fix: support string tag opt

fixes #36

Author: mweibel

sheriff.go

@@ -106,6 +106,18 @@ func Marshal(options *Options, data interface{}) (interface{}, error) {
 			continue
 		}
 
+		quoted := false
+		if jsonOpts.Contains("string") {
+			switch val.Kind() {
+			case reflect.Bool,
+				reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+				reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
+				reflect.Float32, reflect.Float64,
+				reflect.String:
+				quoted = true
+			}
+		}
+
 		// if there is an anonymous field which is a struct
 		// we want the childs exposed at the toplevel to be
 		// consistent with the embedded json marshaller
@@ -179,6 +191,9 @@ func Marshal(options *Options, data interface{}) (interface{}, error) {
 		if err != nil {
 			return nil, err
 		}
+		if quoted {
+			v = fmt.Sprintf("%v", v)
+		}
 
 		// when a composition field we want to bring the child
 		// nodes to the top

sheriff_test.go

@@ -754,3 +754,26 @@ func TestMarshal_NilPointer(t *testing.T) {
 	assert.Nil(t, v)
 	assert.NoError(t, err)
 }
+
+func TestMarshal_User(t *testing.T) {
+	type JsonStringTag struct {
+		Test  int64   `json:"test,string"`
+		TestB bool    `json:"testb,string"`
+		TestF float64 `json:"testf,string"`
+		TestS string  `json:"tests,string"`
+	}
+	j := JsonStringTag{
+		Test:  12,
+		TestB: true,
+		TestF: 12.0,
+		TestS: "test",
+	}
+
+	v, err := Marshal(&Options{}, j)
+	assert.NoError(t, err)
+	assert.Equal(t, map[string]interface{}{"test": "12", "testb": "true", "testf": "12", "tests": "test"}, v)
+
+	d, err := json.Marshal(j)
+	assert.NoError(t, err)
+	assert.Equal(t, `{"test":"12","testb":"true","testf":"12","tests":"\"test\""}`, string(d))
+}

tags.go

@@ -13,10 +13,8 @@ type tagOptions string
 // parseTag splits a struct field's json tag into its name and
 // comma-separated options.
 func parseTag(tag string) (string, tagOptions) {
-	if idx := strings.Index(tag, ","); idx != -1 {
-		return tag[:idx], tagOptions(tag[idx+1:])
-	}
-	return tag, tagOptions("")
+	tag, opt, _ := strings.Cut(tag, ",")
+	return tag, tagOptions(opt)
 }
 
 // Contains reports whether a comma-separated list of options
@@ -28,15 +26,11 @@ func (o tagOptions) Contains(optionName string) bool {
 	}
 	s := string(o)
 	for s != "" {
-		var next string
-		i := strings.Index(s, ",")
-		if i >= 0 {
-			s, next = s[:i], s[i+1:]
-		}
-		if s == optionName {
+		var name string
+		name, s, _ = strings.Cut(s, ",")
+		if name == optionName {
 			return true
 		}
-		s = next
 	}
 	return false
 }