INDENT and DEDENT

[s5bug]

Is there a way to match INDENT/DEDENT or make parsers take an indentation level?

func foo(a: A, b: B): C =
  theresSomeIndentRequiredHere(a, b)

func noMoreIndentMeansNoMoreFoo: D = ???

[ollef]

Hey!

Good question.

There's no support built into the Earley library for indentation sensitivity, but perhaps a custom lexer could output such tokens for Earley to consume?

[s5bug]

Any recommendations on how to do that effectively and efficiently?

[ollef]

I'm afraid I can't help you there, but perhaps someone else can?

[s5bug]

I've opened a StackOverflow question. If I get a reasonable answer, I'll post it here and close the issue.

[s5bug]

I've been playing around with Megaparsec and Alex, both seem equally suited to handle this situation.