From a075aa2b072b21c76c082389c47a704382ab9003 Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@github.com>
Date: Fri, 5 Sep 2014 08:39:14 -0600
Subject: [PATCH] Perform synthetic bubbling through event target ancestors

---
 spec/command-registry-spec.coffee | 17 +++++++++++++++++
 src/command-registry.coffee       | 10 +++++++---
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/spec/command-registry-spec.coffee b/spec/command-registry-spec.coffee
index aec55e920..0addcde6a 100644
--- a/spec/command-registry-spec.coffee
+++ b/spec/command-registry-spec.coffee
@@ -28,3 +28,20 @@ describe "CommandRegistry", ->
 
     grandchild.dispatchEvent(new CustomEvent('command', bubbles: true))
     expect(called).toBe true
+
+  it "invokes callbacks with selectors matching ancestors of the target", ->
+    calls = []
+    registry.add 'command', '.child', (event) ->
+      expect(this).toBe child
+      expect(event.target).toBe grandchild
+      expect(event.currentTarget).toBe child
+      calls.push('child')
+
+    registry.add 'command', '.parent', (event) ->
+      expect(this).toBe parent
+      expect(event.target).toBe grandchild
+      expect(event.currentTarget).toBe parent
+      calls.push('parent')
+
+    grandchild.dispatchEvent(new CustomEvent('command', bubbles: true))
+    expect(calls).toEqual ['child', 'parent']
diff --git a/src/command-registry.coffee b/src/command-registry.coffee
index 3c17f2ea8..3042f7d8d 100644
--- a/src/command-registry.coffee
+++ b/src/command-registry.coffee
@@ -16,6 +16,10 @@ class CommandRegistry
       currentTarget: get: -> currentTarget
 
     currentTarget = event.target
-    for listener in @listenersByCommandName[event.type]
-      if event.target.webkitMatchesSelector(listener.selector)
-        listener.callback.call(currentTarget, syntheticEvent)
+    loop
+      for listener in @listenersByCommandName[event.type]
+        if currentTarget.webkitMatchesSelector(listener.selector)
+          listener.callback.call(currentTarget, syntheticEvent)
+
+      break if currentTarget is @rootNode
+      currentTarget = currentTarget.parentNode