Fix Glob#to_regexp crash on brace patterns

test/test_glob.rb

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: Copyright (c) 2014-2026 Yegor Bugayenko
+# SPDX-License-Identifier: MIT
+
+require_relative '../utils/glob'
+require_relative 'test__helper'
+
+# PDD::Glob test.
+# Author:: Yegor Bugayenko (yegor256@gmail.com)
+# Copyright:: Copyright (c) 2014-2026 Yegor Bugayenko
+# License:: MIT
+class TestGlob < Minitest::Test
+  def test_converts_plain_pattern
+    assert_equal('foo/.*\\.rb', PDD::Glob.new('foo/*.rb').to_regexp)
+  end
+
+  def test_expands_braces
+    assert_equal('.*\\.(rb|js)', PDD::Glob.new('**/*.{rb,js}').to_regexp)
+  end
+
+  def test_keeps_unmatched_closing_brace
+    assert_equal('a}b', PDD::Glob.new('a}b').to_regexp)
+  end
+
+  def test_keeps_escaped_char_literal
+    assert_equal('a\\*b', PDD::Glob.new('a\\*b').to_regexp)
+  end
+end

utils/glob.rb

@@ -13,11 +13,12 @@ def initialize(string)
     # rubocop:disable Metrics/CyclomaticComplexity
     def to_regexp
       chars = @string.gsub(%r{(\*\*/\*)|(\*\*)}, '*').chars
-      curlies = 0, escaping = false
+      curlies = 0
+      escaping = false
       chars.map do |char|
         if escaping
           escaping = false
-          return char
+          next char
         end
         case char
         when '*'
@@ -32,9 +33,9 @@ def to_regexp
         when '}'
           if curlies.positive?
             curlies -= 1
-            return ')'
+            next ')'
           end
-          return char
+          next char
         when ','
           curlies.positive? ? '|' : char
         when '\\'