add support for unicode 15.0.0

.gitignore

@@ -10,4 +10,6 @@
 !go.sum
 !*.md
 !*.go
-!*.py
+!*.py
+!*.lock
+!*.nix

flake.nix

@@ -0,0 +1,22 @@
+{
+  description = "A flake that sets up the devShell";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    let supportedSystems = [ "aarch64-linux" "i686-linux" "x86_64-linux" ];
+    in flake-utils.lib.eachSystem supportedSystems (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ ];
+        };
+        pp = ps: with ps; [ regex ];
+      in {
+        devShell = pkgs.mkShell {
+          buildInputs = with pkgs; [ go (python312.withPackages pp) ];
+        };
+      });
+}

testdata/gendata.py

@@ -1,6 +1,7 @@
 # This script generates testdata for particular version of unicode.
 # Used Python 3.8.7 && regex==2020.2.20 to generate cases for unicode 12.1.0.
 # Used Python 3.9.1 && regex>2020.2.20 to generate cases for unicode 13.0.0.
+# Used Python 3.12.1 && regex==2023.8.8 to generate cases for unicode 15.0.0.
 
 import unicodedata
 import regex
@@ -10,7 +11,7 @@
 def gendata(category):
     f = gzip.open(f'{category}{unicodedata.unidata_version}.txt.gz', 'wb')
     for r in range(sys.maxunicode+1):
-        matched = bool(regex.match(f'\p{{{category}}}', chr(r)))
+        matched = bool(regex.match(f'\\p{{{category}}}', chr(r)))
         if matched:
             f.write(b'T')
         else:

unicodeTestVersion_114.go

@@ -1,3 +1,4 @@
+//go:build go1.14 && !go1.16
 // +build go1.14,!go1.16
 
 package xid

unicodeTestVersion_116.go

@@ -1,4 +1,5 @@
-// +build go1.16
+//go:build go1.16 && !go1.21
+// +build go1.16,!go1.21
 
 package xid
 

unicodeTestVersion_121.go

@@ -0,0 +1,6 @@
+//go:build go1.21
+// +build go1.21
+
+package xid
+
+const unicodeTestVersion = "15.0.0"