dom/svg/SVGTests.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/SVGTests.h"
   8 #include "DOMSVGStringList.h"
   9 #include "nsIContent.h"
  10 #include "nsIContentInlines.h"
  11 #include "mozilla/dom/SVGSwitchElement.h"
  12 #include "nsCharSeparatedTokenizer.h"
  13 #include "nsStyleUtil.h"
  14 #include "mozilla/Preferences.h"
  15
  16 namespace mozilla::dom {
  17
  18 nsStaticAtom* const SVGTests::sStringListNames[2] = {
  19     nsGkAtoms::requiredExtensions,
  20     nsGkAtoms::systemLanguage,
  21 };
  22
  23 SVGTests::SVGTests() {
  24   mStringListAttributes[LANGUAGE].SetIsCommaSeparated(true);
  25 }
  26
  27 already_AddRefed<DOMSVGStringList> SVGTests::RequiredExtensions() {
  28   return DOMSVGStringList::GetDOMWrapper(&mStringListAttributes[EXTENSIONS],
  29                                          AsSVGElement(), true, EXTENSIONS);
  30 }
  31
  32 already_AddRefed<DOMSVGStringList> SVGTests::SystemLanguage() {
  33   return DOMSVGStringList::GetDOMWrapper(&mStringListAttributes[LANGUAGE],
  34                                          AsSVGElement(), true, LANGUAGE);
  35 }
  36
  37 bool SVGTests::HasExtension(const nsAString& aExtension) const {
  38 #define SVG_SUPPORTED_EXTENSION(str) \
  39   if (aExtension.EqualsLiteral(str)) return true;
  40   SVG_SUPPORTED_EXTENSION("http://www.w3.org/1999/xhtml")
  41   nsNameSpaceManager* nameSpaceManager = nsNameSpaceManager::GetInstance();
  42   if (AsSVGElement()->IsInChromeDocument() ||
  43       !nameSpaceManager->mMathMLDisabled) {
  44     SVG_SUPPORTED_EXTENSION("http://www.w3.org/1998/Math/MathML")
  45   }
  46 #undef SVG_SUPPORTED_EXTENSION
  47
  48   return false;
  49 }
  50
  51 bool SVGTests::IsConditionalProcessingAttribute(
  52     const nsAtom* aAttribute) const {
  53   for (uint32_t i = 0; i < ArrayLength(sStringListNames); i++) {
  54     if (aAttribute == sStringListNames[i]) {
  55       return true;
  56     }
  57   }
  58   return false;
  59 }
  60
  61 int32_t SVGTests::GetBestLanguagePreferenceRank(
  62     const nsAString& aAcceptLangs) const {
  63   if (!mStringListAttributes[LANGUAGE].IsExplicitlySet()) {
  64     return -2;
  65   }
  66
  67   int32_t lowestRank = -1;
  68
  69   for (uint32_t i = 0; i < mStringListAttributes[LANGUAGE].Length(); i++) {
  70     int32_t index = 0;
  71     for (const nsAString& languageToken :
  72          nsCharSeparatedTokenizer(aAcceptLangs, ',').ToRange()) {
  73       bool exactMatch = languageToken.Equals(mStringListAttributes[LANGUAGE][i],
  74                                              nsCaseInsensitiveStringComparator);
  75       bool prefixOnlyMatch =
  76           !exactMatch && nsStyleUtil::DashMatchCompare(
  77                              mStringListAttributes[LANGUAGE][i], languageToken,
  78                              nsCaseInsensitiveStringComparator);
  79       if (index == 0 && exactMatch) {
  80         // best possible match
  81         return 0;
  82       }
  83       if ((exactMatch || prefixOnlyMatch) &&
  84           (lowestRank == -1 || 2 * index + prefixOnlyMatch < lowestRank)) {
  85         lowestRank = 2 * index + prefixOnlyMatch;
  86       }
  87       ++index;
  88     }
  89   }
  90   return lowestRank;
  91 }
  92
  93 bool SVGTests::PassesConditionalProcessingTestsIgnoringSystemLanguage() const {
  94   // Required Extensions
  95   //
  96   // The requiredExtensions  attribute defines a list of required language
  97   // extensions. Language extensions are capabilities within a user agent that
  98   // go beyond the feature set defined in the SVG specification.
  99   // Each extension is identified by a URI reference.
 100   // For now, claim that mozilla's SVG implementation supports XHTML and MathML.
 101   if (mStringListAttributes[EXTENSIONS].IsExplicitlySet()) {
 102     if (mStringListAttributes[EXTENSIONS].IsEmpty()) {
 103       return false;
 104     }
 105     for (uint32_t i = 0; i < mStringListAttributes[EXTENSIONS].Length(); i++) {
 106       if (!HasExtension(mStringListAttributes[EXTENSIONS][i])) {
 107         return false;
 108       }
 109     }
 110   }
 111   return true;
 112 }
 113
 114 bool SVGTests::PassesConditionalProcessingTests() const {
 115   if (!PassesConditionalProcessingTestsIgnoringSystemLanguage()) {
 116     return false;
 117   }
 118
 119   // systemLanguage
 120   //
 121   // Evaluates to "true" if one of the languages indicated by user preferences
 122   // exactly equals one of the languages given in the value of this parameter,
 123   // or if one of the languages indicated by user preferences exactly equals a
 124   // prefix of one of the languages given in the value of this parameter such
 125   // that the first tag character following the prefix is "-".
 126   if (mStringListAttributes[LANGUAGE].IsExplicitlySet()) {
 127     if (mStringListAttributes[LANGUAGE].IsEmpty()) {
 128       return false;
 129     }
 130
 131     // Get our language preferences
 132     nsAutoString acceptLangs;
 133     Preferences::GetLocalizedString("intl.accept_languages", acceptLangs);
 134
 135     if (acceptLangs.IsEmpty()) {
 136       NS_WARNING(
 137           "no default language specified for systemLanguage conditional test");
 138       return false;
 139     }
 140
 141     for (uint32_t i = 0; i < mStringListAttributes[LANGUAGE].Length(); i++) {
 142       nsCharSeparatedTokenizer languageTokenizer(acceptLangs, ',');
 143       while (languageTokenizer.hasMoreTokens()) {
 144         if (nsStyleUtil::DashMatchCompare(mStringListAttributes[LANGUAGE][i],
 145                                           languageTokenizer.nextToken(),
 146                                           nsCaseInsensitiveStringComparator)) {
 147           return true;
 148         }
 149       }
 150     }
 151     return false;
 152   }
 153
 154   return true;
 155 }
 156
 157 bool SVGTests::ParseConditionalProcessingAttribute(nsAtom* aAttribute,
 158                                                    const nsAString& aValue,
 159                                                    nsAttrValue& aResult) {
 160   for (uint32_t i = 0; i < ArrayLength(sStringListNames); i++) {
 161     if (aAttribute == sStringListNames[i]) {
 162       nsresult rv = mStringListAttributes[i].SetValue(aValue);
 163       if (NS_FAILED(rv)) {
 164         mStringListAttributes[i].Clear();
 165       }
 166       MaybeInvalidate();
 167       return true;
 168     }
 169   }
 170   return false;
 171 }
 172
 173 void SVGTests::UnsetAttr(const nsAtom* aAttribute) {
 174   for (uint32_t i = 0; i < ArrayLength(sStringListNames); i++) {
 175     if (aAttribute == sStringListNames[i]) {
 176       mStringListAttributes[i].Clear();
 177       MaybeInvalidate();
 178       return;
 179     }
 180   }
 181 }
 182
 183 nsStaticAtom* SVGTests::GetAttrName(uint8_t aAttrEnum) const {
 184   return sStringListNames[aAttrEnum];
 185 }
 186
 187 void SVGTests::GetAttrValue(uint8_t aAttrEnum, nsAttrValue& aValue) const {
 188   MOZ_ASSERT(aAttrEnum < ArrayLength(sStringListNames),
 189              "aAttrEnum out of range");
 190   aValue.SetTo(mStringListAttributes[aAttrEnum], nullptr);
 191 }
 192
 193 void SVGTests::MaybeInvalidate() {
 194   nsIContent* parent = AsSVGElement()->GetFlattenedTreeParent();
 195
 196   if (auto* svgSwitch = SVGSwitchElement::FromNodeOrNull(parent)) {
 197     svgSwitch->MaybeInvalidate();
 198   }
 199 }
 200
 201 }  // namespace mozilla::dom