1 files changed, 0 insertions, 40 deletions
diff --git a/src/__OLD_parcom/optional.cr b/src/__OLD_parcom/optional.cr
deleted file mode 100644
index b368d4e..0000000
--- a/src/__OLD_parcom/optional.cr
+++ /dev/null
@@ -1,40 +0,0 @@
-require "./parser.cr"
-
-module Parcom
-  # `Optional` is a `Parser` that tries to parse with another parser,
-  # but does not fail the parser chain if the wrapped parser fails.
-  # If the wrapped parser fails, an `Optional` will not modify the input
-  # stream, and return `nil` instead.
-  #
-  # Example:
-  # ```
-  # digit = Satisfy(Char).new { |c| c.digit? }
-  # digits = Many.new(digit)
-  # plus_sign = Optional.new(Token.new('+'))
-  # positive_int = plus_sign >> digits
-  #
-  # input1 = Tokens.from_string("+12345")
-  # input2 = Tokens.from_string("12345")
-  #
-  # # Both of these has the same result
-  # positive_int.parse(input1)
-  # positive_int.parse(input2)
-  # ```
-  class Optional(T, V) < Parser(T, V?)
-    # Accepts the parser to use.
-    def initialize(@p : Parser(T, V))
-    end
-
-    # Tries to parse with the given parser, succeeds with `nil`
-    # instead of failing. This parser does not consume input if
-    # the wrapped parser fails.
-    def parse(tokens : Tokens(T)) : Result(T, V?)
-      r = @p.parse?(tokens)
-
-      new_tokens = r.nil? ? tokens : r.tokens
-      new_value = r.nil? ? nil : r.value
-      Result.new(new_tokens, new_value)
-    end
-  end
-end
-