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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "TextDirectiveUtil.h"
#include "nsComputedDOMStyle.h"
#include "nsDOMAttributeMap.h"
#include "nsFind.h"
#include "nsFrameSelection.h"
#include "nsGkAtoms.h"
#include "nsIFrame.h"
#include "nsINode.h"
#include "nsIURI.h"
#include "nsRange.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsUnicharUtils.h"
#include "ContentIterator.h"
#include "Document.h"
#include "fragmentdirectives_ffi_generated.h"
#include "Text.h"
#include "mozilla/ContentIterator.h"
#include "mozilla/ResultVariant.h"
#include "mozilla/intl/WordBreaker.h"
#include "mozilla/SelectionMovementUtils.h"
namespace mozilla::dom {
LazyLogModule gFragmentDirectiveLog("FragmentDirective");
/* static */
Result<nsString, ErrorResult> TextDirectiveUtil::RangeContentAsString(
nsRange* aRange) {
nsString content;
if (!aRange || aRange->Collapsed()) {
return content;
}
UnsafePreContentIterator iter;
nsresult rv = iter.Init(aRange);
if (NS_FAILED(rv)) {
return Err(ErrorResult(rv));
}
for (; !iter.IsDone(); iter.Next()) {
nsINode* current = iter.GetCurrentNode();
if (!TextDirectiveUtil::NodeIsVisibleTextNode(*current) ||
TextDirectiveUtil::NodeIsPartOfNonSearchableSubTree(*current)) {
continue;
}
const uint32_t startOffset =
current == aRange->GetStartContainer() ? aRange->StartOffset() : 0;
const uint32_t endOffset =
std::min(current == aRange->GetEndContainer() ? aRange->EndOffset()
: current->Length(),
current->Length());
const Text* text = Text::FromNode(current);
text->TextFragment().AppendTo(content, startOffset,
endOffset - startOffset);
}
content.CompressWhitespace();
return content;
}
/* static */ Result<nsString, ErrorResult>
TextDirectiveUtil::RangeContentAsFoldCase(nsRange* aRange) {
Result<nsString, ErrorResult> contentResult = RangeContentAsString(aRange);
if (MOZ_UNLIKELY(contentResult.isErr())) {
return contentResult.propagateErr();
}
nsString content = contentResult.unwrap();
content.CompressWhitespace();
ToFoldedCase(content);
return content;
}
/* static */ bool TextDirectiveUtil::NodeIsVisibleTextNode(
const nsINode& aNode) {
const Text* text = Text::FromNode(aNode);
if (!text) {
return false;
}
const nsIFrame* frame = text->GetPrimaryFrame();
return frame && frame->StyleVisibility()->IsVisible();
}
/* static */ RefPtr<nsRange> TextDirectiveUtil::FindStringInRange(
const RangeBoundary& aSearchStart, const RangeBoundary& aSearchEnd,
const nsAString& aQuery, bool aWordStartBounded, bool aWordEndBounded,
nsContentUtils::NodeIndexCache* aCache) {
TEXT_FRAGMENT_LOG("query='{}', wordStartBounded='{}', wordEndBounded='{}'.\n",
NS_ConvertUTF16toUTF8(aQuery), aWordStartBounded,
aWordEndBounded);
RefPtr<nsFind> finder = new nsFind();
finder->SetWordStartBounded(aWordStartBounded);
finder->SetWordEndBounded(aWordEndBounded);
finder->SetCaseSensitive(false);
finder->SetNodeIndexCache(aCache);
RefPtr<nsRange> result =
finder->FindFromRangeBoundaries(aQuery, aSearchStart, aSearchEnd);
if (!result || result->Collapsed()) {
TEXT_FRAGMENT_LOG("Did not find query '{}'", NS_ConvertUTF16toUTF8(aQuery));
} else {
auto rangeToString = [](nsRange* range) -> nsCString {
nsString rangeString;
range->ToString(rangeString, IgnoreErrors());
return NS_ConvertUTF16toUTF8(rangeString);
};
TEXT_FRAGMENT_LOG("find returned '{}'", rangeToString(result));
}
return result;
}
/* static */ RangeBoundary TextDirectiveUtil::MoveRangeBoundaryOneWord(
const RangeBoundary& aRangeBoundary, TextScanDirection aDirection) {
MOZ_ASSERT(aRangeBoundary.IsSetAndValid());
PeekOffsetOptions options = {PeekOffsetOption::JumpLines,
PeekOffsetOption::StopAtScroller,
PeekOffsetOption::IsKeyboardSelect};
Result<RangeBoundary, nsresult> newBoundary =
SelectionMovementUtils::MoveRangeBoundaryToSomewhere(
aRangeBoundary,
aDirection == TextScanDirection::Left ? nsDirection::eDirPrevious
: nsDirection::eDirNext,
aDirection == TextScanDirection::Left ? CaretAssociationHint::Before
: CaretAssociationHint::After,
intl::BidiEmbeddingLevel::DefaultLTR(),
nsSelectionAmount::eSelectWord, options);
return newBoundary.unwrapOr({});
}
/* static */ bool TextDirectiveUtil::IsWhitespaceAtPosition(const Text* aText,
uint32_t aPos) {
if (!aText || aText->Length() == 0 || aPos >= aText->Length()) {
return false;
}
const nsTextFragment& frag = aText->TextFragment();
const char NBSP_CHAR = char(0xA0);
if (frag.Is2b()) {
const char16_t* content = frag.Get2b();
return IsSpaceCharacter(content[aPos]) ||
content[aPos] == char16_t(NBSP_CHAR);
}
const char* content = frag.Get1b();
return IsSpaceCharacter(content[aPos]) || content[aPos] == NBSP_CHAR;
}
/* static */ bool TextDirectiveUtil::NodeIsSearchInvisible(nsINode& aNode) {
if (!aNode.IsElement()) {
return false;
}
// 2. If the node serializes as void.
nsAtom* nodeNameAtom = aNode.NodeInfo()->NameAtom();
if (FragmentOrElement::IsHTMLVoid(nodeNameAtom)) {
return true;
}
// 3. Is any of the following types: HTMLIFrameElement, HTMLImageElement,
// HTMLMeterElement, HTMLObjectElement, HTMLProgressElement, HTMLStyleElement,
// HTMLScriptElement, HTMLVideoElement, HTMLAudioElement
if (aNode.IsAnyOfHTMLElements(
nsGkAtoms::iframe, nsGkAtoms::image, nsGkAtoms::meter,
nsGkAtoms::object, nsGkAtoms::progress, nsGkAtoms::style,
nsGkAtoms::script, nsGkAtoms::video, nsGkAtoms::audio)) {
return true;
}
// 4. Is a select element whose multiple content attribute is absent.
if (aNode.IsHTMLElement(nsGkAtoms::select)) {
return aNode.GetAttributes()->GetNamedItem(u"multiple"_ns) == nullptr;
}
// This is tested last because it's the most expensive check.
// 1. The computed value of its 'display' property is 'none'.
const Element* nodeAsElement = Element::FromNode(aNode);
const RefPtr<const ComputedStyle> computedStyle =
nsComputedDOMStyle::GetComputedStyleNoFlush(nodeAsElement);
return !computedStyle ||
computedStyle->StyleDisplay()->mDisplay == StyleDisplay::None;
}
/* static */ bool TextDirectiveUtil::NodeHasBlockLevelDisplay(nsINode& aNode) {
if (!aNode.IsElement()) {
return false;
}
const Element* nodeAsElement = Element::FromNode(aNode);
const RefPtr<const ComputedStyle> computedStyle =
nsComputedDOMStyle::GetComputedStyleNoFlush(nodeAsElement);
if (!computedStyle) {
return false;
}
const StyleDisplay& styleDisplay = computedStyle->StyleDisplay()->mDisplay;
return styleDisplay == StyleDisplay::Block ||
styleDisplay == StyleDisplay::Table ||
styleDisplay == StyleDisplay::FlowRoot ||
styleDisplay == StyleDisplay::Grid ||
styleDisplay == StyleDisplay::Flex || styleDisplay.IsListItem();
}
/* static */ nsINode* TextDirectiveUtil::GetBlockAncestorForNode(
nsINode* aNode) {
// 1. Let curNode be node.
RefPtr<nsINode> curNode = aNode;
// 2. While curNode is non-null
while (curNode) {
// 2.1. If curNode is not a Text node and it has block-level display then
// return curNode.
if (!curNode->IsText() && NodeHasBlockLevelDisplay(*curNode)) {
return curNode;
}
// 2.2. Otherwise, set curNode to curNode’s parent.
curNode = curNode->GetParentNode();
}
// 3.Return node’s node document's document element.
return aNode->GetOwnerDocument();
}
/* static */ bool TextDirectiveUtil::NodeIsPartOfNonSearchableSubTree(
nsINode& aNode) {
nsINode* node = &aNode;
do {
if (NodeIsSearchInvisible(*node)) {
return true;
}
} while ((node = node->GetParentOrShadowHostNode()));
return false;
}
/* static */ bool TextDirectiveUtil::IsAtWordBoundary(const nsAString& aText,
uint32_t aPosition) {
const intl::WordRange wordRange =
intl::WordBreaker::FindWord(aText, aPosition);
return wordRange.mBegin == aPosition || wordRange.mEnd == aPosition;
}
/* static */ RangeBoundary TextDirectiveUtil::GetBoundaryPointAtIndex(
uint32_t aIndex, const nsTArray<RefPtr<Text>>& aTextNodeList,
IsEndIndex aIsEndIndex) {
// 1. Let counted be 0.
uint32_t counted = 0;
// 2. For each curNode of nodes:
for (Text* curNode : aTextNodeList) {
// 2.1. Let nodeEnd be counted + curNode’s length.
uint32_t nodeEnd = counted + curNode->Length();
// 2.2. If isEnd is true, add 1 to nodeEnd.
if (aIsEndIndex == IsEndIndex::Yes) {
++nodeEnd;
}
// 2.3. If nodeEnd is greater than index then:
if (nodeEnd > aIndex) {
// 2.3.1. Return the boundary point (curNode, index − counted).
return RangeBoundary(curNode->AsNode(), aIndex - counted);
}
// 2.4. Increment counted by curNode’s length.
counted += curNode->Length();
}
return {};
}
/* static */ void TextDirectiveUtil::AdvanceStartToNextNonWhitespacePosition(
nsRange& aRange) {
// 1. While range is not collapsed:
while (!aRange.Collapsed()) {
// 1.1. Let node be range's start node.
RefPtr<nsINode> node = aRange.GetStartContainer();
MOZ_ASSERT(node);
// 1.2. Let offset be range's start offset.
const uint32_t offset = aRange.StartOffset();
// 1.3. If node is part of a non-searchable subtree or if node is not a
// visible text node or if offset is equal to node's length then:
if (NodeIsPartOfNonSearchableSubTree(*node) ||
!NodeIsVisibleTextNode(*node) || offset == node->Length()) {
// 1.3.1. Set range's start node to the next node, in shadow-including
// tree order.
// 1.3.2. Set range's start offset to 0.
if (NS_FAILED(aRange.SetStart(node->GetNextNode(), 0))) {
return;
}
// 1.3.3. Continue.
continue;
}
const Text* text = Text::FromNode(node);
MOZ_ASSERT(text);
// These steps are moved to `IsWhitespaceAtPosition()`.
// 1.4. If the substring data of node at offset offset and count 6 is equal
// to the string " " then:
// 1.4.1. Add 6 to range’s start offset.
// 1.5. Otherwise, if the substring data of node at offset offset and count
// 5 is equal to the string " " then:
// 1.5.1. Add 5 to range’s start offset.
// 1.6. Otherwise:
// 1.6.1 Let cp be the code point at the offset index in node’s data.
// 1.6.2 If cp does not have the White_Space property set, return.
// 1.6.3 Add 1 to range’s start offset.
if (!IsWhitespaceAtPosition(text, offset)) {
return;
}
aRange.SetStart(node, offset + 1);
}
}
/* static */ RangeBoundary
TextDirectiveUtil::MoveBoundaryToNextNonWhitespacePosition(
const RangeBoundary& aRangeBoundary) {
MOZ_ASSERT(aRangeBoundary.IsSetAndValid());
nsINode* node = aRangeBoundary.GetContainer();
uint32_t offset =
*aRangeBoundary.Offset(RangeBoundary::OffsetFilter::kValidOffsets);
while (node) {
if (TextDirectiveUtil::NodeIsPartOfNonSearchableSubTree(*node) ||
!TextDirectiveUtil::NodeIsVisibleTextNode(*node) ||
offset == node->Length()) {
nsINode* newNode = node->GetNextNode();
if (!newNode) {
// jjaschke: I don't see a situation where this could happen. However,
// let's return the original range boundary as fallback.
return aRangeBoundary;
}
node = newNode;
offset = 0;
continue;
}
const Text* text = Text::FromNode(node);
MOZ_ASSERT(text);
if (TextDirectiveUtil::IsWhitespaceAtPosition(text, offset)) {
++offset;
continue;
}
return {node, offset};
}
MOZ_ASSERT_UNREACHABLE("All code paths must return in the loop.");
return {};
}
/* static */ RangeBoundary
TextDirectiveUtil::MoveBoundaryToPreviousNonWhitespacePosition(
const RangeBoundary& aRangeBoundary) {
MOZ_ASSERT(aRangeBoundary.IsSetAndValid());
nsINode* node = aRangeBoundary.GetContainer();
uint32_t offset =
*aRangeBoundary.Offset(RangeBoundary::OffsetFilter::kValidOffsets);
// Decrement offset by one so that the actual previous character is used. This
// means that we need to increment the offset by 1 when we have found the
// non-whitespace character.
while (node) {
if (TextDirectiveUtil::NodeIsPartOfNonSearchableSubTree(*node) ||
!TextDirectiveUtil::NodeIsVisibleTextNode(*node) || offset == 0) {
nsIContent* newNode = node->GetPrevNode();
if (!newNode) {
// jjaschke: I don't see a situation where this could happen. However,
// let's return the original range boundary as fallback.
return aRangeBoundary;
}
node = newNode;
offset = node->Length();
continue;
}
const Text* text = Text::FromNode(node);
MOZ_ASSERT(text);
if (TextDirectiveUtil::IsWhitespaceAtPosition(text, offset - 1)) {
--offset;
continue;
}
return {node, offset};
}
MOZ_ASSERT_UNREACHABLE("All code paths must return in the loop.");
return {};
}
/* static */ Result<RangeBoundary, ErrorResult>
TextDirectiveUtil::FindNextBlockBoundary(const RangeBoundary& aRangeBoundary,
TextScanDirection aDirection) {
MOZ_ASSERT(aRangeBoundary.IsSetAndValid());
auto findNextBlockBoundaryInternal =
[aDirection](const RangeBoundary& rangeBoundary)
-> Result<RangeBoundary, ErrorResult> {
PeekOffsetOptions options = {
PeekOffsetOption::JumpLines, PeekOffsetOption::StopAtScroller,
PeekOffsetOption::IsKeyboardSelect, PeekOffsetOption::Extend};
return SelectionMovementUtils::MoveRangeBoundaryToSomewhere(
rangeBoundary,
aDirection == TextScanDirection::Left ? nsDirection::eDirPrevious
: nsDirection::eDirNext,
CaretAssociationHint::After,
intl::BidiEmbeddingLevel::DefaultLTR(),
nsSelectionAmount::eSelectParagraph, options)
.mapErr([](nsresult rv) { return ErrorResult(rv); });
};
auto maybeNewBoundary = findNextBlockBoundaryInternal(aRangeBoundary);
if (MOZ_UNLIKELY(maybeNewBoundary.isErr())) {
return maybeNewBoundary.propagateErr();
}
auto newBoundary = maybeNewBoundary.unwrap();
while (NormalizedRangeBoundariesAreEqual(aRangeBoundary, newBoundary)) {
maybeNewBoundary = findNextBlockBoundaryInternal(newBoundary);
if (MOZ_UNLIKELY(maybeNewBoundary.isErr())) {
return maybeNewBoundary.propagateErr();
}
if (maybeNewBoundary.inspect() == newBoundary) {
return newBoundary; // we reached the end or so?
}
newBoundary = maybeNewBoundary.unwrap();
}
return newBoundary;
}
/* static */ Result<Maybe<RangeBoundary>, ErrorResult>
TextDirectiveUtil::FindBlockBoundaryInRange(const nsRange& aRange,
TextScanDirection aDirection) {
if (aRange.Collapsed()) {
return Result<Maybe<RangeBoundary>, ErrorResult>(Nothing{});
}
if (aDirection == TextScanDirection::Right) {
Result<RangeBoundary, ErrorResult> maybeBoundary =
FindNextBlockBoundary(aRange.StartRef(), TextScanDirection::Right);
if (MOZ_UNLIKELY(maybeBoundary.isErr())) {
return maybeBoundary.propagateErr();
}
RangeBoundary boundary = maybeBoundary.unwrap();
Maybe<int32_t> compare =
nsContentUtils::ComparePoints(boundary, aRange.EndRef());
if (!compare || *compare != -1) {
// *compare == -1 means that the found block boundary is after the range
// end, and therefore outside of the range.
return Result<Maybe<RangeBoundary>, ErrorResult>(Nothing{});
}
return Some(boundary);
}
Result<RangeBoundary, ErrorResult> maybeBoundary =
FindNextBlockBoundary(aRange.EndRef(), TextScanDirection::Left);
if (MOZ_UNLIKELY(maybeBoundary.isErr())) {
return maybeBoundary.propagateErr();
}
RangeBoundary boundary = maybeBoundary.unwrap();
auto compare = nsContentUtils::ComparePoints(aRange.StartRef(), boundary);
if (!compare || *compare != -1) {
// *compare == 1 means that the found block boundary is before the range
// start boundary, and therefore outside of the range.
return Result<Maybe<RangeBoundary>, ErrorResult>(Nothing{});
}
return Some(boundary);
}
/* static */ bool TextDirectiveUtil::NormalizedRangeBoundariesAreEqual(
const RangeBoundary& aRangeBoundary1, const RangeBoundary& aRangeBoundary2,
nsContentUtils::NodeIndexCache* aCache /* = nullptr */) {
MOZ_ASSERT(aRangeBoundary1.IsSetAndValid() &&
aRangeBoundary2.IsSetAndValid());
if (aRangeBoundary1 == aRangeBoundary2) {
return true;
}
auto textSubStringIsOnlyWhitespace =
[](const Text* textNode, uint32_t startIndex, uint32_t endIndex) {
MOZ_ASSERT(textNode);
if (startIndex > endIndex) {
std::swap(startIndex, endIndex);
}
MOZ_ASSERT(startIndex < textNode->Length());
if (startIndex == endIndex) {
return true;
}
const nsTextFragment& textFragment = textNode->TextFragment();
for (uint32_t i = startIndex; i < endIndex; ++i) {
char16_t ch = textFragment.CharAt(i);
if (!nsContentUtils::IsHTMLWhitespaceOrNBSP(ch)) {
return false;
}
}
return true;
};
const nsINode* node1 = aRangeBoundary1.GetContainer();
const nsINode* node2 = aRangeBoundary2.GetContainer();
size_t offset1 =
*aRangeBoundary1.Offset(RangeBoundary::OffsetFilter::kValidOffsets);
size_t offset2 =
*aRangeBoundary2.Offset(RangeBoundary::OffsetFilter::kValidOffsets);
if (node1 == node2) {
if (const Text* text = Text::FromNodeOrNull(node1)) {
return textSubStringIsOnlyWhitespace(text, offset1, offset2);
}
return offset1 == offset2;
}
mozilla::UnsafePreContentIterator iter;
// ContentIterator classes require boundaries to be in correct order.
auto comp =
nsContentUtils::ComparePoints(aRangeBoundary1, aRangeBoundary2, aCache);
if (!comp) {
return false;
}
if (*comp == 0) {
return true;
}
const auto& [firstBoundary, secondBoundary] =
*comp == -1 ? std::tuple{&aRangeBoundary1, &aRangeBoundary2}
: std::tuple{&aRangeBoundary2, &aRangeBoundary1};
if (NS_FAILED(iter.InitWithoutValidatingPoints(firstBoundary->AsRaw(),
secondBoundary->AsRaw()))) {
return false;
}
for (; !iter.IsDone(); iter.Next()) {
auto* node = iter.GetCurrentNode();
if (!node || !TextDirectiveUtil::NodeIsVisibleTextNode(*node)) {
continue;
}
if (node == firstBoundary->GetContainer()) {
auto firstOffset =
*firstBoundary->Offset(RangeBoundary::OffsetFilter::kValidOffsets);
if (firstOffset == node->Length()) {
// if this is the start node, it's a text node and the offset is at the
// end, continue with the next node.
continue;
}
if (const Text* text = Text::FromNodeOrNull(node)) {
if (textSubStringIsOnlyWhitespace(text, firstOffset, text->Length())) {
continue;
}
}
}
if (node == secondBoundary->GetContainer()) {
auto secondOffset =
*secondBoundary->Offset(RangeBoundary::OffsetFilter::kValidOffsets);
if (secondOffset == 0) {
// if this is the end node, it's a text node and the offset is 0, return
// true.
return true;
}
if (const Text* text = Text::FromNodeOrNull(node)) {
if (textSubStringIsOnlyWhitespace(text, 0, secondOffset)) {
return true;
}
}
}
if (node->Length() && !node->AsText()->TextIsOnlyWhitespace()) {
// if the text node only contains whitespace, ignore it; otherwise, the
// boundaries are not at the same spot.
return false;
}
}
return true;
}
/* static */ Result<Ok, ErrorResult>
TextDirectiveUtil::ExtendRangeToWordBoundaries(nsRange& aRange) {
MOZ_ASSERT(!aRange.Collapsed());
PeekOffsetOptions options = {
PeekOffsetOption::JumpLines, PeekOffsetOption::StopAtScroller,
PeekOffsetOption::IsKeyboardSelect, PeekOffsetOption::Extend};
// To extend a range `inputRange` to its word boundaries, perform these steps:
// 1. To extend the start boundary:
// 1.1 Let `newStartBoundary` be a range boundary, initially null.
// 1.2 Create a new range boundary `rangeStartWordEndBoundary` at the next
// word end boundary at `inputRange`s start point.
// 1.3 Then, create a new range boundary `rangeStartWordStartBoundary`
// at the previous word start boundary of `rangeStartWordEndBoundary`
// 1.4 If `rangeStartWordStartBoundary` is not at the same (normalized)
// position as `inputRange`s start point, let `newStartBoundary` be
// `rangeStartWordStartBoundary`.
Result<Maybe<RangeBoundary>, ErrorResult> newStartBoundary =
SelectionMovementUtils::MoveRangeBoundaryToSomewhere(
aRange.StartRef(), nsDirection::eDirNext, CaretAssociationHint::After,
intl::BidiEmbeddingLevel::DefaultLTR(),
nsSelectionAmount::eSelectWord, options)
.andThen([&options](const RangeBoundary& rangeStartWordEndBoundary) {
return SelectionMovementUtils::MoveRangeBoundaryToSomewhere(
rangeStartWordEndBoundary, nsDirection::eDirPrevious,
CaretAssociationHint::Before,
intl::BidiEmbeddingLevel::DefaultLTR(),
nsSelectionAmount::eSelectWord, options);
})
.map([&rangeStart = aRange.StartRef()](
RangeBoundary&& rangeStartWordStartBoundary) {
return NormalizedRangeBoundariesAreEqual(
rangeStartWordStartBoundary, rangeStart)
? Nothing{}
: Some(std::move(rangeStartWordStartBoundary));
})
.mapErr([](nsresult rv) { return ErrorResult(rv); });
if (MOZ_UNLIKELY(newStartBoundary.isErr())) {
return newStartBoundary.propagateErr();
}
// 2. To extend the end boundary:
// 2.1 Let `newEndBoundary` be a range boundary, initially null.
// 2.2 Create a new range boundary `rangeEndWordStartBoundary` at the previous
// word start boundary at `inputRange`s end point.
// 2.3 Then, create a new range boundary `rangeEndWordEndBoundary` at the next
// word end boundary from `rangeEndWordStartBoundary`.
// 2.4 If `rangeEndWordEndBoundary` is not at the same (normalized) position
// as `inputRange`s end point, let `newEndBoundary` be
// `rangEndWordEndBoundary`.
Result<Maybe<RangeBoundary>, ErrorResult> newEndBoundary =
SelectionMovementUtils::MoveRangeBoundaryToSomewhere(
aRange.EndRef(), nsDirection::eDirPrevious,
CaretAssociationHint::Before, intl::BidiEmbeddingLevel::DefaultLTR(),
nsSelectionAmount::eSelectWord, options)
.andThen([&options](const RangeBoundary& rangeEndWordStartBoundary) {
return SelectionMovementUtils::MoveRangeBoundaryToSomewhere(
rangeEndWordStartBoundary, nsDirection::eDirNext,
CaretAssociationHint::After,
intl::BidiEmbeddingLevel::DefaultLTR(),
nsSelectionAmount::eSelectWord, options);
})
.map([&rangeEnd =
aRange.EndRef()](RangeBoundary&& rangeEndWordEndBoundary) {
return NormalizedRangeBoundariesAreEqual(rangeEndWordEndBoundary,
rangeEnd)
? Nothing{}
: Some(std::move(rangeEndWordEndBoundary));
})
.mapErr([](auto rv) { return ErrorResult(rv); });
if (MOZ_UNLIKELY(newEndBoundary.isErr())) {
return newEndBoundary.propagateErr();
}
// 3. If `newStartBoundary` is not null, set `inputRange`s start point to
// `newStartBoundary`.
MOZ_TRY(newStartBoundary.andThen(
[&aRange](Maybe<RangeBoundary>&& boundary) -> Result<Ok, ErrorResult> {
if (boundary.isNothing() || !boundary->IsSetAndValid()) {
return Ok();
}
ErrorResult rv;
aRange.SetStart(boundary->AsRaw(), rv);
if (MOZ_UNLIKELY(rv.Failed())) {
return Err(std::move(rv));
}
return Ok();
}));
// 4. If `newEndBoundary` is not null, set `inputRange`s end point to
// `newEndBoundary`.
MOZ_TRY(newEndBoundary.andThen(
[&aRange](Maybe<RangeBoundary>&& boundary) -> Result<Ok, ErrorResult> {
if (boundary.isNothing() || !boundary->IsSetAndValid()) {
return Ok();
}
ErrorResult rv;
aRange.SetEnd(boundary->AsRaw(), rv);
if (MOZ_UNLIKELY(rv.Failed())) {
return Err(std::move(rv));
}
return Ok();
}));
return Ok();
}
/* static */
Result<TextDirective, ErrorResult>
TextDirectiveUtil::CreateTextDirectiveFromRanges(nsRange* aPrefix,
nsRange* aStart, nsRange* aEnd,
nsRange* aSuffix) {
MOZ_ASSERT(aStart && !aStart->Collapsed());
ErrorResult rv;
TextDirective textDirective;
MOZ_TRY(RangeContentAsString(aStart).andThen(
[&textDirective](nsString start) -> Result<Ok, ErrorResult> {
textDirective.start = std::move(start);
return Ok();
}));
MOZ_TRY(RangeContentAsString(aPrefix).andThen(
[&textDirective](nsString prefix) -> Result<Ok, ErrorResult> {
textDirective.prefix = std::move(prefix);
return Ok();
}));
MOZ_TRY(RangeContentAsString(aEnd).andThen(
[&textDirective](nsString end) -> Result<Ok, ErrorResult> {
textDirective.end = std::move(end);
return Ok();
}));
MOZ_TRY(RangeContentAsString(aSuffix).andThen(
[&textDirective](nsString suffix) -> Result<Ok, ErrorResult> {
textDirective.suffix = std::move(suffix);
return Ok();
}));
return textDirective;
}
uint32_t TextDirectiveUtil::FindCommonPrefix(const nsAString& aFoldedStr1,
const nsAString& aFoldedStr2) {
const uint32_t maxCommonLength =
std::min(aFoldedStr1.Length(), aFoldedStr2.Length());
uint32_t commonLength = 0;
const char16_t* iter1 = aFoldedStr1.BeginReading();
const char16_t* iter2 = aFoldedStr2.BeginReading();
while (commonLength < maxCommonLength) {
if (*iter1 != *iter2) {
break;
}
++iter1;
++iter2;
++commonLength;
}
// this condition ensures that if the high surrogate is removed if the low
// surrogate does not match.
if (commonLength && NS_IS_HIGH_SURROGATE(*(iter1 - 1))) {
--commonLength;
}
return commonLength;
}
uint32_t TextDirectiveUtil::FindCommonSuffix(const nsAString& aFoldedStr1,
const nsAString& aFoldedStr2) {
const uint32_t maxCommonLength =
std::min(aFoldedStr1.Length(), aFoldedStr2.Length());
uint32_t commonLength = 0;
const char16_t* iter1 = aFoldedStr1.EndReading();
const char16_t* iter2 = aFoldedStr2.EndReading();
while (commonLength != maxCommonLength) {
if (*(iter1 - 1) != *(iter2 - 1)) {
break;
}
--iter1;
--iter2;
++commonLength;
}
// this condition ensures that a matching low surrogate is removed if the high
// surrogate does not match.
if (commonLength && NS_IS_LOW_SURROGATE(*iter1)) {
--commonLength;
}
return commonLength;
}
RangeBoundary
TextDirectiveUtil::CreateRangeBoundaryByMovingOffsetFromRangeStart(
nsRange* aRange, uint32_t aLogicalOffset) {
MOZ_ASSERT(!aRange->Collapsed());
nsINode* node = aRange->GetStartContainer();
uint32_t startOffset = aRange->StartOffset();
uint32_t remaining = startOffset + aLogicalOffset;
while (node && remaining) {
if (NodeIsPartOfNonSearchableSubTree(*node) ||
!NodeIsVisibleTextNode(*node)) {
node = node->GetNextNode();
continue;
}
MOZ_ASSERT_IF(node == aRange->GetEndContainer(),
remaining <= node->Length());
if (node->Length() <= remaining) {
remaining -= node->Length();
node = node->GetNextNode();
continue;
}
return {node, remaining};
}
return {node, remaining};
}
} // namespace mozilla::dom