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Diffstat (limited to '')
-rw-r--r-- | intl/unicharutil/util/ICUUtils.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/intl/unicharutil/util/ICUUtils.h b/intl/unicharutil/util/ICUUtils.h new file mode 100644 index 0000000000..c5d95d773f --- /dev/null +++ b/intl/unicharutil/util/ICUUtils.h @@ -0,0 +1,95 @@ +/* -*- 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__ + +// 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 "nsStringFwd.h" +# include "unicode/unum.h" // for UNumberFormat +# include "mozilla/intl/ICUError.h" +# include "mozilla/AlreadyAddRefed.h" + +class nsIContent; +class nsAtom; + +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. + */ + already_AddRefed<nsAtom> GetNext(); + + 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(const nsAString& aValue, + LanguageTagIterForContent& aLangTags); + + static void AssignUCharArrayToString(UChar* aICUString, int32_t aLength, + nsAString& aMozString); + + /** + * Map ICUError to nsresult + */ + static nsresult ICUErrorToNsResult(const mozilla::intl::ICUError aError); + +# 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 /* MOZILLA_INTERNAL_API */ + +#endif /* mozilla_ICUUtils_h__ */ |