initial commit lets start

facades/builder.go

@@ -0,0 +1,32 @@
+package facades
+
+import (
+	"fmt"
+	"plcopenxmlbuilder/builders"
+	"schema"
+)
+
+type GenerateType int
+
+const (
+	PLC GenerateType = iota
+	Application
+	Files
+)
+
+type Builder interface {
+	Marshal(s *schema.Project) ([]byte, error)
+}
+
+func NewBuilder(platform string, generateType GenerateType) (Builder, error) {
+	var builder Builder
+
+	switch platform {
+	case "twincat3":
+		builder = builders.NewTwincat3Builder()
+	default:
+		return nil, fmt.Errorf("no builder for %s found", platform)
+	}
+
+	return builder, nil
+}