/usr/share/doc/libparse-recdescent-perl/examples/demo_derived.pl is in libparse-recdescent-perl 1.967009+dfsg-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | #!/usr/bin/perl -sw
# THE OL' "EMPTY SUBCLASS IN THE DEMO" TRICK.
use Parse::RecDescent;
sub Parse::RecDescent::f
{
print "Parse::RecDescent::f\n";
}
@DerParser::ISA = qw { Parse::RecDescent };
$grammar =
q{
typedef : /type/ ident /has/ <commit> field(s) 'end type'
{ $return = $item[2]; }
| /type/ ident ( /is/ | /are/ ) ident
{ $return = $item[2]; }
| <error>
field : /field/ ident /is/ ident
ident : /[A-Za-z]\w*/
{ f(); $return = $item[1]; }
};
$parse = new DerParser ( $grammar ) || die "\n";
$str = "
type student has
field name is text
field age
end type
";
print "> ", $parse->typedef($str) || "<failed (as expected)>", "\n";
$str = " type student has end type ";
print "> ", $parse->typedef($str) || "<failed (as expected)>", "\n";
$str = " type studentRec is student ";
print "> ", $parse->typedef($str) || "<failed (unexpectedly!)>", "\n";
|