gecko-dev/dom/base/nsTextNode.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 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/. */
/*
* Implementation of DOM Core's Text node.
*/
#include "nsTextNode.h"
#include "mozilla/dom/TextBinding.h"
#include "nsContentUtils.h"
#include "mozilla/dom/DirectionalityUtils.h"
#include "nsIDOMEventListener.h"
#include "nsIDocument.h"
#include "nsThreadUtils.h"
#include "nsStubMutationObserver.h"
#include "mozilla/IntegerPrintfMacros.h"
#ifdef DEBUG
#include "nsRange.h"
#endif
#include "nsDocument.h"
using namespace mozilla;
using namespace mozilla::dom;
/**
* class used to implement attr() generated content
*/
class nsAttributeTextNode final : public nsTextNode,
public nsStubMutationObserver
{
public:
NS_DECL_ISUPPORTS_INHERITED
nsAttributeTextNode(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
int32_t aNameSpaceID,
nsAtom* aAttrName) :
nsTextNode(std::move(aNodeInfo)),
mGrandparent(nullptr),
mNameSpaceID(aNameSpaceID),
mAttrName(aAttrName)
{
NS_ASSERTION(mNameSpaceID != kNameSpaceID_Unknown, "Must know namespace");
NS_ASSERTION(mAttrName, "Must have attr name");
}
virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent) override;
virtual void UnbindFromTree(bool aDeep = true,
bool aNullParent = true) override;
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
virtual already_AddRefed<CharacterData>
CloneDataNode(mozilla::dom::NodeInfo *aNodeInfo,
bool aCloneText) const override
{
RefPtr<nsAttributeTextNode> it =
new nsAttributeTextNode(do_AddRef(aNodeInfo), mNameSpaceID, mAttrName);
if (aCloneText) {
it->mText = mText;
}
return it.forget();
}
// Public method for the event to run
void UpdateText() {
UpdateText(true);
}
private:
virtual ~nsAttributeTextNode() {
NS_ASSERTION(!mGrandparent, "We were not unbound!");
}
// Update our text to our parent's current attr value
void UpdateText(bool aNotify);
// This doesn't need to be a strong pointer because it's only non-null
// while we're bound to the document tree, and it points to an ancestor
// so the ancestor must be bound to the document tree the whole time
// and can't be deleted.
Element* mGrandparent;
// What attribute we're showing
int32_t mNameSpaceID;
RefPtr<nsAtom> mAttrName;
};
nsTextNode::~nsTextNode()
{
}
// Use the CC variant of this, even though this class does not define
// a new CC participant, to make QIing to the CC interfaces faster.
NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(nsTextNode, CharacterData)
JSObject*
nsTextNode::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
{
return Text_Binding::Wrap(aCx, this, aGivenProto);
}
bool
nsTextNode::IsNodeOfType(uint32_t aFlags) const
{
return false;
}
already_AddRefed<CharacterData>
nsTextNode::CloneDataNode(mozilla::dom::NodeInfo *aNodeInfo, bool aCloneText) const
{
RefPtr<nsTextNode> it = new nsTextNode(do_AddRef(aNodeInfo));
if (aCloneText) {
it->mText = mText;
}
return it.forget();
}
nsresult
nsTextNode::AppendTextForNormalize(const char16_t* aBuffer, uint32_t aLength,
bool aNotify, nsIContent* aNextSibling)
{
CharacterDataChangeInfo::Details details = {
CharacterDataChangeInfo::Details::eMerge, aNextSibling
};
return SetTextInternal(mText.GetLength(), 0, aBuffer, aLength, aNotify, &details);
}
nsresult
nsTextNode::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent)
{
nsresult rv = CharacterData::BindToTree(aDocument, aParent,
aBindingParent);
NS_ENSURE_SUCCESS(rv, rv);
SetDirectionFromNewTextNode(this);
return NS_OK;
}
void nsTextNode::UnbindFromTree(bool aDeep, bool aNullParent)
{
ResetDirectionSetByTextNode(this);
CharacterData::UnbindFromTree(aDeep, aNullParent);
}
bool
nsTextNode::IsShadowDOMEnabled(JSContext* aCx, JSObject* aObject)
{
return nsDocument::IsShadowDOMEnabled(aCx, aObject);
}
#ifdef DEBUG
void
nsTextNode::List(FILE* out, int32_t aIndent) const
{
int32_t index;
for (index = aIndent; --index >= 0; ) fputs(" ", out);
fprintf(out, "Text@%p", static_cast<const void*>(this));
fprintf(out, " flags=[%08x]", static_cast<unsigned int>(GetFlags()));
if (IsCommonAncestorForRangeInSelection()) {
const LinkedList<nsRange>* ranges = GetExistingCommonAncestorRanges();
int32_t count = 0;
if (ranges) {
// Can't use range-based iteration on a const LinkedList, unfortunately.
for (const nsRange* r = ranges->getFirst(); r; r = r->getNext()) {
++count;
}
}
fprintf(out, " ranges:%d", count);
}
fprintf(out, " primaryframe=%p", static_cast<void*>(GetPrimaryFrame()));
fprintf(out, " refcount=%" PRIuPTR "<", mRefCnt.get());
nsAutoString tmp;
ToCString(tmp, 0, mText.GetLength());
fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
fputs(">\n", out);
}
void
nsTextNode::DumpContent(FILE* out, int32_t aIndent, bool aDumpAll) const
{
if(aDumpAll) {
int32_t index;
for (index = aIndent; --index >= 0; ) fputs(" ", out);
nsAutoString tmp;
ToCString(tmp, 0, mText.GetLength());
if(!tmp.EqualsLiteral("\\n")) {
fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
if(aIndent) fputs("\n", out);
}
}
}
#endif
nsresult
NS_NewAttributeContent(nsNodeInfoManager *aNodeInfoManager,
int32_t aNameSpaceID, nsAtom* aAttrName,
nsIContent** aResult)
{
MOZ_ASSERT(aNodeInfoManager, "Missing nodeInfoManager");
MOZ_ASSERT(aAttrName, "Must have an attr name");
MOZ_ASSERT(aNameSpaceID != kNameSpaceID_Unknown, "Must know namespace");
*aResult = nullptr;
RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfoManager->GetTextNodeInfo();
RefPtr<nsAttributeTextNode> textNode = new nsAttributeTextNode(ni.forget(),
aNameSpaceID,
aAttrName);
textNode.forget(aResult);
return NS_OK;
}
NS_IMPL_ISUPPORTS_INHERITED(nsAttributeTextNode, nsTextNode,
nsIMutationObserver)
nsresult
nsAttributeTextNode::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent)
{
MOZ_ASSERT(aParent && aParent->GetParent(),
"This node can't be a child of the document or of the document root");
nsresult rv = nsTextNode::BindToTree(aDocument, aParent,
aBindingParent);
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(!mGrandparent, "We were already bound!");
mGrandparent = aParent->GetParent()->AsElement();
mGrandparent->AddMutationObserver(this);
// Note that there is no need to notify here, since we have no
// frame yet at this point.
UpdateText(false);
return NS_OK;
}
void
nsAttributeTextNode::UnbindFromTree(bool aDeep, bool aNullParent)
{
// UnbindFromTree can be called anytime so we have to be safe.
if (mGrandparent) {
// aNullParent might not be true here, but we want to remove the
// mutation observer anyway since we only need it while we're
// in the document.
mGrandparent->RemoveMutationObserver(this);
mGrandparent = nullptr;
}
nsTextNode::UnbindFromTree(aDeep, aNullParent);
}
void
nsAttributeTextNode::AttributeChanged(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
if (aNameSpaceID == mNameSpaceID && aAttribute == mAttrName &&
aElement == mGrandparent) {
// Since UpdateText notifies, do it when it's safe to run script. Note
// that if we get unbound while the event is up that's ok -- we'll just
// have no grandparent when it fires, and will do nothing.
void (nsAttributeTextNode::*update)() = &nsAttributeTextNode::UpdateText;
nsContentUtils::AddScriptRunner(
NewRunnableMethod("nsAttributeTextNode::AttributeChanged", this, update));
}
}
void
nsAttributeTextNode::NodeWillBeDestroyed(const nsINode* aNode)
{
NS_ASSERTION(aNode == static_cast<nsINode*>(mGrandparent), "Wrong node!");
mGrandparent = nullptr;
}
void
nsAttributeTextNode::UpdateText(bool aNotify)
{
if (mGrandparent) {
nsAutoString attrValue;
mGrandparent->GetAttr(mNameSpaceID, mAttrName, attrValue);
SetText(attrValue, aNotify);
}
}