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/FetchPriority.h"
  11 #include "mozilla/dom/ReferrerInfo.h"
  12 #include "nsContentUtils.h"
  13 #include "nsNetUtil.h"
  14
  15 namespace mozilla::dom {
  16
  17 // nsISupports implementation
  18
  19 NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(
  20     XMLStylesheetProcessingInstruction, ProcessingInstruction)
  21
  22 NS_IMPL_CYCLE_COLLECTION_CLASS(XMLStylesheetProcessingInstruction)
  23
  24 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(
  25     XMLStylesheetProcessingInstruction, ProcessingInstruction)
  26   tmp->LinkStyle::Traverse(cb);
  27 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
  28
  29 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(
  30     XMLStylesheetProcessingInstruction, ProcessingInstruction)
  31   tmp->LinkStyle::Unlink();
  32 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
  33
  34 XMLStylesheetProcessingInstruction::~XMLStylesheetProcessingInstruction() =
  35     default;
  36
  37 // nsIContent
  38
  39 nsresult XMLStylesheetProcessingInstruction::BindToTree(BindContext& aContext,
  40                                                         nsINode& aParent) {
  41   nsresult rv = ProcessingInstruction::BindToTree(aContext, aParent);
  42   NS_ENSURE_SUCCESS(rv, rv);
  43
  44   void (XMLStylesheetProcessingInstruction::*update)() =
  45       &XMLStylesheetProcessingInstruction::UpdateStyleSheetInternal;
  46   nsContentUtils::AddScriptRunner(NewRunnableMethod(
  47       "dom::XMLStylesheetProcessingInstruction::BindToTree", this, update));
  48
  49   return rv;
  50 }
  51
  52 void XMLStylesheetProcessingInstruction::UnbindFromTree(
  53     UnbindContext& aContext) {
  54   nsCOMPtr<Document> oldDoc = GetUncomposedDoc();
  55
  56   ProcessingInstruction::UnbindFromTree(aContext);
  57   Unused << UpdateStyleSheetInternal(oldDoc, nullptr);
  58 }
  59
  60 // nsINode
  61
  62 void XMLStylesheetProcessingInstruction::SetNodeValueInternal(
  63     const nsAString& aNodeValue, ErrorResult& aError) {
  64   CharacterData::SetNodeValueInternal(aNodeValue, aError);
  65   if (!aError.Failed()) {
  66     Unused << UpdateStyleSheetInternal(nullptr, nullptr, ForceUpdate::Yes);
  67   }
  68 }
  69
  70 // LinkStyle
  71
  72 void XMLStylesheetProcessingInstruction::GetCharset(nsAString& aCharset) {
  73   if (!GetAttrValue(nsGkAtoms::charset, aCharset)) {
  74     aCharset.Truncate();
  75   }
  76 }
  77
  78 void XMLStylesheetProcessingInstruction::OverrideBaseURI(nsIURI* aNewBaseURI) {
  79   mOverriddenBaseURI = aNewBaseURI;
  80 }
  81
  82 Maybe<LinkStyle::SheetInfo>
  83 XMLStylesheetProcessingInstruction::GetStyleSheetInfo() {
  84   // xml-stylesheet PI is special only in prolog
  85   if (!nsContentUtils::InProlog(this)) {
  86     return Nothing();
  87   }
  88
  89   nsAutoString href;
  90   if (!GetAttrValue(nsGkAtoms::href, href)) {
  91     return Nothing();
  92   }
  93
  94   nsAutoString data;
  95   GetData(data);
  96
  97   nsAutoString title;
  98   nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::title, title);
  99
 100   nsAutoString alternateAttr;
 101   nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::alternate,
 102                                           alternateAttr);
 103
 104   bool alternate = alternateAttr.EqualsLiteral("yes");
 105   if (alternate && title.IsEmpty()) {
 106     // alternates must have title
 107     return Nothing();
 108   }
 109
 110   nsAutoString media;
 111   nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::media, media);
 112
 113   // Make sure the type handling here matches
 114   // nsXMLContentSink::HandleProcessingInstruction
 115   nsAutoString type;
 116   nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::type, type);
 117
 118   nsAutoString mimeType, notUsed;
 119   nsContentUtils::SplitMimeType(type, mimeType, notUsed);
 120   if (!mimeType.IsEmpty() && !mimeType.LowerCaseEqualsLiteral("text/css")) {
 121     return Nothing();
 122   }
 123
 124   Document* doc = OwnerDoc();
 125   nsIURI* baseURL =
 126       mOverriddenBaseURI ? mOverriddenBaseURI.get() : doc->GetDocBaseURI();
 127   auto encoding = doc->GetDocumentCharacterSet();
 128   nsCOMPtr<nsIURI> uri;
 129   NS_NewURI(getter_AddRefs(uri), href, encoding, baseURL);
 130
 131   return Some(SheetInfo{
 132       *doc,
 133       this,
 134       uri.forget(),
 135       nullptr,
 136       MakeAndAddRef<ReferrerInfo>(*doc),
 137       CORS_NONE,
 138       title,
 139       media,
 140       /* integrity = */ u""_ns,
 141       /* nonce = */ u""_ns,
 142       alternate ? HasAlternateRel::Yes : HasAlternateRel::No,
 143       IsInline::No,
 144       IsExplicitlyEnabled::No,
 145       FetchPriority::Auto,
 146   });
 147 }
 148
 149 already_AddRefed<CharacterData>
 150 XMLStylesheetProcessingInstruction::CloneDataNode(
 151     mozilla::dom::NodeInfo* aNodeInfo, bool aCloneText) const {
 152   nsAutoString data;
 153   GetData(data);
 154   RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
 155   auto* nim = ni->NodeInfoManager();
 156   return do_AddRef(new (nim)
 157                        XMLStylesheetProcessingInstruction(ni.forget(), data));
 158 }
 159
 160 }  // namespace mozilla::dom