From 88f495dd68a20c1e16043e57e072324c628a8dc9 Mon Sep 17 00:00:00 2001
From: Cosimo Lupo <cosimo@anthrotype.com>
Date: Thu, 15 Mar 2018 13:07:53 +0000
Subject: [PATCH] feaLib.parser: use set for predefined ssXX and cvXX tags

it turns out regex would be slower in this case

See comments:
https://github.com/fonttools/fonttools/commit/7cefeadb3a6cae1635928ab2d8bac1467cd069cf#r28011318
---
 Lib/fontTools/feaLib/parser.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Lib/fontTools/feaLib/parser.py b/Lib/fontTools/feaLib/parser.py
index 3781a9ffb..2b2f2d478 100644
--- a/Lib/fontTools/feaLib/parser.py
+++ b/Lib/fontTools/feaLib/parser.py
@@ -16,8 +16,8 @@ log = logging.getLogger(__name__)
 class Parser(object):
     extensions = {}
     ast = ast
-    SS_FEATURE_TAGS = ["ss%02d" % i for i in range(1, 20+1)]
-    CV_FEATURE_TAGS = ["cv%02d" % i for i in range(1, 99+1)]
+    SS_FEATURE_TAGS = {"ss%02d" % i for i in range(1, 20+1)}
+    CV_FEATURE_TAGS = {"cv%02d" % i for i in range(1, 99+1)}
 
     def __init__(self, featurefile, glyphNames=(), followIncludes=True,
                  **kwargs):