1 files changed, 114 insertions, 0 deletions
diff --git a/intl/unicharutil/util/ICUUtils.h b/intl/unicharutil/util/ICUUtils.h
new file mode 100644
index 000000000..1fa8d4cc0
--- /dev/null
+++ b/intl/unicharutil/util/ICUUtils.h
@@ -0,0 +1,114 @@
+/* -*- 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__ */
+