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
|
#!/usr/bin/perl
use strict;
use warnings;
my @stack = ();
sub firstfield {
my $arg = shift;
if (!defined($arg)) { return undef; }
$arg =~ /([^\t]*)/;
return $1;
}
while (<STDIN> =~ /(\w)\t([^\t]*)\t(.*)/) {
my ($action, $called, $rest) = ($1, $2, $3);
if ($action eq "e") {
push(@stack, "$called\t$rest");
print "e\t$called\t$rest\n";
}
elsif ($action eq "x") {
my $parent = pop(@stack);
if (defined $parent) {
my $parentcalled = firstfield($parent);
while (defined $parent and $parentcalled ne $called) {
print "x\t$parentcalled\t$rest\n";
$parent = pop(@stack);
$parentcalled = firstfield($parent);
}
}
print "x\t$called\t$rest\n";
}
}
|
