| Server IP : 85.214.239.14 / Your IP : 3.138.114.113 Web Server : Apache/2.4.62 (Debian) System : Linux h2886529.stratoserver.net 4.9.0 #1 SMP Tue Jan 9 19:45:01 MSK 2024 x86_64 User : www-data ( 33) PHP Version : 7.4.18 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, MySQL : OFF | cURL : OFF | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : OFF Directory : /proc/self/root/usr/share/doc/libparse-recdescent-perl/examples/ |
Upload File : |
#!/usr/bin/perl -ws
BEGIN
{
unless (-f "Calc.pm")
{
print "You first need to build Calc.pm.\n\n",
"Try: perl -MParse::RecDescent - calc_grammar Calc\n",
" or: demo_buildcalc.pl\n\n";
exit;
}
}
use Parse::RecDescent;
use Calc;
sub evalop
{
# my (@list) = @{[@{$_[0]}]};
my (@list) = @{$_[0]};
my $val = shift(@list)->();
while (@list)
{
my ($op, $arg2) = splice @list, 0, 2;
$op->($val,$arg2->());
}
return $val;
}
my $parse = Calc->new() or die "bad grammar";
print "> ";
while (<DATA>) { # FOR DEMO CHANGE TO: while (<DATA>)
print $parse->main($_), "\n\n> ";
}
__DATA__
$x = 2
$y = 3
+1-1+1-1+1-1+1-1+1
7*7-6*8
121/(121/11)/121*11
1/(10-1/(1/(10-1)))
$x * $y
foreach $i (1..$y) $x = $x * 2 + $i
$x