/
Position.cpp
1427 lines (1211 loc) · 50.9 KB
/
Position.cpp
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/*
* Copyright (C) 2004, 2005, 2006, 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 "Position.h"
#include "CSSComputedStyleDeclaration.h"
#include "HTMLNames.h"
#include "InlineIterator.h"
#include "InlineTextBox.h"
#include "Logging.h"
#include "PositionIterator.h"
#include "RenderBlock.h"
#include "RenderInline.h"
#include "RenderText.h"
#include "RuntimeEnabledFeatures.h"
#include "Text.h"
#include "TextIterator.h"
#include "VisiblePosition.h"
#include "VisibleUnits.h"
#include "htmlediting.h"
#include <stdio.h>
#include <wtf/text/CString.h>
#include <wtf/unicode/CharacterNames.h>
namespace WebCore {
using namespace HTMLNames;
static Node* nextRenderedEditable(Node* node)
{
while ((node = node->nextLeafNode())) {
if (!node->rendererIsEditable())
continue;
RenderObject* renderer = node->renderer();
if (!renderer)
continue;
if ((renderer->isBox() && toRenderBox(renderer)->inlineBoxWrapper()) || (renderer->isText() && toRenderText(renderer)->firstTextBox()))
return node;
}
return 0;
}
static Node* previousRenderedEditable(Node* node)
{
while ((node = node->previousLeafNode())) {
if (!node->rendererIsEditable())
continue;
RenderObject* renderer = node->renderer();
if (!renderer)
continue;
if ((renderer->isBox() && toRenderBox(renderer)->inlineBoxWrapper()) || (renderer->isText() && toRenderText(renderer)->firstTextBox()))
return node;
}
return 0;
}
Position::Position(PassRefPtr<Node> anchorNode, LegacyEditingOffset offset)
: m_anchorNode(anchorNode)
, m_offset(offset.value())
, m_anchorType(anchorTypeForLegacyEditingPosition(m_anchorNode.get(), m_offset))
, m_isLegacyEditingPosition(true)
{
#if ENABLE(SHADOW_DOM)
ASSERT((m_anchorNode && RuntimeEnabledFeatures::shadowDOMEnabled())
|| !m_anchorNode || !m_anchorNode->isShadowRoot());
#else
ASSERT(!m_anchorNode || !m_anchorNode->isShadowRoot());
#endif
ASSERT(!m_anchorNode || !m_anchorNode->isPseudoElement());
}
Position::Position(PassRefPtr<Node> anchorNode, AnchorType anchorType)
: m_anchorNode(anchorNode)
, m_offset(0)
, m_anchorType(anchorType)
, m_isLegacyEditingPosition(false)
{
#if ENABLE(SHADOW_DOM)
ASSERT((m_anchorNode && RuntimeEnabledFeatures::shadowDOMEnabled())
|| !m_anchorNode || !m_anchorNode->isShadowRoot());
#else
ASSERT(!m_anchorNode || !m_anchorNode->isShadowRoot());
#endif
ASSERT(!m_anchorNode || !m_anchorNode->isPseudoElement());
ASSERT(anchorType != PositionIsOffsetInAnchor);
ASSERT(!((anchorType == PositionIsBeforeChildren || anchorType == PositionIsAfterChildren)
&& (m_anchorNode->isTextNode() || editingIgnoresContent(m_anchorNode.get()))));
}
Position::Position(PassRefPtr<Node> anchorNode, int offset, AnchorType anchorType)
: m_anchorNode(anchorNode)
, m_offset(offset)
, m_anchorType(anchorType)
, m_isLegacyEditingPosition(false)
{
#if ENABLE(SHADOW_DOM)
ASSERT((m_anchorNode && RuntimeEnabledFeatures::shadowDOMEnabled())
|| !m_anchorNode || !editingIgnoresContent(m_anchorNode.get()) || !m_anchorNode->isShadowRoot());
#else
ASSERT(!m_anchorNode || !editingIgnoresContent(m_anchorNode.get()) || !m_anchorNode->isShadowRoot());
#endif
ASSERT(!m_anchorNode || !m_anchorNode->isPseudoElement());
ASSERT(anchorType == PositionIsOffsetInAnchor);
}
Position::Position(PassRefPtr<Text> textNode, unsigned offset)
: m_anchorNode(textNode)
, m_offset(static_cast<int>(offset))
, m_anchorType(PositionIsOffsetInAnchor)
, m_isLegacyEditingPosition(false)
{
ASSERT(m_anchorNode);
}
void Position::moveToPosition(PassRefPtr<Node> node, int offset)
{
ASSERT(!editingIgnoresContent(node.get()));
ASSERT(anchorType() == PositionIsOffsetInAnchor || m_isLegacyEditingPosition);
m_anchorNode = node;
m_offset = offset;
if (m_isLegacyEditingPosition)
m_anchorType = anchorTypeForLegacyEditingPosition(m_anchorNode.get(), m_offset);
}
void Position::moveToOffset(int offset)
{
ASSERT(anchorType() == PositionIsOffsetInAnchor || m_isLegacyEditingPosition);
m_offset = offset;
if (m_isLegacyEditingPosition)
m_anchorType = anchorTypeForLegacyEditingPosition(m_anchorNode.get(), m_offset);
}
Node* Position::containerNode() const
{
if (!m_anchorNode)
return 0;
switch (anchorType()) {
case PositionIsBeforeChildren:
case PositionIsAfterChildren:
case PositionIsOffsetInAnchor:
return m_anchorNode.get();
case PositionIsBeforeAnchor:
case PositionIsAfterAnchor:
return findParent(m_anchorNode.get());
}
ASSERT_NOT_REACHED();
return 0;
}
Text* Position::containerText() const
{
switch (anchorType()) {
case PositionIsOffsetInAnchor:
return m_anchorNode && m_anchorNode->isTextNode() ? toText(m_anchorNode.get()) : 0;
case PositionIsBeforeAnchor:
case PositionIsAfterAnchor:
return 0;
case PositionIsBeforeChildren:
case PositionIsAfterChildren:
ASSERT(!m_anchorNode || !m_anchorNode->isTextNode());
return 0;
}
ASSERT_NOT_REACHED();
return 0;
}
int Position::computeOffsetInContainerNode() const
{
if (!m_anchorNode)
return 0;
switch (anchorType()) {
case PositionIsBeforeChildren:
return 0;
case PositionIsAfterChildren:
return lastOffsetInNode(m_anchorNode.get());
case PositionIsOffsetInAnchor:
return minOffsetForNode(m_anchorNode.get(), m_offset);
case PositionIsBeforeAnchor:
return m_anchorNode->nodeIndex();
case PositionIsAfterAnchor:
return m_anchorNode->nodeIndex() + 1;
}
ASSERT_NOT_REACHED();
return 0;
}
int Position::offsetForPositionAfterAnchor() const
{
ASSERT(m_anchorType == PositionIsAfterAnchor || m_anchorType == PositionIsAfterChildren);
ASSERT(!m_isLegacyEditingPosition);
return lastOffsetForEditing(m_anchorNode.get());
}
// Neighbor-anchored positions are invalid DOM positions, so they need to be
// fixed up before handing them off to the Range object.
Position Position::parentAnchoredEquivalent() const
{
if (!m_anchorNode)
return Position();
// FIXME: This should only be necessary for legacy positions, but is also needed for positions before and after Tables
if (m_offset <= 0 && (m_anchorType != PositionIsAfterAnchor && m_anchorType != PositionIsAfterChildren)) {
if (findParent(m_anchorNode.get()) && (editingIgnoresContent(m_anchorNode.get()) || isTableElement(m_anchorNode.get())))
return positionInParentBeforeNode(m_anchorNode.get());
return Position(m_anchorNode.get(), 0, PositionIsOffsetInAnchor);
}
if (!m_anchorNode->offsetInCharacters()
&& (m_anchorType == PositionIsAfterAnchor || m_anchorType == PositionIsAfterChildren || static_cast<unsigned>(m_offset) == m_anchorNode->childNodeCount())
&& (editingIgnoresContent(m_anchorNode.get()) || isTableElement(m_anchorNode.get()))
&& containerNode()) {
return positionInParentAfterNode(m_anchorNode.get());
}
return Position(containerNode(), computeOffsetInContainerNode(), PositionIsOffsetInAnchor);
}
Node* Position::computeNodeBeforePosition() const
{
if (!m_anchorNode)
return 0;
switch (anchorType()) {
case PositionIsBeforeChildren:
return 0;
case PositionIsAfterChildren:
return m_anchorNode->lastChild();
case PositionIsOffsetInAnchor:
return m_anchorNode->childNode(m_offset - 1); // -1 converts to childNode((unsigned)-1) and returns null.
case PositionIsBeforeAnchor:
return m_anchorNode->previousSibling();
case PositionIsAfterAnchor:
return m_anchorNode.get();
}
ASSERT_NOT_REACHED();
return 0;
}
Node* Position::computeNodeAfterPosition() const
{
if (!m_anchorNode)
return 0;
switch (anchorType()) {
case PositionIsBeforeChildren:
return m_anchorNode->firstChild();
case PositionIsAfterChildren:
return 0;
case PositionIsOffsetInAnchor:
return m_anchorNode->childNode(m_offset);
case PositionIsBeforeAnchor:
return m_anchorNode.get();
case PositionIsAfterAnchor:
return m_anchorNode->nextSibling();
}
ASSERT_NOT_REACHED();
return 0;
}
Position::AnchorType Position::anchorTypeForLegacyEditingPosition(Node* anchorNode, int offset)
{
if (anchorNode && editingIgnoresContent(anchorNode)) {
if (offset == 0)
return Position::PositionIsBeforeAnchor;
return Position::PositionIsAfterAnchor;
}
return Position::PositionIsOffsetInAnchor;
}
// FIXME: This method is confusing (does it return anchorNode() or containerNode()?) and should be renamed or removed
Element* Position::element() const
{
Node* n = anchorNode();
while (n && !n->isElementNode())
n = n->parentNode();
return static_cast<Element*>(n);
}
PassRefPtr<CSSComputedStyleDeclaration> Position::computedStyle() const
{
Element* elem = element();
if (!elem)
return 0;
return CSSComputedStyleDeclaration::create(elem);
}
Position Position::previous(PositionMoveType moveType) const
{
Node* n = deprecatedNode();
if (!n)
return *this;
int o = deprecatedEditingOffset();
// FIXME: Negative offsets shouldn't be allowed. We should catch this earlier.
ASSERT(o >= 0);
if (o > 0) {
Node* child = n->childNode(o - 1);
if (child)
return lastPositionInOrAfterNode(child);
// There are two reasons child might be 0:
// 1) The node is node like a text node that is not an element, and therefore has no children.
// Going backward one character at a time is correct.
// 2) The old offset was a bogus offset like (<br>, 1), and there is no child.
// Going from 1 to 0 is correct.
switch (moveType) {
case CodePoint:
return createLegacyEditingPosition(n, o - 1);
case Character:
return createLegacyEditingPosition(n, uncheckedPreviousOffset(n, o));
case BackwardDeletion:
return createLegacyEditingPosition(n, uncheckedPreviousOffsetForBackwardDeletion(n, o));
}
}
ContainerNode* parent = findParent(n);
if (!parent)
return *this;
return createLegacyEditingPosition(parent, n->nodeIndex());
}
Position Position::next(PositionMoveType moveType) const
{
ASSERT(moveType != BackwardDeletion);
Node* n = deprecatedNode();
if (!n)
return *this;
int o = deprecatedEditingOffset();
// FIXME: Negative offsets shouldn't be allowed. We should catch this earlier.
ASSERT(o >= 0);
Node* child = n->childNode(o);
if (child || (!n->hasChildNodes() && o < lastOffsetForEditing(n))) {
if (child)
return firstPositionInOrBeforeNode(child);
// There are two reasons child might be 0:
// 1) The node is node like a text node that is not an element, and therefore has no children.
// Going forward one character at a time is correct.
// 2) The new offset is a bogus offset like (<br>, 1), and there is no child.
// Going from 0 to 1 is correct.
return createLegacyEditingPosition(n, (moveType == Character) ? uncheckedNextOffset(n, o) : o + 1);
}
ContainerNode* parent = findParent(n);
if (!parent)
return *this;
return createLegacyEditingPosition(parent, n->nodeIndex() + 1);
}
int Position::uncheckedPreviousOffset(const Node* n, int current)
{
return n->renderer() ? n->renderer()->previousOffset(current) : current - 1;
}
int Position::uncheckedPreviousOffsetForBackwardDeletion(const Node* n, int current)
{
return n->renderer() ? n->renderer()->previousOffsetForBackwardDeletion(current) : current - 1;
}
int Position::uncheckedNextOffset(const Node* n, int current)
{
return n->renderer() ? n->renderer()->nextOffset(current) : current + 1;
}
bool Position::atFirstEditingPositionForNode() const
{
if (isNull())
return true;
// FIXME: Position before anchor shouldn't be considered as at the first editing position for node
// since that position resides outside of the node.
switch (m_anchorType) {
case PositionIsOffsetInAnchor:
return m_offset <= 0;
case PositionIsBeforeChildren:
case PositionIsBeforeAnchor:
return true;
case PositionIsAfterChildren:
case PositionIsAfterAnchor:
return !lastOffsetForEditing(deprecatedNode());
}
ASSERT_NOT_REACHED();
return false;
}
bool Position::atLastEditingPositionForNode() const
{
if (isNull())
return true;
// FIXME: Position after anchor shouldn't be considered as at the first editing position for node
// since that position resides outside of the node.
return m_anchorType == PositionIsAfterAnchor || m_anchorType == PositionIsAfterChildren || m_offset >= lastOffsetForEditing(deprecatedNode());
}
// A position is considered at editing boundary if one of the following is true:
// 1. It is the first position in the node and the next visually equivalent position
// is non editable.
// 2. It is the last position in the node and the previous visually equivalent position
// is non editable.
// 3. It is an editable position and both the next and previous visually equivalent
// positions are both non editable.
bool Position::atEditingBoundary() const
{
Position nextPosition = downstream(CanCrossEditingBoundary);
if (atFirstEditingPositionForNode() && nextPosition.isNotNull() && !nextPosition.deprecatedNode()->rendererIsEditable())
return true;
Position prevPosition = upstream(CanCrossEditingBoundary);
if (atLastEditingPositionForNode() && prevPosition.isNotNull() && !prevPosition.deprecatedNode()->rendererIsEditable())
return true;
return nextPosition.isNotNull() && !nextPosition.deprecatedNode()->rendererIsEditable()
&& prevPosition.isNotNull() && !prevPosition.deprecatedNode()->rendererIsEditable();
}
Node* Position::parentEditingBoundary() const
{
if (!m_anchorNode || !m_anchorNode->document())
return 0;
Node* documentElement = m_anchorNode->document()->documentElement();
if (!documentElement)
return 0;
Node* boundary = m_anchorNode.get();
while (boundary != documentElement && boundary->nonShadowBoundaryParentNode() && m_anchorNode->rendererIsEditable() == boundary->parentNode()->rendererIsEditable())
boundary = boundary->nonShadowBoundaryParentNode();
return boundary;
}
bool Position::atStartOfTree() const
{
if (isNull())
return true;
return !findParent(deprecatedNode()) && m_offset <= 0;
}
bool Position::atEndOfTree() const
{
if (isNull())
return true;
return !findParent(deprecatedNode()) && m_offset >= lastOffsetForEditing(deprecatedNode());
}
int Position::renderedOffset() const
{
if (!deprecatedNode()->isTextNode())
return m_offset;
if (!deprecatedNode()->renderer())
return m_offset;
int result = 0;
RenderText* textRenderer = toRenderText(deprecatedNode()->renderer());
for (InlineTextBox *box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
int start = box->start();
int end = box->start() + box->len();
if (m_offset < start)
return result;
if (m_offset <= end) {
result += m_offset - start;
return result;
}
result += box->len();
}
return result;
}
// return first preceding DOM position rendered at a different location, or "this"
Position Position::previousCharacterPosition(EAffinity affinity) const
{
if (isNull())
return Position();
Node* fromRootEditableElement = deprecatedNode()->rootEditableElement();
bool atStartOfLine = isStartOfLine(VisiblePosition(*this, affinity));
bool rendered = isCandidate();
Position currentPos = *this;
while (!currentPos.atStartOfTree()) {
currentPos = currentPos.previous();
if (currentPos.deprecatedNode()->rootEditableElement() != fromRootEditableElement)
return *this;
if (atStartOfLine || !rendered) {
if (currentPos.isCandidate())
return currentPos;
} else if (rendersInDifferentPosition(currentPos))
return currentPos;
}
return *this;
}
// return first following position rendered at a different location, or "this"
Position Position::nextCharacterPosition(EAffinity affinity) const
{
if (isNull())
return Position();
Node* fromRootEditableElement = deprecatedNode()->rootEditableElement();
bool atEndOfLine = isEndOfLine(VisiblePosition(*this, affinity));
bool rendered = isCandidate();
Position currentPos = *this;
while (!currentPos.atEndOfTree()) {
currentPos = currentPos.next();
if (currentPos.deprecatedNode()->rootEditableElement() != fromRootEditableElement)
return *this;
if (atEndOfLine || !rendered) {
if (currentPos.isCandidate())
return currentPos;
} else if (rendersInDifferentPosition(currentPos))
return currentPos;
}
return *this;
}
// Whether or not [node, 0] and [node, lastOffsetForEditing(node)] are their own VisiblePositions.
// If true, adjacent candidates are visually distinct.
// FIXME: Disregard nodes with renderers that have no height, as we do in isCandidate.
// FIXME: Share code with isCandidate, if possible.
static bool endsOfNodeAreVisuallyDistinctPositions(Node* node)
{
if (!node || !node->renderer())
return false;
if (!node->renderer()->isInline())
return true;
// Don't include inline tables.
if (node->hasTagName(tableTag))
return false;
// There is a VisiblePosition inside an empty inline-block container.
return node->renderer()->isReplaced() && canHaveChildrenForEditing(node) && toRenderBox(node->renderer())->height() != 0 && !node->firstChild();
}
static Node* enclosingVisualBoundary(Node* node)
{
while (node && !endsOfNodeAreVisuallyDistinctPositions(node))
node = node->parentNode();
return node;
}
// upstream() and downstream() want to return positions that are either in a
// text node or at just before a non-text node. This method checks for that.
static bool isStreamer(const PositionIterator& pos)
{
if (!pos.node())
return true;
if (isAtomicNode(pos.node()))
return true;
return pos.atStartOfNode();
}
// This function and downstream() are used for moving back and forth between visually equivalent candidates.
// For example, for the text node "foo bar" where whitespace is collapsible, there are two candidates
// that map to the VisiblePosition between 'b' and the space. This function will return the left candidate
// and downstream() will return the right one.
// Also, upstream() will return [boundary, 0] for any of the positions from [boundary, 0] to the first candidate
// in boundary, where endsOfNodeAreVisuallyDistinctPositions(boundary) is true.
Position Position::upstream(EditingBoundaryCrossingRule rule) const
{
Node* startNode = deprecatedNode();
if (!startNode)
return Position();
// iterate backward from there, looking for a qualified position
Node* boundary = enclosingVisualBoundary(startNode);
// FIXME: PositionIterator should respect Before and After positions.
PositionIterator lastVisible = m_anchorType == PositionIsAfterAnchor ? createLegacyEditingPosition(m_anchorNode.get(), caretMaxOffset(m_anchorNode.get())) : *this;
PositionIterator currentPos = lastVisible;
bool startEditable = startNode->rendererIsEditable();
Node* lastNode = startNode;
bool boundaryCrossed = false;
for (; !currentPos.atStart(); currentPos.decrement()) {
Node* currentNode = currentPos.node();
// Don't check for an editability change if we haven't moved to a different node,
// to avoid the expense of computing rendererIsEditable().
if (currentNode != lastNode) {
// Don't change editability.
bool currentEditable = currentNode->rendererIsEditable();
if (startEditable != currentEditable) {
if (rule == CannotCrossEditingBoundary)
break;
boundaryCrossed = true;
}
lastNode = currentNode;
}
// If we've moved to a position that is visually distinct, return the last saved position. There
// is code below that terminates early if we're *about* to move to a visually distinct position.
if (endsOfNodeAreVisuallyDistinctPositions(currentNode) && currentNode != boundary)
return lastVisible;
// skip position in unrendered or invisible node
RenderObject* renderer = currentNode->renderer();
if (!renderer || renderer->style()->visibility() != VISIBLE)
continue;
if (rule == CanCrossEditingBoundary && boundaryCrossed) {
lastVisible = currentPos;
break;
}
// track last visible streamer position
if (isStreamer(currentPos))
lastVisible = currentPos;
// Don't move past a position that is visually distinct. We could rely on code above to terminate and
// return lastVisible on the next iteration, but we terminate early to avoid doing a nodeIndex() call.
if (endsOfNodeAreVisuallyDistinctPositions(currentNode) && currentPos.atStartOfNode())
return lastVisible;
// Return position after tables and nodes which have content that can be ignored.
if (editingIgnoresContent(currentNode) || isTableElement(currentNode)) {
if (currentPos.atEndOfNode())
return positionAfterNode(currentNode);
continue;
}
// return current position if it is in rendered text
if (renderer->isText() && toRenderText(renderer)->firstTextBox()) {
if (currentNode != startNode) {
// This assertion fires in layout tests in the case-transform.html test because
// of a mix-up between offsets in the text in the DOM tree with text in the
// render tree which can have a different length due to case transformation.
// Until we resolve that, disable this so we can run the layout tests!
//ASSERT(currentOffset >= renderer->caretMaxOffset());
return createLegacyEditingPosition(currentNode, renderer->caretMaxOffset());
}
unsigned textOffset = currentPos.offsetInLeafNode();
RenderText* textRenderer = toRenderText(renderer);
InlineTextBox* lastTextBox = textRenderer->lastTextBox();
for (InlineTextBox* box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
if (textOffset <= box->start() + box->len()) {
if (textOffset > box->start())
return currentPos;
continue;
}
if (box == lastTextBox || textOffset != box->start() + box->len() + 1)
continue;
// The text continues on the next line only if the last text box is not on this line and
// none of the boxes on this line have a larger start offset.
bool continuesOnNextLine = true;
InlineBox* otherBox = box;
while (continuesOnNextLine) {
otherBox = otherBox->nextLeafChild();
if (!otherBox)
break;
if (otherBox == lastTextBox || (otherBox->renderer() == textRenderer && static_cast<InlineTextBox*>(otherBox)->start() > textOffset))
continuesOnNextLine = false;
}
otherBox = box;
while (continuesOnNextLine) {
otherBox = otherBox->prevLeafChild();
if (!otherBox)
break;
if (otherBox == lastTextBox || (otherBox->renderer() == textRenderer && static_cast<InlineTextBox*>(otherBox)->start() > textOffset))
continuesOnNextLine = false;
}
if (continuesOnNextLine)
return currentPos;
}
}
}
return lastVisible;
}
// This function and upstream() are used for moving back and forth between visually equivalent candidates.
// For example, for the text node "foo bar" where whitespace is collapsible, there are two candidates
// that map to the VisiblePosition between 'b' and the space. This function will return the right candidate
// and upstream() will return the left one.
// Also, downstream() will return the last position in the last atomic node in boundary for all of the positions
// in boundary after the last candidate, where endsOfNodeAreVisuallyDistinctPositions(boundary).
// FIXME: This function should never be called when the line box tree is dirty. See https://bugs.webkit.org/show_bug.cgi?id=97264
Position Position::downstream(EditingBoundaryCrossingRule rule) const
{
Node* startNode = deprecatedNode();
if (!startNode)
return Position();
// iterate forward from there, looking for a qualified position
Node* boundary = enclosingVisualBoundary(startNode);
// FIXME: PositionIterator should respect Before and After positions.
PositionIterator lastVisible = m_anchorType == PositionIsAfterAnchor ? createLegacyEditingPosition(m_anchorNode.get(), caretMaxOffset(m_anchorNode.get())) : *this;
PositionIterator currentPos = lastVisible;
bool startEditable = startNode->rendererIsEditable();
Node* lastNode = startNode;
bool boundaryCrossed = false;
for (; !currentPos.atEnd(); currentPos.increment()) {
Node* currentNode = currentPos.node();
// Don't check for an editability change if we haven't moved to a different node,
// to avoid the expense of computing rendererIsEditable().
if (currentNode != lastNode) {
// Don't change editability.
bool currentEditable = currentNode->rendererIsEditable();
if (startEditable != currentEditable) {
if (rule == CannotCrossEditingBoundary)
break;
boundaryCrossed = true;
}
lastNode = currentNode;
}
// stop before going above the body, up into the head
// return the last visible streamer position
if (currentNode->hasTagName(bodyTag) && currentPos.atEndOfNode())
break;
// Do not move to a visually distinct position.
if (endsOfNodeAreVisuallyDistinctPositions(currentNode) && currentNode != boundary)
return lastVisible;
// Do not move past a visually disinct position.
// Note: The first position after the last in a node whose ends are visually distinct
// positions will be [boundary->parentNode(), originalBlock->nodeIndex() + 1].
if (boundary && boundary->parentNode() == currentNode)
return lastVisible;
// skip position in unrendered or invisible node
RenderObject* renderer = currentNode->renderer();
if (!renderer || renderer->style()->visibility() != VISIBLE)
continue;
if (rule == CanCrossEditingBoundary && boundaryCrossed) {
lastVisible = currentPos;
break;
}
// track last visible streamer position
if (isStreamer(currentPos))
lastVisible = currentPos;
// Return position before tables and nodes which have content that can be ignored.
if (editingIgnoresContent(currentNode) || isTableElement(currentNode)) {
if (currentPos.offsetInLeafNode() <= renderer->caretMinOffset())
return createLegacyEditingPosition(currentNode, renderer->caretMinOffset());
continue;
}
// return current position if it is in rendered text
if (renderer->isText() && toRenderText(renderer)->firstTextBox()) {
if (currentNode != startNode) {
ASSERT(currentPos.atStartOfNode());
return createLegacyEditingPosition(currentNode, renderer->caretMinOffset());
}
unsigned textOffset = currentPos.offsetInLeafNode();
RenderText* textRenderer = toRenderText(renderer);
InlineTextBox* lastTextBox = textRenderer->lastTextBox();
for (InlineTextBox* box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
if (textOffset <= box->end()) {
if (textOffset >= box->start())
return currentPos;
continue;
}
if (box == lastTextBox || textOffset != box->start() + box->len())
continue;
// The text continues on the next line only if the last text box is not on this line and
// none of the boxes on this line have a larger start offset.
bool continuesOnNextLine = true;
InlineBox* otherBox = box;
while (continuesOnNextLine) {
otherBox = otherBox->nextLeafChild();
if (!otherBox)
break;
if (otherBox == lastTextBox || (otherBox->renderer() == textRenderer && static_cast<InlineTextBox*>(otherBox)->start() >= textOffset))
continuesOnNextLine = false;
}
otherBox = box;
while (continuesOnNextLine) {
otherBox = otherBox->prevLeafChild();
if (!otherBox)
break;
if (otherBox == lastTextBox || (otherBox->renderer() == textRenderer && static_cast<InlineTextBox*>(otherBox)->start() >= textOffset))
continuesOnNextLine = false;
}
if (continuesOnNextLine)
return currentPos;
}
}
}
return lastVisible;
}
static int boundingBoxLogicalHeight(RenderObject *o, const IntRect &rect)
{
return o->style()->isHorizontalWritingMode() ? rect.height() : rect.width();
}
bool Position::hasRenderedNonAnonymousDescendantsWithHeight(RenderObject* renderer)
{
RenderObject* stop = renderer->nextInPreOrderAfterChildren();
for (RenderObject *o = renderer->firstChild(); o && o != stop; o = o->nextInPreOrder())
if (o->nonPseudoNode()) {
if ((o->isText() && boundingBoxLogicalHeight(o, toRenderText(o)->linesBoundingBox()))
|| (o->isBox() && toRenderBox(o)->pixelSnappedLogicalHeight())
|| (o->isRenderInline() && isEmptyInline(o) && boundingBoxLogicalHeight(o, toRenderInline(o)->linesBoundingBox())))
return true;
}
return false;
}
bool Position::nodeIsUserSelectNone(Node* node)
{
return node && node->renderer() && node->renderer()->style()->userSelect() == SELECT_NONE;
}
ContainerNode* Position::findParent(const Node* node)
{
// FIXME: See http://web.ug/82697
#if ENABLE(SHADOW_DOM)
if (RuntimeEnabledFeatures::shadowDOMEnabled())
return node->parentNode();
#endif
return node->nonShadowBoundaryParentNode();
}
#if ENABLE(USERSELECT_ALL)
bool Position::nodeIsUserSelectAll(const Node* node)
{
return node && node->renderer() && node->renderer()->style()->userSelect() == SELECT_ALL;
}
Node* Position::rootUserSelectAllForNode(Node* node)
{
if (!node || !nodeIsUserSelectAll(node))
return 0;
Node* parent = node->parentNode();
if (!parent)
return node;
Node* candidateRoot = node;
while (parent) {
if (!parent->renderer()) {
parent = parent->parentNode();
continue;
}
if (!nodeIsUserSelectAll(parent))
break;
candidateRoot = parent;
parent = candidateRoot->parentNode();
}
return candidateRoot;
}
#endif
bool Position::isCandidate() const
{
if (isNull())
return false;
RenderObject* renderer = deprecatedNode()->renderer();
if (!renderer)
return false;
if (renderer->style()->visibility() != VISIBLE)
return false;
if (renderer->isBR())
// FIXME: The condition should be m_anchorType == PositionIsBeforeAnchor, but for now we still need to support legacy positions.
return !m_offset && m_anchorType != PositionIsAfterAnchor && !nodeIsUserSelectNone(deprecatedNode()->parentNode());
if (renderer->isText())
return !nodeIsUserSelectNone(deprecatedNode()) && inRenderedText();
if (isTableElement(deprecatedNode()) || editingIgnoresContent(deprecatedNode()))
return (atFirstEditingPositionForNode() || atLastEditingPositionForNode()) && !nodeIsUserSelectNone(deprecatedNode()->parentNode());
if (m_anchorNode->hasTagName(htmlTag))
return false;
if (renderer->isBlockFlow()) {
if (toRenderBlock(renderer)->logicalHeight() || m_anchorNode->hasTagName(bodyTag)) {
if (!Position::hasRenderedNonAnonymousDescendantsWithHeight(renderer))
return atFirstEditingPositionForNode() && !Position::nodeIsUserSelectNone(deprecatedNode());
return m_anchorNode->rendererIsEditable() && !Position::nodeIsUserSelectNone(deprecatedNode()) && atEditingBoundary();
}
} else
return m_anchorNode->rendererIsEditable() && !Position::nodeIsUserSelectNone(deprecatedNode()) && atEditingBoundary();
return false;
}
bool Position::inRenderedText() const
{
if (isNull() || !deprecatedNode()->isTextNode())
return false;
RenderObject* renderer = deprecatedNode()->renderer();
if (!renderer)
return false;
RenderText *textRenderer = toRenderText(renderer);
for (InlineTextBox *box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
if (m_offset < static_cast<int>(box->start()) && !textRenderer->containsReversedText()) {
// The offset we're looking for is before this node
// this means the offset must be in content that is
// not rendered. Return false.
return false;
}
if (box->containsCaretOffset(m_offset))
// Return false for offsets inside composed characters.
return m_offset == 0 || m_offset == textRenderer->nextOffset(textRenderer->previousOffset(m_offset));
}
return false;
}
bool Position::isRenderedCharacter() const
{
if (isNull() || !deprecatedNode()->isTextNode())
return false;
RenderObject* renderer = deprecatedNode()->renderer();
if (!renderer)
return false;
RenderText* textRenderer = toRenderText(renderer);
for (InlineTextBox* box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
if (m_offset < static_cast<int>(box->start()) && !textRenderer->containsReversedText()) {
// The offset we're looking for is before this node
// this means the offset must be in content that is
// not rendered. Return false.
return false;
}
if (m_offset >= static_cast<int>(box->start()) && m_offset < static_cast<int>(box->start() + box->len()))
return true;
}
return false;
}
bool Position::rendersInDifferentPosition(const Position &pos) const
{
if (isNull() || pos.isNull())
return false;