restructure project

internal/builtins/ffi.go

@@ -0,0 +1,37 @@
+package builtins
+
+import (
+	"monkey/internal/object"
+	"monkey/internal/typing"
+)
+
+import (
+	"fmt"
+	"plugin"
+)
+
+// FFI ...
+func FFI(args ...object.Object) object.Object {
+	if err := typing.Check(
+		"ffi", args,
+		typing.ExactArgs(2),
+		typing.WithTypes(object.STRING_OBJ, object.STRING_OBJ),
+	); err != nil {
+		return newError(err.Error())
+	}
+
+	name := args[0].(*object.String).Value
+	symbol := args[1].(*object.String).Value
+
+	p, err := plugin.Open(fmt.Sprintf("%s.so", name))
+	if err != nil {
+		return newError("error loading plugin: %s", err)
+	}
+
+	v, err := p.Lookup(symbol)
+	if err != nil {
+		return newError("error finding symbol: %s", err)
+	}
+
+	return &object.Builtin{Name: symbol, Fn: v.(object.BuiltinFunction)}
+}