1 files changed, 284 insertions, 0 deletions
diff --git a/intl/unicharutil/util/ICUUtils.cpp b/intl/unicharutil/util/ICUUtils.cpp
new file mode 100644
index 000000000..2bb33d854
--- /dev/null
+++ b/intl/unicharutil/util/ICUUtils.cpp
@@ -0,0 +1,284 @@
+/* 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/. */
+
+#ifdef MOZILLA_INTERNAL_API
+#ifdef ENABLE_INTL_API
+
+#include "ICUUtils.h"
+#include "mozilla/Preferences.h"
+#include "nsIContent.h"
+#include "nsIDocument.h"
+#include "nsIToolkitChromeRegistry.h"
+#include "nsStringGlue.h"
+#include "unicode/uloc.h"
+#include "unicode/unum.h"
+
+using namespace mozilla;
+
+/**
+ * This pref just controls whether we format the number with grouping separator
+ * characters when the internal value is set or updated. It does not stop the
+ * user from typing in a number and using grouping separators.
+ */
+static bool gLocaleNumberGroupingEnabled;
+static const char LOCALE_NUMBER_GROUPING_PREF_STR[] = "dom.forms.number.grouping";
+
+static bool
+LocaleNumberGroupingIsEnabled()
+{
+  static bool sInitialized = false;
+
+  if (!sInitialized) {
+    /* check and register ourselves with the pref */
+    Preferences::AddBoolVarCache(&gLocaleNumberGroupingEnabled,
+                                 LOCALE_NUMBER_GROUPING_PREF_STR,
+                                 false);
+    sInitialized = true;
+  }
+
+  return gLocaleNumberGroupingEnabled;
+}
+
+void
+ICUUtils::LanguageTagIterForContent::GetNext(nsACString& aBCP47LangTag)
+{
+  if (mCurrentFallbackIndex < 0) {
+    mCurrentFallbackIndex = 0;
+    // Try the language specified by a 'lang'/'xml:lang' attribute on mContent
+    // or any ancestor, if such an attribute is specified:
+    nsAutoString lang;
+    mContent->GetLang(lang);
+    if (!lang.IsEmpty()) {
+      aBCP47LangTag = NS_ConvertUTF16toUTF8(lang);
+      return;
+    }
+  }
+
+  if (mCurrentFallbackIndex < 1) {
+    mCurrentFallbackIndex = 1;
+    // Else try the language specified by any Content-Language HTTP header or
+    // pragma directive:
+    nsIDocument* doc = mContent->OwnerDoc();
+    nsAutoString lang;
+    doc->GetContentLanguage(lang);
+    if (!lang.IsEmpty()) {
+      aBCP47LangTag = NS_ConvertUTF16toUTF8(lang);
+      return;
+    }
+  }
+
+  if (mCurrentFallbackIndex < 2) {
+    mCurrentFallbackIndex = 2;
+    // Else try the user-agent's locale:
+    nsCOMPtr<nsIToolkitChromeRegistry> cr =
+      mozilla::services::GetToolkitChromeRegistryService();
+    nsAutoCString uaLangTag;
+    if (cr) {
+      cr->GetSelectedLocale(NS_LITERAL_CSTRING("global"), true, uaLangTag);
+    }
+    if (!uaLangTag.IsEmpty()) {
+      aBCP47LangTag = uaLangTag;
+      return;
+    }
+  }
+
+  // TODO: Probably not worth it, but maybe have a fourth fallback to using
+  // the OS locale?
+
+  aBCP47LangTag.Truncate(); // Signal iterator exhausted
+}
+
+/* static */ bool
+ICUUtils::LocalizeNumber(double aValue,
+                         LanguageTagIterForContent& aLangTags,
+                         nsAString& aLocalizedValue)
+{
+  MOZ_ASSERT(aLangTags.IsAtStart(), "Don't call Next() before passing");
+
+  static const int32_t kBufferSize = 256;
+
+  UChar buffer[kBufferSize];
+
+  nsAutoCString langTag;
+  aLangTags.GetNext(langTag);
+  while (!langTag.IsEmpty()) {
+    UErrorCode status = U_ZERO_ERROR;
+    AutoCloseUNumberFormat format(unum_open(UNUM_DECIMAL, nullptr, 0,
+                                            langTag.get(), nullptr, &status));
+    unum_setAttribute(format, UNUM_GROUPING_USED,
+                      LocaleNumberGroupingIsEnabled());
+    // ICU default is a maximum of 3 significant fractional digits. We don't
+    // want that limit, so we set it to the maximum that a double can represent
+    // (14-16 decimal fractional digits).
+    unum_setAttribute(format, UNUM_MAX_FRACTION_DIGITS, 16);
+    int32_t length = unum_formatDouble(format, aValue, buffer, kBufferSize,
+                                       nullptr, &status);
+    NS_ASSERTION(length < kBufferSize &&
+                 status != U_BUFFER_OVERFLOW_ERROR &&
+                 status != U_STRING_NOT_TERMINATED_WARNING,
+                 "Need a bigger buffer?!");
+    if (U_SUCCESS(status)) {
+      ICUUtils::AssignUCharArrayToString(buffer, length, aLocalizedValue);
+      return true;
+    }
+    aLangTags.GetNext(langTag);
+  }
+  return false;
+}
+
+/* static */ double
+ICUUtils::ParseNumber(nsAString& aValue,
+                      LanguageTagIterForContent& aLangTags)
+{
+  MOZ_ASSERT(aLangTags.IsAtStart(), "Don't call Next() before passing");
+
+  if (aValue.IsEmpty()) {
+    return std::numeric_limits<float>::quiet_NaN();
+  }
+
+  uint32_t length = aValue.Length();
+
+  nsAutoCString langTag;
+  aLangTags.GetNext(langTag);
+  while (!langTag.IsEmpty()) {
+    UErrorCode status = U_ZERO_ERROR;
+    AutoCloseUNumberFormat format(unum_open(UNUM_DECIMAL, nullptr, 0,
+                                            langTag.get(), nullptr, &status));
+    int32_t parsePos = 0;
+    static_assert(sizeof(UChar) == 2 && sizeof(nsAString::char_type) == 2,
+                  "Unexpected character size - the following cast is unsafe");
+    double val = unum_parseDouble(format,
+                                  (const UChar*)PromiseFlatString(aValue).get(),
+                                  length, &parsePos, &status);
+    if (U_SUCCESS(status) && parsePos == (int32_t)length) {
+      return val;
+    }
+    aLangTags.GetNext(langTag);
+  }
+  return std::numeric_limits<float>::quiet_NaN();
+}
+
+/* static */ void
+ICUUtils::AssignUCharArrayToString(UChar* aICUString,
+                                   int32_t aLength,
+                                   nsAString& aMozString)
+{
+  // Both ICU's UnicodeString and Mozilla's nsAString use UTF-16, so we can
+  // cast here.
+
+  static_assert(sizeof(UChar) == 2 && sizeof(nsAString::char_type) == 2,
+                "Unexpected character size - the following cast is unsafe");
+
+  aMozString.Assign((const nsAString::char_type*)aICUString, aLength);
+
+  NS_ASSERTION((int32_t)aMozString.Length() == aLength, "Conversion failed");
+}
+
+/* static */ nsresult
+ICUUtils::UErrorToNsResult(const UErrorCode aErrorCode)
+{
+  if (U_SUCCESS(aErrorCode)) {
+    return NS_OK;
+  }
+
+  switch(aErrorCode) {
+    case U_ILLEGAL_ARGUMENT_ERROR:
+      return NS_ERROR_INVALID_ARG;
+
+    case U_MEMORY_ALLOCATION_ERROR:
+      return NS_ERROR_OUT_OF_MEMORY;
+
+    default:
+      return NS_ERROR_FAILURE;
+  }
+}
+
+#if 0
+/* static */ Locale
+ICUUtils::BCP47CodeToLocale(const nsAString& aBCP47Code)
+{
+  MOZ_ASSERT(!aBCP47Code.IsEmpty(), "Don't pass an empty BCP 47 code");
+
+  Locale locale;
+  locale.setToBogus();
+
+  // BCP47 codes are guaranteed to be ASCII, so lossy conversion is okay
+  NS_LossyConvertUTF16toASCII bcp47code(aBCP47Code);
+
+  UErrorCode status = U_ZERO_ERROR;
+  int32_t needed;
+
+  char localeID[256];
+  needed = uloc_forLanguageTag(bcp47code.get(), localeID,
+                               PR_ARRAY_SIZE(localeID) - 1, nullptr,
+                               &status);
+  MOZ_ASSERT(needed < int32_t(PR_ARRAY_SIZE(localeID)) - 1,
+             "Need a bigger buffer");
+  if (needed <= 0 || U_FAILURE(status)) {
+    return locale;
+  }
+
+  char lang[64];
+  needed = uloc_getLanguage(localeID, lang, PR_ARRAY_SIZE(lang) - 1,
+                            &status);
+  MOZ_ASSERT(needed < int32_t(PR_ARRAY_SIZE(lang)) - 1,
+             "Need a bigger buffer");
+  if (needed <= 0 || U_FAILURE(status)) {
+    return locale;
+  }
+
+  char country[64];
+  needed = uloc_getCountry(localeID, country, PR_ARRAY_SIZE(country) - 1,
+                           &status);
+  MOZ_ASSERT(needed < int32_t(PR_ARRAY_SIZE(country)) - 1,
+             "Need a bigger buffer");
+  if (needed > 0 && U_SUCCESS(status)) {
+    locale = Locale(lang, country);
+  }
+
+  if (locale.isBogus()) {
+    // Using the country resulted in a bogus Locale, so try with only the lang
+    locale = Locale(lang);
+  }
+
+  return locale;
+}
+
+/* static */ void
+ICUUtils::ToMozString(UnicodeString& aICUString, nsAString& aMozString)
+{
+  // Both ICU's UnicodeString and Mozilla's nsAString use UTF-16, so we can
+  // cast here.
+
+  static_assert(sizeof(UChar) == 2 && sizeof(nsAString::char_type) == 2,
+                "Unexpected character size - the following cast is unsafe");
+
+  const nsAString::char_type* buf =
+    (const nsAString::char_type*)aICUString.getTerminatedBuffer();
+  aMozString.Assign(buf);
+
+  NS_ASSERTION(aMozString.Length() == (uint32_t)aICUString.length(),
+               "Conversion failed");
+}
+
+/* static */ void
+ICUUtils::ToICUString(nsAString& aMozString, UnicodeString& aICUString)
+{
+  // Both ICU's UnicodeString and Mozilla's nsAString use UTF-16, so we can
+  // cast here.
+
+  static_assert(sizeof(UChar) == 2 && sizeof(nsAString::char_type) == 2,
+                "Unexpected character size - the following cast is unsafe");
+
+  aICUString.setTo((UChar*)PromiseFlatString(aMozString).get(),
+                   aMozString.Length());
+
+  NS_ASSERTION(aMozString.Length() == (uint32_t)aICUString.length(),
+               "Conversion failed");
+}
+#endif
+
+#endif /* ENABLE_INTL_API */
+#endif /* MOZILLA_INTERNAL_API */
+