Added Safari Support

safari/common.js

Index: safari/common.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/safari/common.js
@@ -0,0 +1,186 @@
+(function() {
+  /* Events */
+
+  WrappedEventTarget = function(target, eventName, capture) {
+    this._listeners = [];
+    this._wrappedListeners = [];
+
+    this._target = target;
+    this._eventName = eventName;
+    this._capture = capture;
+  };
+  WrappedEventTarget.prototype = {
+    addListener: function(listener) {
+      var wrappedListener = this._wrapListener(listener);
+
+      this._listeners.push(listener);
+      this._wrappedListeners.push(wrappedListener);
+
+      this._target.addEventListener(
+        this._eventName,
+        wrappedListener,
+        this._capture
+      );
+    },
+    removeListener: function(listener) {
+      var idx = this._listeners.indexOf(listener);
+
+      if (idx != -1) {
+        this._target.removeEventListener(
+          this._eventName,
+          this._wrappedListeners[idx],
+          this._capture
+        );
+
+        this._listeners.splice(idx, 1);
+        this._wrappedListeners.splice(idx, 1);
+      }
+    }
+  };
+
+
+  MessageEventTarget = function(target) {
+    WrappedEventTarget.call(this, target, "message", false);
+  };
+  MessageEventTarget.prototype = {
+    __proto__: WrappedEventTarget.prototype,
+    _wrapListener: function(listener) {
+      return function(event) {
+        if (event.name.indexOf("request-") != 0)
+          return;
+
+        var sender = {};
+        var dispatcher;
+
+        if (event.target instanceof SafariBrowserTab) {
+          dispatcher = event.target.page;
+          sender.tab = new Tab(event.target);
+        } else {
+          dispatcher = event.target.tab;
+          sender.tab = null;
+        }
+
+        listener(event.message, sender, function(message) {
+          dispatcher.dispatchMessage("response-" + event.name.substr(8), message);
+        });
+      };
+    }
+  };
+
+
+  /* Message passing */
+
+  var requestCounter = 0;
+
+  sendMessage = function(message, responseCallback) {
+    var requestId = ++requestCounter;
+
+    if (responseCallback) {
+      var eventTarget = this._eventTarget;
+      var responseListener = function(event) {
+        if (event.name == "response-" + requestId) {
+          eventTarget.removeEventListener("message", responseListener, false);
+          responseCallback(event.message);
+        }
+      };
+      eventTarget.addEventListener("message", responseListener, false);
+    }
+
+    this._messageDispatcher.dispatchMessage("request-" + requestId, message);
+  };
+
+
+  /* I18n */
+
+  var I18n = function() {
+    this._localeCandidates = this._getLocaleCandidates();
+    this._uiLocale = this._localeCandidates[0];
+  };
+  I18n.prototype = {
+    _getLocaleCandidates: function() {
+      var bits, i, locale;
+      var candidates = [];
+      var default_locale = "en_US";
+
+      for (i = (bits = navigator.language.split("-")).length; i > 0; i--) {
+        locale = bits.slice(0, i).join("_");
+        candidates.push(locale);
+
+        if (locale == default_locale)
+          return candidates;
+      }
+
+      candidates.push(default_locale);
+      return candidates;
+    },
+    _getCatalog: function(locale) {
+      var xhr = new XMLHttpRequest();
+      
+      xhr.open("GET", safari.extension.baseURI + "_locales/" + locale + "/messages.json", false);
+
+      try {
+        xhr.send();
+      } catch (e) {
+        return null;
+      }
+
+      return JSON.parse(xhr.responseText);
+    },
+    getMessage: function(msgId, substitutions) {
+      if (msgId == "@@ui_locale")
+        return this._uiLocale;
+
+      for (var i = 0; i < this._localeCandidates.length; i++) {
+        var catalog = this._getCatalog(this._localeCandidates[i]);
+        if (!catalog) {
+          // if there is no catalog for this locale
+          // candidate, dont"t try to load it again
+          this._localeCandidates.splice(i--, 1);
+          continue;
+        }
+
+        var msg = catalog[msgId];
+        if (!msg)
+          continue;
+
+        var msgstr = msg.message;
+        if (!msgstr)
+          continue;
+
+        for (var placeholder in msg.placeholders) {
+          var placeholderDetails = msg.placeholders[placeholder];
+          if (!placeholderDetails || !placeholderDetails.content)
+            continue;
+          if (placeholderDetails.content.indexOf("$") != 0)
+            continue;
+
+          var placeholderIdx = parseInt(placeholderDetails.content.substr(1));
+          if (isNaN(placeholderIdx) || placeholderIdx < 1)
+            continue;
+
+          var placeholderValue;
+          if (Object.prototype.toString.call(substitutions) == "[object Array]")
+            placeholderValue = substitutions[placeholderIdx - 1];
+          else if (placeholderIdx == 1)
+            placeholderValue = substitutions;
+
+          msgstr = msgstr.replace("$" + placeholder + "$", placeholderValue || "");
+        }
+
+        return msgstr;
+      }
+
+      return "";
+    }
+  };
+
+
+  /* API */
+
+  ext = {
+    getURL: function(path) {
+      return safari.extension.baseURI + path;
+    },
+    i18n: new I18n()
+  };
+})();