feat(library): add experimental string LCASE overloads

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/pseudocode-lib/_exp_string.cc b/pseudocode-lib/_exp_string.cc
index d406274..6155319 100644
--- a/pseudocode-lib/_exp_string.cc
+++ b/pseudocode-lib/_exp_string.cc
@@ -1,4 +1,5 @@
 #include <algorithm>
+#include <cctype>
 #include <cstdio>
 #include <exception>
 #include <stdexcept>
@@ -88,6 +89,18 @@ void _exp_string_impl_mid(void *Target, void *Handle, long long Start, long long
         text(Target) = Source.substr(Position, Length);
     });
 }
+void _exp_string_impl_lcase(void *Target, void *Handle) {
+    checked([&] {
+        text(Target) = text(Handle);
+        for (char &Ch : text(Target))
+            Ch = static_cast<char>(std::tolower(static_cast<unsigned char>(Ch)));
+    });
+}
+char _exp_string_impl_lcase_char(char Ch) {
+    return checked([&] {
+        return static_cast<char>(std::tolower(static_cast<unsigned char>(Ch)));
+    });
+}
 void _exp_string_impl_output(void *Handle) {
     checked([&] {
         const auto &Text = text(Handle);