From: Ben Pfaff <blp@cs.stanford.edu>
Date: Tue, 23 Nov 2021 03:16:48 +0000 (-0800)
Subject: lexer: Allow for negative lookahead within a command.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=44c7a157afd05dace564c39e73a257c2758263b0;hp=44c7a157afd05dace564c39e73a257c2758263b0;p=pspp

lexer: Allow for negative lookahead within a command.

This allows to getting the location of prior tokens within a command,
which makes it easier to find the end of a group of tokens that was just
parsed by referring to the token at offset -1.
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