module support

builtins/readfile.go

@@ -0,0 +1,26 @@
+package builtins
+
+import (
+	"io/ioutil"
+	"monkey/object"
+	"monkey/typing"
+)
+
+// ReadFile ...
+func ReadFile(args ...object.Object) object.Object {
+	if err := typing.Check(
+		"readfile", args,
+		typing.ExactArgs(1),
+		typing.WithTypes(object.STRING_OBJ),
+	); err != nil {
+		return newError(err.Error())
+	}
+
+	filename := args[0].(*object.String).Value
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return newError("IOError: error reading from file %s: %s", filename, err)
+	}
+
+	return &object.String{Value: string(data)}
+}