Decode into pointers

ast/ast.go

@@ -69,11 +69,18 @@ func (n ObjectNode) Accept(v Visitor) {
 
 // Get returns all the elements of this object with the given key.
 // This is a case-sensitive search.
-func (n ObjectNode) Get(k string) []KeyedNode {
-	result := make([]KeyedNode, 0, 1)
+func (n ObjectNode) Get(k string) []Node {
+	result := make([]Node, 0, 1)
 	for _, elem := range n.Elem {
-		if elem.Key() == k {
-			result = append(result, elem)
+		if elem.Key() != k {
+			continue
+		}
+
+		switch n := elem.(type) {
+		case AssignmentNode:
+			result = append(result, n.Value)
+		default:
+			panic("unknown type")
 		}
 	}
 

ast/ast_test.go

@@ -70,3 +70,25 @@ func TestObjectNode_accept(t *testing.T) {
 		t.Fatalf("bad: %#v", v.Nodes)
 	}
 }
+
+func TestObjectNodeGet(t *testing.T) {
+	n := ObjectNode{
+		K: "foo",
+		Elem: []KeyedNode{
+			AssignmentNode{K: "foo", Value: LiteralNode{Value: "foo"}},
+			AssignmentNode{K: "bar", Value: LiteralNode{Value: "bar"}},
+			AssignmentNode{K: "foo", Value: LiteralNode{Value: "baz"}},
+		},
+	}
+
+	expected := []Node{
+		LiteralNode{Value: "foo"},
+		LiteralNode{Value: "baz"},
+	}
+
+	actual := n.Get("foo")
+
+	if !reflect.DeepEqual(actual, expected) {
+		t.Fatalf("bad: %#v", actual)
+	}
+}

decoder.go

@@ -58,6 +58,8 @@ func (d *decoder) decode(name string, n ast.Node, result reflect.Value) error {
 		return d.decodeInterface(name, n, result)
 	case reflect.Map:
 		return d.decodeMap(name, n, result)
+	case reflect.Ptr:
+		return d.decodePtr(name, n, result)
 	case reflect.Slice:
 		return d.decodeSlice(name, n, result)
 	case reflect.String:
@@ -238,6 +240,20 @@ func (d *decoder) decodeMap(name string, raw ast.Node, result reflect.Value) err
 	return nil
 }
 
+func (d *decoder) decodePtr(name string, raw ast.Node, result reflect.Value) error {
+	// Create an element of the concrete (non pointer) type and decode
+	// into that. Then set the value of the pointer to this type.
+	resultType := result.Type()
+	resultElemType := resultType.Elem()
+	val := reflect.New(resultElemType)
+	if err := d.decode(name, raw, reflect.Indirect(val)); err != nil {
+		return err
+	}
+
+	result.Set(val)
+	return nil
+}
+
 func (d *decoder) decodeSlice(name string, raw ast.Node, result reflect.Value) error {
 	n, ok := raw.(ast.ListNode)
 	if !ok {

decoder_test.go

@@ -160,3 +160,26 @@ func TestDecode_structure(t *testing.T) {
 		t.Fatalf("Actual: %#v\n\nExpected: %#v", actual, expected)
 	}
 }
+
+func TestDecode_structurePtr(t *testing.T) {
+	type V struct {
+		Key int
+		Foo string
+	}
+
+	var actual *V
+
+	err := Decode(&actual, testReadFile(t, "flat.hcl"))
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	expected := &V{
+		Key: 7,
+		Foo: "bar",
+	}
+
+	if !reflect.DeepEqual(actual, expected) {
+		t.Fatalf("Actual: %#v\n\nExpected: %#v", actual, expected)
+	}
+}