From cdc707fa38c39b7c4a97b37026a67759a65a83d4 Mon Sep 17 00:00:00 2001
From: Ian Gregory <justcheesy@outlook.com>
Date: Thu, 27 Oct 2022 01:28:08 -0400
Subject: [PATCH] Cache compiled regexes
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Improves performance of `brew info --json=v2 --eval-all` by about 15–20%
---
 Library/Homebrew/cask/cask_loader.rb | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/Library/Homebrew/cask/cask_loader.rb b/Library/Homebrew/cask/cask_loader.rb
index 8049077ee6..93ac87bb9b 100644
--- a/Library/Homebrew/cask/cask_loader.rb
+++ b/Library/Homebrew/cask/cask_loader.rb
@@ -19,12 +19,15 @@ module Cask
 
         content = ref.to_str
 
-        token  = /(?:"[^"]*"|'[^']*')/
-        curly  = /\(\s*#{token.source}\s*\)\s*\{.*\}/
-        do_end = /\s+#{token.source}\s+do(?:\s*;\s*|\s+).*end/
-        regex  = /\A\s*cask(?:#{curly.source}|#{do_end.source})\s*\Z/m
+        # Cache compiled regex
+        @regex ||= begin
+          token  = /(?:"[^"]*"|'[^']*')/
+          curly  = /\(\s*#{token.source}\s*\)\s*\{.*\}/
+          do_end = /\s+#{token.source}\s+do(?:\s*;\s*|\s+).*end/
+          /\A\s*cask(?:#{curly.source}|#{do_end.source})\s*\Z/m
+        end
 
-        content.match?(regex)
+        content.match?(@regex)
       end
 
       def initialize(content)
@@ -93,8 +96,13 @@ module Cask
       extend T::Sig
 
       def self.can_load?(ref)
-        uri_regex = ::URI::DEFAULT_PARSER.make_regexp
-        return false unless ref.to_s.match?(Regexp.new("\\A#{uri_regex.source}\\Z", uri_regex.options))
+        # Cache compiled regex
+        @uri_regex ||= begin
+          uri_regex = ::URI::DEFAULT_PARSER.make_regexp
+          Regexp.new("\\A#{uri_regex.source}\\Z", uri_regex.options)
+        end
+
+        return false unless ref.to_s.match?(@uri_regex)
 
         uri = URI(ref)
         return false unless uri