simd/codepoint-width: wip

src/simd/codepoint_width.zig

@@ -0,0 +1,45 @@
+const std = @import("std");
+
+// vt.cpp
+extern "c" fn ghostty_simd_codepoint_width(u32) i8;
+
+pub fn codepointWidth(cp: u32) i8 {
+    //return @import("ziglyph").display_width.codePointWidth(@intCast(cp), .half);
+    return ghostty_simd_codepoint_width(cp);
+}
+
+test "codepointWidth basic" {
+    const testing = std.testing;
+    try testing.expectEqual(@as(i8, 1), codepointWidth('a'));
+    try testing.expectEqual(@as(i8, 1), codepointWidth(0x100)); // Ā
+    try testing.expectEqual(@as(i8, 2), codepointWidth(0x3400)); // 㐀
+    try testing.expectEqual(@as(i8, 2), codepointWidth(0x2E3A)); // ⸺
+    try testing.expectEqual(@as(i8, 2), codepointWidth(0x1F1E6)); // 🇦
+    try testing.expectEqual(@as(i8, 2), codepointWidth(0x4E00)); // 一
+    try testing.expectEqual(@as(i8, 2), codepointWidth(0xF900)); // 豈
+    try testing.expectEqual(@as(i8, 2), codepointWidth(0x20000)); // 𠀀
+    try testing.expectEqual(@as(i8, 2), codepointWidth(0x30000)); // 𠀀
+    // try testing.expectEqual(@as(i8, 1), @import("ziglyph").display_width.codePointWidth(0x100, .half));
+}
+
+pub export fn ghostty_ziglyph_codepoint_width(cp: u32) callconv(.C) i8 {
+    return @import("ziglyph").display_width.codePointWidth(@intCast(cp), .half);
+}
+
+test "codepointWidth matches ziglyph" {
+    const testing = std.testing;
+    const ziglyph = @import("ziglyph");
+
+    // try testing.expect(ziglyph.general_category.isNonspacingMark(0x16fe4));
+    // if (true) return;
+
+    const min = 0xFF + 1; // start outside ascii
+    for (min..std.math.maxInt(u21)) |cp| {
+        const simd = codepointWidth(@intCast(cp));
+        const zg = ziglyph.display_width.codePointWidth(@intCast(cp), .half);
+        if (simd != zg) {
+            std.log.warn("mismatch cp=U+{x} simd={} zg={}", .{ cp, simd, zg });
+            try testing.expect(false);
+        }
+    }
+}