Escape literals in public constant string (#288)

src/PublicApiGenerator/ApiGenerator.cs

@@ -565,13 +565,7 @@ private static CodeExpression CreateInitialiserExpression(CustomAttributeArgumen
         }
 
         if (value is string s)
-        {
-            // CodeDOM outputs a verbatim string. Any string with \n is treated as such, so normalize
-            // it to make it easier for comparisons
-            s = Regex.Replace(s, @"\n", "\\n");
-            s = Regex.Replace(s, @"\r\n|\r\\n", "\\r\\n");
-            value = s;
-        }
+            value = NormalizeString(s);
 
         return new CodePrimitiveExpression(value);
     }
@@ -824,8 +818,22 @@ private static void AddFieldToTypeDeclaration(CodeTypeDeclaration typeDeclaratio
         };
 
         if (memberInfo.HasConstant)
-            field.InitExpression = new CodePrimitiveExpression(memberInfo.Constant);
+        {
+            var value = memberInfo.Constant;
+            if (value is string s)
+                value = NormalizeString(s);
+            field.InitExpression = new CodePrimitiveExpression(value);
+        }
 
         typeDeclaration.Members.Add(field);
     }
+
+    private static string NormalizeString(string s)
+    {
+        // CodeDOM outputs a verbatim string. Any string with \n is treated as such, so normalize
+        // it to make it easier for comparisons
+        s = Regex.Replace(s, @"\n", "\\n");
+        s = Regex.Replace(s, @"\r\n|\r\\n", "\\r\\n");
+        return s;
+    }
 }

src/PublicApiGeneratorTests/Constants.cs

@@ -0,0 +1,34 @@
+using PublicApiGeneratorTests.Examples;
+
+namespace PublicApiGeneratorTests
+{
+    public class Constants : ApiGeneratorTestsBase
+    {
+        // https://github.com/PublicApiGenerator/PublicApiGenerator/issues/82
+        [Fact]
+        public void Should_escape_literals_in_public_constant_string()
+        {
+            AssertPublicApi<MyConstants>(
+@"namespace PublicApiGeneratorTests.Examples
+{
+    public class MyConstants
+    {
+        public const string MULTILINE1 = ""This\\r\\nIs\\r\\nMultiline\\r\\n"";
+        public const string MULTILINE2 = ""This\\nIs\\nMultiline\\n"";
+        public const string SINGLELINE = ""ABC"";
+        public MyConstants() { }
+    }
+}");
+        }
+    }
+
+    namespace Examples
+    {
+        public class MyConstants
+        {
+            public const string SINGLELINE = "ABC";
+            public const string MULTILINE1 = "This\r\nIs\r\nMultiline\r\n";
+            public const string MULTILINE2 = "This\nIs\nMultiline\n";
+        }
+    }
+}