Skipping

• Each token is assumed to have a prefix.
• By default, the prefix is /\s*/, that is, tokens are assumed to be separated by whitespaces. Just like in most computer languages.
• Global prefix is in $Parse::RecDescent::skip; this can be set before calling the start rule. But mind that this effects all parsers!
• For individual productions, the current skip prefix can be changed using the skip directive.
• Syntax: <skip: token>, where token is a string or a regular expression. This change will be in effect till the end of the production, or when encountering another skip directive.
• The return value of a skip directive is the previous value of the skip prefix. This makes it easy to restore a prefix:

          rule: <skip: ""> subrule <skip: $item [1]> anotherrule
          

• In actions, the current value of the skip prefix is available in the variable $skip