basic for loop + examples -> era3

core/nodes.go

@@ -34,6 +34,7 @@ const (
 	BlockNodeType
 	ConditionalNodeType
 	LoopNodeType
+	ForNodeType
 	AssignNodeType
 	InvokeNodeType
 	CallNodeType
@@ -501,7 +502,7 @@ func (n ConditionalNode) Bounds() (Pos, Pos) {
 	return n.start, n.end
 }
 
-// LoopNode Loops (for/while)
+// LoopNode While loops
 type LoopNode struct {
 	condition Node
 	do        Node
@@ -522,6 +523,28 @@ func (n LoopNode) Bounds() (Pos, Pos) {
 	return n.start, n.end
 }
 
+// ForNode For loops
+type ForNode struct {
+	counter  Node
+	iterator Node
+	logic    Node
+
+	start Pos
+	end   Pos
+}
+
+func (n ForNode) Type() NodeType {
+	return ForNodeType
+}
+
+func (n ForNode) String() string {
+	return fmt.Sprintf("for %s in %s; %s", n.counter, n.iterator, n.logic)
+}
+
+func (n ForNode) Bounds() (Pos, Pos) {
+	return n.start, n.end
+}
+
 // AssignNode assignment
 type AssignNode struct {
 	dest    Node