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文件: /usr/share/doc/perl-Parse-RecDescent-1.967009/demo/demo_bad.pl
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use v5.10; use warnings; # SHOWCASE VARIOUS ERROR MESSAGES WITH A VERY UNWELL GRAMMAR use Parse::RecDescent; open (Parse::RecDescent::ERROR, ">-") or die; $grammar = q{ <warn:3> typedef : a ... ...! ... b typedef : a ...!...!...!...! b | /type/ ident /has/ field(s) /end type/ { $result = $item[2]; } | /type/ ident /is/ ident { $result = $item[2]; } | quasit(s) | quasit(-1..3) | quasit(..0) | field(?) field end | <error> quasit "here" ...!/why/ Extend: extend Replace: replace $%^@# field : /field/ ident /is/ ident | field quasit | !quasit(s?) !| #NOTHING typedef : whatever package somewhereelse !ident : /[A-Za-z]\w*???/ { $result = $item[1]; } quasit : field | typedef }; new Parse::RecDescent ($grammar) || die "Bad grammar! No biscuit!\n";
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