dom/xul/nsXULContentUtils.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   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 /*
   8
   9   A package of routines shared by the XUL content code.
  10
  11  */
  12
  13 #include "mozilla/ArrayUtils.h"
  14 #include "mozilla/intl/LocaleService.h"
  15 #include "mozilla/intl/Collator.h"
  16
  17 #include "nsCOMPtr.h"
  18 #include "nsComponentManagerUtils.h"
  19 #include "nsIContent.h"
  20 #include "mozilla/dom/Document.h"
  21 #include "mozilla/dom/Element.h"
  22 #include "nsXULContentUtils.h"
  23 #include "nsString.h"
  24 #include "nsGkAtoms.h"
  25
  26 using namespace mozilla;
  27
  28 //------------------------------------------------------------------------
  29
  30 const mozilla::intl::Collator* nsXULContentUtils::gCollator;
  31
  32 //------------------------------------------------------------------------
  33 // Constructors n' stuff
  34 //
  35
  36 nsresult nsXULContentUtils::Finish() {
  37   if (gCollator) {
  38     delete gCollator;
  39     gCollator = nullptr;
  40   }
  41
  42   return NS_OK;
  43 }
  44
  45 const mozilla::intl::Collator* nsXULContentUtils::GetCollator() {
  46   if (!gCollator) {
  47     // Lazily initialize the Collator.
  48     auto result = mozilla::intl::LocaleService::TryCreateComponent<
  49         mozilla::intl::Collator>();
  50     if (result.isErr()) {
  51       NS_ERROR("couldn't create a mozilla::intl::Collator");
  52       return nullptr;
  53     }
  54
  55     auto collator = result.unwrap();
  56
  57     // Sort in a case-insensitive way, where "base" letters are considered
  58     // equal, e.g: a = á, a = A, a ≠ b.
  59     mozilla::intl::Collator::Options options{};
  60     options.sensitivity = mozilla::intl::Collator::Sensitivity::Base;
  61     auto optResult = collator->SetOptions(options);
  62     if (optResult.isErr()) {
  63       NS_ERROR("couldn't set options for mozilla::intl::Collator");
  64       return nullptr;
  65     }
  66     gCollator = collator.release();
  67   }
  68
  69   return gCollator;
  70 }
  71
  72 //------------------------------------------------------------------------
  73 //
  74
  75 nsresult nsXULContentUtils::FindChildByTag(nsIContent* aElement,
  76                                            int32_t aNameSpaceID, nsAtom* aTag,
  77                                            mozilla::dom::Element** aResult) {
  78   for (nsIContent* child = aElement->GetFirstChild(); child;
  79        child = child->GetNextSibling()) {
  80     if (child->IsElement() && child->NodeInfo()->Equals(aTag, aNameSpaceID)) {
  81       NS_ADDREF(*aResult = child->AsElement());
  82       return NS_OK;
  83     }
  84   }
  85
  86   *aResult = nullptr;
  87   return NS_RDF_NO_VALUE;  // not found
  88 }