added archive, megamillions, and powerball site logic

nodes.go

@@ -0,0 +1,32 @@
+package extractor
+
+type Nodes []Node
+
+func (n Nodes) Select(selector string) Nodes {
+	var res Nodes
+
+	for _, node := range n {
+		res = append(res, node.Select(selector)...)
+	}
+
+	return res
+}
+
+func (d Nodes) First() Node {
+	return d[0]
+}
+
+func (d Nodes) ExtractText() ([]string, error) {
+	var res []string
+
+	for _, doc := range d {
+		text, err := doc.Text()
+		if err != nil {
+			return nil, err
+		}
+
+		res = append(res, text)
+	}
+
+	return res, nil
+}