NAME

Venus::Error - Error Class

ABSTRACT

Error Class for Perl 5

SYNOPSIS

package main;

use Venus::Error;

my $error = Venus::Error->new;

# $error->throw;

DESCRIPTION

This package represents a context-aware error (exception object). The default for error verbosity can be controlled via the VENUS_ERROR_VERBOSE environment variable, e.g. a setting of 0 disables stack traces. The default trace-offset can be controlled via the VENUS_ERROR_TRACE_OFFSET environment variable, e.g. a setting of 0 indicates no offset.

ATTRIBUTES

This package has the following attributes:

name

name(Str)

This attribute is read-write, accepts (Str) values, and is optional.

context

context(Str)

This attribute is read-write, accepts (Str) values, is optional, and defaults to '(None)'.

message

message(Str)

This attribute is read-write, accepts (Str) values, is optional, and defaults to 'Exception!'.

verbose

verbose(Int)

This attribute is read-write, accepts (Int) values, is optional, and defaults to 1.

INHERITS

This package inherits behaviors from:

Venus::Kind::Utility

INTEGRATES

This package integrates behaviors from:

Venus::Role::Explainable

Venus::Role::Stashable

METHODS

This package provides the following methods:

as

as(Str $name) (Error)

The as method returns an error object using the return value(s) of the "as" method specified, which should be defined as "as_${name}", which will be called automatically by this method. If no "as_${name}" method exists, this method will set the "name" attribute to the value provided.

Since 1.02

as example 1

package System::Error;

use Venus::Class;

base 'Venus::Error';

sub as_auth_error {
  my ($self) = @_;

  return $self->do('message', 'auth_error');
}

sub as_role_error {
  my ($self) = @_;

  return $self->do('message', 'role_error');
}

sub is_auth_error {
  my ($self) = @_;

  return $self->message eq 'auth_error';
}

sub is_role_error {
  my ($self) = @_;

  return $self->message eq 'role_error';
}

package main;

my $error = System::Error->new->as('auth_error');

$error->throw;

# Exception! (isa Venus::Error)

as example 2

package System::Error;

use Venus::Class;

base 'Venus::Error';

sub as_auth_error {
  my ($self) = @_;

  return $self->do('message', 'auth_error');
}

sub as_role_error {
  my ($self) = @_;

  return $self->do('message', 'role_error');
}

sub is_auth_error {
  my ($self) = @_;

  return $self->message eq 'auth_error';
}

sub is_role_error {
  my ($self) = @_;

  return $self->message eq 'role_error';
}

package main;

my $error = System::Error->new->as('role_error');

$error->throw;

# Exception! (isa Venus::Error)

as example 3

package Virtual::Error;

use Venus::Class;

base 'Venus::Error';

package main;

my $error = Virtual::Error->new->as('on_save_error');

$error->throw;

# name is "on_save_error"

# Exception! (isa Venus::Error)

as example 4

package Virtual::Error;

use Venus::Class;

base 'Venus::Error';

package main;

my $error = Virtual::Error->new->as('on.SAVE.error');

$error->throw;

# name is "on_save_error"

# Exception! (isa Venus::Error)

explain

explain() (Str)

The explain method returns the error message and is used in stringification operations.

Since 0.01

explain example 1

# given: synopsis;

my $explain = $error->explain;

# "Exception! in ...

frame

frame(Int $index) (HashRef)

The frame method returns the data from caller on the frames captured, and returns a hashref where the keys map to the keys described by "caller" in perlfunc.

Since 1.11

frame example 1

# given: synopsis;

my $frame = $error->frame;

# {
#   'bitmask' => '...',
#   'evaltext' => '...',
#   'filename' => '...',
#   'hasargs' => '...',
#   'hinthash' => '...',
#   'hints' => '...',
#   'is_require' => '...',
#   'line' => '...',
#   'package' => '...',
#   'subroutine' => '...',
#   'wantarray' => '...',
# }

frame example 2

# given: synopsis;

my $frame = $error->frame(1);

# {
#   'bitmask' => '...',
#   'evaltext' => '...',
#   'filename' => '...',
#   'hasargs' => '...',
#   'hinthash' => '...',
#   'hints' => '...',
#   'is_require' => '...',
#   'line' => '...',
#   'package' => '...',
#   'subroutine' => '...',
#   'wantarray' => '...',
# }

frames

frames() (ArrayRef)

The frames method returns the compiled and stashed stack trace data.

Since 0.01

frames example 1

# given: synopsis;

my $frames = $error->frames;

# [
#   ...
#   [
#     "main",
#     "t/Venus_Error.t",
#     ...
#   ],
# ]

is

is(Str $name) (Bool)

The is method returns truthy or falsy based on the return value(s) of the "is" method specified, which should be defined as "is_${name}", which will be called automatically by this method. If no "is_${name}" method exists, this method will check if the "name" attribute is equal to the value provided.

Since 1.02

is example 1

package System::Error;

use Venus::Class;

base 'Venus::Error';

sub as_auth_error {
  my ($self) = @_;

  return $self->do('message', 'auth_error');
}

sub as_role_error {
  my ($self) = @_;

  return $self->do('message', 'role_error');
}

sub is_auth_error {
  my ($self) = @_;

  return $self->message eq 'auth_error';
}

sub is_role_error {
  my ($self) = @_;

  return $self->message eq 'role_error';
}

package main;

my $is = System::Error->new->as('auth_error')->is('auth_error');

# 1

is example 2

package System::Error;

use Venus::Class;

base 'Venus::Error';

sub as_auth_error {
  my ($self) = @_;

  return $self->do('message', 'auth_error');
}

sub as_role_error {
  my ($self) = @_;

  return $self->do('message', 'role_error');
}

sub is_auth_error {
  my ($self) = @_;

  return $self->message eq 'auth_error';
}

sub is_role_error {
  my ($self) = @_;

  return $self->message eq 'role_error';
}

package main;

my $is = System::Error->as('auth_error')->is('auth_error');

# 1

is example 3

package System::Error;

use Venus::Class;

base 'Venus::Error';

sub as_auth_error {
  my ($self) = @_;

  return $self->do('message', 'auth_error');
}

sub as_role_error {
  my ($self) = @_;

  return $self->do('message', 'role_error');
}

sub is_auth_error {
  my ($self) = @_;

  return $self->message eq 'auth_error';
}

sub is_role_error {
  my ($self) = @_;

  return $self->message eq 'role_error';
}

package main;

my $is = System::Error->as('auth_error')->is('role_error');

# 0

is example 4

package Virtual::Error;

use Venus::Class;

base 'Venus::Error';

package main;

my $is = Virtual::Error->new->as('on_save_error')->is('on_save_error');

# 1

is example 5

package Virtual::Error;

use Venus::Class;

base 'Venus::Error';

package main;

my $is = Virtual::Error->new->as('on.SAVE.error')->is('on_save_error');

# 1

of

of(Str $name) (Bool)

The of method returns truthy or falsy based on the return value(s) of the "of" method specified, which should be defined as "of_${name}", which will be called automatically by this method. If no "of_${name}" method exists, this method will check if the "name" attribute contains the value provided.

Since 1.11

of example 1

package System::Error;

use Venus::Class;

base 'Venus::Error';

sub as_auth_error {
  my ($self) = @_;

  return $self->do('name', 'auth_error');
}

sub as_role_error {
  my ($self) = @_;

  return $self->do('name', 'role_error');
}

sub is_auth_error {
  my ($self) = @_;

  return $self->name eq 'auth_error';
}

sub is_role_error {
  my ($self) = @_;

  return $self->name eq 'role_error';
}

package main;

my $of = System::Error->as('auth_error')->of('role');

# 0

of example 2

package System::Error;

use Venus::Class;

base 'Venus::Error';

sub as_auth_error {
  my ($self) = @_;

  return $self->do('name', 'auth_error');
}

sub as_role_error {
  my ($self) = @_;

  return $self->do('name', 'role_error');
}

sub is_auth_error {
  my ($self) = @_;

  return $self->name eq 'auth_error';
}

sub is_role_error {
  my ($self) = @_;

  return $self->name eq 'role_error';
}

package main;

my $of = System::Error->as('auth_error')->of('auth');

# 1

of example 3

package System::Error;

use Venus::Class;

base 'Venus::Error';

sub as_auth_error {
  my ($self) = @_;

  return $self->do('name', 'auth_error');
}

sub as_role_error {
  my ($self) = @_;

  return $self->do('name', 'role_error');
}

sub is_auth_error {
  my ($self) = @_;

  return $self->name eq 'auth_error';
}

sub is_role_error {
  my ($self) = @_;

  return $self->name eq 'role_error';
}

package main;

my $of = System::Error->as('auth_error')->of('role_error');

# 0

of example 4

package Virtual::Error;

use Venus::Class;

base 'Venus::Error';

package main;

my $of = Virtual::Error->new->as('on_save_error')->of('on.save');

# 1

of example 5

package Virtual::Error;

use Venus::Class;

base 'Venus::Error';

package main;

my $of = Virtual::Error->new->as('on.SAVE.error')->of('on.save');

# 1

throw

throw(Any @data) (Error)

The throw method throws an error if the invocant is an object, or creates an error object using the arguments provided and throws the created object.

Since 0.01

throw example 1

# given: synopsis;

my $throw = $error->throw;

# bless({ ... }, 'Venus::Error')

trace

trace(Int $offset, Int $limit) (Error)

The trace method compiles a stack trace and returns the object. By default it skips the first frame.

Since 0.01

trace example 1

# given: synopsis;

my $trace = $error->trace;

# bless({ ... }, 'Venus::Error')

trace example 2

# given: synopsis;

my $trace = $error->trace(0, 1);

# bless({ ... }, 'Venus::Error')

trace example 3

# given: synopsis;

my $trace = $error->trace(0, 2);

# bless({ ... }, 'Venus::Error')

OPERATORS

This package overloads the following operators:

operation: (eq)

This package overloads the eq operator.

example 1

# given: synopsis;

my $result = $error eq 'Exception!';

# 1

operation: (ne)

This package overloads the ne operator.

example 1

# given: synopsis;

my $result = $error ne 'exception!';

# 1

operation: (qr)

This package overloads the qr operator.

example 1

# given: synopsis;

my $test = 'Exception!' =~ qr/$error/;

# 1

operation: ("")

This package overloads the "" operator.

example 1

# given: synopsis;

my $result = "$error";

# "Exception!"

operation: (~~)

This package overloads the ~~ operator.

example 1

# given: synopsis;

my $result = $error ~~ 'Exception!';

# 1

To install Venus, copy and paste the appropriate command in to your terminal.

cpanm

cpanm Venus

CPAN shell

perl -MCPAN -e shell
install Venus

For more information on module installation, please visit the detailed CPAN module installation guide.

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NAME

ABSTRACT

SYNOPSIS

DESCRIPTION

ATTRIBUTES

name

context

message

verbose

INHERITS

INTEGRATES

METHODS

as

explain

frame

frames

is

of

throw

trace

OPERATORS

Module Install Instructions