[Python-Dev] Parsing vs. lexing.
Barry A. Warsaw
Wed, 21 Aug 2002 15:59:42 -0400
>>>>> "GvR" == Guido van Rossum <firstname.lastname@example.org> writes:
GvR> Another note for Aahz: when it comes to scanning data that's
GvR> not really a programming language, e.g. email messages, the
GvR> words parsing, scanning, lexing and tokenizing are often used
GvR> pretty much interchangeably.
True, although even stuff like email messages are defined by a formal
grammar, i.e. RFC 2822. email.Generator of course doesn't strictly
use that grammar because it's trying to allow a much greater leniency
in its input than a language compiler would. But note that approaches
like Emacs's mail-extr.el package do in fact try to do more strict
parsing based on the grammar.