From 4e5872998542fc704e9cad326081cae3c48209b0 Mon Sep 17 00:00:00 2001
From: Helmut Merz <helmutm@cy55.de>
Date: Sun, 10 Sep 2023 09:20:32 +0200
Subject: [PATCH] forge/rep: work in progress: Record type

---
 forge/rep/json.go   | 12 +++++++-----
 forge/rep/rep.go    | 14 ++++++++++++++
 tests/forge_test.go | 14 ++++++++++++++
 3 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/forge/rep/json.go b/forge/rep/json.go
index 2c7e018..20e6285 100644
--- a/forge/rep/json.go
+++ b/forge/rep/json.go
@@ -7,17 +7,17 @@ import (
 )
 
 func ParseJson(inp string) coderep {
-	var raw interface{}
-	return ParseJsonToTarget(inp, &raw)
+	return ParseJsonTo[interface{}](inp)
 }
 
-func ParseJsonToTarget(inp string, target *interface{}) coderep {
-	err := json.Unmarshal([]byte(inp), target)
+func ParseJsonTo[T any](inp string) coderep {
+	var data T
+	err := json.Unmarshal([]byte(inp), &data)
 	if err != nil {
 		log.Error(err).Msg("rep.ParseJson")
 		return nil
 	}
-	rep := prepare(*target)
+	rep := prepare(data)
 	return rep
 }
 
@@ -27,6 +27,8 @@ func prepare(raw interface{}) coderep {
 		return makeCode(ri)
 	case map[string]interface{}:
 		return makeModule(ri)
+	default:
+		return makeRecord(&ri)
 	}
 	return nil
 }
diff --git a/forge/rep/rep.go b/forge/rep/rep.go
index d25be33..0160091 100644
--- a/forge/rep/rep.go
+++ b/forge/rep/rep.go
@@ -88,3 +88,17 @@ func makeModule(ri map[string]interface{}) module {
 	}
 	return m
 }
+
+// record - some data structure, typically represented as struct
+
+type Record struct {
+	Data interface{}
+}
+
+func (r *Record) Compile(f forge.FE) forge.FPtr {
+	return nil
+}
+
+func makeRecord(ri interface{}) *Record {
+	return &Record{ri}
+}
diff --git a/tests/forge_test.go b/tests/forge_test.go
index e69a96c..b210b39 100644
--- a/tests/forge_test.go
+++ b/tests/forge_test.go
@@ -12,6 +12,15 @@ import (
 var fe = forge.NewFE()
 var b = builtins.Get(fe)
 
+type Person struct {
+	FirstName string `json:"firstname"`
+	LastName  string `json:"lastname"`
+}
+
+func (p Person) Compile(f forge.FE) forge.FPtr {
+	return f.Code(p)
+}
+
 func TestForge(tb *tbase.T) {
 	t := testing.SetUp(tb)
 	t.Run("exec", ExecTest)
@@ -56,4 +65,9 @@ func JsonTest(t *testing.T) {
 	c := src.Compile(fe)
 	fe.Call(c)
 	t.AssertEqual(fe.Pop(), 6)
+	j = `{"firstname": "John", "lastname": "Dow"}`
+	prep := rep.ParseJsonTo[Person](j)
+	data := prep.(*rep.Record).Data.(*interface{})
+	person := (*data).(Person)
+	t.AssertEqual(person.FirstName, "John")
 }