Adding DateTimeFormat class to i18n API with following methods:

- format
- getWeekdays
- getMonths
- get Eras
- getAmPm

TEST=Visit i18n.kaziprst.org/datetimeformat.html
Review URL: http://codereview.chromium.org/7014019

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7967 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/extensions/experimental/datetime-format.h

+// Copyright 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.
+
+#ifndef V8_EXTENSIONS_EXPERIMENTAL_DATETIME_FORMAT_H_
+#define V8_EXTENSIONS_EXPERIMENTAL_DATETIME_FORMAT_H_
+
+#include <v8.h>
+
+#include "unicode/uversion.h"
+
+namespace U_ICU_NAMESPACE {
+class SimpleDateFormat;
+}
+
+namespace v8 {
+namespace internal {
+
+class DateTimeFormat {
+ public:
+  static v8::Handle<v8::Value> JSDateTimeFormat(const v8::Arguments& args);
+
+  // Helper methods for various bindings.
+
+  // Unpacks date format object from corresponding JavaScript object.
+  static icu::SimpleDateFormat* UnpackDateTimeFormat(
+      v8::Handle<v8::Object> obj);
+
+  // Release memory we allocated for the DateFormat once the JS object that
+  // holds the pointer gets garbage collected.
+  static void DeleteDateTimeFormat(v8::Persistent<v8::Value> object,
+                                   void* param);
+
+  // Formats date and returns corresponding string.
+  static v8::Handle<v8::Value> Format(const v8::Arguments& args);
+
+  // All date time symbol methods below return stand-alone names in
+  // either narrow, abbreviated or wide width.
+
+  // Get list of months.
+  static v8::Handle<v8::Value> GetMonths(const v8::Arguments& args);
+
+  // Get list of weekdays.
+  static v8::Handle<v8::Value> GetWeekdays(const v8::Arguments& args);
+
+  // Get list of eras.
+  static v8::Handle<v8::Value> GetEras(const v8::Arguments& args);
+
+  // Get list of day periods.
+  static v8::Handle<v8::Value> GetAmPm(const v8::Arguments& args);
+
+ private:
+  DateTimeFormat();
+
+  static v8::Persistent<v8::FunctionTemplate> datetime_format_template_;
+};
+
+} }  // namespace v8::internal
+
+#endif  // V8_EXTENSIONS_EXPERIMENTAL_DATETIME_FORMAT_H_

src/extensions/experimental/experimental.gyp

@@ -41,6 +41,8 @@
         'break-iterator.h',
         'collator.cc',
         'collator.h',
+        'datetime-format.cc',
+        'datetime-format.h',
         'i18n-extension.cc',
         'i18n-extension.h',
         'i18n-locale.cc',

src/extensions/experimental/i18n-extension.cc

@@ -29,6 +29,7 @@
 
 #include "break-iterator.h"
 #include "collator.h"
+#include "datetime-format.h"
 #include "i18n-locale.h"
 #include "natives.h"
 
@@ -59,6 +60,8 @@ v8::Handle<v8::FunctionTemplate> I18NExtension::GetNativeFunction(
     return v8::FunctionTemplate::New(BreakIterator::JSBreakIterator);
   } else if (name->Equals(v8::String::New("NativeJSCollator"))) {
     return v8::FunctionTemplate::New(Collator::JSCollator);
+  } else if (name->Equals(v8::String::New("NativeJSDateTimeFormat"))) {
+    return v8::FunctionTemplate::New(DateTimeFormat::JSDateTimeFormat);
   }
 
   return v8::Handle<v8::FunctionTemplate>();

src/extensions/experimental/i18n-utils.cc

@@ -29,6 +29,8 @@
 
 #include <string.h>
 
+#include "unicode/unistr.h"
+
 namespace v8 {
 namespace internal {
 
@@ -40,4 +42,27 @@ void I18NUtils::StrNCopy(char* dest, int length, const char* src) {
   dest[length - 1] = '\0';
 }
 
+// static
+bool I18NUtils::ExtractStringSetting(const v8::Handle<v8::Object>& settings,
+                                     const char* setting,
+                                     icu::UnicodeString* result) {
+  if (!setting || !result) return false;
+
+  v8::HandleScope handle_scope;
+  v8::TryCatch try_catch;
+  v8::Handle<v8::Value> value = settings->Get(v8::String::New(setting));
+  if (try_catch.HasCaught()) {
+    return false;
+  }
+  // No need to check if |value| is empty because it's taken care of
+  // by TryCatch above.
+  if (!value->IsUndefined() && !value->IsNull() && value->IsString()) {
+    v8::String::Utf8Value utf8_value(value);
+    if (*utf8_value == NULL) return false;
+    result->setTo(icu::UnicodeString::fromUTF8(*utf8_value));
+    return true;
+  }
+  return false;
+}
+
 } }  // namespace v8::internal

src/extensions/experimental/i18n-utils.h

@@ -28,6 +28,14 @@
 #ifndef V8_EXTENSIONS_EXPERIMENTAL_I18N_UTILS_H_
 #define V8_EXTENSIONS_EXPERIMENTAL_I18N_UTILS_H_
 
+#include <v8.h>
+
+#include "unicode/uversion.h"
+
+namespace U_ICU_NAMESPACE {
+class UnicodeString;
+}
+
 namespace v8 {
 namespace internal {
 
@@ -40,6 +48,12 @@ class I18NUtils {
   // TODO(cira): Find a way to use OS::SNPrintF instead.
   static void StrNCopy(char* dest, int length, const char* src);
 
+  // Extract a string setting named in |settings| and set it to |result|.
+  // Return true if it's specified. Otherwise, return false.
+  static bool ExtractStringSetting(const v8::Handle<v8::Object>& settings,
+                                   const char* setting,
+                                   icu::UnicodeString* result);
+
  private:
   I18NUtils() {}
 };

src/extensions/experimental/i18n.js

@@ -45,11 +45,11 @@ v8Locale = function(settings) {
   }
 
   var properties = NativeJSLocale(
-      v8Locale.createSettingsOrDefault_(settings, {'localeID': 'root'}));
+      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.__icuLocaleID = properties.icuLocaleID;
   this.options = {'localeID': properties.localeID,
                   'regionID': properties.regionID};
 };
@@ -61,7 +61,7 @@ v8Locale = function(settings) {
  */
 v8Locale.prototype.derive = function(settings) {
   return new v8Locale(
-      v8Locale.createSettingsOrDefault_(settings, this.options));
+      v8Locale.__createSettingsOrDefault(settings, this.options));
 };
 
 /**
@@ -79,9 +79,9 @@ v8Locale.prototype.derive = function(settings) {
 v8Locale.v8BreakIterator = function(locale, type) {
   native function NativeJSBreakIterator();
 
-  locale = v8Locale.createLocaleOrDefault_(locale);
+  locale = v8Locale.__createLocaleOrDefault(locale);
   // BCP47 ID would work in this case, but we use ICU locale for consistency.
-  var iterator = NativeJSBreakIterator(locale.__icuLocaleID__, type);
+  var iterator = NativeJSBreakIterator(locale.__icuLocaleID, type);
   iterator.type = type;
   return iterator;
 };
@@ -122,21 +122,102 @@ v8Locale.prototype.v8CreateBreakIterator = function(type) {
 v8Locale.Collator = function(locale, settings) {
   native function NativeJSCollator();
 
-  locale = v8Locale.createLocaleOrDefault_(locale);
+  locale = v8Locale.__createLocaleOrDefault(locale);
   var collator = NativeJSCollator(
-      locale.__icuLocaleID__, v8Locale.createSettingsOrDefault_(settings, {}));
+      locale.__icuLocaleID, v8Locale.__createSettingsOrDefault(settings, {}));
   return collator;
 };
 
 /**
  * Creates new Collator based on current locale.
  * @param {Object} - collation flags. See constructor.
- * @returns {Object} - new v8BreakIterator object.
+ * @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
+ * @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.
+   */
+  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.
@@ -146,7 +227,7 @@ v8Locale.prototype.createCollator = function(settings) {
  * @param {!Object} defaults - default values for this type of settings.
  * @returns {Object} - valid settings object.
  */
-v8Locale.createSettingsOrDefault_ = function(settings, defaults) {
+v8Locale.__createSettingsOrDefault = function(settings, defaults) {
   if (!settings || typeof(settings) !== 'object' ) {
     return defaults;
   }
@@ -155,11 +236,17 @@ v8Locale.createSettingsOrDefault_ = function(settings, defaults) {
       settings[key] = defaults[key];
     }
   }
-  // Clean up values, like trimming whitespace.
+  // 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;
@@ -171,7 +258,7 @@ v8Locale.createSettingsOrDefault_ = function(settings, defaults) {
  * @param {!Object} locale - user provided locale.
  * @returns {Object} - v8Locale object.
  */
-v8Locale.createLocaleOrDefault_ = function(locale) {
+v8Locale.__createLocaleOrDefault = function(locale) {
   if (!locale || !(locale instanceof v8Locale)) {
     return new v8Locale();
   } else {