Rechercher une page de manuel
Devel::Trace.3pm
Langue: en
Version: 1999-09-06 (mandriva - 01/05/08)
Section: 3 (Bibliothèques de fonctions)
NAME
Devel::Trace - Print out each line before it is executed (like "sh -x")SYNOPSIS
perl -d:Trace program
DESCRIPTION
If you run your program with "perl -d:Trace program", this module will print a message to standard error just before each line is executed. For example, if your program looks like this:#!/usr/bin/perl
print "Statement 1 at line 4\n"; print "Statement 2 at line 5\n"; print "Call to sub x returns ", &x(), " at line 6.\n";
exit 0;
sub x { print "In sub x at line 12.\n"; return 13; }
Then the "Trace" output will look like this:
>> ./test:4: print "Statement 1 at line 4\n"; >> ./test:5: print "Statement 2 at line 5\n"; >> ./test:6: print "Call to sub x returns ", &x(), " at line 6.\n"; >> ./test:12: print "In sub x at line 12.\n"; >> ./test:13: return 13; >> ./test:8: exit 0;
This is something like the shell's "-x" option.
DETAILS
Inside your program, you can enable and disable tracing by doing$Devel::Trace::TRACE = 1; # Enable $Devel::Trace::TRACE = 0; # Disable
or
Devel::Trace::trace('on'); # Enable Devel::Trace::trace('off'); # Disable
"Devel::Trace" exports the "trace" function if you ask it to:
import Devel::Trace 'trace';
Then if you want you just say
trace 'on'; # Enable trace 'off'; # Disable
TODO
- •
- You should be able to send the trace output to the filehandle of your choice.
- •
- You should be able to specify the format of the output.
- •
- You should be able to get the output into a string.
We'll see.
Author
Mark-Jason Dominus (C<mjd-perl-trace@plover.com>), Plover Systems co.See the C<Devel::Trace.pm> Page at http://www.plover.com/~mjd/perl/Trace for news and upgrades.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre