Variable getSourceConst

Get the full string that is being parsed. You could use this to define getChompedString or mapChompedString if you wanted:

const getChompedString = (parser: P.Parser<any>) => {
  return P.succeed(
    (from: number) => (to: number) => (str: string) => str.slice(from, to)
  )
    .apply(P.getOffset)
    .skip(parser)
    .apply(P.getOffset)
    .apply(P.getSource);
};