1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/intl/unicharutil/util/ICUUtils.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,109 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef mozilla_ICUUtils_h__
1.10 +#define mozilla_ICUUtils_h__
1.11 +
1.12 +// We only build the ICU utils if we're building ICU:
1.13 +#ifdef ENABLE_INTL_API
1.14 +
1.15 +// The ICU utils implementation needs internal things like XPCOM strings and
1.16 +// nsGkAtom, so we only build when included into internal libs:
1.17 +#ifdef MOZILLA_INTERNAL_API
1.18 +
1.19 +#include "mozilla/Scoped.h"
1.20 +#include "nsStringGlue.h"
1.21 +#include "unicode/unum.h" // for UNumberFormat
1.22 +
1.23 +class nsIContent;
1.24 +
1.25 +namespace {
1.26 + struct ScopedUNumberFormatTraits {
1.27 + typedef UNumberFormat* type;
1.28 + static type empty() { return nullptr; }
1.29 + static void release(type handle) { if (handle) unum_close(handle); }
1.30 + };
1.31 +};
1.32 +typedef mozilla::Scoped<ScopedUNumberFormatTraits> AutoCloseUNumberFormat;
1.33 +
1.34 +class ICUUtils
1.35 +{
1.36 +public:
1.37 +
1.38 + /**
1.39 + * This class is used to encapsulate an nsIContent object to allow lazy
1.40 + * iteration over its primary and fallback BCP 47 language tags.
1.41 + */
1.42 + class LanguageTagIterForContent {
1.43 + public:
1.44 + LanguageTagIterForContent(nsIContent* aContent)
1.45 + : mContent(aContent)
1.46 + , mCurrentFallbackIndex(-1)
1.47 + {}
1.48 +
1.49 + /**
1.50 + * Used to iterate over the nsIContent object's primary language tag and
1.51 + * its fallbacks tags. The following sources of language tag information
1.52 + * are tried in turn:
1.53 + *
1.54 + * 1) the "lang" of the nsIContent object (which is based on the 'lang'/
1.55 + * 'xml:lang' attribute on itself or the nearest ancestor to have such
1.56 + * an attribute, if any);
1.57 + * 2) the Content-Language HTTP pragma directive or HTTP header;
1.58 + * 3) the configured language tag of the user-agent.
1.59 + *
1.60 + * Once all fallbacks have been exhausted then this function will set
1.61 + * aBCP47LangTag to the empty string.
1.62 + */
1.63 + void GetNext(nsACString& aBCP47LangTag);
1.64 +
1.65 + bool IsAtStart() const {
1.66 + return mCurrentFallbackIndex < 0;
1.67 + }
1.68 +
1.69 + private:
1.70 + nsIContent* mContent;
1.71 + int8_t mCurrentFallbackIndex;
1.72 + };
1.73 +
1.74 + /**
1.75 + * Attempts to localize aValue and return the result via the aLocalizedValue
1.76 + * outparam. Returns true on success. Returns false on failure, in which
1.77 + * case aLocalizedValue will be untouched.
1.78 + */
1.79 + static bool LocalizeNumber(double aValue,
1.80 + LanguageTagIterForContent& aLangTags,
1.81 + nsAString& aLocalizedValue);
1.82 +
1.83 + /**
1.84 + * Parses the localized number that is serialized in aValue using aLangTags
1.85 + * and returns the result as a double. Returns NaN on failure.
1.86 + */
1.87 + static double ParseNumber(nsAString& aValue,
1.88 + LanguageTagIterForContent& aLangTags);
1.89 +
1.90 + static void AssignUCharArrayToString(UChar* aICUString,
1.91 + int32_t aLength,
1.92 + nsAString& aMozString);
1.93 +
1.94 +#if 0
1.95 + // Currently disabled because using C++ API doesn't play nicely with enabling
1.96 + // system ICU.
1.97 +
1.98 + /**
1.99 + * Converts an IETF BCP 47 language code to an ICU Locale.
1.100 + */
1.101 + static Locale BCP47CodeToLocale(const nsAString& aBCP47Code);
1.102 +
1.103 + static void ToMozString(UnicodeString& aICUString, nsAString& aMozString);
1.104 + static void ToICUString(nsAString& aMozString, UnicodeString& aICUString);
1.105 +#endif
1.106 +};
1.107 +
1.108 +#endif /* ENABLE_INTL_API */
1.109 +#endif /* MOZILLA_INTERNAL_API */
1.110 +
1.111 +#endif /* mozilla_ICUUtils_h__ */
1.112 +
