Subject: Re: Revisiting split-sequence and patterns
From: Erik Naggum <>
Date: Wed, 28 Nov 2001 07:48:30 GMT
Newsgroups: comp.lang.lisp
Message-ID: <>

* Jeff Greif
| Sometimes the tokens might be enclosed like this `some token' or [other
| token] or {there exists this token}.

  The reason this is out of place is that these things naturally nest.

| It may also be useful to specify the start and end delimiters in matching
| pairs, so that "SELECT * FROM LISPERS WHERE NAME = 'Erik Naggum'" could
| be treated as a single token in some circumstances where both single and
| double-quote were allowed as multiple-escape delimiters, but starting
| with double-quote meant you have to end with double-quote, and other
| delimiting characters appearing inside the double quotes would not be
| escapes.

  I already covered that.  Please have another look:

    If there be more patterns of syntax design, another one would involve
    escaping a whole sequence of characters so they revert from (potentially)
    special to normal interpretation, using a single special character at
--> BOTH ENDS of the sequence, and escaping that character and the escaping
    character inside the sequence with the same character that does this for
    a single character.  All the escaping characters are discarded from the
    extracted token.  Call this the multiple-escape mechanism.

  The past is not more important than the future, despite what your culture
  has taught you.  Your future observations, conclusions, and beliefs are
  more important to you than those in your past ever will be.  The world is
  changing so fast the balance between the past and the future has shifted.