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文件: /usr/share/doc/perl-Parse-RecDescent-1.967009/demo/demo_skipcomment.pl
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#!/usr/bin/perl -ws # REMOVE COMMENTS FROM C++ CODE use strict; use Parse::RecDescent; use vars qw/ $Grammar /; $RD_TRACE=1; my $parser = new Parse::RecDescent $Grammar or die "invalid grammar"; undef $/; my $text = @ARGV ? <> : <DATA>; print join " ", @{$parser->program($text) or die "malformed C program"}; BEGIN { $Grammar=<<'EOF'; program : <skip:qr/(\s+|#.*\n)*/> part(s) part : /\S+/ EOF } __DATA__ Now we find # to our inexpressible joy That the parser # a cunningly wrought thing Skips both whitespace # the usual behaviour # though it be configurable And comments #however many there be
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