dom/xml/XMLStylesheetProcessingInstruction.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 "XMLStylesheetProcessingInstruction.h"
   8
   9 #include "mozilla/dom/Document.h"
  10 #include "mozilla/dom/ReferrerInfo.h"
  11 #include "nsContentUtils.h"
  12 #include "nsNetUtil.h"
  13
  14 namespace mozilla::dom {
  15
  16 // nsISupports implementation
  17
  18 NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(
  19     XMLStylesheetProcessingInstruction, ProcessingInstruction)
  20
  21 NS_IMPL_CYCLE_COLLECTION_CLASS(XMLStylesheetProcessingInstruction)
  22
  23 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(
  24     XMLStylesheetProcessingInstruction, ProcessingInstruction)
  25   tmp->LinkStyle::Traverse(cb);
  26 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
  27
  28 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(
  29     XMLStylesheetProcessingInstruction, ProcessingInstruction)
  30   tmp->LinkStyle::Unlink();
  31 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
  32
  33 XMLStylesheetProcessingInstruction::~XMLStylesheetProcessingInstruction() =
  34     default;
  35
  36 // nsIContent
  37
  38 nsresult XMLStylesheetProcessingInstruction::BindToTree(BindContext& aContext,
  39                                                         nsINode& aParent) {
  40   nsresult rv = ProcessingInstruction::BindToTree(aContext, aParent);
  41   NS_ENSURE_SUCCESS(rv, rv);
  42
  43   void (XMLStylesheetProcessingInstruction::*update)() =
  44       &XMLStylesheetProcessingInstruction::UpdateStyleSheetInternal;
  45   nsContentUtils::AddScriptRunner(NewRunnableMethod(
  46       "dom::XMLStylesheetProcessingInstruction::BindToTree", this, update));
  47
  48   return rv;
  49 }
  50
  51 void XMLStylesheetProcessingInstruction::UnbindFromTree(bool aNullParent) {
  52   nsCOMPtr<Document> oldDoc = GetUncomposedDoc();
  53
  54   ProcessingInstruction::UnbindFromTree(aNullParent);
  55   Unused << UpdateStyleSheetInternal(oldDoc, nullptr);
  56 }
  57
  58 // nsINode
  59
  60 void XMLStylesheetProcessingInstruction::SetNodeValueInternal(
  61     const nsAString& aNodeValue, ErrorResult& aError) {
  62   CharacterData::SetNodeValueInternal(aNodeValue, aError);
  63   if (!aError.Failed()) {
  64     Unused << UpdateStyleSheetInternal(nullptr, nullptr, ForceUpdate::Yes);
  65   }
  66 }
  67
  68 // LinkStyle
  69
  70 void XMLStylesheetProcessingInstruction::GetCharset(nsAString& aCharset) {
  71   if (!GetAttrValue(nsGkAtoms::charset, aCharset)) {
  72     aCharset.Truncate();
  73   }
  74 }
  75
  76 void XMLStylesheetProcessingInstruction::OverrideBaseURI(nsIURI* aNewBaseURI) {
  77   mOverriddenBaseURI = aNewBaseURI;
  78 }
  79
  80 Maybe<LinkStyle::SheetInfo>
  81 XMLStylesheetProcessingInstruction::GetStyleSheetInfo() {
  82   // xml-stylesheet PI is special only in prolog
  83   if (!nsContentUtils::InProlog(this)) {
  84     return Nothing();
  85   }
  86
  87   nsAutoString href;
  88   if (!GetAttrValue(nsGkAtoms::href, href)) {
  89     return Nothing();
  90   }
  91
  92   nsAutoString data;
  93   GetData(data);
  94
  95   nsAutoString title;
  96   nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::title, title);
  97
  98   nsAutoString alternateAttr;
  99   nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::alternate,
 100                                           alternateAttr);
 101
 102   bool alternate = alternateAttr.EqualsLiteral("yes");
 103   if (alternate && title.IsEmpty()) {
 104     // alternates must have title
 105     return Nothing();
 106   }
 107
 108   nsAutoString media;
 109   nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::media, media);
 110
 111   // Make sure the type handling here matches
 112   // nsXMLContentSink::HandleProcessingInstruction
 113   nsAutoString type;
 114   nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::type, type);
 115
 116   nsAutoString mimeType, notUsed;
 117   nsContentUtils::SplitMimeType(type, mimeType, notUsed);
 118   if (!mimeType.IsEmpty() && !mimeType.LowerCaseEqualsLiteral("text/css")) {
 119     return Nothing();
 120   }
 121
 122   Document* doc = OwnerDoc();
 123   nsIURI* baseURL =
 124       mOverriddenBaseURI ? mOverriddenBaseURI.get() : doc->GetDocBaseURI();
 125   auto encoding = doc->GetDocumentCharacterSet();
 126   nsCOMPtr<nsIURI> uri;
 127   NS_NewURI(getter_AddRefs(uri), href, encoding, baseURL);
 128
 129   return Some(SheetInfo{
 130       *doc,
 131       this,
 132       uri.forget(),
 133       nullptr,
 134       MakeAndAddRef<ReferrerInfo>(*doc),
 135       CORS_NONE,
 136       title,
 137       media,
 138       /* integrity = */ u""_ns,
 139       /* nonce = */ u""_ns,
 140       alternate ? HasAlternateRel::Yes : HasAlternateRel::No,
 141       IsInline::No,
 142       IsExplicitlyEnabled::No,
 143   });
 144 }
 145
 146 already_AddRefed<CharacterData>
 147 XMLStylesheetProcessingInstruction::CloneDataNode(
 148     mozilla::dom::NodeInfo* aNodeInfo, bool aCloneText) const {
 149   nsAutoString data;
 150   GetData(data);
 151   RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
 152   auto* nim = ni->NodeInfoManager();
 153   return do_AddRef(new (nim)
 154                        XMLStylesheetProcessingInstruction(ni.forget(), data));
 155 }
 156
 157 }  // namespace mozilla::dom