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comparison: intl/unicharutil/util/ICUUtils.h
intl/unicharutil/util/ICUUtils.h
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:b1fc93c54b05 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef mozilla_ICUUtils_h__ | |
| 7 #define mozilla_ICUUtils_h__ | |
| 8 | |
| 9 // We only build the ICU utils if we're building ICU: | |
| 10 #ifdef ENABLE_INTL_API | |
| 11 | |
| 12 // The ICU utils implementation needs internal things like XPCOM strings and | |
| 13 // nsGkAtom, so we only build when included into internal libs: | |
| 14 #ifdef MOZILLA_INTERNAL_API | |
| 15 | |
| 16 #include "mozilla/Scoped.h" | |
| 17 #include "nsStringGlue.h" | |
| 18 #include "unicode/unum.h" // for UNumberFormat | |
| 19 | |
| 20 class nsIContent; | |
| 21 | |
| 22 namespace { | |
| 23 struct ScopedUNumberFormatTraits { | |
| 24 typedef UNumberFormat* type; | |
| 25 static type empty() { return nullptr; } | |
| 26 static void release(type handle) { if (handle) unum_close(handle); } | |
| 27 }; | |
| 28 }; | |
| 29 typedef mozilla::Scoped<ScopedUNumberFormatTraits> AutoCloseUNumberFormat; | |
| 30 | |
| 31 class ICUUtils | |
| 32 { | |
| 33 public: | |
| 34 | |
| 35 /** | |
| 36 * This class is used to encapsulate an nsIContent object to allow lazy | |
| 37 * iteration over its primary and fallback BCP 47 language tags. | |
| 38 */ | |
| 39 class LanguageTagIterForContent { | |
| 40 public: | |
| 41 LanguageTagIterForContent(nsIContent* aContent) | |
| 42 : mContent(aContent) | |
| 43 , mCurrentFallbackIndex(-1) | |
| 44 {} | |
| 45 | |
| 46 /** | |
| 47 * Used to iterate over the nsIContent object's primary language tag and | |
| 48 * its fallbacks tags. The following sources of language tag information | |
| 49 * are tried in turn: | |
| 50 * | |
| 51 * 1) the "lang" of the nsIContent object (which is based on the 'lang'/ | |
| 52 * 'xml:lang' attribute on itself or the nearest ancestor to have such | |
| 53 * an attribute, if any); | |
| 54 * 2) the Content-Language HTTP pragma directive or HTTP header; | |
| 55 * 3) the configured language tag of the user-agent. | |
| 56 * | |
| 57 * Once all fallbacks have been exhausted then this function will set | |
| 58 * aBCP47LangTag to the empty string. | |
| 59 */ | |
| 60 void GetNext(nsACString& aBCP47LangTag); | |
| 61 | |
| 62 bool IsAtStart() const { | |
| 63 return mCurrentFallbackIndex < 0; | |
| 64 } | |
| 65 | |
| 66 private: | |
| 67 nsIContent* mContent; | |
| 68 int8_t mCurrentFallbackIndex; | |
| 69 }; | |
| 70 | |
| 71 /** | |
| 72 * Attempts to localize aValue and return the result via the aLocalizedValue | |
| 73 * outparam. Returns true on success. Returns false on failure, in which | |
| 74 * case aLocalizedValue will be untouched. | |
| 75 */ | |
| 76 static bool LocalizeNumber(double aValue, | |
| 77 LanguageTagIterForContent& aLangTags, | |
| 78 nsAString& aLocalizedValue); | |
| 79 | |
| 80 /** | |
| 81 * Parses the localized number that is serialized in aValue using aLangTags | |
| 82 * and returns the result as a double. Returns NaN on failure. | |
| 83 */ | |
| 84 static double ParseNumber(nsAString& aValue, | |
| 85 LanguageTagIterForContent& aLangTags); | |
| 86 | |
| 87 static void AssignUCharArrayToString(UChar* aICUString, | |
| 88 int32_t aLength, | |
| 89 nsAString& aMozString); | |
| 90 | |
| 91 #if 0 | |
| 92 // Currently disabled because using C++ API doesn't play nicely with enabling | |
| 93 // system ICU. | |
| 94 | |
| 95 /** | |
| 96 * Converts an IETF BCP 47 language code to an ICU Locale. | |
| 97 */ | |
| 98 static Locale BCP47CodeToLocale(const nsAString& aBCP47Code); | |
| 99 | |
| 100 static void ToMozString(UnicodeString& aICUString, nsAString& aMozString); | |
| 101 static void ToICUString(nsAString& aMozString, UnicodeString& aICUString); | |
| 102 #endif | |
| 103 }; | |
| 104 | |
| 105 #endif /* ENABLE_INTL_API */ | |
| 106 #endif /* MOZILLA_INTERNAL_API */ | |
| 107 | |
| 108 #endif /* mozilla_ICUUtils_h__ */ | |
| 109 |
