diff options
Diffstat (limited to 'src/__OLD_parcom/recover.cr')
| -rw-r--r-- | src/__OLD_parcom/recover.cr | 27 |
1 files changed, 0 insertions, 27 deletions
diff --git a/src/__OLD_parcom/recover.cr b/src/__OLD_parcom/recover.cr deleted file mode 100644 index 378f8d6..0000000 --- a/src/__OLD_parcom/recover.cr +++ /dev/null @@ -1,27 +0,0 @@ -require "./parser.cr" -require "./optional.cr" -require "./map.cr" - -module Parcom - # `Recover` 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, a `Recover` will not modify the input - # stream, and return an arbitrary value of type `V` instead. - class Recover(T, V) < Parser(T, V) - @p : Map(T, V?, V) - - # Accepts the parser to use, and the default value - # to return if the parser fails. - def initialize(p : Parser(T, V), default : V) - @p = Optional.new(p).map { |x| x.nil? ? default : x } - end - - # Tries to parse with the given parser, succeeds with the - # default value instead of failing. This parser does not - # consume input if the wrapped parser fails. - def parse(tokens : Tokens(T)) : Result(T, V) - @p.parse(tokens) - end - end -end - |
