fix Find() so that is searches only descendents

doc.go

@@ -128,7 +128,7 @@ package goquery
 // x HasClass()
 // - Html() ? - Attributes
 // x Index()
-// - Is() - Filtering
+// x Is() - Filtering
 // x Last()
 // x Length() / Size()
 // x Map()
@@ -145,7 +145,7 @@ package goquery
 // x PushStack()
 // - Siblings() - Tree traversal
 // x Slice()
-// - Text() - DOM Manipulation
+// x Text() - DOM Manipulation
 // x ToArray()
 // x Unique() internally only
 // - Val() ? - Attributes

traversal.go

@@ -6,24 +6,36 @@ import (
 	"strings"
 )
 
-// Returns a new Selection object
+// TODO : Maybe make the Document's Root return a Selection, Find() on the
+// Document is not very useful (would need all the same funcs as Selection)
 func (this *Document) Find(selector string) *Selection {
 	return &Selection{findWithContext(selector, this.Root), this, nil}
 }
 
-// Returns a new Selection object
+// Find() gets the descendants of each element in the current set of matched
+// elements, filtered by a selector. It returns a new Selection object
+// containing these matched elements.
 func (this *Selection) Find(selector string) *Selection {
-	return &Selection{findWithContext(selector, this.Nodes...), this.document, nil}
+	return pushStack(this, findWithContext(selector, this.Nodes...))
 }
 
-// Private internal implementation of the various Find() methods
+func (this *Selection) FindSelection(sel *Selection) *Selection {
+	return nil
+}
+
+// Private internal implementation of the Find() methods
 func findWithContext(selector string, nodes ...*html.Node) []*html.Node {
 	var matches []*html.Node
 
 	sel := cascadia.MustCompile(selector)
 	// Match the selector on each node
 	for _, n := range nodes {
-		matches = append(matches, sel.MatchAll(n)...)
+		// Go down one level, becausejQuery's Find() selects only within descendants
+		for _, c := range n.Child {
+			if c.Type == html.ElementNode {
+				matches = appendWithoutDuplicates(matches, sel.MatchAll(c))
+			}
+		}
 	}
 	return matches
 }

traversal_test.go

@@ -11,6 +11,13 @@ func TestFind(t *testing.T) {
 	}
 }
 
+func TestFindNotSelf(t *testing.T) {
+	sel := Doc().Find("h1").Find("h1")
+	if len(sel.Nodes) > 0 {
+		t.Errorf("Expected no node, found %v.", len(sel.Nodes))
+	}
+}
+
 func TestFindInvalidSelector(t *testing.T) {
 	defer func() {
 		if e := recover(); e == nil {