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package Params::Callbacks; |
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BEGIN { $Params::Callbacks::VERSION = '2.152500'; } |
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=pod |
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=encoding utf-8 |
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=head1 NAME |
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Params::Callbacks - Make your subroutines accept blocking callbacks |
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=head1 VERSION |
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version 2.152500 |
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=head1 SYNOPSIS |
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use Params::Callbacks 'callbacks', 'callback'; # Or use ':all' tag |
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use Data::Dumper; |
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$Data::Dumper::Indent = 0; |
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$Data::Dumper::Terse = 1; |
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sub foo |
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{ |
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my ( $callbacks, @params ) = &callbacks; |
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# If &callbacks makes the hairs |
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# on your neck standp, then use |
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# a cleaner alternative: |
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# |
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# - callbacks(@_), or ... |
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# - Params::Callbacks->new(@_) |
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return $callbacks->transform(@params); |
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} |
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# No callbacks; no change to result! |
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my @result_1 = foo( 0, 1, 2, 3 ); |
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print Dumper( [@result_1] ), "\n"; # [0,1,2,3] |
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# With callback, result is transformed before being returned! |
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my @result_2 = foo( 0, 1, 2, 3, callback { 0 + 2 ** $_ } ); |
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print Dumper( [@result_2] ), "\n"; # [1,2,4,8] |
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# With multiple callbacks, result is transformed in multiple stages |
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my @result_3 = foo( 0, 1, 2, 3, callback { 0 + 2 ** $_ } |
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callback { 0 + 10 * $_ }); |
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print Dumper( [@result_3] ), "\n"; # [10,20,40,80]; |
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=head1 DESCRIPTION |
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Use this module to enable a function or method to accept optional blocking |
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callbacks. Perhaps you would like to allow the caller to accept your function's |
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return value as is, or to intercept, change, eliminate, or otherwise process that |
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result before it is finally returned. |
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=head2 How callbacks are identified and processed |
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Callbacks are passed to your function by placing them at the end of the call's |
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argument list. This module provides you with a means to identify and separate any |
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callbacks from your function's arguments. It also provides dispatchers that will |
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pass the return value into the callback chain and capture the result, ready to |
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pass it back up to the caller. |
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Callbacks work simply enough. Like any function, they accept input in C<@_> |
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and their output is returned explicitly or as the result of their terminal |
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expression. When chaining together multiple callbacks, the dispatcher takes |
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the function's return value and passes it to the first callback; the output |
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from that callback is then passed to the following callback, and so on until |
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their are no more callbacks to process the value. The result of the final |
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callback is returned to the program ready to be returned to the caller. |
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As a convenience, a callback also receives a copy of the input value in C<$_>. |
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If an empty list is returned then the value is discarded and the callback |
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chain is terminated for that value. |
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=head2 Creating and passing callbacks into a function |
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################################## |
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# We define our MyModule.pm file # |
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################################## |
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package MyModule; |
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use Exporter; |
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use Params::Callbacks 'callbacks'; |
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use namespace::clean; |
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use Params::Callbacks 'callback'; |
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our @EXPORT = 'callback'; |
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our @EXPORT_OK = 'awesome'; |
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our @ISA = 'Exporter'; |
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sub awesome { |
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my ( $callbacks, @names ) = &callbacks; |
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return $callbacks->transform(@names); |
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} |
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1; |
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############################# |
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# Meanwhile, back in main:: # |
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############################# |
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# No callbacks ... |
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# |
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use MyModule 'awesome'; |
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my @team = awesome('Imran', 'Merlyn', 'Iain'); |
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print "$_\n" for @team; |
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# |
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# Imran |
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# Merlyn |
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# Iain |
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# |
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# (Not so awesome.) |
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# With a callback ... |
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# |
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use MyModule 'awesome'; |
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my @team = awesome('Imran', 'Merlyn', 'Iain', callback { |
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"$_, you're awesome!" |
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}); |
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print "$_\n" for @team; |
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# |
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# Imran, you're awesome! |
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# Merlyn, you're awesome! |
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# Iain, you're awesome! |
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# |
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# (This time with added awesome!) |
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# With two callbacks ... |
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# |
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use MyModule 'awesome'; |
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my @team = awesome('Imran', 'Merlyn', 'Iain', callback { |
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"$_, you're awesome!" |
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} # Comma is optional here. |
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callback { |
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print "$_[0]\n"; |
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return $_[0]; |
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}); |
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# |
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# Imran, you're awesome! |
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# Merlyn, you're awesome! |
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# Iain, you're awesome! |
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# |
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# (Moar awesome!) |
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=cut |
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use strict; |
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use warnings; |
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use Exporter (); |
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use Scalar::Util qw(blessed); |
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use Carp qw(confess); |
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use namespace::clean; |
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our @ISA = qw(Exporter); |
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our @EXPORT_OK = qw(callbacks callback); |
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our %EXPORT_TAGS = ( all => \@EXPORT_OK, ALL => \@EXPORT_OK ); |
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=head1 METHODS |
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=cut |
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=head2 new |
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Takes a list of scalar values, strips away any trailing callbacks and returns |
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a new list containing a blessed array reference (the callback chain) followed |
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by any values from the original list that weren't callbacks. |
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A typical use case would be processing a function's argument list C<@_>: |
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sub my_function |
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{ |
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( $callbacks, @params ) = Params::Callbacks->new(@_); |
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... |
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} |
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It is also possible to pass in a pre-prepared callback chain instead of |
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individual callbacks, in which case that value will be returned as the callback |
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chain, without inspecting the list for individual callbacks E this behaviour |
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is useful when the ability to efficiently forward callbacks onto a more deeply |
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nested call is required. |
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The output list is packaged in such a way as to make parsing the argument list |
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as easy as possible. |
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=cut |
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sub new |
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{ |
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my ( $class, @params ) = @_; |
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my @callbacks; |
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if ( blessed( $params[-1] ) ) { |
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if ( $params[-1]->isa(__PACKAGE__) ) { |
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my $callback_chain = pop(@params); |
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return ( bless( $callback_chain, $class ), @params ); |
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} |
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else { |
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while ( @params |
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&& blessed( $params[-1] ) |
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&& $params[-1]->isa('Params::Callbacks::Callback') ) |
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{ |
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unshift @callbacks, pop(@params); |
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} |
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} |
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} |
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return ( bless( \@callbacks, $class ), @params ); |
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} |
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216
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=head2 transform |
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Transform a result set by passing it through all the stages of the callbacks |
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pipeline. The transformation terminates if the result set is reduced to |
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nothing, and an empty result set is returned. |
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Empty or not, this method always returns a list. |
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=cut |
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sub transform |
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{ |
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my ( $callbacks, @data ) = @_; |
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confess |
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'E-PARAMS-CALLBACKS-001 Expected Params::Callbacks object reference as first argument' |
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unless ref($callbacks) && $callbacks->isa(__PACKAGE__); |
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for my $callback (@$callbacks) { |
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last unless @data; |
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@data = map { $callback->($_) } @data; |
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} |
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return @data; |
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} |
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=head2 smart_transform |
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Transform a result set by passing it through all the stages of the callbacks |
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pipeline. The transformation terminates if the result set is reduced to |
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nothing, and an empty result set is returned. |
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Empty or not, this method always returns a list if a list was wanted. |
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If a scalar is required, a scalar is returned. If the result set contains a |
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single element then the value of that element will be returned, otherwise a |
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count of the number of elements is returned. |
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=cut |
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sub smart_transform |
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{ |
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my @data = &transform; |
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unless (wantarray) { |
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my $result; |
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if ( @data != 1 ) { |
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$result = scalar(@data); |
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} |
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else { |
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$result = $data[0]; |
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} |
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return $result; |
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} |
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return @data; |
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} |
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=head1 EXPORTS |
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Nothing is exported by default. |
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The following functions are exported individually upon request; they may all be |
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imported at once using the import tags C<:all> and C<:ALL>. |
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=cut |
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=head2 callbacks |
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Takes a list of scalar values, strips away any trailing callbacks and returns |
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a new list containing a blessed array reference (the callback chain) followed |
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by any values from the original list that weren't callbacks. The typical |
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imagined use case is in processing a function's argument list C<@_>: |
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294
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sub my_function |
295
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{ |
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( $callbacks, @params ) = callbacks(@_); |
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... |
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} |
299
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300
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sub my_function |
301
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{ |
302
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( $callbacks, @params ) = &callbacks; |
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... |
304
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} |
305
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306
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It is also possible to pass in a pre-prepared callback chain instead of |
307
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individual callbacks, in which case this function will return that value |
308
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as its own callback chain, without inspecting the list for individual |
309
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callbacks. This behaviour is useful when forwarding callbacks onto a |
310
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more deeply nested call. |
311
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312
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The output list is packaged in such a way as to make parsing the argument list |
313
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as easy as possible. |
314
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315
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=cut |
316
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317
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318
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sub callbacks |
319
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{ |
320
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8
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8
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1
|
979
|
return __PACKAGE__->new(@_); |
321
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} |
322
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323
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=head2 callback |
324
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325
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|
A simple piece of syntactic sugar that announces a callback. The code |
326
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reference it precedes is blessed as a C |
327
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object, disambiguating it from unblessed subs that are being passed as |
328
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standard arguments. |
329
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330
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|
Multiple callbacks may be chained together with or without comma |
331
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|
separators: |
332
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333
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|
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|
|
callback { ... }, callback { ... }, callback { ... } # Valid |
334
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|
|
callback { ... } callback { ... } callback { ... } # Valid, too! |
335
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336
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|
|
=cut |
337
|
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338
|
|
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|
339
|
|
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|
|
sub callback (&;@) |
340
|
|
|
|
|
|
|
{ |
341
|
14
|
|
|
14
|
1
|
650
|
my ( $callback, @params ) = @_; |
342
|
14
|
|
|
|
|
71
|
return ( bless( $callback, 'Params::Callbacks::Callback' ), @params ); |
343
|
|
|
|
|
|
|
} |
344
|
|
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|
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|
|
|
345
|
|
|
|
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|
|
1; |
346
|
|
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|
|
347
|
|
|
|
|
|
|
=head1 REPOSITORY |
348
|
|
|
|
|
|
|
|
349
|
|
|
|
|
|
|
=over 2 |
350
|
|
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|
|
351
|
|
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|
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|
|
=item * L |
352
|
|
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|
353
|
|
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|
|
=item * L |
354
|
|
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|
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|
|
355
|
|
|
|
|
|
|
=back |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
=head1 BUG REPORTS |
358
|
|
|
|
|
|
|
|
359
|
|
|
|
|
|
|
Please report any bugs to L |
360
|
|
|
|
|
|
|
|
361
|
|
|
|
|
|
|
=head1 AUTHOR |
362
|
|
|
|
|
|
|
|
363
|
|
|
|
|
|
|
Iain Campbell |
364
|
|
|
|
|
|
|
|
365
|
|
|
|
|
|
|
=head1 COPYRIGHT AND LICENSE |
366
|
|
|
|
|
|
|
|
367
|
|
|
|
|
|
|
This software is copyright (c) 2012-2015 by Iain Campbell. |
368
|
|
|
|
|
|
|
|
369
|
|
|
|
|
|
|
This is free software; you can redistribute it and/or modify it under |
370
|
|
|
|
|
|
|
the same terms as the Perl 5 programming language system itself. |
371
|
|
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|
|
|
|
|
372
|
|
|
|
|
|
|
=cut |