Data::Util::JA(3pm)

User Contributed Perl Documentation

Data::Util::JA(3pm)

NAME¶

Data::Util::JA - XXXXXXXXXXXXXXXXXXXX

VERSION¶

This document describes Data::Util version 0.63

SYNOPSIS¶

        use Data::Util qw(:validate);

        sub foo{
                # they will die if invalid values are supplied
                my $sref = scalar_ref(shift);
                my $aref = array_ref(shift);
                my $href = hash_ref(shift);
                my $cref = code_ref(shift);
                my $gref = glob_ref(shift);
                my $rref = regex_ref(shift);
                my $obj  = instance(shift, 'Foo');
                # ...
        }

        use Data::Util qw(:check);

        sub bar{
                my $x = shift;
                if(is_scalar_ref $x){
                        # $x is an array reference
                }
                # ...
                elsif(is_instance $x, 'Foo'){
                        # $x is an instance of Foo
                }
                # ...
        }

        # miscelaneous
        use Data::Util qw(:all);

        my $x = anon_scalar();
        $x = anon_scalar($x); # OK

        my $stash = get_stash('Foo');

        install_subroutine('Foo',
                hello  => sub{ "Hello!\n" },
                goodby => sub{ "Goodby!\n" },
        );

        print Foo::hello(); # Hello!

        my($pkg, $name) = get_code_info(\&Foo::hello); # => ('Foo', 'hello')
        my $fqn         = get_code_info(\&Foo::hello); # =>  'Foo::Hello'
        my $code        = get_code_ref($fqn);          # => \&Foo::hello

        uninstall_subroutine('Foo', qw(hello goodby));

        print neat("Hello!\n"); # => "Hello!\n"
        print neat(3.14);       # => 3.14
        print neat(undef);      # => undef

DESCRIPTION¶

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXSXPure PerlXXXXXXXXXXXCXXXXXXXX XXXXXSXXXXXXXXXXXXXXPure PerlXXXXXXXXXXXXXX XXXXXXX"DATA_UTIL_PUREPERL"XXXXXXXXXXXXXXXPure Perl XXXXXXXXXXXXXXXXXXX

XSXXXXXXXXXXXXXXXXXXX Pure PerlXXXXXXXX2XXX10XXXXXXXXXXXX XXXXSXXXXXXXXXXXXXXXXXXXXXXXPure PerlXXXX XXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXbenchmark/XXXXXXXXXXXXXXXXXXX

INTERFACE¶

Check functions¶

XXXXXXXX":check"XXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"${}"X XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

is_scalar_ref(value)

XXXXXXXXXXXXXXXXXXXXXXXXX

is_array_ref(value)

XXXXXXXXXXXXXXXXXXXXXXX

is_hash_ref(value)

XXXXXXXXXXXXXXXXXXXXXXXXX

is_code_ref(value)

XXXXXXXXXXXXXXXXXXXXXXXX

is_glob_ref(value)

XXXXXXXXXXXXXXXXXXXXXXXX

is_regex_ref(value)

"qr//"XXXXXXXXXXXXXXXXXXXXXXXXXXX

is_instance(value, class)

classXXXXXXXXXXXXXXXXXXXXXX

"Scalar::Util::blessed($value) && $value->isa($class)"XXXXXXX XXXXXXX

classXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

is_invocant(value)

valueXXXXXXXXXXXXXXXXXXXXXXXXXXX

is_value(value)

valueXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXX(XXX"is_string"/"is_number()"/"is_integer()")XX XXXXXXXXXXXXXXXXXXXXXXXXXX XXXvalueXXXXX/XXX/XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXX

is_string(value)

valueXXXXXXXXXXXX XXXXXXXXXXX1XXXXXXXXXXXXXXXXXXXXXXXX

"do{ is_value($value) && length($value) > 0 }"XXXXXX

XXXXXXXXXXXXXXXXXXXXXX

is_number(value)

valueXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX(XXXX"sprintf '%g', $value"X XXXXXXXXXXXXXXXXXXX XXPerlXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXX"Scalar::Util::looks_like_number()"XXXXX "Infinity"X"NaN"XXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX "0 but true"XXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXX

is_integer(value)

valueXXXXXXXXXXXXXXXXXXX"is_number()"XXXXXXXX XXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXX

Validating functions¶

XXXXX":validate"XXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXX

scalar_ref(value): XXXXXXXXXXXXXXXXXXXXXXX
array_ref(value): XXXXXXXXXXXXXXXXXXXXX
hash_ref(value): XXXXXXXXXXXXXXXXXXXXXXX
code_ref(value): XXXXXXXXXXXXXXXXXXXXXX
glob_ref(value): XXXXXXXXXXXXXXXXXXXXXX
regex_ref(value): "qr//"XXXXXXXXXXXXXXXXXXXXXXXXX
instance(value, class): classXXXXXXXXXXXXXXXXXXXX
classXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
invocant(value): valueXXXXXXXXXXXXXXXXXXXXXXXXXXX
valueXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXX"::Foo"X"main::Foo"XXXXX"Foo"XXXXXX

Micellaneous utilities¶

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

anon_scalar()

"undef"XXXXXXXXXXXXXXXXXXXXXXXX

anon_scalar(value)

valueXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXX"do{ my $tmp = $value; \$value; }"XXXXXXXXXXXX

neat(value)

valueXXXXXXXXXXXXXXXXXXXXXX "do{ defined($value) ? qq{"$value"} : 'undef' }"XXXXXXXX XXXXXXXXXXXXXXXXXXX

get_stash(invocant)

invocantXXXXXX stashXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXX

invocantXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXX

invocantXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXX

install_subroutine(package, name => subr [, ...])

XXXXXXsubrXpackageXnameXXXXXXXXXXXXX

"do{ no strict 'refs'; *{$package.'::'.$name} = \&subr; }"XXXXXXX XXXXXXXXXXXsubrXXXXXXXXXXXXXXpackageX XXXXXXXXXX&package::nameXXXXXXXX(XXXXPure PerlXXXXXXXXXXXXXXXXXXXXXXXX)X

XXXXXXXXXXXXXXXXXXXX"no warnings 'redefine'" XXXXXXXXXXXXXXXX

        no warnings 'redefine';
        install_subrouitne($package, $name => $subr);

packageXnameXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX subrXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXX

XXXXX"no strict 'refs'"XXXXXXXXXXstrictXXXXXXXXXXXXXXXXXXXstrictXXXXXXXXXXXXXXXXXXXXXXX

        my $property = ...;
        # ...

        no strict 'refs';
        # simple read-only accessor
        *{$pkg . '::' . $sub_name} = sub{
                my($self) = @_;
                return $self->{$property};
        }

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXX$selfXXXXXXXXXXXXXXXXXXXXX "$self->{$property}"XXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXX"undef"XXXXXXXXXX "<use strict 'refs'">XXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXstrictXXXXXXXXXXXXXXXXXXXXXXXXX "use strict"XXXXXXXXXXXXXX

        no strict 'refs';
        *{$pkg . '::' . $sub_name} = sub{
                use strict 'refs';
                my($self) = @_;
                return $self->{$property};
        }

XXXX"install_subroutine()"XXXXX"strict"XXXXXXXXXXXXXXX

        install_subroutine $pkg => (
                $sub_name => sub{
                        my($self) = @_;
                        return $self->{$property};
                },
        );

XXstrictXXXXXXXXXXXX"18.10" in "PerlXXXXXXXXX" XXXXXXX - XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXX

uninstall_subroutine(package, name [=> code], ...)

XXXXXXnameXXXXXXpackageXXXXXXXX

"undef &subr"X&subrXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXX"uninstall_subroutine"XXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXX XXXXX"namespace::clean"X"constant::lexical"XXXXXXXXXXXXX

nameXXXXcodeXXXXXXXXXXXX&package::nameXcodeXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

        uninstall_subroutine($pkg, $name) if \&{$pkg . '::' . $name} == $code;
        uninstall_subroutine($pkg, $name => $code);

XXXXX"Sub::Delete::delete_sub()"XXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXX

get_code_info(subr)

XXXXXXsubrXXXXXXXXXXXXXXXXXX XXX"Sub::Identify::get_code_info()"XXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXX

subrXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXX"undef"XXXXXX

get_code_ref(package, name)

\&package::nameXXXXXXXXXXXXXXX XXX"do{ no strict 'refs'; *{$package . '::' . $name}{CODE} }" XXXXXXXX\&package::nameXXXXXXXXXX *package::nameXXXXXXXX

XXXXXXX"-create"XXXXXX\&package::nameXXXXXXXX XXXXXXXXXXXXXXXX XXX"do{ no strict 'refs'; \&{$package . '::' . $name} }"XXXXXX

curry(subr, args and/or placeholders)

XXXXXXsubrXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXX

args and/or placeholdersXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXxXXX XX"\x"XX"\x"XXXXXXXXXXXXXXXXXXXXXXXXX *_XXXXXX

XXXXXXXX$closureX$curriedXXXXXXXXXXXXXXXXXXXX

        my $class = 'Foo';
        $closure = sub{ is_instance($_[0], $class) };
        $curried = curry \&is_instance, \0, $class;

        $closure = sub{ install_subroutine($class, @_) };
        $curried = curry \&install_subroutine, $class, *_;

XXX*_X"\x"XXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXX"curry(\&subr, *_, \1)->(0, 1, 2, 3)"XXXXXXXXXX "subr(2, 3, 1)"XXXXXXXXXXXXXXXXXXXXXXXXXX $_[0](XXX0)XXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXData::Util::CurryXXXXXX

modify_subroutine(subr, modifier_type => [subroutines], ...)

XXXXXXsubrXmodifier_typeXXXXXXsubroutinesXXXXX XXXXmodified_subrXXXXXXXX

modifier_typeXX"before", "around", "after"XXXX"before"X subrXXXXXXXX"after"XsubrXXXXXXXmodified_subrX XXXXXXXXXXXXXXXX"before"X"after"XXXXXXXXXXXX "around"XsubrXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXX"before"X"around"XXXXXXXXXXXXXXXXXX (last-defined-first-called)X"after"XXXXXXXXXXXXXXXXXXXX(first-defined-first-called)XXXXXXXXX"subroutine_modifier()"XXXX XXX

XXXXX

        $modified = modify_subroutine(\&foo, around => [sub{
                my $next = shift;
                do_something();
                goto &{$next}; # continuation
        }]);
        $modified->();

        $modified = modify_subroutine(\&foo,
                before => \@befores,
                around => \@arounds,
                after  => \@afters,
        );
        $modified->();

XSXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXexample/lib/Method/Modifiers.pm ("modify_subroutine()"/"subroutine_modifier()"XXX)XXXXXXX benchmark/methext_bench.plXXXXXXXXXXXXXXXXXXXXXXXXXXXX

        with before modifier: 100% slower
        with after  modifier: 100% slower
        with around modifier: 200% slower

XXX"before"X"after"X"SUPER::"XXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXX"Method Modifiers" in Class::MOP::ClassX XXXXXXXXXXXClass::Method::ModifiersXXXXXXXXXX XXXXXXXXXXXXAPIXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXX

subroutine_modifier(modified, modifier_type => subroutines, ...)

"modify_subroutine()"XXXXXmodifiedXXXXXXX

XXXmodifiedXXXXXXXXXXXmodifiedX"modify_subroutine()"X XXXXXXXXXXXXXXXXXXXXXXX

        if(subroutine_modifier $subr){
                # $subrXXXXXXXXXXXX
        }

modifiedXmodifier_type("before", "around", "after") XXXXXXXmodifier_typeXXXXXXXXXXXXXX

        @befores = subroutine_modifier $modified, 'before';

XXXXXXXXXXXXXXXXXXXXXXmodifiedXmodifier_typeX XXXXXXXXXXX

        subroutine_modifier $modified, before => @befores;

mkopt(input, moniker, require_unique, must_be)

inputXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXX"Data::OptList::mkopt()"XXXXXXXXXXXXXXmust_beX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

For example:

        $array_ref = mkopt([qw(foo bar), baz => [42]], 'moniker');
        # $array_ref == [ [foo => undef], [bar => undef], baz => [42] ]

mkopt_hash(input, moniker, must_be)

inputXXXXXXXXXXXXXXXXXXXX

XXX"Data::OptList::mkopt_hash()"XXXXXXXXXXXXXXmust_beX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

For example:

        $hash_ref = mkopt([qw(foo bar), baz => [42]], 'moniker');
        # $hash_ref == { foo => undef, bar => undef, baz => [42] }

Error handling¶

XXXXXXXXXXXXXXXXXXXXX"Data::Util::Error"XXXXXXXXXXXXXXXXXXXXX

        package Foo;
        use Data::Util::Error sub{ Foo::InvalidArgument->throw(@_) };
        use Data::Util qw(:validate);

        # ...

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"Data::Util"XXXXXXXXXXXXXXXXXXXXXXXXXXX

DISCUSSIONS¶

What is a X-reference?¶

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXX3XXXXXXXX

1.: "ref($x) eq 'HASH'"
2.: "Scalar::Util::reftype($x) eq 'HASH'"
3.: "overload::Method($x, '%{}')"

"ref()"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

"reftype()"XXXXXXXXXXXXX$xXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXX"overload::Method"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXX$xXXXXXXXXXXXXXXXXXXXXXX("$x->{$key}")XXXXXXXXXXXX$xXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXX"is_hash_ref()"XXXXXXXXXXXXXXXXXXXXXX"Params::Util"XXXXXXXXVersion 0.35XXXXXX"P::U::_HASH"X(1)XX"P::U::_HASHLIKE"X(2)X(3)XXXXXXXXXXXXXXXXXXXXX(1)XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX(2)XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"is_hash_ref()"X(1)X(3)XXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXX"is_hash_ref()"XX"ref()"X"overload::Method()"XXXXXXXXXXXXXXXXXX"is_scalar_ref()"X"is_array_ref()"X"is_code_ref()"X"is_glob_ref()"XXXXXX

ENVIRONMENT VARIABLES¶

DATA_UTIL_PUREPERL¶

XXXXXXPure PerlXXXXXXXXXXXXXXX

DEPENDENCIES¶

Perl 5.10 or later.

BUGS AND LIMITATIONS¶

No bugs have been reported.

Please report any bugs or feature requests to the author.

AUTHOR¶

Goro Fuji (gfx) <gfuji(at)cpan.org>

LICENSE AND COPYRIGHT¶

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

2016-08-02

perl v5.24.1

Source file:	Data::Util::JA.3pm.en.gz (from libdata-util-perl 0.65-1+b1)
Source last updated:	2016-08-02T00:50:13Z
Converted to HTML:	2019-06-03T08:12:59Z

NAME¶

VERSION¶

SYNOPSIS¶

DESCRIPTION¶

INTERFACE¶

Check functions¶

Validating functions¶

Micellaneous utilities¶

Error handling¶

DISCUSSIONS¶

What is a X-reference?¶

ENVIRONMENT VARIABLES¶

DATA_UTIL_PUREPERL¶

DEPENDENCIES¶

BUGS AND LIMITATIONS¶

SEE ALSO¶

AUTHOR¶

LICENSE AND COPYRIGHT¶