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gecko-dev/editor/libeditor/HTMLEditorState.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=80: */
/* 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "HTMLEditor.h"
#include <algorithm>
#include <utility>
#include "HTMLEditUtils.h"
#include "WSRunObject.h"
#include "mozilla/Assertions.h"
#include "mozilla/CSSEditUtils.h"
#include "mozilla/EditAction.h"
#include "mozilla/EditorUtils.h"
#include "mozilla/OwningNonNull.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Selection.h"
#include "nsAString.h"
#include "nsAlgorithm.h"
#include "nsAtom.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsINode.h"
#include "nsRange.h"
#include "nsString.h"
#include "nsStringFwd.h"
#include "nsTArray.h"
// NOTE: This file was split from:
// https://searchfox.org/mozilla-central/rev/c409dd9235c133ab41eba635f906aa16e050c197/editor/libeditor/HTMLEditSubActionHandler.cpp
namespace mozilla {
using EditorType = EditorUtils::EditorType;
using WalkTreeOption = HTMLEditUtils::WalkTreeOption;
/*****************************************************************************
* ListElementSelectionState
****************************************************************************/
ListElementSelectionState::ListElementSelectionState(HTMLEditor& aHTMLEditor,
ErrorResult& aRv) {
MOZ_ASSERT(!aRv.Failed());
if (NS_WARN_IF(aHTMLEditor.Destroyed())) {
aRv.Throw(NS_ERROR_EDITOR_DESTROYED);
return;
}
// XXX Should we create another constructor which won't create
// AutoEditActionDataSetter? Or should we create another
// AutoEditActionDataSetter which won't nest edit action?
EditorBase::AutoEditActionDataSetter editActionData(aHTMLEditor,
EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
aRv = EditorBase::ToGenericNSResult(NS_ERROR_EDITOR_DESTROYED);
return;
}
AutoTArray<OwningNonNull<nsIContent>, 64> arrayOfContents;
nsresult rv = aHTMLEditor.CollectEditTargetNodesInExtendedSelectionRanges(
arrayOfContents, EditSubAction::eCreateOrChangeList,
HTMLEditor::CollectNonEditableNodes::No);
if (NS_FAILED(rv)) {
NS_WARNING(
"HTMLEditor::CollectEditTargetNodesInExtendedSelectionRanges("
"eCreateOrChangeList, CollectNonEditableNodes::No) failed");
aRv = EditorBase::ToGenericNSResult(rv);
return;
}
// Examine list type for nodes in selection.
for (const auto& content : arrayOfContents) {
if (!content->IsElement()) {
mIsOtherContentSelected = true;
} else if (content->IsHTMLElement(nsGkAtoms::ul)) {
mIsULElementSelected = true;
} else if (content->IsHTMLElement(nsGkAtoms::ol)) {
mIsOLElementSelected = true;
} else if (content->IsHTMLElement(nsGkAtoms::li)) {
if (dom::Element* parent = content->GetParentElement()) {
if (parent->IsHTMLElement(nsGkAtoms::ul)) {
mIsULElementSelected = true;
} else if (parent->IsHTMLElement(nsGkAtoms::ol)) {
mIsOLElementSelected = true;
}
}
} else if (content->IsAnyOfHTMLElements(nsGkAtoms::dl, nsGkAtoms::dt,
nsGkAtoms::dd)) {
mIsDLElementSelected = true;
} else {
mIsOtherContentSelected = true;
}
if (mIsULElementSelected && mIsOLElementSelected && mIsDLElementSelected &&
mIsOtherContentSelected) {
break;
}
}
}
/*****************************************************************************
* ListItemElementSelectionState
****************************************************************************/
ListItemElementSelectionState::ListItemElementSelectionState(
HTMLEditor& aHTMLEditor, ErrorResult& aRv) {
MOZ_ASSERT(!aRv.Failed());
if (NS_WARN_IF(aHTMLEditor.Destroyed())) {
aRv.Throw(NS_ERROR_EDITOR_DESTROYED);
return;
}
// XXX Should we create another constructor which won't create
// AutoEditActionDataSetter? Or should we create another
// AutoEditActionDataSetter which won't nest edit action?
EditorBase::AutoEditActionDataSetter editActionData(aHTMLEditor,
EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
aRv = EditorBase::ToGenericNSResult(NS_ERROR_EDITOR_DESTROYED);
return;
}
AutoTArray<OwningNonNull<nsIContent>, 64> arrayOfContents;
nsresult rv = aHTMLEditor.CollectEditTargetNodesInExtendedSelectionRanges(
arrayOfContents, EditSubAction::eCreateOrChangeList,
HTMLEditor::CollectNonEditableNodes::No);
if (NS_FAILED(rv)) {
NS_WARNING(
"HTMLEditor::CollectEditTargetNodesInExtendedSelectionRanges("
"eCreateOrChangeList, CollectNonEditableNodes::No) failed");
aRv = EditorBase::ToGenericNSResult(rv);
return;
}
// examine list type for nodes in selection
for (const auto& content : arrayOfContents) {
if (!content->IsElement()) {
mIsOtherElementSelected = true;
} else if (content->IsAnyOfHTMLElements(nsGkAtoms::ul, nsGkAtoms::ol,
nsGkAtoms::li)) {
mIsLIElementSelected = true;
} else if (content->IsHTMLElement(nsGkAtoms::dt)) {
mIsDTElementSelected = true;
} else if (content->IsHTMLElement(nsGkAtoms::dd)) {
mIsDDElementSelected = true;
} else if (content->IsHTMLElement(nsGkAtoms::dl)) {
if (mIsDTElementSelected && mIsDDElementSelected) {
continue;
}
// need to look inside dl and see which types of items it has
DefinitionListItemScanner scanner(*content->AsElement());
mIsDTElementSelected |= scanner.DTElementFound();
mIsDDElementSelected |= scanner.DDElementFound();
} else {
mIsOtherElementSelected = true;
}
if (mIsLIElementSelected && mIsDTElementSelected && mIsDDElementSelected &&
mIsOtherElementSelected) {
break;
}
}
}
/*****************************************************************************
* AlignStateAtSelection
****************************************************************************/
AlignStateAtSelection::AlignStateAtSelection(HTMLEditor& aHTMLEditor,
ErrorResult& aRv) {
MOZ_ASSERT(!aRv.Failed());
if (NS_WARN_IF(aHTMLEditor.Destroyed())) {
aRv = EditorBase::ToGenericNSResult(NS_ERROR_EDITOR_DESTROYED);
return;
}
// XXX Should we create another constructor which won't create
// AutoEditActionDataSetter? Or should we create another
// AutoEditActionDataSetter which won't nest edit action?
EditorBase::AutoEditActionDataSetter editActionData(aHTMLEditor,
EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
aRv = EditorBase::ToGenericNSResult(NS_ERROR_EDITOR_DESTROYED);
return;
}
if (aHTMLEditor.IsSelectionRangeContainerNotContent()) {
NS_WARNING("Some selection containers are not content node, but ignored");
return;
}
// For now, just return first alignment. We don't check if it's mixed.
// This is for efficiency given that our current UI doesn't care if it's
// mixed.
// cmanske: NOT TRUE! We would like to pay attention to mixed state in
// [Format] -> [Align] submenu!
// This routine assumes that alignment is done ONLY by `<div>` elements
// if aHTMLEditor is not in CSS mode.
if (NS_WARN_IF(!aHTMLEditor.GetRoot())) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
OwningNonNull<dom::Element> bodyOrDocumentElement = *aHTMLEditor.GetRoot();
EditorRawDOMPoint atBodyOrDocumentElement(bodyOrDocumentElement);
const nsRange* firstRange = aHTMLEditor.SelectionRef().GetRangeAt(0);
mFoundSelectionRanges = !!firstRange;
if (!mFoundSelectionRanges) {
NS_WARNING("There was no selection range");
aRv.Throw(NS_ERROR_FAILURE);
return;
}
EditorRawDOMPoint atStartOfSelection(firstRange->StartRef());
if (NS_WARN_IF(!atStartOfSelection.IsSet())) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
MOZ_ASSERT(atStartOfSelection.IsSetAndValid());
nsIContent* editTargetContent = nullptr;
// If selection is collapsed or in a text node, take the container.
if (aHTMLEditor.SelectionRef().IsCollapsed() ||
atStartOfSelection.IsInTextNode()) {
editTargetContent = atStartOfSelection.GetContainerAsContent();
if (NS_WARN_IF(!editTargetContent)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
}
// If selection container is the `<body>` element which is set to
// `HTMLDocument.body`, take first editable node in it.
// XXX Why don't we just compare `atStartOfSelection.GetChild()` and
// `bodyOrDocumentElement`? Then, we can avoid computing the
// offset.
else if (atStartOfSelection.IsContainerHTMLElement(nsGkAtoms::html) &&
atBodyOrDocumentElement.IsSet() &&
atStartOfSelection.Offset() == atBodyOrDocumentElement.Offset()) {
editTargetContent = HTMLEditUtils::GetNextContent(
atStartOfSelection, {WalkTreeOption::IgnoreNonEditableNode},
aHTMLEditor.GetActiveEditingHost());
if (NS_WARN_IF(!editTargetContent)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
}
// Otherwise, use first selected node.
// XXX Only for retreiving it, the following block treats all selected
// ranges. `HTMLEditor` should have
// `GetFirstSelectionRangeExtendedToHardLineStartAndEnd()`.
else {
AutoTArray<RefPtr<nsRange>, 4> arrayOfRanges;
aHTMLEditor.GetSelectionRangesExtendedToHardLineStartAndEnd(
arrayOfRanges, EditSubAction::eSetOrClearAlignment);
AutoTArray<OwningNonNull<nsIContent>, 64> arrayOfContents;
nsresult rv = aHTMLEditor.CollectEditTargetNodes(
arrayOfRanges, arrayOfContents, EditSubAction::eSetOrClearAlignment,
HTMLEditor::CollectNonEditableNodes::Yes);
if (NS_FAILED(rv)) {
NS_WARNING(
"HTMLEditor::CollectEditTargetNodes(eSetOrClearAlignment, "
"CollectNonEditableNodes::Yes) failed");
aRv.Throw(NS_ERROR_FAILURE);
return;
}
if (arrayOfContents.IsEmpty()) {
NS_WARNING(
"HTMLEditor::CollectEditTargetNodes(eSetOrClearAlignment, "
"CollectNonEditableNodes::Yes) returned no contents");
aRv.Throw(NS_ERROR_FAILURE);
return;
}
editTargetContent = arrayOfContents[0];
}
const RefPtr<dom::Element> maybeNonEditableBlockElement =
HTMLEditUtils::GetInclusiveAncestorElement(
*editTargetContent, HTMLEditUtils::ClosestBlockElement);
if (NS_WARN_IF(!maybeNonEditableBlockElement)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
if (aHTMLEditor.IsCSSEnabled() &&
CSSEditUtils::IsCSSEditableProperty(maybeNonEditableBlockElement, nullptr,
nsGkAtoms::align)) {
// We are in CSS mode and we know how to align this element with CSS
nsAutoString value;
// Let's get the value(s) of text-align or margin-left/margin-right
DebugOnly<nsresult> rvIgnored =
CSSEditUtils::GetComputedCSSEquivalentToHTMLInlineStyleSet(
*maybeNonEditableBlockElement, nullptr, nsGkAtoms::align, value);
if (NS_WARN_IF(aHTMLEditor.Destroyed())) {
aRv.Throw(NS_ERROR_EDITOR_DESTROYED);
return;
}
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::GetComputedCSSEquivalentToHTMLInlineStyleSet(nsGkAtoms::"
"align, "
"eComputed) failed, but ignored");
if (value.EqualsLiteral("center") || value.EqualsLiteral("-moz-center") ||
value.EqualsLiteral("auto auto")) {
mFirstAlign = nsIHTMLEditor::eCenter;
return;
}
if (value.EqualsLiteral("right") || value.EqualsLiteral("-moz-right") ||
value.EqualsLiteral("auto 0px")) {
mFirstAlign = nsIHTMLEditor::eRight;
return;
}
if (value.EqualsLiteral("justify")) {
mFirstAlign = nsIHTMLEditor::eJustify;
return;
}
// XXX In RTL document, is this expected?
mFirstAlign = nsIHTMLEditor::eLeft;
return;
}
for (nsIContent* containerContent :
editTargetContent->InclusiveAncestorsOfType<nsIContent>()) {
// If the node is a parent `<table>` element of edit target, let's break
// here to materialize the 'inline-block' behaviour of html tables
// regarding to text alignment.
if (containerContent != editTargetContent &&
containerContent->IsHTMLElement(nsGkAtoms::table)) {
return;
}
if (CSSEditUtils::IsCSSEditableProperty(containerContent, nullptr,
nsGkAtoms::align)) {
nsAutoString value;
DebugOnly<nsresult> rvIgnored = CSSEditUtils::GetSpecifiedProperty(
*containerContent, *nsGkAtoms::textAlign, value);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::GetSpecifiedProperty(nsGkAtoms::"
"textAlign) failed, but ignored");
if (!value.IsEmpty()) {
if (value.EqualsLiteral("center")) {
mFirstAlign = nsIHTMLEditor::eCenter;
return;
}
if (value.EqualsLiteral("right")) {
mFirstAlign = nsIHTMLEditor::eRight;
return;
}
if (value.EqualsLiteral("justify")) {
mFirstAlign = nsIHTMLEditor::eJustify;
return;
}
if (value.EqualsLiteral("left")) {
mFirstAlign = nsIHTMLEditor::eLeft;
return;
}
// XXX
// text-align: start and end aren't supported yet
}
}
if (!HTMLEditUtils::SupportsAlignAttr(*containerContent)) {
continue;
}
nsAutoString alignAttributeValue;
containerContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::align,
alignAttributeValue);
if (alignAttributeValue.IsEmpty()) {
continue;
}
if (alignAttributeValue.LowerCaseEqualsASCII("center")) {
mFirstAlign = nsIHTMLEditor::eCenter;
return;
}
if (alignAttributeValue.LowerCaseEqualsASCII("right")) {
mFirstAlign = nsIHTMLEditor::eRight;
return;
}
// XXX This is odd case. `<div align="justify">` is not in any standards.
if (alignAttributeValue.LowerCaseEqualsASCII("justify")) {
mFirstAlign = nsIHTMLEditor::eJustify;
return;
}
// XXX In RTL document, is this expected?
mFirstAlign = nsIHTMLEditor::eLeft;
return;
}
}
/*****************************************************************************
* ParagraphStateAtSelection
****************************************************************************/
ParagraphStateAtSelection::ParagraphStateAtSelection(HTMLEditor& aHTMLEditor,
ErrorResult& aRv) {
if (NS_WARN_IF(aHTMLEditor.Destroyed())) {
aRv = EditorBase::ToGenericNSResult(NS_ERROR_EDITOR_DESTROYED);
return;
}
// XXX Should we create another constructor which won't create
// AutoEditActionDataSetter? Or should we create another
// AutoEditActionDataSetter which won't nest edit action?
EditorBase::AutoEditActionDataSetter editActionData(aHTMLEditor,
EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
aRv = EditorBase::ToGenericNSResult(NS_ERROR_EDITOR_DESTROYED);
return;
}
if (aHTMLEditor.IsSelectionRangeContainerNotContent()) {
NS_WARNING("Some selection containers are not content node, but ignored");
return;
}
AutoTArray<OwningNonNull<nsIContent>, 64> arrayOfContents;
nsresult rv =
CollectEditableFormatNodesInSelection(aHTMLEditor, arrayOfContents);
if (NS_FAILED(rv)) {
NS_WARNING(
"ParagraphStateAtSelection::CollectEditableFormatNodesInSelection() "
"failed");
aRv.Throw(rv);
return;
}
// We need to append descendant format block if block nodes are not format
// block. This is so we only have to look "up" the hierarchy to find
// format nodes, instead of both up and down.
for (int32_t i = arrayOfContents.Length() - 1; i >= 0; i--) {
auto& content = arrayOfContents[i];
nsAutoString format;
if (HTMLEditUtils::IsBlockElement(content) &&
!HTMLEditUtils::IsFormatNode(content)) {
// XXX This RemoveObject() call has already been commented out and
// the above comment explained we're trying to replace non-format
// block nodes in the array. According to the following blocks and
// `AppendDescendantFormatNodesAndFirstInlineNode()`, replacing
// non-format block with descendants format blocks makes sense.
// arrayOfContents.RemoveObject(node);
ParagraphStateAtSelection::AppendDescendantFormatNodesAndFirstInlineNode(
arrayOfContents, *content->AsElement());
}
}
// We might have an empty node list. if so, find selection parent
// and put that on the list
if (arrayOfContents.IsEmpty()) {
EditorRawDOMPoint atCaret(
EditorBase::GetStartPoint(aHTMLEditor.SelectionRef()));
if (NS_WARN_IF(!atCaret.IsSet())) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
nsIContent* content = atCaret.GetContainerAsContent();
if (NS_WARN_IF(!content)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
arrayOfContents.AppendElement(*content);
}
dom::Element* bodyOrDocumentElement = aHTMLEditor.GetRoot();
if (NS_WARN_IF(!bodyOrDocumentElement)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
for (auto& content : Reversed(arrayOfContents)) {
nsAtom* paragraphStateOfNode = nsGkAtoms::_empty;
if (HTMLEditUtils::IsFormatNode(content)) {
MOZ_ASSERT(content->NodeInfo()->NameAtom());
paragraphStateOfNode = content->NodeInfo()->NameAtom();
}
// Ignore non-format block node since its children have been appended
// the list above so that we'll handle this descendants later.
else if (HTMLEditUtils::IsBlockElement(content)) {
continue;
}
// If we meet an inline node, let's get its parent format.
else {
for (nsINode* parentNode = content->GetParentNode(); parentNode;
parentNode = parentNode->GetParentNode()) {
// If we reach `HTMLDocument.body` or `Document.documentElement`,
// there is no format.
if (parentNode == bodyOrDocumentElement) {
break;
}
if (HTMLEditUtils::IsFormatNode(parentNode)) {
MOZ_ASSERT(parentNode->NodeInfo()->NameAtom());
paragraphStateOfNode = parentNode->NodeInfo()->NameAtom();
break;
}
}
}
// if this is the first node, we've found, remember it as the format
if (!mFirstParagraphState) {
mFirstParagraphState = paragraphStateOfNode;
continue;
}
// else make sure it matches previously found format
if (mFirstParagraphState != paragraphStateOfNode) {
mIsMixed = true;
break;
}
}
}
// static
void ParagraphStateAtSelection::AppendDescendantFormatNodesAndFirstInlineNode(
nsTArray<OwningNonNull<nsIContent>>& aArrayOfContents,
dom::Element& aNonFormatBlockElement) {
MOZ_ASSERT(HTMLEditUtils::IsBlockElement(aNonFormatBlockElement));
MOZ_ASSERT(!HTMLEditUtils::IsFormatNode(&aNonFormatBlockElement));
// We only need to place any one inline inside this node onto
// the list. They are all the same for purposes of determining
// paragraph style. We use foundInline to track this as we are
// going through the children in the loop below.
bool foundInline = false;
for (nsIContent* childContent = aNonFormatBlockElement.GetFirstChild();
childContent; childContent = childContent->GetNextSibling()) {
bool isBlock = HTMLEditUtils::IsBlockElement(*childContent);
bool isFormat = HTMLEditUtils::IsFormatNode(childContent);
// If the child is a non-format block element, let's check its children
// recursively.
if (isBlock && !isFormat) {
ParagraphStateAtSelection::AppendDescendantFormatNodesAndFirstInlineNode(
aArrayOfContents, *childContent->AsElement());
continue;
}
// If it's a format block, append it.
if (isFormat) {
aArrayOfContents.AppendElement(*childContent);
continue;
}
MOZ_ASSERT(!isBlock);
// If we haven't found inline node, append only this first inline node.
// XXX I think that this makes sense if caller of this removes
// aNonFormatBlockElement from aArrayOfContents because the last loop
// of the constructor can check parent format block with
// aNonFormatBlockElement.
if (!foundInline) {
foundInline = true;
aArrayOfContents.AppendElement(*childContent);
continue;
}
}
}
// static
nsresult ParagraphStateAtSelection::CollectEditableFormatNodesInSelection(
HTMLEditor& aHTMLEditor,
nsTArray<OwningNonNull<nsIContent>>& aArrayOfContents) {
nsresult rv = aHTMLEditor.CollectEditTargetNodesInExtendedSelectionRanges(
aArrayOfContents, EditSubAction::eCreateOrRemoveBlock,
HTMLEditor::CollectNonEditableNodes::Yes);
if (NS_FAILED(rv)) {
NS_WARNING(
"HTMLEditor::CollectEditTargetNodesInExtendedSelectionRanges("
"eCreateOrRemoveBlock, CollectNonEditableNodes::Yes) failed");
return rv;
}
// Pre-process our list of nodes
for (int32_t i = aArrayOfContents.Length() - 1; i >= 0; i--) {
OwningNonNull<nsIContent> content = aArrayOfContents[i];
// Remove all non-editable nodes. Leave them be.
if (!EditorUtils::IsEditableContent(content, EditorType::HTML)) {
aArrayOfContents.RemoveElementAt(i);
continue;
}
// Scan for table elements. If we find table elements other than table,
// replace it with a list of any editable non-table content. Ditto for
// list elements.
if (HTMLEditUtils::IsAnyTableElement(content) ||
HTMLEditUtils::IsAnyListElement(content) ||
HTMLEditUtils::IsListItem(content)) {
aArrayOfContents.RemoveElementAt(i);
aHTMLEditor.CollectChildren(content, aArrayOfContents, i,
HTMLEditor::CollectListChildren::Yes,
HTMLEditor::CollectTableChildren::Yes,
HTMLEditor::CollectNonEditableNodes::Yes);
}
}
return NS_OK;
}
} // namespace mozilla
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