add support for unicode 13.0.0

Go 1.16 supports Unicode 13. Update testdata accordingly.
Add test generation script, set max version in build
constraint, and update CI.

.github/workflows/test.yml

@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.14.x, 1.15.x]
+        go-version: [1.14.x, 1.15.x, 1.16.x]
         os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:

.gitignore

@@ -9,4 +9,5 @@
 !go.mod
 !go.sum
 !*.md
-!*.go
+!*.go
+!*.py

go.mod

@@ -1,5 +1,5 @@
 module github.com/smasher164/xid
 
-go 1.15
+go 1.14
 
 require golang.org/x/text v0.3.3

testdata/gendata.py

@@ -0,0 +1,20 @@
+# 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.
+
+import unicodedata
+import regex
+import sys
+import gzip
+
+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)))
+        if matched:
+            f.write(b'T')
+        else:
+            f.write(b'F')
+
+gendata('xid_start')
+gendata('xid_continue')

unicodeTestVersion_114.go

@@ -1,4 +1,4 @@
-// +build go1.14
+// +build go1.14,!go1.16
 
 package xid
 

unicodeTestVersion_116.go

@@ -0,0 +1,5 @@
+// +build go1.16
+
+package xid
+
+const unicodeTestVersion = "13.0.0"