From 719a177dba6d54b8fe15cdff29e3b35314700c3f Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Mon, 11 Aug 2014 16:51:52 -0700
Subject: [PATCH] decoding structs a bit

---
 decoder.go    | 25 +++++--------------------
 hcl/object.go | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 20 deletions(-)

diff --git a/decoder.go b/decoder.go
index 646fc4a..3c726ab 100644
--- a/decoder.go
+++ b/decoder.go
@@ -334,11 +334,10 @@ func (d *decoder) decodeStruct(name string, o *hcl.Object, result reflect.Value)
 		}
 	}
 
-	//usedKeys := make(map[string]struct{})
+	usedKeys := make(map[string]struct{})
 	decodedFields := make([]string, 0, len(fields))
 	decodedFieldsVal := make([]reflect.Value, 0)
 	unusedKeysVal := make([]reflect.Value, 0)
-	/*
 	for fieldType, field := range fields {
 		if !field.IsValid() {
 			// This should never happen
@@ -374,8 +373,8 @@ func (d *decoder) decodeStruct(name string, o *hcl.Object, result reflect.Value)
 		}
 
 		// Find the element matching this name
-		elems := obj.Get(fieldName, true)
-		if len(elems) == 0 {
+		obj := o.Get(fieldName, true)
+		if obj == nil {
 			continue
 		}
 
@@ -384,26 +383,12 @@ func (d *decoder) decodeStruct(name string, o *hcl.Object, result reflect.Value)
 
 		// Create the field name and decode
 		fieldName = fmt.Sprintf("%s.%s", name, fieldName)
-		for _, elem := range elems {
-			// If it is a sub-object, go through all the fields
-			if obj, ok := elem.(ast.ObjectNode); ok {
-				for _, elem := range obj.Elem {
-					if err := d.decode(fieldName, elem.Value, field); err != nil {
-						return err
-					}
-				}
-
-				continue
-			}
-
-			if err := d.decode(fieldName, elem, field); err != nil {
-				return err
-			}
+		if err := d.decode(fieldName, obj, field); err != nil {
+			return err
 		}
 
 		decodedFields = append(decodedFields, fieldType.Name)
 	}
-	*/
 
 	for _, v := range decodedFieldsVal {
 		v.Set(reflect.ValueOf(decodedFields))
diff --git a/hcl/object.go b/hcl/object.go
index 1ca9482..ff6e365 100644
--- a/hcl/object.go
+++ b/hcl/object.go
@@ -1,5 +1,9 @@
 package hcl
 
+import (
+	"strings"
+)
+
 // ValueType is an enum represnting the type of a value in
 // a LiteralNode.
 type ValueType byte
@@ -24,6 +28,38 @@ type Object struct {
 	Next  *Object
 }
 
+// Get gets all the objects that match the given key.
+//
+// It returns the resulting objects as a single Object structure with
+// the linked list populated.
+func (o *Object) Get(k string, insensitive bool) *Object {
+	if o.Type != ValueTypeObject {
+		return nil
+	}
+
+	var current, result *Object
+	m := o.Value.(map[string]*Object)
+	for _, o := range m {
+		if o.Key != k {
+			if !insensitive || !strings.EqualFold(o.Key, k) {
+				continue
+			}
+		}
+
+		o2 := *o
+		o2.Next = nil
+		if result == nil {
+			result = &o2
+			current = result
+		} else {
+			current.Next = &o2
+			current = current.Next
+		}
+	}
+
+	return result
+}
+
 // ObjectList is a list of objects.
 type ObjectList []*Object