add SiblingsFiltered() and tests

doc.go

@@ -145,7 +145,7 @@ package goquery
 // - PrevAll() - Tree traversal
 // - PrevUntil() - Tree traversal
 // x PushStack()
-// - Siblings() - Tree traversal
+// x Siblings() - Tree traversal
 // x Slice()
 // x Text() - DOM Manipulation
 // x ToArray()

traversal.go

@@ -63,6 +63,7 @@ func (this *Selection) ContentsFiltered(selector string) *Selection {
 // Children() gets the child elements of each element in the Selection.
 // It returns a new Selection object containing these elements.
 func (this *Selection) Children() *Selection {
+	// TODO : Refactor using siblings?
 	return pushStack(this, getSelectionChildren(this, true))
 }
 
@@ -184,6 +185,19 @@ func (this *Selection) Siblings() *Selection {
 	return pushStack(this, getSiblingNodes(this.Nodes))
 }
 
+// SiblingsFiltered() gets the siblings of each element in the Selection
+// filtered by a selector. It returns a new Selection object containing the
+// matched elements.
+func (this *Selection) SiblingsFiltered(selector string) *Selection {
+	// Get the Siblings() unfiltered
+	n := getSiblingNodes(this.Nodes)
+	// Create a temporary Selection to filter using winnow
+	sel := &Selection{n, this.document, nil}
+	// Filter based on selector
+	n = winnow(sel, selector, true)
+	return pushStack(this, n)
+}
+
 // Internal implementation to get all parent nodes, stopping at the specified 
 // node (or nil if no stop).
 func getParentsNodes(nodes []*html.Node, stopSelector string, stopNodes []*html.Node) []*html.Node {

traversal_test.go

@@ -122,3 +122,13 @@ func TestSiblings2(t *testing.T) {
 	sel := Doc().Root.Find(".pvk-gutter").Siblings()
 	AssertLength(t, sel.Nodes, 9)
 }
+
+func TestSiblings3(t *testing.T) {
+	sel := Doc().Root.Find("body>.container-fluid").Siblings()
+	AssertLength(t, sel.Nodes, 0)
+}
+
+func TestSiblingsFiltered(t *testing.T) {
+	sel := Doc().Root.Find(".pvk-gutter").SiblingsFiltered(".pvk-content")
+	AssertLength(t, sel.Nodes, 3)
+}