Case Insensitive Literals

[dennis-barrett]

Hello, I'm really enjoying using Parsita, thanks for creating it 🙂

Is there an easy way to ignore case in literals. For example:

from parsita import *

class CaseInsensitiveParsers(TextParsers):
  # Would be nice to specify that this is case-insensitive:
  for_parser = lit('for')

  # This is the only way I can think of doing it right now (or with a regex):
  for_parser_ci = lit('for', 'For', 'FOr', 'FOR', 'fOr', 'fOR', 'foR', 'FoR')

CaseInsensitiveParsers.for_parser_ci.parse('FOR').or_die() # works
CaseInsensitiveParsers.for_parser.parse('FOR').or_die() # obv doesn't work, but it would be nice

[drhagen]

Yeah, you need to use reg for this:

from parsita import *

class CaseInsensitiveParsers(TextParsers):
  for_parser_reg = reg('(?i)for')

CaseInsensitiveParsers.for_parser_reg.parse('FOR').or_die() # also works

This seems pretty ergonomic to me, but if you have a lot of these you could make a helper function:

from parsita import *

def cilit(token: str) -> Parser[str, str]:
    return reg("(?i)" + token)

class CaseInsensitiveParsers(TextParsers):
  for_parser_cilit = cilit('for')

CaseInsensitiveParsers.for_parser_cilit.parse('FOR').or_die() # also works

[dennis-barrett]

Perfect, thanks for the quick response!