Add line-comment filter for streambuf.

IOStreams/LineComments.test/0.cc

@@ -0,0 +1,39 @@
+#include "../LineComments.h"
+
+#include <sstream>
+
+#include <Alepha/Testing/test.h>
+#include <Alepha/Testing/TableTest.h>
+
+#include <Alepha/Utility/evaluation_helpers.h>
+
+
+
+static auto
+stream( const std::string &text )
+{
+	std::istringstream iss{ text };
+
+	iss >> Alepha::IOStreams::DropComments{};
+
+	std::string s;
+	getline( iss, s, {} );
+
+	return s;
+}
+
+static auto init= Alepha::Utility::enroll <=[]
+{
+	using namespace Alepha::Testing::exports;
+
+	"Do we strip comments correctly"_test <=TableTest< stream >
+	::Cases
+	{
+		{ "Simple (no comment)", { "Hello World!" }, "Hello World!" },
+		{ "Simple (One comment)", { "Hello World!# Comment" }, "Hello World!" },
+		{ "Two lines (One comment at end)", { "Hello World!\nGoodbye World! # Comment" }, "Hello World!\nGoodbye World! " },
+		{ "Two lines (One comment after first)", { "Hello World! #Comment\nGoodbye World!" }, "Hello World! \nGoodbye World!" },
+		{ "Two lines (Two comments)", { "Hello World! #Comment\nGoodbye World! #Comment" }, "Hello World! \nGoodbye World! " },
+		{ "Two lines (Two comments, extra newline)", { "Hello World! #Comment\nGoodbye World! #Comment\n" }, "Hello World! \nGoodbye World! \n" },
+	};
+};