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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/. */
#include "mozilla/dom/SVGTests.h"
#include "DOMSVGStringList.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "mozilla/dom/SVGSwitchElement.h"
#include "mozilla/intl/oxilangtag_ffi_generated.h"
#include "mozilla/Preferences.h"
namespace mozilla::dom {
nsStaticAtom* const SVGTests::sStringListNames[2] = {
nsGkAtoms::requiredExtensions,
nsGkAtoms::systemLanguage,
};
SVGTests::SVGTests() {
mStringListAttributes[LANGUAGE].SetIsCommaSeparated(true);
}
already_AddRefed<DOMSVGStringList> SVGTests::RequiredExtensions() {
return DOMSVGStringList::GetDOMWrapper(&mStringListAttributes[EXTENSIONS],
AsSVGElement(), true, EXTENSIONS);
}
already_AddRefed<DOMSVGStringList> SVGTests::SystemLanguage() {
return DOMSVGStringList::GetDOMWrapper(&mStringListAttributes[LANGUAGE],
AsSVGElement(), true, LANGUAGE);
}
bool SVGTests::HasExtension(const nsAString& aExtension) const {
#define SVG_SUPPORTED_EXTENSION(str) \
if (aExtension.EqualsLiteral(str)) return true;
SVG_SUPPORTED_EXTENSION("http://www.w3.org/1999/xhtml")
nsNameSpaceManager* nameSpaceManager = nsNameSpaceManager::GetInstance();
if (AsSVGElement()->IsInChromeDocument() ||
!nameSpaceManager->mMathMLDisabled) {
SVG_SUPPORTED_EXTENSION("http://www.w3.org/1998/Math/MathML")
}
#undef SVG_SUPPORTED_EXTENSION
return false;
}
bool SVGTests::IsConditionalProcessingAttribute(
const nsAtom* aAttribute) const {
for (uint32_t i = 0; i < ArrayLength(sStringListNames); i++) {
if (aAttribute == sStringListNames[i]) {
return true;
}
}
return false;
}
// Find the best match from aAvailLangs for the users accept-languages,
// returning the index in the aAvailLangs list, or -1 if no match.
int32_t FindBestLanguage(const nsTArray<nsCString>& aAvailLangs) {
AutoTArray<nsCString, 16> reqLangs;
nsCString acceptLangs;
Preferences::GetLocalizedCString("intl.accept_languages", acceptLangs);
nsCCharSeparatedTokenizer languageTokenizer(acceptLangs, ',');
while (languageTokenizer.hasMoreTokens()) {
reqLangs.AppendElement(languageTokenizer.nextToken());
}
for (const auto& req : reqLangs) {
for (const auto& avail : aAvailLangs) {
if (avail.Length() > req.Length()) {
// Ensure that en does not match en-us, i.e. you need to have en in
// intl.accept_languages to match en in markup.
continue;
}
using namespace intl::ffi;
struct LangTagDelete {
void operator()(LangTag* aLangTag) const { lang_tag_destroy(aLangTag); }
};
UniquePtr<LangTag, LangTagDelete> langTag(lang_tag_new(&avail));
if (langTag && lang_tag_matches(langTag.get(), &req)) {
return &avail - &aAvailLangs[0];
}
}
}
return -1;
}
nsIContent* SVGTests::FindActiveSwitchChild(
const dom::SVGSwitchElement* aSwitch) {
AutoTArray<nsCString, 16> availLocales;
AutoTArray<nsIContent*, 16> children;
nsIContent* defaultChild = nullptr;
for (auto* child = aSwitch->GetFirstChild(); child;
child = child->GetNextSibling()) {
if (!child->IsElement()) {
continue;
}
nsCOMPtr<SVGTests> tests(do_QueryInterface(child));
if (tests) {
if (!tests->mPassesConditionalProcessingTests.valueOr(true) ||
!tests->PassesRequiredExtensionsTests()) {
continue;
}
const auto& languages = tests->mStringListAttributes[LANGUAGE];
if (!languages.IsExplicitlySet()) {
if (!defaultChild) {
defaultChild = child;
}
continue;
}
for (uint32_t i = 0; i < languages.Length(); i++) {
children.AppendElement(child);
availLocales.AppendElement(NS_ConvertUTF16toUTF8(languages[i]));
}
}
}
// For each entry in availLocales, we expect to have a corresponding entry
// in children that provides the child node associated with that locale.
MOZ_ASSERT(children.Length() == availLocales.Length());
if (availLocales.IsEmpty()) {
return defaultChild;
}
int32_t index = FindBestLanguage(availLocales);
if (index >= 0) {
return children[index];
}
return defaultChild;
}
bool SVGTests::PassesRequiredExtensionsTests() const {
// Required Extensions
//
// The requiredExtensions attribute defines a list of required language
// extensions. Language extensions are capabilities within a user agent that
// go beyond the feature set defined in the SVG specification.
// Each extension is identified by a URI reference.
// For now, claim that mozilla's SVG implementation supports XHTML and MathML.
const auto& extensions = mStringListAttributes[EXTENSIONS];
if (extensions.IsExplicitlySet()) {
if (extensions.IsEmpty()) {
mPassesConditionalProcessingTests = Some(false);
return false;
}
for (uint32_t i = 0; i < extensions.Length(); i++) {
if (!HasExtension(extensions[i])) {
mPassesConditionalProcessingTests = Some(false);
return false;
}
}
}
return true;
}
bool SVGTests::PassesConditionalProcessingTests() const {
if (mPassesConditionalProcessingTests) {
return mPassesConditionalProcessingTests.value();
}
if (!PassesRequiredExtensionsTests()) {
return false;
}
// systemLanguage
//
// Evaluates to true if there's a BCP 47 match for the one of the user
// preference languages with one of the languages given in the value of
// this parameter.
const auto& languages = mStringListAttributes[LANGUAGE];
if (languages.IsExplicitlySet()) {
if (languages.IsEmpty()) {
mPassesConditionalProcessingTests = Some(false);
return false;
}
AutoTArray<nsCString, 4> availLocales;
for (uint32_t i = 0; i < languages.Length(); i++) {
availLocales.AppendElement(NS_ConvertUTF16toUTF8(languages[i]));
}
mPassesConditionalProcessingTests =
Some(FindBestLanguage(availLocales) >= 0);
return mPassesConditionalProcessingTests.value();
}
mPassesConditionalProcessingTests = Some(true);
return true;
}
bool SVGTests::ParseConditionalProcessingAttribute(nsAtom* aAttribute,
const nsAString& aValue,
nsAttrValue& aResult) {
for (uint32_t i = 0; i < ArrayLength(sStringListNames); i++) {
if (aAttribute == sStringListNames[i]) {
nsresult rv = mStringListAttributes[i].SetValue(aValue);
if (NS_FAILED(rv)) {
mStringListAttributes[i].Clear();
}
mPassesConditionalProcessingTests = Nothing();
MaybeInvalidate();
return true;
}
}
return false;
}
void SVGTests::UnsetAttr(const nsAtom* aAttribute) {
for (uint32_t i = 0; i < ArrayLength(sStringListNames); i++) {
if (aAttribute == sStringListNames[i]) {
mStringListAttributes[i].Clear();
mPassesConditionalProcessingTests = Nothing();
MaybeInvalidate();
return;
}
}
}
nsStaticAtom* SVGTests::GetAttrName(uint8_t aAttrEnum) const {
return sStringListNames[aAttrEnum];
}
void SVGTests::GetAttrValue(uint8_t aAttrEnum, nsAttrValue& aValue) const {
MOZ_ASSERT(aAttrEnum < ArrayLength(sStringListNames),
"aAttrEnum out of range");
aValue.SetTo(mStringListAttributes[aAttrEnum], nullptr);
}
void SVGTests::MaybeInvalidate() {
nsIContent* parent = AsSVGElement()->GetFlattenedTreeParent();
if (auto* svgSwitch = SVGSwitchElement::FromNodeOrNull(parent)) {
svgSwitch->MaybeInvalidate();
}
}
} // namespace mozilla::dom
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