar* characters, unsigned length) +{ + int start, end; + findWordBoundary(characters, length, length, &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) +{ + int start, end; + findWordBoundary(characters, length, 0, &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) +{ + return findNextWordFromIndex(characters, length, length, false); +} + +VisiblePosition previousWordPosition(const VisiblePosition &c) +{ + VisiblePosition prev = previousBoundary(c, previousWordPositionBoundary); + return c.honorEditableBoundaryAtOrAfter(prev); +} + +static unsigned nextWordPositionBoundary(const UChar* characters, unsigned length) +{ + return findNextWordFromIndex(characters, length, 0, true); +} + +VisiblePosition nextWordPosition(const VisiblePosition &c) +{ + VisiblePosition next = nextBoundary(c, nextWordPositionBoundary); + return c.honorEditableBoundaryAtOrBefore(next); +} + +// --------- + +static RootInlineBox *rootBoxForLine(const VisiblePosition &c) +{ + Position p = c.deepEquivalent(); + Node *node = p.node(); + if (!node) + return 0; + + RenderObject *renderer = node->renderer(); + if (!renderer) + return 0; + + InlineBox *box = renderer->inlineBox(p.offset(), c.affinity()); + if (!box) + return 0; + + return box->root(); +} + +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)) + 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.node()->renderer() && p.node()->renderer()->isRenderBlock() && p.offset() == 0) + 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->object(); + if (!startRenderer) + return VisiblePosition(); + + startNode = startRenderer->element(); + if (startNode) + break; + + startBox = startBox->nextLeafChild(); + } + + int startOffset = 0; + if (startBox->isInlineTextBox()) { + InlineTextBox *startTextBox = static_cast<InlineTextBox *>(startBox); + startOffset = startTextBox->m_start; + } + + VisiblePosition visPos = VisiblePosition(startNode, startOffset, DOWNSTREAM); + return positionAvoidingFirstPositionInTable(visPos); +} + +VisiblePosition startOfLine(const VisiblePosition& c) +{ + VisiblePosition visPos = startPositionForLine(c); + + if (visPos.isNotNull()) { + // Make sure the start of line is not greater than the given input position. Else use the previous position to + // obtain start 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, startPositionForLine would incorrectly hand back a position + // greater than the input position. 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. + Position p = visPos.deepEquivalent(); + if (p.offset() > c.deepEquivalent().offset() && p.node()->isSameNode(c.deepEquivalent().node())) { + visPos = c.previous(); + if (visPos.isNull()) + return VisiblePosition(); + visPos = startPositionForLine(visPos); + } + } + + return c.honorEditableBoundaryAtOrAfter(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.node()->renderer() && p.node()->renderer()->isRenderBlock() && p.offset() == 0) + 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->object(); + if (!endRenderer) + return VisiblePosition(); + + endNode = endRenderer->element(); + if (endNode) + break; + + endBox = endBox->prevLeafChild(); + } + + int endOffset = 1; + if (endNode->hasTagName(brTag)) { + endOffset = 0; + } else if (endBox->isInlineTextBox()) { + InlineTextBox *endTextBox = static_cast<InlineTextBox *>(endBox); + endOffset = endTextBox->m_start; + if (!endTextBox->isLineBreak()) + endOffset += endTextBox->m_len; + } + + return VisiblePosition(endNode, endOffset, 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.honorEditableBoundaryAtOrBefore(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); +} + +VisiblePosition previousLinePosition(const VisiblePosition &visiblePosition, int x) +{ + Position p = visiblePosition.deepEquivalent(); + Node *node = p.node(); + 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 = renderer->inlineBox(p.offset(), visiblePosition.affinity()); + if (box) { + root = box->root()->prevRootBox(); + if (root) + containingBlock = renderer->containingBlock(); + } + + 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 = enclosingBlock(node); + Node *n = node->previousEditable(); + while (n && startBlock == enclosingBlock(n)) + n = n->previousEditable(); + while (n) { + if (highestEditableRoot(Position(n, 0)) != highestRoot) + break; + Position pos(n, caretMinOffset(n)); + if (pos.isCandidate()) { + ASSERT(n->renderer()); + box = n->renderer()->inlineBox(caretMaxOffset(n)); + if (box) { + // previous root line box found + root = box->root(); + containingBlock = n->renderer()->containingBlock(); + break; + } + + return VisiblePosition(pos, DOWNSTREAM); + } + n = n->previousEditable(); + } + } + + if (root) { + // FIXME: Can be wrong for multi-column layout. + int absx, absy; + containingBlock->absolutePositionForContent(absx, absy); + if (containingBlock->hasOverflowClip()) + containingBlock->layer()->subtractScrollOffset(absx, absy); + RenderObject *renderer = root->closestLeafChildForXPos(x - absx, isEditablePosition(p))->object(); + Node* node = renderer->element(); + if (editingIgnoresContent(node)) + return Position(node->parent(), node->nodeIndex()); + return renderer->positionForCoordinates(x - absx, root->topOverflow()); + } + + // 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. + return VisiblePosition(node->rootEditableElement(), 0, DOWNSTREAM); +} + +VisiblePosition nextLinePosition(const VisiblePosition &visiblePosition, int x) +{ + Position p = visiblePosition.deepEquivalent(); + Node *node = p.node(); + 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 = renderer->inlineBox(p.offset(), visiblePosition.affinity()); + if (box) { + root = box->root()->nextRootBox(); + if (root) + containingBlock = renderer->containingBlock(); + } + + 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 = enclosingBlock(node); + Node *n = node->nextEditable(p.offset()); + while (n && startBlock == enclosingBlock(n)) + n = n->nextEditable(); + while (n) { + if (highestEditableRoot(Position(n, 0)) != highestRoot) + break; + Position pos(n, caretMinOffset(n)); + if (pos.isCandidate()) { + ASSERT(n->renderer()); + box = n->renderer()->inlineBox(caretMinOffset(n)); + if (box) { + // next root line box found + root = box->root(); + containingBlock = n->renderer()->containingBlock(); + break; + } + + return VisiblePosition(pos, DOWNSTREAM); + } + n = n->nextEditable(); + } + } + + if (root) { + // FIXME: Can be wrong for multi-column layout. + int absx, absy; + containingBlock->absolutePositionForContent(absx, absy); + if (containingBlock->hasOverflowClip()) + containingBlock->layer()->subtractScrollOffset(absx, absy); + RenderObject *renderer = root->closestLeafChildForXPos(x - absx, isEditablePosition(p))->object(); + Node* node = renderer->element(); + if (editingIgnoresContent(node)) + return Position(node->parent(), node->nodeIndex()); + return renderer->positionForCoordinates(x - absx, root->topOverflow()); + } + + // 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->rootEditableElement(); + return VisiblePosition(rootElement, rootElement ? rootElement->childNodeCount() : 0, DOWNSTREAM); +} + +// --------- + +static unsigned startSentenceBoundary(const UChar* characters, unsigned length) +{ + 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) +{ + 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) +{ + // 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.honorEditableBoundaryAtOrAfter(prev); +} + +static unsigned nextSentencePositionBoundary(const UChar* characters, unsigned length) +{ + // 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.honorEditableBoundaryAtOrBefore(next); +} + +// FIXME: Broken for positions before/after images that aren't inline (5027702) +VisiblePosition startOfParagraph(const VisiblePosition &c) +{ + Position p = c.deepEquivalent(); + Node *startNode = p.node(); + + if (!startNode) + return VisiblePosition(); + + if (startNode->renderer() + && ((startNode->renderer()->isTable() && !startNode->renderer()->isInline()) + || startNode->renderer()->isHR()) + && p.offset() == maxDeepOffset(startNode)) + return VisiblePosition(Position(startNode, 0)); + + Node* startBlock = enclosingBlock(startNode); + + Node *node = startNode; + int offset = p.offset(); + + Node *n = startNode; + while (n) { + if (n->isContentEditable() != startNode->isContentEditable()) + 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()) { + if (style->preserveNewline()) { + const UChar* chars = static_cast<RenderText*>(r)->characters(); + int i = static_cast<RenderText*>(r)->textLength(); + int o = offset; + if (n == startNode && o < i) + i = max(0, o); + while (--i >= 0) + if (chars[i] == '\n') + return VisiblePosition(n, i + 1, DOWNSTREAM); + } + node = n; + offset = 0; + n = n->traversePreviousNodePostOrder(startBlock); + } else if (editingIgnoresContent(n) || isTableElement(n)) { + node = n; + offset = 0; + n = n->previousSibling() ? n->previousSibling() : n->traversePreviousNodePostOrder(startBlock); + } else + n = n->traversePreviousNodePostOrder(startBlock); + } + + return VisiblePosition(node, offset, DOWNSTREAM); +} + +// FIXME: Broken for positions before/after images that aren't inline (5027702) +VisiblePosition endOfParagraph(const VisiblePosition &c) +{ + if (c.isNull()) + return VisiblePosition(); + + Position p = c.deepEquivalent(); + Node* startNode = p.node(); + + if (startNode->renderer() + && ((startNode->renderer()->isTable() && !startNode->renderer()->isInline()) + || startNode->renderer()->isHR()) + && p.offset() == 0) + return VisiblePosition(Position(startNode, maxDeepOffset(startNode))); + + Node* startBlock = enclosingBlock(startNode); + Node *stayInsideBlock = startBlock; + + Node *node = startNode; + int offset = p.offset(); + + Node *n = startNode; + while (n) { + if (n->isContentEditable() != startNode->isContentEditable()) + 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. + // We should probably do this in other cases such as startOfParagraph. + if (r->isText() && r->caretMaxRenderedOffset() > 0) { + int length = static_cast<RenderText*>(r)->textLength(); + if (style->preserveNewline()) { + const UChar* chars = static_cast<RenderText*>(r)->characters(); + int o = n == startNode ? offset : 0; + for (int i = o; i < length; ++i) + if (chars[i] == '\n') + return VisiblePosition(n, i, DOWNSTREAM); + } + node = n; + offset = r->caretMaxOffset(); + n = n->traverseNextNode(stayInsideBlock); + } else if (editingIgnoresContent(n) || isTableElement(n)) { + node = n; + offset = maxDeepOffset(n); + n = n->traverseNextSibling(stayInsideBlock); + } else + n = n->traverseNextNode(stayInsideBlock); + } + + return VisiblePosition(node, offset, DOWNSTREAM); +} + +VisiblePosition startOfNextParagraph(const VisiblePosition& visiblePosition) +{ + VisiblePosition paragraphEnd(endOfParagraph(visiblePosition)); + VisiblePosition afterParagraphEnd(paragraphEnd.next(true)); + // 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(true); + return afterParagraphEnd; +} + +bool inSameParagraph(const VisiblePosition &a, const VisiblePosition &b) +{ + return a.isNotNull() && startOfParagraph(a) == startOfParagraph(b); +} + +bool isStartOfParagraph(const VisiblePosition &pos) +{ + return pos.isNotNull() && pos == startOfParagraph(pos); +} + +bool isEndOfParagraph(const VisiblePosition &pos) +{ + return pos.isNotNull() && pos == endOfParagraph(pos); +} + +VisiblePosition previousParagraphPosition(const VisiblePosition &p, int x) +{ + VisiblePosition pos = p; + do { + VisiblePosition n = previousLinePosition(pos, x); + if (n.isNull() || n == pos) + return p; + 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) + return p; + pos = n; + } while (inSameParagraph(p, pos)); + return pos; +} + +// --------- + +VisiblePosition startOfBlock(const VisiblePosition &c) +{ + Position p = c.deepEquivalent(); + Node *startNode = p.node(); + if (!startNode) + return VisiblePosition(); + return VisiblePosition(Position(startNode->enclosingBlockFlowElement(), 0), DOWNSTREAM); +} + +VisiblePosition endOfBlock(const VisiblePosition &c) +{ + Position p = c.deepEquivalent(); + + Node *startNode = p.node(); + if (!startNode) + return VisiblePosition(); + + Node *startBlock = startNode->enclosingBlockFlowElement(); + + return VisiblePosition(startBlock, startBlock->childNodeCount(), VP_DEFAULT_AFFINITY); +} + +bool inSameBlock(const VisiblePosition &a, const VisiblePosition &b) +{ + return !a.isNull() && enclosingBlockFlowElement(a) == enclosingBlockFlowElement(b); +} + +bool isStartOfBlock(const VisiblePosition &pos) +{ + return pos.isNotNull() && pos == startOfBlock(pos); +} + +bool isEndOfBlock(const VisiblePosition &pos) +{ + return pos.isNotNull() && pos == endOfBlock(pos); +} + +// --------- + +VisiblePosition startOfDocument(const Node* node) +{ + if (!node) + return VisiblePosition(); + + return VisiblePosition(node->document()->documentElement(), 0, DOWNSTREAM); +} + +VisiblePosition startOfDocument(const VisiblePosition &c) +{ + return startOfDocument(c.deepEquivalent().node()); +} + +VisiblePosition endOfDocument(const Node* node) +{ + if (!node || !node->document()) + return VisiblePosition(); + + Element* doc = node->document()->documentElement(); + return VisiblePosition(doc, doc->childNodeCount(), DOWNSTREAM); +} + +VisiblePosition endOfDocument(const VisiblePosition &c) +{ + return endOfDocument(c.deepEquivalent().node()); +} + +bool inSameDocument(const VisiblePosition &a, const VisiblePosition &b) +{ + Position ap = a.deepEquivalent(); + Node *an = ap.node(); + if (!an) + return false; + Position bp = b.deepEquivalent(); + Node *bn = bp.node(); + 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 VisiblePosition(highestRoot, 0, DOWNSTREAM); +} + +VisiblePosition endOfEditableContent(const VisiblePosition& visiblePosition) +{ + Node* highestRoot = highestEditableRoot(visiblePosition.deepEquivalent()); + if (!highestRoot) + return VisiblePosition(); + + return VisiblePosition(highestRoot, maxDeepOffset(highestRoot), DOWNSTREAM); +} + +} |