=========================
Alternative patterns
=========================

val x = y match {
  case 1 | a => b
  case "c" | "d" | "e" => f
}

---

(compilation_unit
  (val_definition
    (identifier)
    (match_expression (identifier) (case_block
      (case_clause
        (alternative_pattern (number) (identifier))
        (identifier))
      (case_clause
        (alternative_pattern
          (alternative_pattern (string) (string))
          (string))
        (identifier))))))

=========================
Typed patterns
=========================

val x = y match {
  case 1 : Int => 2
  case a : B with C => d
  case _: B | _: C => 3
}

---

(compilation_unit
  (val_definition
    (identifier)
    (match_expression (identifier) (case_block
      (case_clause
        (typed_pattern (number) (type_identifier)) (number))
      (case_clause
        (typed_pattern (identifier) (compound_type (type_identifier) (type_identifier)))
        (identifier))
      (case_clause
        (alternative_pattern
          (typed_pattern (wildcard) (type_identifier))
          (typed_pattern (wildcard) (type_identifier)))
        (number))))))

============================
Tuple patterns
============================

val (a, b) = if (c) (d, e) else (f, g)

val x = y match {
  case (A, B) => X
}

---

(compilation_unit
  (val_definition
    (tuple_pattern (identifier) (identifier))
    (if_expression
      (parenthesized_expression (identifier))
      (tuple_expression (identifier) (identifier))
      (tuple_expression (identifier) (identifier))))
  (val_definition (identifier)
    (match_expression (identifier)
      (case_block
        (case_clause
          (tuple_pattern (identifier) (identifier)) (identifier))))))

============================
Case class patterns
============================

def showNotification(notification: Notification): String = {
  notification match {
    case Email(email, title, _) =>
      s"You got an email from $email with title: $title"
    case SMS(number, message) =>
      s"You got an SMS from $number! Message: $message"
    case VoiceRecording(name, link) =>
      s"you received a Voice Recording from $name! Click the link to hear it: $link"
  }
}

---

(compilation_unit
  (function_definition
    (identifier)
    (parameters (parameter (identifier) (type_identifier)))
    (type_identifier)
    (block
      (match_expression (identifier) (case_block
        (case_clause
          (case_class_pattern (type_identifier) (identifier) (identifier) (wildcard))
          (string_transform_expression (identifier) (string (interpolation (identifier)) (interpolation (identifier)))))
        (case_clause
          (case_class_pattern (type_identifier) (identifier) (identifier))
          (string_transform_expression (identifier) (string (interpolation (identifier)) (interpolation (identifier)))))
        (case_clause
          (case_class_pattern (type_identifier) (identifier) (identifier))
          (string_transform_expression (identifier) (string (interpolation (identifier)) (interpolation (identifier))))))))))

============================
Infix patterns
============================

def first(x: Seq[Int]) = x match {
  case e :+ _ => Some(e)
  case _ => None
}

---

(compilation_unit
  (function_definition (identifier)
    (parameters (parameter (identifier) (generic_type (type_identifier) (type_arguments (type_identifier)))))
    (match_expression (identifier)
      (case_block
        (case_clause (infix_pattern (identifier) (operator_identifier) (wildcard))
          (call_expression (identifier) (arguments (identifier))))
        (case_clause (wildcard)
          (identifier))))))

============================
Capture patterns
============================

val x = y match {
  case a @ B(1) => a
  case b @ C(d @ (e @ X, _: Y)) => e
}

---

(compilation_unit
  (val_definition
    (identifier)
    (match_expression
      (identifier)
      (case_block
        (case_clause
          (capture_pattern (identifier) (case_class_pattern (type_identifier) (number)))
          (identifier))
        (case_clause
          (capture_pattern (identifier)
            (case_class_pattern (type_identifier)
              (capture_pattern (identifier)
                (tuple_pattern
                  (capture_pattern (identifier) (identifier))
                  (typed_pattern (wildcard) (type_identifier))))))
          (identifier))))))