| /* |
| * Copyright (C) 2004-2020 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 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 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 "VisibleUnits.h" |
| |
| #include "Document.h" |
| #include "Editing.h" |
| #include "HTMLBRElement.h" |
| #include "HTMLElement.h" |
| #include "HTMLNames.h" |
| #include "InlineIteratorBox.h" |
| #include "InlineIteratorLineBox.h" |
| #include "InlineIteratorLogicalOrderTraversal.h" |
| #include "InlineRunAndOffset.h" |
| #include "NodeTraversal.h" |
| #include "Range.h" |
| #include "RenderBlockFlow.h" |
| #include "RenderObject.h" |
| #include "RenderedPosition.h" |
| #include "Text.h" |
| #include "TextBoundaries.h" |
| #include "TextIterator.h" |
| #include "VisibleSelection.h" |
| #include <unicode/ubrk.h> |
| #include <wtf/text/TextBreakIterator.h> |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| using namespace WTF::Unicode; |
| |
| static Node* previousLeafWithSameEditability(Node* node, EditableType editableType) |
| { |
| bool editable = hasEditableStyle(*node, editableType); |
| node = previousLeafNode(node); |
| while (node) { |
| if (editable == hasEditableStyle(*node, editableType)) |
| return node; |
| node = previousLeafNode(node); |
| } |
| return nullptr; |
| } |
| |
| static Node* nextLeafWithSameEditability(Node* node, EditableType editableType) |
| { |
| if (!node) |
| return nullptr; |
| |
| bool editable = hasEditableStyle(*node, editableType); |
| node = nextLeafNode(node); |
| while (node) { |
| if (editable == hasEditableStyle(*node, editableType)) |
| return node; |
| node = nextLeafNode(node); |
| } |
| return nullptr; |
| } |
| |
| // FIXME: consolidate with code in previousLinePosition. |
| static Position previousLineCandidatePosition(Node* node, const VisiblePosition& visiblePosition, EditableType editableType) |
| { |
| auto* highestRoot = highestEditableRoot(visiblePosition.deepEquivalent(), editableType); |
| Node* previousNode = previousLeafWithSameEditability(node, editableType); |
| |
| while (previousNode && (!previousNode->renderer() || inSameLine(firstPositionInOrBeforeNode(previousNode), visiblePosition))) |
| previousNode = previousLeafWithSameEditability(previousNode, editableType); |
| |
| while (previousNode && !previousNode->isShadowRoot()) { |
| if (highestEditableRoot(firstPositionInOrBeforeNode(previousNode), editableType) != highestRoot) |
| break; |
| |
| Position pos = previousNode->hasTagName(brTag) ? positionBeforeNode(previousNode) : |
| makeDeprecatedLegacyPosition(previousNode, caretMaxOffset(*previousNode)); |
| |
| if (pos.isCandidate()) |
| return pos; |
| |
| previousNode = previousLeafWithSameEditability(previousNode, editableType); |
| } |
| return Position(); |
| } |
| |
| static Position nextLineCandidatePosition(Node* node, const VisiblePosition& visiblePosition, EditableType editableType) |
| { |
| auto* highestRoot = highestEditableRoot(visiblePosition.deepEquivalent(), editableType); |
| Node* nextNode = nextLeafWithSameEditability(node, editableType); |
| while (nextNode && (!nextNode->renderer() || inSameLine(firstPositionInOrBeforeNode(nextNode), visiblePosition))) |
| nextNode = nextLeafWithSameEditability(nextNode, ContentIsEditable); |
| |
| while (nextNode && !nextNode->isShadowRoot()) { |
| if (highestEditableRoot(firstPositionInOrBeforeNode(nextNode), editableType) != highestRoot) |
| break; |
| |
| Position pos; |
| pos = makeDeprecatedLegacyPosition(nextNode, caretMinOffset(*nextNode)); |
| |
| if (pos.isCandidate()) |
| return pos; |
| |
| nextNode = nextLeafWithSameEditability(nextNode, editableType); |
| } |
| return Position(); |
| } |
| |
| static bool isTextOrLineBreakBox(InlineIterator::LeafBoxIterator box) |
| { |
| return box && (box->isText() || box->renderer().isBR()); |
| } |
| |
| static InlineIterator::LeafBoxIterator previousTextOrLineBreakBox(InlineIterator::LeafBoxIterator box, InlineIterator::LineLogicalOrderCache& orderCache) |
| { |
| while (box) { |
| box = InlineIterator::previousLeafOnLineInLogicalOrder(box, orderCache); |
| if (isTextOrLineBreakBox(box)) |
| return box; |
| } |
| return { }; |
| } |
| |
| static InlineIterator::LeafBoxIterator nextTextOrLineBreakBox(InlineIterator::LeafBoxIterator box, InlineIterator::LineLogicalOrderCache& orderCache) |
| { |
| while (box) { |
| box = InlineIterator::nextLeafOnLineInLogicalOrder(box, orderCache); |
| if (isTextOrLineBreakBox(box)) |
| return box; |
| } |
| return { }; |
| } |
| |
| static InlineIterator::LeafBoxIterator startTextOrLineBreakBox(InlineIterator::LineBoxIterator lineBox, InlineIterator::LineLogicalOrderCache& orderCache) |
| { |
| auto box = InlineIterator::firstLeafOnLineInLogicalOrder(lineBox, orderCache); |
| if (isTextOrLineBreakBox(box)) |
| return box; |
| return nextTextOrLineBreakBox(box, orderCache); |
| } |
| |
| static InlineIterator::LeafBoxIterator endTextOrLineBreakBox(InlineIterator::LineBoxIterator lineBox, InlineIterator::LineLogicalOrderCache& orderCache) |
| { |
| auto box = InlineIterator::lastLeafOnLineInLogicalOrder(lineBox, orderCache); |
| if (isTextOrLineBreakBox(box)) |
| return box; |
| return previousTextOrLineBreakBox(box, orderCache); |
| } |
| |
| static const InlineIterator::LeafBoxIterator logicallyPreviousBox(const VisiblePosition& visiblePosition, InlineIterator::LeafBoxIterator startBox, InlineIterator::LineLogicalOrderCache& orderCache, bool& previousBoxInDifferentLine) |
| { |
| if (auto previousBox = previousTextOrLineBreakBox(startBox, orderCache)) |
| return previousBox; |
| |
| if (auto previousLineBox = startBox->lineBox()->previous()) { |
| // FIXME: Why isn't previousBoxInDifferentLine set here? |
| if (auto previousBox = endTextOrLineBreakBox(previousLineBox, orderCache)) |
| return previousBox; |
| } |
| |
| while (1) { |
| auto* startNode = startBox->renderer().nonPseudoNode(); |
| if (!startNode) |
| break; |
| |
| Position position = previousLineCandidatePosition(startNode, visiblePosition, ContentIsEditable); |
| if (position.isNull()) |
| break; |
| |
| RenderedPosition renderedPosition(position, Affinity::Downstream); |
| auto previousLineBox = renderedPosition.lineBox(); |
| if (!previousLineBox) |
| break; |
| |
| if (previousLineBox != startBox->lineBox()) { |
| if (auto previousBox = endTextOrLineBreakBox(previousLineBox, orderCache)) { |
| previousBoxInDifferentLine = true; |
| return previousBox; |
| } |
| } |
| |
| startBox = InlineIterator::firstLeafOnLineInLogicalOrder(previousLineBox, orderCache); |
| } |
| return { }; |
| } |
| |
| |
| static const InlineIterator::LeafBoxIterator logicallyNextBox(const VisiblePosition& visiblePosition, InlineIterator::LeafBoxIterator startBox, InlineIterator::LineLogicalOrderCache& orderCache, bool& nextBoxInDifferentLine) |
| { |
| if (auto nextBox = nextTextOrLineBreakBox(startBox, orderCache)) |
| return nextBox; |
| |
| if (auto nextLineBox = startBox->lineBox()->next()) { |
| // FIXME: Why isn't previousBoxInDifferentLine set here? |
| if (auto nextBox = startTextOrLineBreakBox(nextLineBox, orderCache)) |
| return nextBox; |
| } |
| |
| while (1) { |
| auto* startNode = startBox->renderer().nonPseudoNode(); |
| if (!startNode) |
| break; |
| |
| Position position = nextLineCandidatePosition(startNode, visiblePosition, ContentIsEditable); |
| if (position.isNull()) |
| break; |
| |
| RenderedPosition renderedPosition(position, Affinity::Downstream); |
| auto nextLineBox = renderedPosition.lineBox(); |
| if (!nextLineBox) |
| break; |
| |
| if (nextLineBox != startBox->lineBox()) { |
| if (auto nextBox = startTextOrLineBreakBox(nextLineBox, orderCache)) { |
| nextBoxInDifferentLine = true; |
| return nextBox; |
| } |
| } |
| |
| startBox = InlineIterator::lastLeafOnLineInLogicalOrderWithNode(nextLineBox, orderCache); |
| } |
| return { }; |
| } |
| |
| static UBreakIterator* wordBreakIteratorForMinOffsetBoundary(const VisiblePosition& visiblePosition, InlineIterator::TextBoxIterator textBox, |
| unsigned& previousBoxLength, bool& previousBoxInDifferentLine, Vector<UChar, 1024>& string) |
| { |
| previousBoxInDifferentLine = false; |
| |
| InlineIterator::LineLogicalOrderCache orderCache; |
| auto previousBox = logicallyPreviousBox(visiblePosition, textBox, orderCache, previousBoxInDifferentLine); |
| while (previousBox && !previousBox->isText()) { |
| ASSERT(previousBox->renderer().isBR()); |
| previousBoxInDifferentLine = true; |
| previousBox = logicallyPreviousBox(visiblePosition, previousBox, orderCache, previousBoxInDifferentLine); |
| } |
| |
| string.clear(); |
| |
| if (previousBox) { |
| auto& previousTextBox = downcast<InlineIterator::TextBoxIterator>(previousBox); |
| previousBoxLength = previousTextBox->length(); |
| append(string, previousTextBox->text()); |
| } |
| append(string, textBox->text()); |
| |
| return wordBreakIterator(StringView(string.data(), string.size())); |
| } |
| |
| static UBreakIterator* wordBreakIteratorForMaxOffsetBoundary(const VisiblePosition& visiblePosition, InlineIterator::TextBoxIterator textBox, |
| bool& nextBoxInDifferentLine, Vector<UChar, 1024>& string) |
| { |
| nextBoxInDifferentLine = false; |
| |
| InlineIterator::LineLogicalOrderCache orderCache; |
| auto nextBox = logicallyNextBox(visiblePosition, textBox, orderCache, nextBoxInDifferentLine); |
| while (nextBox && !nextBox->isText()) { |
| ASSERT(nextBox->renderer().isBR()); |
| nextBoxInDifferentLine = true; |
| nextBox = logicallyNextBox(visiblePosition, nextBox, orderCache, nextBoxInDifferentLine); |
| } |
| |
| string.clear(); |
| append(string, textBox->text()); |
| |
| if (nextBox) { |
| auto& nextTextBox = downcast<InlineIterator::TextBoxIterator>(nextBox); |
| append(string, nextTextBox->text()); |
| } |
| |
| return wordBreakIterator(StringView(string.data(), string.size())); |
| } |
| |
| static bool isLogicalStartOfWord(UBreakIterator* iter, int position, bool hardLineBreak) |
| { |
| bool boundary = hardLineBreak ? true : ubrk_isBoundary(iter, position); |
| if (!boundary) |
| return false; |
| |
| ubrk_following(iter, position); |
| // isWordTextBreak returns true after moving across a word and false after moving across a punctuation/space. |
| return isWordTextBreak(iter); |
| } |
| |
| static bool islogicalEndOfWord(UBreakIterator* iter, int position, bool hardLineBreak) |
| { |
| bool boundary = ubrk_isBoundary(iter, position); |
| return (hardLineBreak || boundary) && isWordTextBreak(iter); |
| } |
| |
| enum CursorMovementDirection { MoveLeft, MoveRight }; |
| |
| static VisiblePosition visualWordPosition(const VisiblePosition& visiblePosition, CursorMovementDirection direction, |
| bool skipsSpaceWhenMovingRight) |
| { |
| if (visiblePosition.isNull() || !visiblePosition.deepEquivalent().document()) |
| return VisiblePosition(); |
| |
| visiblePosition.deepEquivalent().document()->updateLayoutIgnorePendingStylesheets(); |
| |
| TextDirection blockDirection = directionOfEnclosingBlock(visiblePosition.deepEquivalent()); |
| InlineIterator::LeafBoxIterator previouslyVisitedBox; |
| VisiblePosition current = visiblePosition; |
| std::optional<VisiblePosition> previousPosition; |
| UBreakIterator* iter = nullptr; |
| |
| Vector<UChar, 1024> string; |
| |
| while (1) { |
| VisiblePosition adjacentCharacterPosition = direction == MoveRight ? current.right(true) : current.left(true); |
| if (adjacentCharacterPosition == current || adjacentCharacterPosition.isNull()) |
| return VisiblePosition(); |
| // FIXME: This is a workaround for webkit.org/b/167138. |
| if (previousPosition && adjacentCharacterPosition == previousPosition.value()) |
| return VisiblePosition(); |
| |
| // FIXME: Why force the use of upstream affinity here instead of VisiblePosition::inlineBoxAndOffset, which will get affinity from adjacentCharacterPosition? |
| auto [box, offsetInBox] = adjacentCharacterPosition.deepEquivalent().inlineBoxAndOffset(Affinity::Upstream); |
| |
| if (!box) |
| break; |
| if (!box->isText()) { |
| current = adjacentCharacterPosition; |
| continue; |
| } |
| |
| auto& textBox = downcast<InlineIterator::TextBoxIterator>(box); |
| unsigned previousBoxLength = 0; |
| bool previousBoxInDifferentLine = false; |
| bool nextBoxInDifferentLine = false; |
| bool movingIntoNewBox = previouslyVisitedBox != box; |
| |
| if (offsetInBox == textBox->minimumCaretOffset()) |
| iter = wordBreakIteratorForMinOffsetBoundary(adjacentCharacterPosition, textBox, previousBoxLength, previousBoxInDifferentLine, string); |
| else if (offsetInBox == textBox->maximumCaretOffset()) |
| iter = wordBreakIteratorForMaxOffsetBoundary(adjacentCharacterPosition, textBox, nextBoxInDifferentLine, string); |
| else if (movingIntoNewBox) { |
| iter = wordBreakIterator(textBox->text()); |
| previouslyVisitedBox = box; |
| } |
| |
| if (!iter) |
| break; |
| |
| ubrk_first(iter); |
| int offsetInIterator = offsetInBox - textBox->start() + previousBoxLength; |
| |
| bool isWordBreak; |
| bool boxHasSameDirectionalityAsBlock = box->direction() == blockDirection; |
| bool movingBackward = (direction == MoveLeft && box->direction() == TextDirection::LTR) || (direction == MoveRight && box->direction() == TextDirection::RTL); |
| if ((skipsSpaceWhenMovingRight && boxHasSameDirectionalityAsBlock) |
| || (!skipsSpaceWhenMovingRight && movingBackward)) { |
| bool logicalStartInRenderer = offsetInBox == textBox->start() && previousBoxInDifferentLine; |
| isWordBreak = isLogicalStartOfWord(iter, offsetInIterator, logicalStartInRenderer); |
| if (isWordBreak && offsetInBox == box->maximumCaretOffset() && nextBoxInDifferentLine) |
| isWordBreak = false; |
| } else { |
| bool logicalEndInRenderer = offsetInBox == textBox->end() && nextBoxInDifferentLine; |
| isWordBreak = islogicalEndOfWord(iter, offsetInIterator, logicalEndInRenderer); |
| if (isWordBreak && offsetInBox == box->minimumCaretOffset() && previousBoxInDifferentLine) |
| isWordBreak = false; |
| } |
| |
| if (isWordBreak) |
| return adjacentCharacterPosition; |
| |
| previousPosition = current; |
| current = adjacentCharacterPosition; |
| } |
| return VisiblePosition(); |
| } |
| |
| VisiblePosition leftWordPosition(const VisiblePosition& visiblePosition, bool skipsSpaceWhenMovingRight) |
| { |
| VisiblePosition leftWordBreak = visualWordPosition(visiblePosition, MoveLeft, skipsSpaceWhenMovingRight); |
| leftWordBreak = visiblePosition.honorEditingBoundaryAtOrBefore(leftWordBreak); |
| |
| // FIXME: How should we handle a non-editable position? |
| if (leftWordBreak.isNull() && isEditablePosition(visiblePosition.deepEquivalent())) { |
| TextDirection blockDirection = directionOfEnclosingBlock(visiblePosition.deepEquivalent()); |
| leftWordBreak = blockDirection == TextDirection::LTR ? startOfEditableContent(visiblePosition) : endOfEditableContent(visiblePosition); |
| } |
| return leftWordBreak; |
| } |
| |
| VisiblePosition rightWordPosition(const VisiblePosition& visiblePosition, bool skipsSpaceWhenMovingRight) |
| { |
| VisiblePosition rightWordBreak = visualWordPosition(visiblePosition, MoveRight, skipsSpaceWhenMovingRight); |
| rightWordBreak = visiblePosition.honorEditingBoundaryAtOrBefore(rightWordBreak); |
| |
| // FIXME: How should we handle a non-editable position? |
| if (rightWordBreak.isNull() && isEditablePosition(visiblePosition.deepEquivalent())) { |
| TextDirection blockDirection = directionOfEnclosingBlock(visiblePosition.deepEquivalent()); |
| rightWordBreak = blockDirection == TextDirection::LTR ? endOfEditableContent(visiblePosition) : startOfEditableContent(visiblePosition); |
| } |
| return rightWordBreak; |
| } |
| |
| |
| static void prepend(Vector<UChar, 1024>& buffer, StringView string) |
| { |
| unsigned oldSize = buffer.size(); |
| unsigned length = string.length(); |
| buffer.grow(oldSize + length); |
| memmove(buffer.data() + length, buffer.data(), oldSize * sizeof(UChar)); |
| for (unsigned i = 0; i < length; ++i) |
| buffer[i] = string[i]; |
| } |
| |
| static void prependRepeatedCharacter(Vector<UChar, 1024>& buffer, UChar character, unsigned count) |
| { |
| unsigned oldSize = buffer.size(); |
| buffer.grow(oldSize + count); |
| memmove(buffer.data() + count, buffer.data(), oldSize * sizeof(UChar)); |
| for (unsigned i = 0; i < count; ++i) |
| buffer[i] = character; |
| } |
| |
| static void appendRepeatedCharacter(Vector<UChar, 1024>& buffer, UChar character, unsigned count) |
| { |
| unsigned oldSize = buffer.size(); |
| buffer.grow(oldSize + count); |
| for (unsigned i = 0; i < count; ++i) |
| buffer[oldSize + i] = character; |
| } |
| |
| unsigned suffixLengthForRange(const SimpleRange& forwardsScanRange, Vector<UChar, 1024>& string) |
| { |
| unsigned suffixLength = 0; |
| TextIterator forwardsIterator(forwardsScanRange); |
| while (!forwardsIterator.atEnd()) { |
| StringView text = forwardsIterator.text(); |
| unsigned i = endOfFirstWordBoundaryContext(text); |
| append(string, text.left(i)); |
| suffixLength += i; |
| if (i < text.length()) |
| break; |
| forwardsIterator.advance(); |
| } |
| return suffixLength; |
| } |
| |
| unsigned prefixLengthForRange(const SimpleRange& backwardsScanRange, Vector<UChar, 1024>& string) |
| { |
| unsigned prefixLength = 0; |
| SimplifiedBackwardsTextIterator backwardsIterator(backwardsScanRange); |
| while (!backwardsIterator.atEnd()) { |
| StringView text = backwardsIterator.text(); |
| int i = startOfLastWordBoundaryContext(text); |
| prepend(string, text.substring(i)); |
| prefixLength += text.length() - i; |
| if (i > 0) |
| break; |
| backwardsIterator.advance(); |
| } |
| return prefixLength; |
| } |
| |
| unsigned backwardSearchForBoundaryWithTextIterator(SimplifiedBackwardsTextIterator& it, Vector<UChar, 1024>& string, unsigned suffixLength, BoundarySearchFunction searchFunction) |
| { |
| unsigned next = 0; |
| bool needMoreContext = false; |
| while (!it.atEnd()) { |
| bool inTextSecurityMode = it.node() && it.node()->renderer() && it.node()->renderer()->style().textSecurity() != TextSecurity::None; |
| // iterate to get chunks until the searchFunction returns a non-zero value. |
| if (!inTextSecurityMode) |
| prepend(string, it.text()); |
| else { |
| // Treat bullets used in the text security mode as regular characters when looking for boundaries |
| prependRepeatedCharacter(string, 'x', it.text().length()); |
| } |
| if (string.size() > suffixLength) { |
| next = searchFunction(StringView(string.data(), string.size()), string.size() - suffixLength, MayHaveMoreContext, needMoreContext); |
| if (next > 1) // FIXME: This is a work around for https://webkit.org/b/115070. We need to provide more contexts in general case. |
| break; |
| } |
| it.advance(); |
| } |
| if (needMoreContext && string.size() > suffixLength) { |
| // 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(StringView(string.data(), string.size()), string.size() - suffixLength, DontHaveMoreContext, needMoreContext); |
| ASSERT(!needMoreContext); |
| } |
| |
| return next; |
| } |
| |
| unsigned forwardSearchForBoundaryWithTextIterator(TextIterator& it, Vector<UChar, 1024>& string, unsigned prefixLength, BoundarySearchFunction searchFunction) |
| { |
| unsigned next = 0; |
| bool needMoreContext = false; |
| while (!it.atEnd()) { |
| bool inTextSecurityMode = it.node() && it.node()->renderer() && it.node()->renderer()->style().textSecurity() != TextSecurity::None; |
| // 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) |
| append(string, it.text()); |
| else { |
| // Treat bullets used in the text security mode as regular characters when looking for boundaries |
| appendRepeatedCharacter(string, 'x', it.text().length()); |
| } |
| if (string.size() > prefixLength) { |
| next = searchFunction(StringView(string.data(), string.size()), prefixLength, MayHaveMoreContext, needMoreContext); |
| if (next != string.size()) |
| break; |
| } |
| it.advance(); |
| } |
| if (needMoreContext && string.size() > prefixLength) { |
| // 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(StringView(string.data(), string.size()), prefixLength, DontHaveMoreContext, needMoreContext); |
| ASSERT(!needMoreContext); |
| } |
| |
| return next; |
| } |
| |
| enum class NeedsContextAtParagraphStart { Yes, No }; |
| static VisiblePosition previousBoundary(const VisiblePosition& position, BoundarySearchFunction searchFunction, |
| NeedsContextAtParagraphStart needsContextAtParagraphStart = NeedsContextAtParagraphStart::No) |
| { |
| auto boundary = position.deepEquivalent().parentEditingBoundary(); |
| if (!boundary) |
| return { }; |
| |
| Vector<UChar, 1024> string; |
| unsigned suffixLength = 0; |
| |
| auto searchRange = makeSimpleRange(makeBoundaryPointBeforeNodeContents(*boundary), position); |
| if (!searchRange) |
| return { }; |
| |
| if (needsContextAtParagraphStart == NeedsContextAtParagraphStart::Yes && isStartOfParagraph(position)) { |
| auto forwardsScanRange = makeSimpleRange(searchRange->start, endOfParagraph(position)); |
| if (!forwardsScanRange) |
| return { }; |
| for (TextIterator forwardsIterator(*forwardsScanRange); !forwardsIterator.atEnd(); forwardsIterator.advance()) |
| append(string, forwardsIterator.text()); |
| suffixLength = string.size(); |
| } else if (requiresContextForWordBoundary(position.characterBefore())) { |
| auto forwardsScanRange = makeSimpleRange(searchRange->end, makeBoundaryPointAfterNodeContents(*boundary)); |
| suffixLength = suffixLengthForRange(forwardsScanRange, string); |
| } |
| |
| SimplifiedBackwardsTextIterator it(*searchRange); |
| unsigned next = backwardSearchForBoundaryWithTextIterator(it, string, suffixLength, searchFunction); |
| |
| if (!next) |
| return it.atEnd() ? makeDeprecatedLegacyPosition(searchRange->start) : position; |
| |
| auto& node = (it.atEnd() ? *searchRange : it.range()).start.container.get(); |
| if ((!suffixLength && is<Text>(node) && next <= downcast<Text>(node).length()) || (node.renderer() && node.renderer()->isBR() && !next)) { |
| // The next variable contains a usable index into a text node. |
| return makeDeprecatedLegacyPosition(&node, next); |
| } |
| |
| // Use the character iterator to translate the next value into a DOM position. |
| BackwardsCharacterIterator charIt(*searchRange); |
| if (next < string.size() - suffixLength) |
| charIt.advance(string.size() - suffixLength - next); |
| // FIXME: charIt can get out of shadow host. |
| return makeDeprecatedLegacyPosition(charIt.range().end); |
| } |
| |
| static VisiblePosition nextBoundary(const VisiblePosition& c, BoundarySearchFunction searchFunction) |
| { |
| Position pos = c.deepEquivalent(); |
| Node* boundary = pos.parentEditingBoundary(); |
| if (!boundary) |
| return VisiblePosition(); |
| |
| Document& boundaryDocument = boundary->document(); |
| |
| Vector<UChar, 1024> string; |
| unsigned prefixLength = 0; |
| |
| if (requiresContextForWordBoundary(c.characterAfter())) { |
| auto backwardsScanRange = makeSimpleRange(makeBoundaryPointBeforeNodeContents(boundaryDocument), c); |
| if (!backwardsScanRange) |
| return { }; |
| prefixLength = prefixLengthForRange(*backwardsScanRange, string); |
| } |
| |
| auto searchRange = makeSimpleRange(c, makeBoundaryPointAfterNodeContents(*boundary)); |
| if (!searchRange) |
| return { }; |
| |
| TextIterator it(*searchRange, TextIteratorBehavior::EmitsCharactersBetweenAllVisiblePositions); |
| unsigned next = forwardSearchForBoundaryWithTextIterator(it, string, prefixLength, searchFunction); |
| |
| if (it.atEnd() && next == string.size()) |
| pos = makeDeprecatedLegacyPosition(searchRange->end); |
| else if (next > prefixLength) { |
| // Use the character iterator to translate the next value into a DOM position. |
| CharacterIterator charIt(*searchRange, TextIteratorBehavior::EmitsCharactersBetweenAllVisiblePositions); |
| charIt.advance(next - prefixLength - 1); |
| if (charIt.atEnd()) |
| return { }; |
| |
| auto characterRange = charIt.range(); |
| pos = makeDeprecatedLegacyPosition(characterRange.end); |
| |
| if (charIt.text()[0] == '\n') { |
| // FIXME: workaround for collapsed range (where only start position is correct) emitted for some emitted newlines (see rdar://5192593) |
| if (VisiblePosition(pos) == VisiblePosition(makeDeprecatedLegacyPosition(characterRange.start))) { |
| charIt.advance(1); |
| pos = makeDeprecatedLegacyPosition(charIt.range().start); |
| } |
| } |
| } |
| |
| return VisiblePosition(pos, Affinity::Upstream); |
| } |
| |
| // --------- |
| |
| unsigned startWordBoundary(StringView text, unsigned offset, BoundarySearchContextAvailability mayHaveMoreContext, bool& needMoreContext) |
| { |
| ASSERT(offset); |
| if (mayHaveMoreContext && !startOfLastWordBoundaryContext(text.left(offset))) { |
| needMoreContext = true; |
| return 0; |
| } |
| needMoreContext = false; |
| int start, end; |
| U16_BACK_1(text, 0, offset); |
| findWordBoundary(text, offset, &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); |
| } |
| |
| unsigned endWordBoundary(StringView text, unsigned offset, BoundarySearchContextAvailability mayHaveMoreContext, bool& needMoreContext) |
| { |
| ASSERT(offset <= text.length()); |
| if (mayHaveMoreContext && endOfFirstWordBoundaryContext(text.substring(offset)) == text.length() - offset) { |
| needMoreContext = true; |
| return text.length(); |
| } |
| needMoreContext = false; |
| int end; |
| findEndWordBoundary(text, offset, &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(StringView text, unsigned offset, BoundarySearchContextAvailability mayHaveMoreContext, bool& needMoreContext) |
| { |
| if (mayHaveMoreContext && !startOfLastWordBoundaryContext(text.left(offset))) { |
| needMoreContext = true; |
| return 0; |
| } |
| needMoreContext = false; |
| return findNextWordFromIndex(text, offset, false); |
| } |
| |
| VisiblePosition previousWordPosition(const VisiblePosition& position) |
| { |
| return position.honorEditingBoundaryAtOrBefore(previousBoundary(position, previousWordPositionBoundary)); |
| } |
| |
| static unsigned nextWordPositionBoundary(StringView text, unsigned offset, BoundarySearchContextAvailability mayHaveMoreContext, bool& needMoreContext) |
| { |
| if (mayHaveMoreContext && endOfFirstWordBoundaryContext(text.substring(offset)) == text.length() - offset) { |
| needMoreContext = true; |
| return text.length(); |
| } |
| needMoreContext = false; |
| return findNextWordFromIndex(text, offset, true); |
| } |
| |
| VisiblePosition nextWordPosition(const VisiblePosition& position) |
| { |
| return position.honorEditingBoundaryAtOrAfter(nextBoundary(position, nextWordPositionBoundary)); |
| } |
| |
| bool isStartOfWord(const VisiblePosition& p) |
| { |
| return p.isNotNull() && p == startOfWord(p, RightWordIfOnBoundary); |
| } |
| |
| // --------- |
| |
| enum LineEndpointComputationMode { UseLogicalOrdering, UseInlineBoxOrdering }; |
| static VisiblePosition startPositionForLine(const VisiblePosition& c, LineEndpointComputationMode mode) |
| { |
| if (c.isNull()) |
| return VisiblePosition(); |
| |
| auto lineBox = RenderedPosition(c).lineBox(); |
| if (!lineBox) { |
| // 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(); |
| } |
| |
| InlineIterator::LineLogicalOrderCache orderCache; |
| |
| Node* startNode = nullptr; |
| auto startBox = mode == UseLogicalOrdering ? InlineIterator::firstLeafOnLineInLogicalOrderWithNode(lineBox, orderCache) : lineBox->firstLeafBox(); |
| // 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. |
| while (true) { |
| if (!startBox) |
| return VisiblePosition(); |
| |
| startNode = startBox->renderer().nonPseudoNode(); |
| if (startNode) |
| break; |
| |
| if (mode == UseLogicalOrdering) |
| startBox = InlineIterator::nextLeafOnLineInLogicalOrder(startBox, orderCache); |
| else |
| startBox.traverseNextOnLine(); |
| } |
| |
| return is<Text>(*startNode) ? Position(downcast<Text>(startNode), downcast<InlineIterator::TextBox>(*startBox).start()) |
| : positionBeforeNode(startNode); |
| } |
| |
| static VisiblePosition startOfLine(const VisiblePosition& c, LineEndpointComputationMode mode, bool* reachedBoundary) |
| { |
| if (reachedBoundary) |
| *reachedBoundary = false; |
| // 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 = startPositionForLine(c, mode); |
| |
| if (mode == UseLogicalOrdering) { |
| if (Node* editableRoot = highestEditableRoot(c.deepEquivalent())) { |
| if (!editableRoot->contains(visPos.deepEquivalent().containerNode())) { |
| VisiblePosition newPosition = firstPositionInNode(editableRoot); |
| if (reachedBoundary) |
| *reachedBoundary = c == newPosition; |
| return newPosition; |
| } |
| } |
| } |
| |
| return c.honorEditingBoundaryAtOrBefore(visPos, reachedBoundary); |
| } |
| |
| // FIXME: Rename this function to reflect the fact it ignores bidi levels. |
| VisiblePosition startOfLine(const VisiblePosition& currentPosition) |
| { |
| return startOfLine(currentPosition, UseInlineBoxOrdering, nullptr); |
| } |
| |
| VisiblePosition logicalStartOfLine(const VisiblePosition& currentPosition, bool* reachedBoundary) |
| { |
| return startOfLine(currentPosition, UseLogicalOrdering, reachedBoundary); |
| } |
| |
| static VisiblePosition endPositionForLine(const VisiblePosition& c, LineEndpointComputationMode mode) |
| { |
| if (c.isNull()) |
| return VisiblePosition(); |
| |
| auto lineBox = RenderedPosition(c).lineBox(); |
| if (!lineBox) { |
| // 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(); |
| } |
| |
| InlineIterator::LineLogicalOrderCache orderCache; |
| |
| Node* endNode = nullptr; |
| auto endBox = mode == UseLogicalOrdering ? InlineIterator::lastLeafOnLineInLogicalOrder(lineBox, orderCache) : lineBox->lastLeafBox(); |
| // 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. |
| while (true) { |
| if (!endBox) |
| return VisiblePosition(); |
| |
| endNode = endBox->renderer().nonPseudoNode(); |
| if (endNode) |
| break; |
| |
| if (mode == UseLogicalOrdering) |
| endBox = InlineIterator::previousLeafOnLineInLogicalOrder(endBox, orderCache); |
| else |
| endBox.traversePreviousOnLine(); |
| } |
| |
| Position pos; |
| if (is<HTMLBRElement>(*endNode)) |
| pos = positionBeforeNode(endNode); |
| else if (is<InlineIterator::TextBox>(*endBox) && is<Text>(*endNode)) { |
| auto& endTextBox = downcast<InlineIterator::TextBox>(*endBox); |
| int endOffset = endTextBox.start(); |
| if (!endTextBox.isLineBreak()) |
| endOffset += endTextBox.length(); |
| pos = Position(downcast<Text>(endNode), endOffset); |
| } else |
| pos = positionAfterNode(endNode); |
| |
| return VisiblePosition(pos, Affinity::Upstream); |
| } |
| |
| static bool inSameLogicalLine(const VisiblePosition& a, const VisiblePosition& b) |
| { |
| return a.isNotNull() && logicalStartOfLine(a) == logicalStartOfLine(b); |
| } |
| |
| static VisiblePosition endOfLine(const VisiblePosition& c, LineEndpointComputationMode mode, bool* reachedBoundary) |
| { |
| if (reachedBoundary) |
| *reachedBoundary = false; |
| // 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 = endPositionForLine(c, mode); |
| |
| if (mode == UseLogicalOrdering) { |
| // 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(); |
| |
| if (Node* editableRoot = highestEditableRoot(c.deepEquivalent())) { |
| if (!editableRoot->contains(visPos.deepEquivalent().containerNode())) { |
| VisiblePosition newPosition = lastPositionInNode(editableRoot); |
| if (reachedBoundary) |
| *reachedBoundary = c == newPosition; |
| return newPosition; |
| } |
| } |
| |
| return c.honorEditingBoundaryAtOrAfter(visPos, reachedBoundary); |
| } |
| |
| // 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, UseInlineBoxOrdering); |
| } |
| |
| return c.honorEditingBoundaryAtOrAfter(visPos, reachedBoundary); |
| } |
| |
| // FIXME: Rename this function to reflect the fact it ignores bidi levels. |
| VisiblePosition endOfLine(const VisiblePosition& currentPosition) |
| { |
| return endOfLine(currentPosition, UseInlineBoxOrdering, nullptr); |
| } |
| |
| VisiblePosition logicalEndOfLine(const VisiblePosition& currentPosition, bool* reachedBoundary) |
| { |
| return endOfLine(currentPosition, UseLogicalOrdering, reachedBoundary); |
| } |
| |
| 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); |
| } |
| |
| bool isLogicalEndOfLine(const VisiblePosition& p) |
| { |
| return p.isNotNull() && p == logicalEndOfLine(p); |
| } |
| |
| static inline IntPoint absoluteLineDirectionPointToLocalPointInBlock(InlineIterator::LineBoxIterator& lineBox, int lineDirectionPoint) |
| { |
| auto& containingBlock = lineBox->containingBlock(); |
| FloatPoint absoluteBlockPoint = containingBlock.localToAbsolute(FloatPoint()) - toFloatSize(containingBlock.scrollPosition()); |
| |
| if (containingBlock.isHorizontalWritingMode()) |
| return IntPoint(lineDirectionPoint - absoluteBlockPoint.x(), contentStartInBlockDirection(*lineBox)); |
| |
| return IntPoint(contentStartInBlockDirection(*lineBox), lineDirectionPoint - absoluteBlockPoint.y()); |
| } |
| |
| static Element* rootEditableOrDocumentElement(Node& node, EditableType editableType) |
| { |
| if (hasEditableStyle(node, editableType)) |
| return editableRootForPosition(firstPositionInOrBeforeNode(&node), editableType); |
| return node.document().documentElement(); |
| } |
| |
| VisiblePosition previousLinePosition(const VisiblePosition& visiblePosition, int lineDirectionPoint, EditableType editableType) |
| { |
| Position p = visiblePosition.deepEquivalent(); |
| Node* node = p.deprecatedNode(); |
| |
| if (!node) |
| return VisiblePosition(); |
| |
| node->document().updateLayoutIgnorePendingStylesheets(); |
| |
| RenderObject* renderer = node->renderer(); |
| if (!renderer) |
| return VisiblePosition(); |
| |
| InlineIterator::LineBoxIterator lineBox; |
| if (auto box = visiblePosition.inlineBoxAndOffset().box) { |
| lineBox = box->lineBox()->previous(); |
| // We want to skip zero height boxes. |
| // This could happen in case it is a LegacyRootInlineBox with trailing floats. |
| if (!lineBox || !lineBox->height() || !lineBox->firstLeafBox()) |
| lineBox = { }; |
| } |
| |
| if (!lineBox) { |
| Position position = previousLineCandidatePosition(node, visiblePosition, editableType); |
| if (position.isNotNull()) { |
| RenderedPosition renderedPosition(position); |
| lineBox = renderedPosition.lineBox(); |
| if (!lineBox) |
| return position; |
| } |
| } |
| |
| if (lineBox) { |
| // FIXME: Can be wrong for multi-column layout and with transforms. |
| auto pointInLine = absoluteLineDirectionPointToLocalPointInBlock(lineBox, lineDirectionPoint); |
| auto box = closestBoxForHorizontalPosition(*lineBox, lineBox->isHorizontal() ? pointInLine.x() : pointInLine.y(), isEditablePosition(p)); |
| if (!box) |
| return VisiblePosition(); |
| auto& renderer = box->renderer(); |
| Node* node = renderer.node(); |
| if (node && editingIgnoresContent(*node)) |
| return positionInParentBeforeNode(node); |
| return const_cast<RenderObject&>(renderer).positionForPoint(pointInLine, nullptr); |
| } |
| |
| // 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 = rootEditableOrDocumentElement(*node, editableType); |
| if (!rootElement) |
| return VisiblePosition(); |
| return firstPositionInNode(rootElement); |
| } |
| |
| VisiblePosition nextLinePosition(const VisiblePosition& visiblePosition, int lineDirectionPoint, EditableType editableType) |
| { |
| Position p = visiblePosition.deepEquivalent(); |
| Node* node = p.deprecatedNode(); |
| if (!node) |
| return VisiblePosition(); |
| |
| node->document().updateLayoutIgnorePendingStylesheets(); |
| |
| if (!node->renderer()) |
| return VisiblePosition(); |
| |
| InlineIterator::LineBoxIterator lineBox; |
| if (auto box = visiblePosition.inlineBoxAndOffset().box) { |
| lineBox = box->lineBox()->next(); |
| // We want to skip zero height boxes. |
| // This could happen in case it is a LegacyRootInlineBox with trailing floats. |
| if (!lineBox || !lineBox->height() || !lineBox->firstLeafBox()) |
| lineBox = { }; |
| } |
| |
| if (!lineBox) { |
| // FIXME: We need do the same in previousLinePosition. |
| Node* child = node->traverseToChildAt(p.deprecatedEditingOffset()); |
| node = child ? child : node->lastDescendant(); |
| Position position = nextLineCandidatePosition(node, visiblePosition, editableType); |
| if (position.isNotNull()) { |
| RenderedPosition renderedPosition(position); |
| lineBox = renderedPosition.lineBox(); |
| if (!lineBox) |
| return position; |
| } |
| } |
| |
| if (lineBox) { |
| // FIXME: Can be wrong for multi-column layout and with transforms. |
| auto pointInLine = absoluteLineDirectionPointToLocalPointInBlock(lineBox, lineDirectionPoint); |
| auto box = closestBoxForHorizontalPosition(*lineBox, lineBox->isHorizontal() ? pointInLine.x() : pointInLine.y(), isEditablePosition(p)); |
| if (!box) |
| return VisiblePosition(); |
| auto& renderer = box->renderer(); |
| Node* node = renderer.node(); |
| if (node && editingIgnoresContent(*node)) |
| return positionInParentBeforeNode(node); |
| return const_cast<RenderObject&>(renderer).positionForPoint(pointInLine, nullptr); |
| } |
| |
| // 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 = rootEditableOrDocumentElement(*node, editableType); |
| if (!rootElement) |
| return VisiblePosition(); |
| return lastPositionInNode(rootElement); |
| } |
| |
| // --------- |
| |
| unsigned startSentenceBoundary(StringView text, unsigned, BoundarySearchContextAvailability, bool&) |
| { |
| // FIXME: The following function can return -1; we don't handle that. |
| return ubrk_preceding(sentenceBreakIterator(text), text.length()); |
| } |
| |
| VisiblePosition startOfSentence(const VisiblePosition& position) |
| { |
| return previousBoundary(position, startSentenceBoundary, NeedsContextAtParagraphStart::Yes); |
| } |
| |
| unsigned endSentenceBoundary(StringView text, unsigned, BoundarySearchContextAvailability, bool&) |
| { |
| return ubrk_next(sentenceBreakIterator(text)); |
| } |
| |
| VisiblePosition endOfSentence(const VisiblePosition& position) |
| { |
| // FIXME: This includes the space after the punctuation that marks the end of the sentence. |
| return nextBoundary(position, endSentenceBoundary); |
| } |
| |
| static unsigned previousSentencePositionBoundary(StringView text, unsigned, BoundarySearchContextAvailability, bool&) |
| { |
| // FIXME: This is identical to startSentenceBoundary. I'm pretty sure that's not right. |
| // FIXME: The following function can return -1; we don't handle that. |
| return ubrk_preceding(sentenceBreakIterator(text), text.length()); |
| } |
| |
| VisiblePosition previousSentencePosition(const VisiblePosition& position) |
| { |
| return position.honorEditingBoundaryAtOrBefore(previousBoundary(position, previousSentencePositionBoundary)); |
| } |
| |
| static unsigned nextSentencePositionBoundary(StringView text, unsigned, BoundarySearchContextAvailability, bool&) |
| { |
| // FIXME: This is identical to endSentenceBoundary. |
| // That isn't right. This function needs to move to the equivalent position in the following sentence. |
| return ubrk_following(sentenceBreakIterator(text), 0); |
| } |
| |
| VisiblePosition nextSentencePosition(const VisiblePosition& position) |
| { |
| return position.honorEditingBoundaryAtOrAfter(nextBoundary(position, nextSentencePositionBoundary)); |
| } |
| |
| Node* findStartOfParagraph(Node* startNode, Node* highestRoot, Node* startBlock, int& offset, Position::AnchorType& type, EditingBoundaryCrossingRule boundaryCrossingRule) |
| { |
| Node* node = startNode; |
| Node* n = startNode; |
| while (n) { |
| if (boundaryCrossingRule == CannotCrossEditingBoundary && !Position::nodeIsUserSelectAll(n) && n->hasEditableStyle() != startNode->hasEditableStyle()) |
| break; |
| if (boundaryCrossingRule == CanSkipOverEditingBoundary) { |
| while (n && n->hasEditableStyle() != startNode->hasEditableStyle()) |
| n = NodeTraversal::previousPostOrder(*n, startBlock); |
| if (!n || !n->isDescendantOf(highestRoot)) |
| break; |
| } |
| RenderObject* r = n->renderer(); |
| if (!r) { |
| n = NodeTraversal::previousPostOrder(*n, startBlock); |
| continue; |
| } |
| const RenderStyle& style = r->style(); |
| if (style.visibility() != Visibility::Visible) { |
| n = NodeTraversal::previousPostOrder(*n, startBlock); |
| continue; |
| } |
| |
| if (r->isBR() || isBlock(n)) |
| break; |
| |
| if (is<RenderText>(*r) && downcast<RenderText>(*r).hasRenderedText()) { |
| ASSERT_WITH_SECURITY_IMPLICATION(is<Text>(*n)); |
| type = Position::PositionIsOffsetInAnchor; |
| if (style.preserveNewline()) { |
| StringImpl& text = downcast<RenderText>(*r).text(); |
| int i = text.length(); |
| int o = offset; |
| if (n == startNode && o < i) |
| i = std::max(0, o); |
| while (--i >= 0) { |
| if (text[i] == '\n') { |
| offset = i + 1; |
| return n; |
| } |
| } |
| } |
| node = n; |
| offset = 0; |
| n = NodeTraversal::previousPostOrder(*n, startBlock); |
| } else if (editingIgnoresContent(*n) || isRenderedTable(n)) { |
| node = n; |
| type = Position::PositionIsBeforeAnchor; |
| n = n->previousSibling() ? n->previousSibling() : NodeTraversal::previousPostOrder(*n, startBlock); |
| } else |
| n = NodeTraversal::previousPostOrder(*n, startBlock); |
| } |
| |
| return node; |
| } |
| |
| Node* findEndOfParagraph(Node* startNode, Node* highestRoot, Node* stayInsideBlock, int& offset, Position::AnchorType& type, EditingBoundaryCrossingRule boundaryCrossingRule) |
| { |
| Node* node = startNode; |
| Node* n = startNode; |
| while (n) { |
| if (boundaryCrossingRule == CannotCrossEditingBoundary && !Position::nodeIsUserSelectAll(n) && n->hasEditableStyle() != startNode->hasEditableStyle()) |
| break; |
| if (boundaryCrossingRule == CanSkipOverEditingBoundary) { |
| while (n && n->hasEditableStyle() != startNode->hasEditableStyle()) |
| n = NodeTraversal::next(*n, stayInsideBlock); |
| if (!n || !n->isDescendantOf(highestRoot)) |
| break; |
| } |
| |
| RenderObject* r = n->renderer(); |
| if (!r) { |
| n = NodeTraversal::next(*n, stayInsideBlock); |
| continue; |
| } |
| const RenderStyle& style = r->style(); |
| if (style.visibility() != Visibility::Visible) { |
| n = NodeTraversal::next(*n, stayInsideBlock); |
| continue; |
| } |
| |
| // FIXME: This is wrong when startNode is a block. We should return a position after the block. |
| if (r->isBR() || is<HTMLBRElement>(n) || isBlock(n)) |
| break; |
| |
| // FIXME: We avoid returning a position where the renderer can't accept the caret. |
| if (is<RenderText>(*r) && downcast<RenderText>(*r).hasRenderedText()) { |
| ASSERT_WITH_SECURITY_IMPLICATION(is<Text>(*n)); |
| type = Position::PositionIsOffsetInAnchor; |
| if (style.preserveNewline()) { |
| StringImpl& text = downcast<RenderText>(*r).text(); |
| int o = n == startNode ? offset : 0; |
| int length = text.length(); |
| for (int i = o; i < length; ++i) { |
| if (text[i] == '\n') { |
| offset = i; |
| return n; |
| } |
| } |
| } |
| node = n; |
| offset = r->caretMaxOffset(); |
| n = NodeTraversal::next(*n, stayInsideBlock); |
| } else if (editingIgnoresContent(*n) || isRenderedTable(n)) { |
| node = n; |
| type = Position::PositionIsAfterAnchor; |
| n = NodeTraversal::nextSkippingChildren(*n, stayInsideBlock); |
| } else |
| n = NodeTraversal::next(*n, stayInsideBlock); |
| } |
| return node; |
| } |
| |
| VisiblePosition startOfParagraph(const VisiblePosition& c, EditingBoundaryCrossingRule boundaryCrossingRule) |
| { |
| Position p = c.deepEquivalent(); |
| auto* startNode = p.deprecatedNode(); |
| |
| if (!startNode) |
| return VisiblePosition(); |
| |
| if (isRenderedAsNonInlineTableImageOrHR(startNode)) |
| return positionBeforeNode(startNode); |
| |
| Node* startBlock = enclosingBlock(startNode); |
| |
| auto* highestRoot = highestEditableRoot(p); |
| int offset = p.deprecatedEditingOffset(); |
| Position::AnchorType type = p.anchorType(); |
| |
| auto* node = findStartOfParagraph(startNode, highestRoot, startBlock, offset, type, boundaryCrossingRule); |
| |
| if (is<Text>(node)) |
| return Position(downcast<Text>(node), offset); |
| |
| if (type == Position::PositionIsOffsetInAnchor) { |
| ASSERT(type == Position::PositionIsOffsetInAnchor || !offset); |
| return Position(node, offset, type); |
| } |
| |
| return Position(node, type); |
| } |
| |
| VisiblePosition endOfParagraph(const VisiblePosition& c, EditingBoundaryCrossingRule boundaryCrossingRule) |
| { |
| if (c.isNull()) |
| return VisiblePosition(); |
| |
| Position p = c.deepEquivalent(); |
| auto* startNode = p.deprecatedNode(); |
| |
| if (isRenderedAsNonInlineTableImageOrHR(startNode)) |
| return positionAfterNode(startNode); |
| |
| auto* startBlock = enclosingBlock(startNode); |
| auto* stayInsideBlock = startBlock; |
| |
| auto* highestRoot = highestEditableRoot(p); |
| int offset = p.deprecatedEditingOffset(); |
| Position::AnchorType type = p.anchorType(); |
| |
| auto* node = findEndOfParagraph(startNode, highestRoot, stayInsideBlock, offset, type, boundaryCrossingRule); |
| |
| if (is<Text>(node)) |
| return Position(downcast<Text>(node), offset); |
| |
| if (type == Position::PositionIsOffsetInAnchor) |
| return Position(node, offset, type); |
| |
| return Position(node, type); |
| } |
| |
| // 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); |
| } |
| |
| bool isBlankParagraph(const VisiblePosition& position) |
| { |
| return isStartOfParagraph(position) && startOfParagraph(position.next()) != startOfParagraph(position); |
| } |
| |
| 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 || !node->document().documentElement()) |
| return VisiblePosition(); |
| |
| // The canonicalization of the position at (documentElement, 0) can turn the visible |
| // position to null, even when there's a valid candidate to be had, because the root HTML element |
| // is not content editable. So we construct directly from the valid candidate. |
| Position firstCandidate = nextCandidate(makeDeprecatedLegacyPosition(node->document().documentElement(), 0)); |
| if (firstCandidate.isNull()) |
| return VisiblePosition(); |
| return VisiblePosition(firstCandidate); |
| } |
| |
| VisiblePosition startOfDocument(const VisiblePosition& c) |
| { |
| return startOfDocument(c.deepEquivalent().deprecatedNode()); |
| } |
| |
| VisiblePosition endOfDocument(const Node* node) |
| { |
| if (!node || !node->document().documentElement()) |
| return VisiblePosition(); |
| |
| // (As above, in startOfDocument.) The canonicalization can reject valid visible positions |
| // when descending from the root element, so we construct the visible position directly from a |
| // valid candidate. |
| Position lastPosition = makeDeprecatedLegacyPosition(node->document().documentElement(), node->document().documentElement()->countChildNodes()); |
| Position lastCandidate = previousCandidate(lastPosition); |
| if (lastCandidate.isNull()) |
| return VisiblePosition(); |
| return VisiblePosition(lastCandidate); |
| } |
| |
| 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(CanCrossEditingBoundary).isNull(); |
| } |
| |
| bool isEndOfDocument(const VisiblePosition& p) |
| { |
| return p.isNotNull() && p.next(CanCrossEditingBoundary).isNull(); |
| } |
| |
| // --------- |
| |
| VisiblePosition startOfEditableContent(const VisiblePosition& visiblePosition) |
| { |
| auto* highestRoot = highestEditableRoot(visiblePosition.deepEquivalent()); |
| if (!highestRoot) |
| return { }; |
| |
| return firstPositionInNode(highestRoot); |
| } |
| |
| VisiblePosition endOfEditableContent(const VisiblePosition& visiblePosition) |
| { |
| auto* highestRoot = highestEditableRoot(visiblePosition.deepEquivalent()); |
| if (!highestRoot) |
| return { }; |
| |
| return lastPositionInNode(highestRoot); |
| } |
| |
| bool isEndOfEditableOrNonEditableContent(const VisiblePosition& p) |
| { |
| return p.isNotNull() && p.next().isNull(); |
| } |
| |
| VisiblePosition leftBoundaryOfLine(const VisiblePosition& c, TextDirection direction, bool* reachedBoundary) |
| { |
| return direction == TextDirection::LTR ? logicalStartOfLine(c, reachedBoundary) : logicalEndOfLine(c, reachedBoundary); |
| } |
| |
| VisiblePosition rightBoundaryOfLine(const VisiblePosition& c, TextDirection direction, bool* reachedBoundary) |
| { |
| return direction == TextDirection::LTR ? logicalEndOfLine(c, reachedBoundary) : logicalStartOfLine(c, reachedBoundary); |
| } |
| |
| static bool directionIsDownstream(SelectionDirection direction) |
| { |
| if (direction == SelectionDirection::Backward) |
| return false; |
| if (direction == SelectionDirection::Forward) |
| return true; |
| |
| // FIXME: this code doesn't take into account the original direction of the element. |
| // I'm not fixing this now because I'm afraid there is some code in UIKit relying on |
| // this wrong behavior. |
| return direction == SelectionDirection::Right; |
| } |
| |
| bool atBoundaryOfGranularity(const VisiblePosition& vp, TextGranularity granularity, SelectionDirection direction) |
| { |
| if (granularity == TextGranularity::CharacterGranularity) |
| return true; |
| |
| VisiblePosition boundary; |
| |
| bool useDownstream = directionIsDownstream(direction); |
| |
| switch (granularity) { |
| case TextGranularity::WordGranularity: |
| // visible_units claims erroneously that the start and the end |
| // of a paragraph are the end and start of a word, respectively. |
| if ((useDownstream && isStartOfParagraph(vp)) || (!useDownstream && isEndOfParagraph(vp))) |
| return false; |
| |
| // Note that "Left" and "Right" in this context apparently mean "upstream/previous" and "downstream/next". |
| boundary = useDownstream ? endOfWord(vp, LeftWordIfOnBoundary) : startOfWord(vp, RightWordIfOnBoundary); |
| break; |
| |
| case TextGranularity::SentenceGranularity: { |
| auto boundaryInDirection = useDownstream ? endOfSentence : startOfSentence; |
| if (vp == boundaryInDirection(vp)) { |
| boundary = vp; |
| break; |
| } |
| |
| auto position = useDownstream ? previousSentencePosition(vp) : nextSentencePosition(vp); |
| boundary = boundaryInDirection(position); |
| break; |
| } |
| |
| case TextGranularity::LineGranularity: |
| boundary = vp; |
| boundary.setAffinity(useDownstream ? Affinity::Upstream : Affinity::Downstream); |
| boundary = useDownstream ? endOfLine(boundary) : startOfLine(boundary); |
| break; |
| |
| case TextGranularity::ParagraphGranularity: |
| boundary = useDownstream ? endOfParagraph(vp) : startOfParagraph(vp); |
| break; |
| |
| case TextGranularity::DocumentGranularity: |
| boundary = useDownstream ? endOfDocument(vp) : startOfDocument(vp); |
| break; |
| |
| default: |
| ASSERT_NOT_REACHED(); |
| break; |
| } |
| |
| return vp == boundary; |
| } |
| |
| bool withinTextUnitOfGranularity(const VisiblePosition& vp, TextGranularity granularity, SelectionDirection direction) |
| { |
| if (granularity == TextGranularity::CharacterGranularity || granularity == TextGranularity::DocumentGranularity) |
| return true; |
| |
| bool useDownstream = directionIsDownstream(direction); |
| |
| VisiblePosition prevBoundary; |
| VisiblePosition nextBoundary; |
| |
| switch (granularity) { |
| case TextGranularity::WordGranularity: |
| // Note that "Left" and "Right" in this context apparently mean "upstream/previous" and "downstream/next". |
| prevBoundary = startOfWord(vp, (useDownstream ? RightWordIfOnBoundary : LeftWordIfOnBoundary)); |
| nextBoundary = endOfWord(vp, (useDownstream ? RightWordIfOnBoundary : LeftWordIfOnBoundary)); |
| |
| // Workaround for <rdar://problem/7259611> Word boundary code on iPhone gives different results than desktop |
| if (endOfWord(prevBoundary, RightWordIfOnBoundary) != nextBoundary) |
| return false; |
| |
| break; |
| |
| case TextGranularity::SentenceGranularity: |
| prevBoundary = startOfSentence(vp); |
| nextBoundary = endOfSentence(vp); |
| break; |
| |
| case TextGranularity::LineGranularity: |
| prevBoundary = startOfLine(vp); |
| nextBoundary = endOfLine(vp); |
| |
| if (prevBoundary == nextBoundary) { |
| nextBoundary = nextLinePosition(nextBoundary, 0); |
| nextBoundary.setAffinity(Affinity::Upstream); |
| if (!inSameLine(prevBoundary, nextBoundary)) |
| nextBoundary = vp.next(); |
| } |
| break; |
| |
| case TextGranularity::ParagraphGranularity: |
| prevBoundary = startOfParagraph(vp); |
| nextBoundary = endOfParagraph(vp); |
| break; |
| |
| default: |
| ASSERT_NOT_REACHED(); |
| break; |
| } |
| |
| if (prevBoundary == nextBoundary) |
| return false; |
| |
| if (vp == prevBoundary) |
| return useDownstream; |
| |
| if (vp == nextBoundary) |
| return !useDownstream; |
| |
| return (prevBoundary < vp && vp < nextBoundary); |
| } |
| |
| static VisiblePosition nextCharacterBoundaryInDirection(const VisiblePosition& vp, SelectionDirection direction, EditingBoundaryCrossingRule rule) |
| { |
| return directionIsDownstream(direction) ? vp.next(rule) : vp.previous(rule); |
| } |
| |
| static VisiblePosition nextWordBoundaryInDirection(const VisiblePosition& vp, SelectionDirection direction) |
| { |
| bool useDownstream = directionIsDownstream(direction); |
| bool withinUnitOfGranularity = withinTextUnitOfGranularity(vp, TextGranularity::WordGranularity, direction); |
| VisiblePosition result; |
| |
| if (useDownstream) { |
| if (withinUnitOfGranularity) |
| result = endOfWord(vp, RightWordIfOnBoundary); |
| else { |
| VisiblePosition start = startOfWord(vp, RightWordIfOnBoundary); |
| if (start > vp && start != endOfWord(start)) |
| result = start; |
| else { |
| // Do same thing as backwards traveling below. |
| start = vp; |
| while (true) { |
| result = startOfWord(nextWordPosition(start), RightWordIfOnBoundary); |
| |
| if (result == start) |
| break; |
| |
| // We failed to find a word boundary. |
| if (result.isNull() || result < start) |
| return VisiblePosition(); |
| |
| // We consider successs also the case where start is before element and result is after. |
| // This covers moving past images like words. |
| if (result != endOfWord(result) |
| || (result.deepEquivalent().anchorNode() == start.deepEquivalent().anchorNode() |
| && result.deepEquivalent().anchorType() == Position::PositionIsAfterAnchor |
| && start.deepEquivalent().anchorType() == Position::PositionIsBeforeAnchor)) |
| break; |
| |
| start = result; |
| } |
| } |
| } |
| } else { |
| if (withinUnitOfGranularity) |
| result = startOfWord(vp, LeftWordIfOnBoundary); |
| else { |
| // This is complicated because: |
| // When given "Blah blah.|", endOfWord is "Blah blah|.", and previousWordPosition is "Blah| blah." |
| // When given "Blah blah. |", endOfWord is "Blah blah.| ", and previousWordPosition is "Blah |blah. ". |
| VisiblePosition end = endOfWord(vp, LeftWordIfOnBoundary); |
| if (end < vp && end != startOfWord(end)) |
| result = end; |
| else { |
| end = vp; |
| while (true) { |
| result = endOfWord(previousWordPosition(end), RightWordIfOnBoundary); |
| |
| if (result == end) |
| break; |
| |
| if (result.isNull() || result > end) |
| return VisiblePosition(); |
| |
| if (result != startOfWord(result)) |
| break; |
| |
| end = result; |
| } |
| } |
| } |
| } |
| |
| if (result == vp) |
| return VisiblePosition(); |
| |
| return result; |
| } |
| |
| static VisiblePosition nextSentenceBoundaryInDirection(const VisiblePosition& vp, SelectionDirection direction) |
| { |
| bool useDownstream = directionIsDownstream(direction); |
| bool withinUnitOfGranularity = withinTextUnitOfGranularity(vp, TextGranularity::SentenceGranularity, direction); |
| VisiblePosition result; |
| |
| if (withinUnitOfGranularity) |
| result = useDownstream ? endOfSentence(vp) : startOfSentence(vp); |
| else { |
| result = useDownstream ? nextSentencePosition(vp) : previousSentencePosition(vp); |
| if (result.isNull() || result == vp) |
| return VisiblePosition(); |
| |
| result = useDownstream ? startOfSentence(result) : endOfSentence(result); |
| } |
| |
| if (result == vp) |
| return VisiblePosition(); |
| |
| // Positions can only be compared if they are in the same tree scope. |
| ASSERT_IMPLIES(areVisiblePositionsInSameTreeScope(result, vp), useDownstream ? (result > vp) : (result < vp)); |
| |
| return result; |
| } |
| |
| static VisiblePosition nextLineBoundaryInDirection(const VisiblePosition& vp, SelectionDirection direction) |
| { |
| bool useDownstream = directionIsDownstream(direction); |
| VisiblePosition result = vp; |
| |
| if (useDownstream) { |
| result.setAffinity(Affinity::Downstream); |
| result = isEndOfLine(result) ? startOfLine(nextLinePosition(result, result.lineDirectionPointForBlockDirectionNavigation())) : endOfLine(result); |
| } else { |
| result.setAffinity(Affinity::Upstream); |
| result = isStartOfLine(result) ? endOfLine(previousLinePosition(result, result.lineDirectionPointForBlockDirectionNavigation())) : startOfLine(result); |
| } |
| |
| return result; |
| } |
| |
| static VisiblePosition nextParagraphBoundaryInDirection(const VisiblePosition& position, SelectionDirection direction) |
| { |
| auto useDownstream = directionIsDownstream(direction); |
| auto lineDirection = position.lineDirectionPointForBlockDirectionNavigation(); |
| if (atBoundaryOfGranularity(position, TextGranularity::ParagraphGranularity, direction)) |
| return useDownstream ? startOfParagraph(nextParagraphPosition(position, lineDirection)) : endOfParagraph(previousParagraphPosition(position, lineDirection)); |
| ASSERT(withinTextUnitOfGranularity(position, TextGranularity::ParagraphGranularity, direction)); |
| return useDownstream ? endOfParagraph(position) : startOfParagraph(position); |
| } |
| |
| static VisiblePosition nextDocumentBoundaryInDirection(const VisiblePosition& vp, SelectionDirection direction) |
| { |
| return directionIsDownstream(direction) ? endOfDocument(vp) : startOfDocument(vp); |
| } |
| |
| VisiblePosition positionOfNextBoundaryOfGranularity(const VisiblePosition& vp, TextGranularity granularity, SelectionDirection direction) |
| { |
| switch (granularity) { |
| case TextGranularity::CharacterGranularity: |
| return nextCharacterBoundaryInDirection(vp, direction, CanCrossEditingBoundary); |
| case TextGranularity::WordGranularity: |
| return nextWordBoundaryInDirection(vp, direction); |
| case TextGranularity::SentenceGranularity: |
| return nextSentenceBoundaryInDirection(vp, direction); |
| case TextGranularity::LineGranularity: |
| return nextLineBoundaryInDirection(vp, direction); |
| case TextGranularity::ParagraphGranularity: |
| return nextParagraphBoundaryInDirection(vp, direction); |
| case TextGranularity::DocumentGranularity: |
| return nextDocumentBoundaryInDirection(vp, direction); |
| default: |
| ASSERT_NOT_REACHED(); |
| return VisiblePosition(); |
| } |
| } |
| |
| std::optional<SimpleRange> enclosingTextUnitOfGranularity(const VisiblePosition& vp, TextGranularity granularity, SelectionDirection direction) |
| { |
| // This is particularly inefficient. We could easily obtain the answer with the boundaries computed below. |
| if (!withinTextUnitOfGranularity(vp, granularity, direction)) |
| return std::nullopt; |
| |
| VisiblePosition prevBoundary; |
| VisiblePosition nextBoundary; |
| bool useDownstream = directionIsDownstream(direction); |
| |
| switch (granularity) { |
| case TextGranularity::CharacterGranularity: |
| prevBoundary = vp; |
| nextBoundary = prevBoundary.next(); |
| break; |
| |
| case TextGranularity::WordGranularity: |
| // NB: "Left" and "Right" in this context apparently mean "upstream/previous" and "downstream/next". |
| if (useDownstream) { |
| prevBoundary = startOfWord(vp, RightWordIfOnBoundary); |
| nextBoundary = endOfWord(vp, RightWordIfOnBoundary); |
| } else { |
| prevBoundary = startOfWord(vp, LeftWordIfOnBoundary); |
| nextBoundary = endOfWord(vp, LeftWordIfOnBoundary); |
| } |
| break; |
| |
| case TextGranularity::SentenceGranularity: |
| prevBoundary = startOfSentence(vp); |
| nextBoundary = endOfSentence(vp); |
| break; |
| |
| case TextGranularity::LineGranularity: |
| prevBoundary = startOfLine(vp); |
| nextBoundary = endOfLine(vp); |
| |
| if (prevBoundary == nextBoundary) { |
| nextBoundary = nextLinePosition(nextBoundary, 0); |
| nextBoundary.setAffinity(Affinity::Upstream); |
| if (!inSameLine(prevBoundary, nextBoundary)) |
| nextBoundary = vp.next(); |
| } |
| break; |
| |
| case TextGranularity::ParagraphGranularity: |
| prevBoundary = startOfParagraph(vp); |
| nextBoundary = endOfParagraph(vp); |
| break; |
| |
| case TextGranularity::DocumentGranularity: |
| prevBoundary = startOfDocument(vp); |
| nextBoundary = endOfDocument(vp); |
| break; |
| |
| default: |
| ASSERT_NOT_REACHED(); |
| return std::nullopt; |
| } |
| |
| if (prevBoundary.isNull() || nextBoundary.isNull()) |
| return std::nullopt; |
| |
| if (vp < prevBoundary || vp > nextBoundary) |
| return std::nullopt; |
| |
| return makeSimpleRange(prevBoundary, nextBoundary); |
| } |
| |
| std::ptrdiff_t distanceBetweenPositions(const VisiblePosition& a, const VisiblePosition& b) |
| { |
| if (a.isNull() || b.isNull()) |
| return 0; |
| return a < b ? -characterCount(*makeSimpleRange(a, b)) : characterCount(*makeSimpleRange(b, a)); |
| } |
| |
| void charactersAroundPosition(const VisiblePosition& position, UChar32& oneAfter, UChar32& oneBefore, UChar32& twoBefore) |
| { |
| const int maxCharacters = 3; |
| UChar32 characters[maxCharacters] = { 0 }; |
| |
| if (position.isNull() || isStartOfDocument(position)) |
| return; |
| |
| VisiblePosition startPosition = position; |
| VisiblePosition endPosition = position; |
| |
| VisiblePosition nextPosition = nextCharacterBoundaryInDirection(position, SelectionDirection::Forward, CannotCrossEditingBoundary); |
| if (nextPosition.isNotNull()) |
| endPosition = nextPosition; |
| |
| VisiblePosition previousPosition = nextCharacterBoundaryInDirection(position, SelectionDirection::Backward, CannotCrossEditingBoundary); |
| if (previousPosition.isNotNull()) { |
| startPosition = previousPosition; |
| previousPosition = nextCharacterBoundaryInDirection(previousPosition, SelectionDirection::Backward, CannotCrossEditingBoundary); |
| if (previousPosition.isNotNull()) |
| startPosition = previousPosition; |
| } |
| |
| if (startPosition != endPosition) { |
| String characterString = makeStringByReplacingAll(plainText(*makeSimpleRange(startPosition, endPosition)), noBreakSpace, ' '); |
| for (int i = characterString.length() - 1, index = 0; i >= 0 && index < maxCharacters; --i) { |
| if (!index && nextPosition.isNull()) |
| index++; |
| characters[index++] = characterString[i]; |
| } |
| } |
| oneAfter = characters[0]; |
| oneBefore = characters[1]; |
| twoBefore = characters[2]; |
| } |
| |
| std::optional<SimpleRange> wordRangeFromPosition(const VisiblePosition& position) |
| { |
| if (position.isNull()) |
| return std::nullopt; |
| |
| if (auto range = enclosingTextUnitOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Backward)) |
| return range; |
| if (auto range = enclosingTextUnitOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Forward)) |
| return range; |
| |
| VisiblePosition currentPosition = position; |
| do { |
| currentPosition = positionOfNextBoundaryOfGranularity(currentPosition, TextGranularity::WordGranularity, SelectionDirection::Backward); |
| } while (currentPosition.isNotNull() && !atBoundaryOfGranularity(currentPosition, TextGranularity::WordGranularity, SelectionDirection::Backward)); |
| if (currentPosition.isNull()) |
| currentPosition = positionOfNextBoundaryOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Forward); |
| return makeSimpleRange(currentPosition, position); |
| } |
| |
| VisiblePosition closestWordBoundaryForPosition(const VisiblePosition& position) |
| { |
| VisiblePosition result; |
| if (atBoundaryOfGranularity(position, TextGranularity::LineGranularity, SelectionDirection::Forward)) { |
| // Don't cross line boundaries. |
| result = position; |
| } else if (withinTextUnitOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Forward)) { |
| // The position lies within a word. |
| if (auto wordRange = enclosingTextUnitOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Forward)) { |
| result = makeDeprecatedLegacyPosition(wordRange->start); |
| if (distanceBetweenPositions(position, result) > 1) |
| result = makeDeprecatedLegacyPosition(wordRange->end); |
| } |
| } else if (atBoundaryOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Backward)) { |
| // The position is at the end of a word. |
| result = position; |
| } else { |
| // The position is not within a word. |
| // Go to the next boundary. |
| result = positionOfNextBoundaryOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Forward); |
| |
| // If there is no such boundary we go to the end of the element. |
| if (result.isNull()) |
| result = endOfEditableContent(position); |
| } |
| return result; |
| } |
| |
| std::optional<SimpleRange> rangeExpandedByCharactersInDirectionAtWordBoundary(const VisiblePosition& position, int numberOfCharactersToExpand, SelectionDirection direction) |
| { |
| Position start = position.deepEquivalent(); |
| Position end = position.deepEquivalent(); |
| for (int i = 0; i < numberOfCharactersToExpand; ++i) { |
| if (direction == SelectionDirection::Backward) |
| start = start.previous(Character); |
| else |
| end = end.next(Character); |
| } |
| |
| if (direction == SelectionDirection::Backward && !atBoundaryOfGranularity(start, TextGranularity::WordGranularity, SelectionDirection::Backward)) |
| start = startOfWord(start).deepEquivalent(); |
| if (direction == SelectionDirection::Forward && !atBoundaryOfGranularity(end, TextGranularity::WordGranularity, SelectionDirection::Forward)) |
| end = endOfWord(end).deepEquivalent(); |
| |
| return makeSimpleRange(start, end); |
| } |
| |
| std::optional<SimpleRange> rangeExpandedAroundPositionByCharacters(const VisiblePosition& position, int numberOfCharactersToExpand) |
| { |
| Position start = position.deepEquivalent(); |
| Position end = position.deepEquivalent(); |
| for (int i = 0; i < numberOfCharactersToExpand; ++i) { |
| start = start.previous(Character); |
| end = end.next(Character); |
| } |
| return makeSimpleRange(start, end); |
| } |
| |
| std::pair<VisiblePosition, WithinWordBoundary> wordBoundaryForPositionWithoutCrossingLine(const VisiblePosition& position) |
| { |
| if (atBoundaryOfGranularity(position, TextGranularity::LineGranularity, SelectionDirection::Forward)) |
| return { position, WithinWordBoundary::No }; |
| |
| if (withinTextUnitOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Forward)) { |
| auto adjustedPosition = position; |
| if (auto wordRange = enclosingTextUnitOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Forward)) { |
| adjustedPosition = makeDeprecatedLegacyPosition(wordRange->start); |
| if (distanceBetweenPositions(position, adjustedPosition) > 1) |
| adjustedPosition = makeDeprecatedLegacyPosition(wordRange->end); |
| } |
| return { adjustedPosition, WithinWordBoundary::Yes }; |
| } |
| |
| if (atBoundaryOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Backward)) |
| return { position, WithinWordBoundary::No }; |
| |
| auto nextWordBoundary = positionOfNextBoundaryOfGranularity(position, TextGranularity::WordGranularity, SelectionDirection::Forward); |
| return { nextWordBoundary.isNotNull() ? nextWordBoundary : endOfEditableContent(position), WithinWordBoundary::No }; |
| } |
| |
| } |
