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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /intl/unicharutil/util/ICUUtils.h
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Add m-esr52 at 52.6.0
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diff --git a/intl/unicharutil/util/ICUUtils.h b/intl/unicharutil/util/ICUUtils.h
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+/* -*- 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__ */
+