add plus operator

MeilCli · May 28, 2017 · cb8b962 · cb8b962
1 parent f7b201d
commit cb8b962
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diff --git a/Source/Plugin.CrossFormattedText.Abstractions/FormattedString.cs b/Source/Plugin.CrossFormattedText.Abstractions/FormattedString.cs
@@ -739,5 +739,17 @@ public static implicit operator FormattedString(string text) {
         public static explicit operator string(FormattedString text) {
             return text.Text;
         }
+
+        public static FormattedString operator+(FormattedString a,FormattedString b) {
+            return new FormattedString(a.spans.Concat(b.spans));
+        }
+
+        public static FormattedString operator+(FormattedString formattedString,Span span) {
+            return new FormattedString(formattedString.spans.Concat(Enumerable.Repeat(span,1)));
+        }
+
+        public static FormattedString operator+(Span span,FormattedString formattedString) {
+            return new FormattedString(Enumerable.Repeat(span,1).Concat(formattedString.spans));
+        }
     }
 }
diff --git a/Test/Test.CrossFormattedText.Unit/FormattedStringTest.cs b/Test/Test.CrossFormattedText.Unit/FormattedStringTest.cs
@@ -290,5 +290,18 @@ public void TrimSpanTest() {
             Assert.AreEqual(newText1.Text,text.Subspan(1,3).Text);
             Assert.AreEqual(newText1.AnySpanReferenceEquals(text),false);
         }
+
+        [TestMethod]
+        public void PlusOperatorTest() {
+            FormattedString value = "aaa";
+
+            Assert.AreEqual((value + "ccc").Text,"aaaccc");
+            Assert.AreEqual(("ccc" + value).Text,"cccaaa");
+
+            Span a = new Span() { Text = "bbb" };
+
+            Assert.AreEqual((value + a).Text,"aaabbb");
+            Assert.AreEqual((a + value).Text,"bbbaaa");
+        }
     }
 }