Improve attribute parsing (xoofx#82)

Adding support for parsing attributes defined as a macro,
and parsing function attributes that are on a separate line
before the function declaration.

Co-authored-by: Balazs Somogyi <[email protected]>
Co-authored-by: Alexandre Mutel <[email protected]>

Author: 3 people

src/CppAst.Tests/AttributesTest/TestTokenAttributes.cs

@@ -154,27 +154,29 @@ struct [[deprecated(""old"")]] TestMessage{
         [Test]
         public void TestCpp11StructAttributesWithMacro()
         {
-          ParseAssert(@"
+            ParseAssert(@"
 #define CLASS_ATTRIBUTE [[complex_attribute::attribute_name(""attribute_argument"")]]
-struct CLASS_ATTRIBUTE  Test{
+struct
+CLASS_ATTRIBUTE
+Test{
     int a;
     int b;
 };", compilation =>
-          {
-            Assert.False(compilation.HasErrors);
+                {
+                    Assert.False(compilation.HasErrors);
 
-            Assert.AreEqual(1, compilation.Classes.Count);
-            Assert.AreEqual(1, compilation.Classes[0].TokenAttributes.Count);
-            {
-              var attr = compilation.Classes[0].TokenAttributes[0];
-              Assert.AreEqual("complex_attribute", attr.Scope);
-              Assert.AreEqual("attribute_name", attr.Name);
-              Assert.AreEqual("\"attribute_argument\"", attr.Arguments);
-            }
-          },
-          // we are using a C++14 attribute because it can be used everywhere
-          new CppParserOptions() { AdditionalArguments = { "-std=c++14" }, ParseTokenAttributes = true }
-        );
+                    Assert.AreEqual(1, compilation.Classes.Count);
+                    Assert.AreEqual(1, compilation.Classes[0].TokenAttributes.Count);
+                    {
+                        var attr = compilation.Classes[0].TokenAttributes[0];
+                        Assert.AreEqual("complex_attribute", attr.Scope);
+                        Assert.AreEqual("attribute_name", attr.Name);
+                        Assert.AreEqual("\"attribute_argument\"", attr.Arguments);
+                    }
+                },
+                // we are using a C++14 attribute because it can be used everywhere
+                new CppParserOptions() { AdditionalArguments = { "-std=c++14" }, ParseTokenAttributes = true }
+            );
         }
 
         [Test]