Ranges: add unit test and fix corner case in split view

1 files changed, 27 insertions, 0 deletions

diff --git a/src/ranges.cc b/src/ranges.cc
new file mode 100644
index 00000000..d1603c18
--- /dev/null
+++ b/src/ranges.cc
@@ -0,0 +1,27 @@
+#include "ranges.hh"
+#include "unit_tests.hh"
+#include "string.hh"
+#include "string_utils.hh"
+
+namespace Kakoune
+{
+
+UnitTest test_ranges{[] {
+    auto check_equal = [](auto&& container, ConstArrayView<StringView> expected) {
+        kak_assert(std::equal(container.begin(), container.end(), expected.begin(), expected.end()));
+    };
+    check_equal("a,b,c"_sv | split<StringView>(','), {"a", "b", "c"});
+    check_equal(",b,c"_sv  | split<StringView>(','), {"", "b", "c"});
+    check_equal(",b,"_sv   | split<StringView>(','), {"", "b", ""});
+    check_equal(","_sv     | split<StringView>(','), {"", ""});
+    check_equal(""_sv      | split<StringView>(','), {});
+
+    check_equal(R"(a\,,\,b,\,)"_sv | split<StringView>(',', '\\')
+                                   | transform(unescape<',', '\\'>), {"a,", ",b", ","});
+    check_equal(R"(\,\,)"_sv | split<StringView>(',', '\\')
+                             | transform(unescape<',', '\\'>), {",,"});
+    check_equal(R"(\\,\\,)"_sv | split<StringView>(',', '\\')
+                               | transform(unescape<',', '\\'>), {R"(\)", R"(\)", ""});
+}};
+
+}