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115 lines
3.6 KiB
C++
115 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ICUUtils_h__
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#define mozilla_ICUUtils_h__
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// We only build the ICU utils if we're building ICU:
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#ifdef ENABLE_INTL_API
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// The ICU utils implementation needs internal things like XPCOM strings and
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// nsGkAtom, so we only build when included into internal libs:
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#ifdef MOZILLA_INTERNAL_API
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#include "mozilla/Scoped.h"
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#include "nsStringGlue.h"
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#include "unicode/unum.h" // for UNumberFormat
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class nsIContent;
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namespace {
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struct ScopedUNumberFormatTraits {
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typedef UNumberFormat* type;
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static type empty() { return nullptr; }
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static void release(type handle) { if (handle) unum_close(handle); }
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};
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};
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typedef mozilla::Scoped<ScopedUNumberFormatTraits> AutoCloseUNumberFormat;
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class ICUUtils
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{
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public:
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/**
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* This class is used to encapsulate an nsIContent object to allow lazy
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* iteration over its primary and fallback BCP 47 language tags.
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*/
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class LanguageTagIterForContent {
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public:
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explicit LanguageTagIterForContent(nsIContent* aContent)
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: mContent(aContent)
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, mCurrentFallbackIndex(-1)
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{}
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/**
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* Used to iterate over the nsIContent object's primary language tag and
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* its fallbacks tags. The following sources of language tag information
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* are tried in turn:
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*
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* 1) the "lang" of the nsIContent object (which is based on the 'lang'/
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* 'xml:lang' attribute on itself or the nearest ancestor to have such
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* an attribute, if any);
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* 2) the Content-Language HTTP pragma directive or HTTP header;
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* 3) the configured language tag of the user-agent.
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*
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* Once all fallbacks have been exhausted then this function will set
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* aBCP47LangTag to the empty string.
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*/
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void GetNext(nsACString& aBCP47LangTag);
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bool IsAtStart() const {
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return mCurrentFallbackIndex < 0;
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}
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private:
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nsIContent* mContent;
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int8_t mCurrentFallbackIndex;
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};
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/**
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* Attempts to localize aValue and return the result via the aLocalizedValue
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* outparam. Returns true on success. Returns false on failure, in which
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* case aLocalizedValue will be untouched.
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*/
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static bool LocalizeNumber(double aValue,
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LanguageTagIterForContent& aLangTags,
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nsAString& aLocalizedValue);
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/**
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* Parses the localized number that is serialized in aValue using aLangTags
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* and returns the result as a double. Returns NaN on failure.
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*/
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static double ParseNumber(nsAString& aValue,
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LanguageTagIterForContent& aLangTags);
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static void AssignUCharArrayToString(UChar* aICUString,
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int32_t aLength,
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nsAString& aMozString);
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/**
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* Map ICU UErrorCode to nsresult
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*/
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static nsresult UErrorToNsResult(const UErrorCode aErrorCode);
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#if 0
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// Currently disabled because using C++ API doesn't play nicely with enabling
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// system ICU.
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/**
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* Converts an IETF BCP 47 language code to an ICU Locale.
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*/
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static Locale BCP47CodeToLocale(const nsAString& aBCP47Code);
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static void ToMozString(UnicodeString& aICUString, nsAString& aMozString);
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static void ToICUString(nsAString& aMozString, UnicodeString& aICUString);
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#endif
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};
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#endif /* ENABLE_INTL_API */
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#endif /* MOZILLA_INTERNAL_API */
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#endif /* mozilla_ICUUtils_h__ */
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