Error::Helper - Provides some easy error related methods.
Version 2.1.0
Below is a example script showing it's usage.
use warnings; use strict; { package Foo; use base 'Error::Helper'; sub new { my $arg = $_[1]; my $self = { perror => undef, error => undef, errorLine => undef, errorFilename => undef, errorString => "", errorExtra => { all_errors_fatal => 0, flags => { 1 => 'UndefArg', 2 => 'test', 3 => 'derp', 4 => 'test2', }, fatal_flags => { derp => 1, }, perror_not_fatal => 0, }, }; bless $self; # error if $arg is set to "test" if ( defined($arg) && $arg eq "test" ) { $self->{perror} = 1; $self->{error} = 2; $self->{errorString} = 'A value of "test" has been set'; $self->warn; return $self; } # error if $arg is set to "test2", error fatally if ( defined($arg) && $arg eq "test" ) { $self->{perror} = 1; $self->{error} = 4; $self->{errorString} = 'A value of "test" has been set'; $self->warn; return $self; } return $self; } ## end sub new sub foo { my $self = $_[0]; my $a = $_[1]; if ( !$self->errorblank ) { return undef; } if ( !defined($a) ) { $self->{error} = 1; $self->{errorString} = 'No value specified'; $self->warn; return undef; } # this will be fatal as it error flag derp is set to fatal if ( $a eq 'derp' ) { $self->{error} = 3; $self->{errorString} = 'foo was called with a value of derp'; $self->warn; } return 1; } ## end sub foo } my $foo_obj; eval { $foo_obj = Foo->new( $ARGV[0] ); # will never be evaulated as perrors are fatal if ( $foo_obj->error ) { warn( 'error:' . $foo_obj->error . ': ' . $foo_obj->errorString ); exit $foo_obj->error; } }; if ($@) { print 'Error: ' . $Error::Helper::error . "\nError String: " . $Error::Helper::errorString . "\nError Flag: " . $Error::Helper::errorFlag . "\nError File: " . $Error::Helper::errorFilename . "\nError Line: " . $Error::Helper::errorLine . "\nError Sub: " . $Error::Helper::errorSub . "\nError Sub Short: " . $Error::Helper::errorSubShort . "\nError Package: " . $Error::Helper::errorPackage . "\nError PackageShort: " . $Error::Helper::errorPackageShort . "\n"; exit $Error::Helper::error; } # catches fatal errors eval{ $foo_obj->foo( $ARGV[1] ); }; if ($@) { # do something... warn( '$foo_obj->foo( $ARGV[1] ) errored.... '.$@); if ($foo_obj->errorFlag eq 'derp') { warn('error flag derp found... calling again with a value of default'); $foo_obj->foo( 'default' ); } } elsif ($foo_obj->error) { # do something... warn( '$foo_obj->foo( $ARGV[1] ) errored'); }
There are five required variables in the blessed hash object.
- $self->{error} :: This contains the current error code. - Type :: int or undef - $self->{errorFilename} :: File from which $self->warn was called. - Type :: string or undef - $self->{errorLine} :: Line from which $self->warn was called. - Type :: int or undef - $self->{errorString} :: This contains a description of the current error. - Type :: string or undef - $self->{perror} :: This is set to true is a permanent error is present. If note, it needs set to false. - Type :: Perl boolean
The following are optional.
- $self->{errorExtra} :: This is a hash reserved for any additional Error::Helper items. - $self->{errorExtra}{all_errors_fatal} :: If true, this will die when $self->warn is called instead of printing the error to STDERR. This is for if you want to use it eval for capturing errors and this module more for handling grabbing error specifics, such as dieing and additional code based on the return of $self->errorFlag. - Type :: Perl boolean - Default :: undef - $self->{errorExtra}{fatal_errors} :: This is a hash in which the keys are errors codes that are fatal. When $self->warn is called it will check if the error code is fatal or not. $self->{errorExtra}{fatal_errors}{33}=>1 would be fatal, but $self->{errorExtra}{fatal_errors}{33}=>0 would now. - $self->{errorExtra}{flags} :: This hash contains error integer to flag mapping. The keys are the error integer and the value is the flag. For any unmatched error integers, 'other' is returned. - $self->{errorExtra}{fatal_flags} :: This is a hash in which the keys are error flags that are fatal. When $self->warn is called it will check if the flag for the error code is fatal or not. For the flag foo $self->{errorExtra}{fatal_flags}{foo}=>1 would be fatal, but $self->{errorExtra}{fatal_flags}{foo}=>0 would now. - $self->{errorExtra}{perror_not_fatal} :: Controls if $self->{perror} is fatal or not. - Type :: Perl boolean - Default :: undef
This module also sets several other variables as well for when something like a new method is called and dies, before something blessed can be returned. These allow examining the the error that resulted in it dieing.
The following are mapped to the the ones above.
$Error::Helper::perror $Error::Helper::error $Error::Helper::errorString $Error::Helper::errorFlag $Error::Helper::errorFilename $Error::Helper::errorLine
The following don't have mappings above.
- $Error::Helper::errorSub :: The sub that warn was called from. - $Error::Helper::errorSubShort :: Same as errorSub, but everything prior to the subname is removed. So Foo::bar would become bar. - $Error::Helper::errorPackage :: The package from which warn was called from. - $Error::Helper::errorPackageShort :: Saome as package, but everthing prior to the last item in the name space is removed. So Foo::Foo::Bar would just become Bar.
Returns the current error code and true if there is an error.
If there is no error, undef is returned.
if($self->error){ # do something }
This blanks the error storage and is only meant for internal usage.
It does the following.
$self->{error} = undef; $self->{errorFilename} = undef; $self->{errorLine} = undef; $self->{errorString} = "";
If $self->{perror} is set, it will not be able to blank any current errors.
This returns the filename in which the error occured or other wise returns undef.
if($self->error){ print 'error happened in '.$self->errorFilename."\n"; }
This returns the error flag for the current error.
If none is set, undef is returned.
This may be used in a similar manner as the error method.
if ( $self->errorFlag ){ if ( $self->errorFlag eq 'foo' ){ # do something }else{ die('error flag '.$self->errorFlag.' can not be handled'); } }
if($self->error){ print 'error happened at line '.$self->errorLine."\n"; }
Returns the error string if there is one. If there is not, it will return ''.
if($self->error){ warn('error: '.$self->error.":".$self->errorString); }
This returns a Perl boolean for if there is a permanent error or not.
if($self->perror){ warn('A permanent error is set'); }
Throws a warn like error message based using the contents of $self->errorString
$self->warn;
Throws a warn like error in the same for mate as warn, but with a freeform message.
This will not trigger any of the fatality checks. It will also not set any of the error values.
$self->warnString('some error');
Error flags are meant to be short non-spaced strings that are easier to remember than a specific error integer.
'other' is the generic error flag for when one is not defined.
An error flag should never evaluate to false if an error is present.
Zane C. Bowers-Hadley, <vvelox at vvelox.net>
<vvelox at vvelox.net>
Please report any bugs or feature requests to bug-error-helper at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Error-Helper. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
bug-error-helper at rt.cpan.org
You can find documentation for this module with the perldoc command.
perldoc Error::Helper
You can also look for information at:
RT: CPAN's request tracker
http://rt.cpan.org/NoAuth/Bugs.html?Dist=Error-Helper
Search CPAN
<https://metacpan.org/dist/Error-Helper>
Copyright 2023 Zane C. Bowers-Hadley.
This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.
See http://dev.perl.org/licenses/ for more information.
To install Error::Helper, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Error::Helper
CPAN shell
perl -MCPAN -e shell install Error::Helper
For more information on module installation, please visit the detailed CPAN module installation guide.