1 files changed, 51 insertions, 0 deletions
diff --git a/devtools/client/sourceeditor/tern/signal.js b/devtools/client/sourceeditor/tern/signal.js
new file mode 100755
index 000000000..5ea64a438
--- /dev/null
+++ b/devtools/client/sourceeditor/tern/signal.js
@@ -0,0 +1,51 @@
+(function(root, mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+    return mod(exports);
+  if (typeof define == "function" && define.amd) // AMD
+    return define(["exports"], mod);
+  mod((root.tern || (root.tern = {})).signal = {}); // Plain browser env
+})(this, function(exports) {
+
+  function on(type, f) {
+    var handlers = this._handlers || (this._handlers = Object.create(null));
+    (handlers[type] || (handlers[type] = [])).push(f);
+  }
+
+  function off(type, f) {
+    var arr = this._handlers && this._handlers[type];
+    if (arr) for (var i = 0; i < arr.length; ++i)
+      if (arr[i] == f) { arr.splice(i, 1); break; }
+  }
+
+  var noHandlers = []
+  function getHandlers(emitter, type) {
+    var arr = emitter._handlers && emitter._handlers[type];
+    return arr && arr.length ? arr.slice() : noHandlers
+  }
+
+  function signal(type, a1, a2, a3, a4) {
+    var arr = getHandlers(this, type)
+    for (var i = 0; i < arr.length; ++i) arr[i].call(this, a1, a2, a3, a4)
+  }
+
+  function signalReturnFirst(type, a1, a2, a3, a4) {
+    var arr = getHandlers(this, type)
+    for (var i = 0; i < arr.length; ++i) {
+      var result = arr[i].call(this, a1, a2, a3, a4)
+      if (result) return result
+    }
+  }
+
+  function hasHandler(type) {
+    var arr = this._handlers && this._handlers[type]
+    return arr && arr.length > 0 && arr
+  }
+
+  exports.mixin = function(obj) {
+    obj.on = on; obj.off = off;
+    obj.signal = signal;
+    obj.signalReturnFirst = signalReturnFirst;
+    obj.hasHandler = hasHandler;
+    return obj;
+  };
+});