feat: add reflectx

reflectx/tags.go

@@ -0,0 +1,13 @@
+package reflectx
+
+import "strings"
+
+// TagOptions ...
+type TagOptions string
+
+// ParseTag splits a struct field's json tag into its name and
+// comma-separated options.
+func ParseTag(tag string) (string, TagOptions) {
+	tag, opt, _ := strings.Cut(tag, ",")
+	return tag, TagOptions(opt)
+}

reflectx/tags_test.go

@@ -0,0 +1,40 @@
+package reflectx_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/zeiss/pkg/reflectx"
+)
+
+func TestParseTag(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		tag             string
+		expected        string
+		expectedOptions reflectx.TagOptions
+	}{
+		{
+			tag:             "name,omitempty",
+			expected:        "name",
+			expectedOptions: "omitempty",
+		},
+		{
+			tag:             "name,omitempty,required",
+			expected:        "name",
+			expectedOptions: "omitempty,required",
+		},
+		{
+			tag:             "name,omitempty,required,truncate",
+			expected:        "name",
+			expectedOptions: "omitempty,required,truncate",
+		},
+	}
+
+	for _, test := range tests {
+		tag, opt := reflectx.ParseTag(test.tag)
+		assert.Equal(t, test.expected, tag)
+		assert.Equal(t, test.expectedOptions, opt)
+	}
+}