From b823a49b6a57bc1736b33a0816b42aaaf86cf839 Mon Sep 17 00:00:00 2001
From: Sam Atman
Date: Fri, 6 Feb 2026 13:07:03 -0500
Subject: zg module, casing improvements

---
 src/CaseFolding.zig | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

(limited to 'src/CaseFolding.zig')

diff --git a/src/CaseFolding.zig b/src/CaseFolding.zig
index d69cddc..b7aa020 100644
--- a/src/CaseFolding.zig
+++ b/src/CaseFolding.zig
@@ -103,7 +103,16 @@ pub fn compatCaselessMatch(
     a: []const u8,
     b: []const u8,
 ) Allocator.Error!bool {
-    if (ascii.isAsciiOnly(a) and ascii.isAsciiOnly(b)) return std.ascii.eqlIgnoreCase(a, b);
+    var a_in = a;
+    var b_in = b;
+
+    // Ascii short path.  Only applies if they're the same length:
+    if (a_in.len == b_in.len) {
+        const prefix = ascii.caselessCmpLen(a_in, b_in);
+        if (prefix == a_in.len) return true;
+        a_in = a_in[prefix..];
+        b_in = b_in[prefix..];
+    }
 
     // Process a
     const nfd_a = try Normalize.nfxdCodePoints(allocator, a, .nfd);
@@ -192,10 +201,19 @@ pub fn canonCaselessMatch(
     a: []const u8,
     b: []const u8,
 ) Allocator.Error!bool {
-    if (ascii.isAsciiOnly(a) and ascii.isAsciiOnly(b)) return std.ascii.eqlIgnoreCase(a, b);
+    var a_in = a;
+    var b_in = b;
+
+    // Ascii short path.  Only applies if they're the same length:
+    if (a_in.len == b_in.len) {
+        const prefix = ascii.caselessCmpLen(a_in, b_in);
+        if (prefix == a_in.len) return true;
+        a_in = a_in[prefix..];
+        b_in = b_in[prefix..];
+    }
 
     // Process a
-    const nfd_a = try Normalize.nfxdCodePoints(allocator, a, .nfd);
+    const nfd_a = try Normalize.nfxdCodePoints(allocator, a_in, .nfd);
     defer allocator.free(nfd_a);
 
     var need_free_cf_nfd_a = false;
@@ -215,7 +233,7 @@ pub fn canonCaselessMatch(
     defer if (need_free_nfd_cf_nfd_a) allocator.free(nfd_cf_nfd_a);
 
     // Process b
-    const nfd_b = try Normalize.nfxdCodePoints(allocator, b, .nfd);
+    const nfd_b = try Normalize.nfxdCodePoints(allocator, b_in, .nfd);
     defer allocator.free(nfd_b);
 
     var need_free_cf_nfd_b = false;
-- 
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