From b9c4780f07d31d7b92d331ffd46e0807de37c54f Mon Sep 17 00:00:00 2001
From: Martin Atkins <mart@degeneration.co.uk>
Date: Thu, 3 May 2018 11:53:06 -0700
Subject: [PATCH] addrs: Helper methods for converting module calls to absolute
 modules

---
 addrs/module_call.go | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/addrs/module_call.go b/addrs/module_call.go
index bbbd76685..09596cc84 100644
--- a/addrs/module_call.go
+++ b/addrs/module_call.go
@@ -43,6 +43,14 @@ func (c ModuleCallInstance) String() string {
 	return fmt.Sprintf("module.%s%s", c.Call.Name, c.Key)
 }
 
+// ModuleInstance returns the address of the module instance that corresponds
+// to the receiving call instance when resolved in the given calling module.
+// In other words, it returns the child module instance that the receving
+// call instance creates.
+func (c ModuleCallInstance) ModuleInstance(caller ModuleInstance) ModuleInstance {
+	return caller.Child(c.Call.Name, c.Key)
+}
+
 // Output returns the address of an output of the receiver identified by its
 // name.
 func (c ModuleCallInstance) Output(name string) ModuleCallOutput {
@@ -63,3 +71,11 @@ type ModuleCallOutput struct {
 func (co ModuleCallOutput) String() string {
 	return fmt.Sprintf("%s.%s", co.Call.String(), co.Name)
 }
+
+// AbsOutputValue returns the absolute output value address that corresponds
+// to the receving module call output address, once resolved in the given
+// calling module.
+func (co ModuleCallOutput) AbsOutputValue(caller ModuleInstance) AbsOutputValue {
+	moduleAddr := co.Call.ModuleInstance(caller)
+	return moduleAddr.OutputValue(co.Name)
+}