Restore accidentally deleted src/extensions/experimental/i18n.js

Review URL: http://codereview.chromium.org/7205030

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8335 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

diff --git a/src/extensions/experimental/i18n.js b/src/extensions/experimental/i18n.js
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+// Copyright 2006-2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// TODO(cira): Rename v8Locale into LocaleInfo once we have stable API.
+/**
+ * LocaleInfo class is an aggregate class of all i18n API calls.
+ * @param {Object} settings - localeID and regionID to create LocaleInfo from.
+ *   {Array.<string>|string} settings.localeID -
+ *     Unicode identifier of the locale.
+ *     See http://unicode.org/reports/tr35/#BCP_47_Conformance
+ *   {string} settings.regionID - ISO3166 region ID with addition of
+ *     invalid, undefined and reserved region codes.
+ * @constructor
+ */
+v8Locale = function(settings) {
+  native function NativeJSLocale();
+
+  // Assume user wanted to do v8Locale("sr");
+  if (typeof(settings) === "string") {
+    settings = {'localeID': settings};
+  }
+
+  var properties = NativeJSLocale(
+      v8Locale.__createSettingsOrDefault(settings, {'localeID': 'root'}));
+
+  // Keep the resolved ICU locale ID around to avoid resolving localeID to
+  // ICU locale ID every time BreakIterator, Collator and so forth are called.
+  this.__icuLocaleID = properties.icuLocaleID;
+  this.options = {'localeID': properties.localeID,
+                  'regionID': properties.regionID};
+};
+
+/**
+ * Clones existing locale with possible overrides for some of the options.
+ * @param {!Object} settings - overrides for current locale settings.
+ * @returns {Object} - new LocaleInfo object.
+ */
+v8Locale.prototype.derive = function(settings) {
+  return new v8Locale(
+      v8Locale.__createSettingsOrDefault(settings, this.options));
+};
+
+/**
+ * v8BreakIterator class implements locale aware segmenatation.
+ * It is not part of EcmaScript proposal.
+ * @param {Object} locale - locale object to pass to break
+ *   iterator implementation.
+ * @param {string} type - type of segmenatation:
+ *   - character
+ *   - word
+ *   - sentence
+ *   - line
+ * @private
+ * @constructor
+ */
+v8Locale.v8BreakIterator = function(locale, type) {
+  native function NativeJSBreakIterator();
+
+  locale = v8Locale.__createLocaleOrDefault(locale);
+  // BCP47 ID would work in this case, but we use ICU locale for consistency.
+  var iterator = NativeJSBreakIterator(locale.__icuLocaleID, type);
+  iterator.type = type;
+  return iterator;
+};
+
+/**
+ * Type of the break we encountered during previous iteration.
+ * @type{Enum}
+ */
+v8Locale.v8BreakIterator.BreakType = {
+  'unknown': -1,
+  'none': 0,
+  'number': 100,
+  'word': 200,
+  'kana': 300,
+  'ideo': 400
+};
+
+/**
+ * Creates new v8BreakIterator based on current locale.
+ * @param {string} - type of segmentation. See constructor.
+ * @returns {Object} - new v8BreakIterator object.
+ */
+v8Locale.prototype.v8CreateBreakIterator = function(type) {
+  return new v8Locale.v8BreakIterator(this, type);
+};
+
+// TODO(jungshik): Set |collator.options| to actually recognized / resolved
+// values.
+/**
+ * Collator class implements locale-aware sort.
+ * @param {Object} locale - locale object to pass to collator implementation.
+ * @param {Object} settings - collation flags:
+ *   - ignoreCase
+ *   - ignoreAccents
+ *   - numeric
+ * @private
+ * @constructor
+ */
+v8Locale.Collator = function(locale, settings) {
+  native function NativeJSCollator();
+
+  locale = v8Locale.__createLocaleOrDefault(locale);
+  var collator = NativeJSCollator(
+      locale.__icuLocaleID, v8Locale.__createSettingsOrDefault(settings, {}));
+  return collator;
+};
+
+/**
+ * Creates new Collator based on current locale.
+ * @param {Object} - collation flags. See constructor.
+ * @returns {Object} - new Collator object.
+ */
+v8Locale.prototype.createCollator = function(settings) {
+  return new v8Locale.Collator(this, settings);
+};
+
+/**
+ * DateTimeFormat class implements locale-aware date and time formatting.
+ * Constructor is not part of public API.
+ * @param {Object} locale - locale object to pass to formatter.
+ * @param {Object} settings - formatting flags:
+ *   - skeleton
+ *   - dateType
+ *   - timeType
+ *   - calendar
+ * @private
+ * @constructor
+ */
+v8Locale.__DateTimeFormat = function(locale, settings) {
+  native function NativeJSDateTimeFormat();
+
+  settings = v8Locale.__createSettingsOrDefault(settings, {});
+
+  var cleanSettings = {};
+  if (settings.hasOwnProperty('skeleton')) {
+    cleanSettings['skeleton'] = settings['skeleton'];
+  } else {
+    cleanSettings = {};
+    if (settings.hasOwnProperty('dateType')) {
+      var dt = settings['dateType'];
+      if (!/^short|medium|long|full$/.test(dt)) dt = 'short';
+      cleanSettings['dateType'] = dt;
+    }
+
+    if (settings.hasOwnProperty('timeType')) {
+      var tt = settings['timeType'];
+      if (!/^short|medium|long|full$/.test(tt)) tt = 'short';
+      cleanSettings['timeType'] = tt;
+    }
+  }
+
+  // Default is to show short date and time.
+  if (!cleanSettings.hasOwnProperty('skeleton') &&
+      !cleanSettings.hasOwnProperty('dateType') &&
+      !cleanSettings.hasOwnProperty('timeType')) {
+    cleanSettings = {'dateType': 'short',
+                     'timeType': 'short'};
+  }
+
+  locale = v8Locale.__createLocaleOrDefault(locale);
+  var formatter = NativeJSDateTimeFormat(locale.__icuLocaleID, cleanSettings);
+
+  // NativeJSDateTimeFormat creates formatter.options for us, we just need
+  // to append actual settings to it.
+  for (key in cleanSettings) {
+    formatter.options[key] = cleanSettings[key];
+  }
+
+  /**
+   * Clones existing date time format with possible overrides for some
+   * of the options.
+   * @param {!Object} overrideSettings - overrides for current format settings.
+   * @returns {Object} - new DateTimeFormat object.
+   * @public
+   */
+  formatter.derive = function(overrideSettings) {
+    // To remove a setting user can specify undefined as its value. We'll remove
+    // it from the map in that case.
+    for (var prop in overrideSettings) {
+      if (settings.hasOwnProperty(prop) && !overrideSettings[prop]) {
+        delete settings[prop];
+      }
+    }
+    return new v8Locale.__DateTimeFormat(
+        locale, v8Locale.__createSettingsOrDefault(overrideSettings, settings));
+  };
+
+  return formatter;
+};
+
+/**
+ * Creates new DateTimeFormat based on current locale.
+ * @param {Object} - formatting flags. See constructor.
+ * @returns {Object} - new DateTimeFormat object.
+ */
+v8Locale.prototype.createDateTimeFormat = function(settings) {
+  return new v8Locale.__DateTimeFormat(this, settings);
+};
+
+/**
+ * Merges user settings and defaults.
+ * Settings that are not of object type are rejected.
+ * Actual property values are not validated, but whitespace is trimmed if they
+ * are strings.
+ * @param {!Object} settings - user provided settings.
+ * @param {!Object} defaults - default values for this type of settings.
+ * @returns {Object} - valid settings object.
+ * @private
+ */
+v8Locale.__createSettingsOrDefault = function(settings, defaults) {
+  if (!settings || typeof(settings) !== 'object' ) {
+    return defaults;
+  }
+  for (var key in defaults) {
+    if (!settings.hasOwnProperty(key)) {
+      settings[key] = defaults[key];
+    }
+  }
+  // Clean up settings.
+  for (var key in settings) {
+    // Trim whitespace.
+    if (typeof(settings[key]) === "string") {
+      settings[key] = settings[key].trim();
+    }
+    // Remove all properties that are set to undefined/null. This allows
+    // derive method to remove a setting we don't need anymore.
+    if (!settings[key]) {
+      delete settings[key];
+    }
+  }
+
+  return settings;
+};
+
+/**
+ * If locale is valid (defined and of v8Locale type) we return it. If not
+ * we create default locale and return it.
+ * @param {!Object} locale - user provided locale.
+ * @returns {Object} - v8Locale object.
+ * @private
+ */
+v8Locale.__createLocaleOrDefault = function(locale) {
+  if (!locale || !(locale instanceof v8Locale)) {
+    return new v8Locale();
+  } else {
+    return locale;
+  }
+};