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