Create function to safely create new text construct

text.go

@@ -1,6 +1,23 @@
 package atomfeed
 
+import (
+	"fmt"
+)
+
 type Text interface {
 	Check() error
 	IsText() bool
 }
+
+func NewText(textType, content string) (Text, error) {
+	switch textType {
+	case "text", "html":
+		return &PlainText{Type: textType, Text: content}, nil
+	case "xhtml":
+		return &XHTMLText{Type: textType, XHTMLDiv: content}, nil
+	case "":
+		return &PlainText{Type: "text", Text: content}, nil
+	default:
+		return nil, fmt.Errorf("%v is not a valid text type", textType)
+	}
+}