Not with a parsing expression grammar! They make it easy to say that operators must be separated by spaces only when the alternative would be a valid identifier

Not with a parsing expression grammar! They make it easy to say that operators must be separated by spaces only when the alternative would be a valid identifier, and if you disallow trailing hyphens this matches most cases: a-variable; a-1, a-(expr()), 1-a-variable (don't do this) I think the last one illustrates why this will never be popular.