1 files changed, 276 insertions, 0 deletions
diff --git a/js/src/builtin/intl/DisplayNames.js b/js/src/builtin/intl/DisplayNames.js
new file mode 100644
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+++ b/js/src/builtin/intl/DisplayNames.js
@@ -0,0 +1,276 @@
+/* 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/. */
+
+/**
+ * Intl.DisplayNames internal properties.
+ */
+var displayNamesInternalProperties = {
+    localeData: function() // eslint-disable-line object-shorthand
+    {
+        // Intl.DisplayNames doesn't support any extension keys.
+        return {};
+    },
+    relevantExtensionKeys: []
+};
+
+var mozDisplayNamesInternalProperties = {
+    localeData: function() // eslint-disable-line object-shorthand
+    {
+        return {
+            ca: intl_availableCalendars,
+            default: {
+                ca: intl_defaultCalendar,
+            },
+        };
+    },
+    relevantExtensionKeys: ["ca"]
+};
+
+/**
+ * Intl.DisplayNames ( [ locales [ , options ] ] )
+ *
+ * Compute an internal properties object from |lazyDisplayNamesData|.
+ */
+function resolveDisplayNamesInternals(lazyDisplayNamesData) {
+    assert(IsObject(lazyDisplayNamesData), "lazy data not an object?");
+
+    var internalProps = std_Object_create(null);
+
+    var mozExtensions = lazyDisplayNamesData.mozExtensions;
+
+    var DisplayNames = mozExtensions ?
+                       mozDisplayNamesInternalProperties :
+                       displayNamesInternalProperties;
+
+    // Compute effective locale.
+
+    // Step 7.
+    var localeData = DisplayNames.localeData;
+
+    // Step 10.
+    var r = ResolveLocale("DisplayNames",
+                          lazyDisplayNamesData.requestedLocales,
+                          lazyDisplayNamesData.opt,
+                          DisplayNames.relevantExtensionKeys,
+                          localeData);
+    // Step 12.
+    internalProps.style = lazyDisplayNamesData.style;
+
+    // Step 14.
+    internalProps.type = lazyDisplayNamesData.type;
+
+    // Step 16.
+    internalProps.fallback = lazyDisplayNamesData.fallback;
+
+    // Step 17.
+    internalProps.locale = r.locale;
+
+    if (mozExtensions) {
+        internalProps.calendar = r.ca;
+    }
+
+    // The caller is responsible for associating |internalProps| with the right
+    // object using |setInternalProperties|.
+    return internalProps;
+}
+
+/**
+ * Returns an object containing the DisplayNames internal properties of |obj|.
+ */
+function getDisplayNamesInternals(obj) {
+    assert(IsObject(obj), "getDisplayNamesInternals called with non-object");
+    assert(GuardToDisplayNames(obj) !== null, "getDisplayNamesInternals called with non-DisplayNames");
+
+    var internals = getIntlObjectInternals(obj);
+    assert(internals.type === "DisplayNames", "bad type escaped getIntlObjectInternals");
+
+    // If internal properties have already been computed, use them.
+    var internalProps = maybeInternalProperties(internals);
+    if (internalProps)
+        return internalProps;
+
+    // Otherwise it's time to fully create them.
+    internalProps = resolveDisplayNamesInternals(internals.lazyData);
+    setInternalProperties(internals, internalProps);
+    return internalProps;
+}
+
+/**
+ * Intl.DisplayNames ( [ locales [ , options ] ] )
+ *
+ * Initializes an object as a DisplayNames.
+ *
+ * This method is complicated a moderate bit by its implementing initialization
+ * as a *lazy* concept.  Everything that must happen now, does -- but we defer
+ * all the work we can until the object is actually used as a DisplayNames.
+ * This later work occurs in |resolveDisplayNamesInternals|; steps not noted
+ * here occur there.
+ */
+function InitializeDisplayNames(displayNames, locales, options, mozExtensions) {
+    assert(IsObject(displayNames), "InitializeDisplayNames called with non-object");
+    assert(GuardToDisplayNames(displayNames) !== null, "InitializeDisplayNames called with non-DisplayNames");
+
+    // Lazy DisplayNames data has the following structure:
+    //
+    //   {
+    //     requestedLocales: List of locales,
+    //
+    //     opt: // opt object computed in InitializeDisplayNames
+    //       {
+    //         localeMatcher: "lookup" / "best fit",
+    //
+    //         ca: string matching a Unicode extension type, // optional
+    //       }
+    //
+    //     localeMatcher: "lookup" / "best fit",
+    //
+    //     style: "narrow" / "short" / "long",
+    //
+    //     type: "language" / "region" / "script" / "currency" / "weekday" /
+    //           "month" / "quarter" / "dayPeriod" / "dateTimeField"
+    //
+    //     fallback: "code" / "none",
+    //
+    //     mozExtensions: true / false,
+    //   }
+    //
+    // Note that lazy data is only installed as a final step of initialization,
+    // so every DisplayNames lazy data object has *all* these properties, never a
+    // subset of them.
+    var lazyDisplayNamesData = std_Object_create(null);
+
+    // Step 3.
+    var requestedLocales = CanonicalizeLocaleList(locales);
+    lazyDisplayNamesData.requestedLocales = requestedLocales;
+
+    // Step 4.
+    options = ToObject(options);
+
+    // Step 5.
+    var opt = new Record();
+    lazyDisplayNamesData.opt = opt;
+    lazyDisplayNamesData.mozExtensions = mozExtensions;
+
+    // Steps 7-8.
+    var matcher = GetOption(options, "localeMatcher", "string", ["lookup", "best fit"], "best fit");
+    opt.localeMatcher = matcher;
+
+    if (mozExtensions) {
+        var calendar = GetOption(options, "calendar", "string", undefined, undefined);
+
+        if (calendar !== undefined) {
+            calendar = intl_ValidateAndCanonicalizeUnicodeExtensionType(calendar, "calendar", "ca");
+        }
+
+        opt.ca = calendar;
+    }
+
+    // Step 10.
+    var style = GetOption(options, "style", "string", ["narrow", "short", "long"], "long");
+
+    // Step 11.
+    lazyDisplayNamesData.style = style;
+
+    // Step 12.
+    var type;
+    if (mozExtensions) {
+        type = GetOption(options, "type", "string",
+                         ["language", "region", "script", "currency", "weekday", "month",
+                          "quarter", "dayPeriod", "dateTimeField"], undefined);
+    } else {
+        type = GetOption(options, "type", "string",
+                         ["language", "region", "script", "currency"], undefined);
+    }
+
+    // Step 13.
+    if (type === undefined) {
+        ThrowTypeError(JSMSG_UNDEFINED_TYPE);
+    }
+
+    // Step 14.
+    lazyDisplayNamesData.type = type;
+
+    // Step 15.
+    var fallback = GetOption(options, "fallback", "string", ["code", "none"], "code");
+
+    // Step 16.
+    lazyDisplayNamesData.fallback = fallback;
+
+    // We've done everything that must be done now: mark the lazy data as fully
+    // computed and install it.
+    initializeIntlObject(displayNames, "DisplayNames", lazyDisplayNamesData);
+}
+
+/**
+ * Returns the subset of the given locale list for which this locale list has a
+ * matching (possibly fallback) locale. Locales appear in the same order in the
+ * returned list as in the input list.
+ */
+function Intl_DisplayNames_supportedLocalesOf(locales /*, options*/) {
+    var options = arguments.length > 1 ? arguments[1] : undefined;
+
+    // Step 1.
+    var availableLocales = "DisplayNames";
+
+    // Step 2.
+    var requestedLocales = CanonicalizeLocaleList(locales);
+
+    // Step 3.
+    return SupportedLocales(availableLocales, requestedLocales, options);
+}
+
+/**
+ * Returns the resolved options for a DisplayNames object.
+ */
+function Intl_DisplayNames_of(code) {
+  // Step 1.
+  var displayNames = this;
+
+  // Steps 2-3.
+  if (!IsObject(displayNames) || (displayNames = GuardToDisplayNames(displayNames)) === null) {
+      return callFunction(CallDisplayNamesMethodIfWrapped, this, "Intl_DisplayNames_of");
+  }
+
+  code = ToString(code);
+
+  var internals = getDisplayNamesInternals(displayNames);
+
+  // Unpack the internals object to avoid a slow runtime to selfhosted JS call
+  // in |intl_ComputeDisplayName()|.
+  var {locale, calendar = "", style, type, fallback} = internals;
+
+  // Steps 5-10.
+  return intl_ComputeDisplayName(displayNames, locale, calendar, style, fallback, type, code);
+}
+
+/**
+ * Returns the resolved options for a DisplayNames object.
+ */
+function Intl_DisplayNames_resolvedOptions() {
+    // Step 1.
+    var displayNames = this;
+
+    // Steps 2-3.
+    if (!IsObject(displayNames) || (displayNames = GuardToDisplayNames(displayNames)) === null) {
+        return callFunction(CallDisplayNamesMethodIfWrapped, this,
+                            "Intl_DisplayNames_resolvedOptions");
+    }
+
+    var internals = getDisplayNamesInternals(displayNames);
+
+    // Steps 4-5.
+    var options = {
+        locale: internals.locale,
+        style: internals.style,
+        type: internals.type,
+        fallback: internals.fallback,
+    };
+
+    if (hasOwn("calendar", internals)) {
+        options.calendar = internals.calendar;
+    }
+
+    // Step 6.
+    return options;
+}