feat: added RawValue interface (zserge#127)

* feat: added RawValue interface

To allow for the detection of a `nil` return, a new interface is added (to maintain backwards compatibility) and implemented by `value`. This interface, `RawValue`, allows the retrieval of the raw bytes but requires a type assertion.

* fix: add bytes to Value

* fix: use bytes for test

value.go

@@ -13,6 +13,7 @@ type Value interface {
  Bool() bool
  Object() map[string]Value
  Array() []Value
+ Bytes() []byte
 }
 
 type value struct {
@@ -21,6 +22,7 @@ type value struct {
 }
 
 func (v value) Err() error { return v.err }
+func (v value) Bytes() []byte { return v.raw }
 func (v value) To(x interface{}) error { return json.Unmarshal(v.raw, x) }
 func (v value) Float() (f float32) { v.To(&f); return f }
 func (v value) Int() (i int) { v.To(&i); return i }

value_test.go

@@ -1,6 +1,7 @@
 package lorca
 
 import (
+ "bytes"
  "encoding/json"
  "errors"
  "testing"
@@ -50,3 +51,17 @@ func TestValueComplex(t *testing.T) {
  t.Fail()
  }
 }
+
+func TestRawValue(t *testing.T) {
+ var v Value
+
+ v = value{raw: json.RawMessage(nil)}
+ if v.Bytes() != nil {
+ t.Fail()
+ }
+
+ v = value{raw: json.RawMessage(`"hello"`)}
+ if !bytes.Equal(v.Bytes(), []byte(`"hello"`)) {
+ t.Fail()
+ }
+}