Fix tagged_text escaping & add parse error tests

libs/ui/source/tagged_text.cpp

@@ -56,20 +56,19 @@ namespace psemek::ui
 			}
 			else
 			{
+				auto start = current;
+
 				if (*current == '\\')
 				{
 					++current;
 					if (current == text.end())
 						error("unexpected end");
-
-					if (*current != '[' && *current != ']' && *current != '\\')
-						error("unknown escape sequence \\" + std::string(1, *current));
 				}
 
 				auto append = [&](std::string_view & target)
 				{
 					if (target.empty())
-						target = {current, current + 1};
+						target = {start, current + 1};
 					else
 						target = {target.data(), current + 1};
 				};

libs/ui/tests/tagged_text.cpp

@@ -35,6 +35,11 @@ static void test(std::string_view text, tagged_text const & expected)
 	compare(tagged_text::parse(text), expected);
 }
 
+static void test_throw(std::string_view text)
+{
+	expect_throw(tagged_text::parse(text), tagged_text::parse_error);
+}
+
 test_case(ui_tagged__text_empty)
 {
 	test("", {});
@@ -88,9 +93,20 @@ test_case(ui_tagged__text_tag__attribute)
 
 test_case(ui_tagged__text_escape)
 {
-	test("\\[", {{"["}});
+	test("\\[", {{"\\["}});
-	test("\\]", {{"]"}});
+	test("\\]", {{"\\]"}});
-	test("\\\\", {{"\\"}});
+	test("\\\\", {{"\\\\"}});
+	test("\\[\\]", {{"\\[\\]"}});
+}
+
+test_case(ui_tagged__text_error)
+{
+	test_throw("[[");
+	test_throw("[ab[cd");
+	test_throw("]");
+	test_throw("][");
+	test_throw("[]]");
+	test_throw("[::]");
 }
 
 test_case(ui_tagged__text_random)