Explicitly handle (?x)

Author: Azoy

Sources/_StringProcessing/PrintAsPattern.swift

@@ -1339,6 +1339,13 @@ extension DSLTree.Atom {
 
       for option in options {
         switch option.kind {
+        case .extended:
+          // We don't currently support (?x) in the DSL, so if we see it, just
+          // do nothing.
+          if options.count == 1 {
+            return nil
+          }
+
         case .reluctantByDefault:
           if isAdd {
             printer.quantificationBehavior = .reluctant

Tests/RegexTests/RenderDSLTests.swift

@@ -225,12 +225,12 @@ extension RenderDSLTests {
       """#)
     try testConversion(#"[\u{301}]"#, #"""
       Regex {
-        One(.anyOf("\u{301}"))
+        One(CharacterClass.anyOf("\u{301}"))
       }
       """#)
     try testConversion(#"[abc\u{301}]"#, #"""
       Regex {
-        One(.anyOf("abc\u{301}"))
+        One(CharacterClass.anyOf("abc\u{301}"))
       }
       """#)