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 "nsLayoutCID.h"
  24 #include "nsString.h"
  25 #include "nsGkAtoms.h"
  26
  27 using namespace mozilla;
  28
  29 //------------------------------------------------------------------------
  30
  31 const mozilla::intl::Collator* nsXULContentUtils::gCollator;
  32
  33 //------------------------------------------------------------------------
  34 // Constructors n' stuff
  35 //
  36
  37 nsresult nsXULContentUtils::Finish() {
  38   if (gCollator) {
  39     delete gCollator;
  40     gCollator = nullptr;
  41   }
  42
  43   return NS_OK;
  44 }
  45
  46 const mozilla::intl::Collator* nsXULContentUtils::GetCollator() {
  47   if (!gCollator) {
  48     // Lazily initialize the Collator.
  49     auto result = mozilla::intl::LocaleService::TryCreateComponent<
  50         mozilla::intl::Collator>();
  51     if (result.isErr()) {
  52       NS_ERROR("couldn't create a mozilla::intl::Collator");
  53       return nullptr;
  54     }
  55
  56     auto collator = result.unwrap();
  57
  58     // Sort in a case-insensitive way, where "base" letters are considered
  59     // equal, e.g: a = á, a = A, a ≠ b.
  60     mozilla::intl::Collator::Options options{};
  61     options.sensitivity = mozilla::intl::Collator::Sensitivity::Base;
  62     auto optResult = collator->SetOptions(options);
  63     if (optResult.isErr()) {
  64       NS_ERROR("couldn't set options for mozilla::intl::Collator");
  65       return nullptr;
  66     }
  67     gCollator = collator.release();
  68   }
  69
  70   return gCollator;
  71 }
  72
  73 //------------------------------------------------------------------------
  74 //
  75
  76 nsresult nsXULContentUtils::FindChildByTag(nsIContent* aElement,
  77                                            int32_t aNameSpaceID, nsAtom* aTag,
  78                                            mozilla::dom::Element** aResult) {
  79   for (nsIContent* child = aElement->GetFirstChild(); child;
  80        child = child->GetNextSibling()) {
  81     if (child->IsElement() && child->NodeInfo()->Equals(aTag, aNameSpaceID)) {
  82       NS_ADDREF(*aResult = child->AsElement());
  83       return NS_OK;
  84     }
  85   }
  86
  87   *aResult = nullptr;
  88   return NS_RDF_NO_VALUE;  // not found
  89 }