NAME Earth - FP Framework ABSTRACT FP Framework for Perl 5 VERSION 0.03 SYNOPSIS package main; use Earth; wrap 'Digest::SHA', 'SHA'; call(SHA(), 'sha1_hex'); # "da39a3ee5e6b4b0d3255bfef95601890afd80709" DESCRIPTION Earth is a functional-programming framework for Perl 5. Perl is a multi-paradigm programming language that also supports functional programming, but, Perl has an intentionally limited standard library with an emphasis on providing library support via the CPAN which is overwhelmingly object-oriented. This makes developing in a functional style difficult as you'll eventually need to rely on a CPAN library that requires you to switch over to object-oriented programming. Earth facilitates functional programming for Perl 5 by providing functions which enable indirect routine dispatching, allowing the execution of both functional and object-oriented code. FUNCTIONS This package provides the following functions: args args(Any @args) (HashRef) The args function takes a list of arguments and returns a hashref. Since 0.04 args example 1 # given: synopsis args(content => 'example'); # {content => "example"} args example 2 # given: synopsis args({content => 'example'}); # {content => "example"} args example 3 # given: synopsis args('content'); # {content => undef} args example 4 # given: synopsis args('content', 'example', 'algorithm'); # {content => "example", algorithm => undef} call call(Str | Object | CodeRef $self, Any @args) (Any) The call function dispatches function and method calls to a package and returns the result. Since 0.01 call example 1 # given: synopsis call(SHA, 'sha1_hex'); # "da39a3ee5e6b4b0d3255bfef95601890afd80709" call example 2 # given: synopsis call('Digest::SHA', 'sha1_hex'); # "da39a3ee5e6b4b0d3255bfef95601890afd80709" call example 3 # given: synopsis call(\SHA, 'new'); # bless(do{\(my $o = '...')}, 'Digest::SHA') call example 4 # given: synopsis wrap 'Digest'; call(Digest('SHA'), 'reset'); # "da39a3ee5e6b4b0d3255bfef95601890afd80709" can can(Str | Object | CodeRef $self, Str $name) (CodeRef) The can function checks if the object or class has a routine matching the name provided, and if so returns a coderef for that routine. Since 0.02 can example 1 # given: synopsis my $coderef = can(SHA(1), 'sha1_hex'); # sub { ... } chain chain(Str | Object | CodeRef $self, Str | ArrayRef[Str] @args) (Any) The chain function chains function and method calls to a package (and return values) and returns the result. Since 0.01 chain example 1 # given: synopsis my $hex = chain(\SHA, 'new', 'sha1_hex'); # "d3aed913fdc7f277dddcbde47d50a8b5259cb4bc" chain example 2 # given: synopsis my $hex = chain(\SHA, 'new', ['add', 'hello'], 'sha1_hex'); # "f47b0cd4b6336d07ab117d7ee3f47566c9799f23" chain example 3 # given: synopsis wrap 'Digest'; my $hex = chain(Digest('SHA'), ['add', 'hello'], 'sha1_hex'); # "8575ce82b266fdb5bc98eb43488c3b420577c24c" error error(Str $message, Int $offset, Int $limit) (Any) The error function dies with the error message provided and prints a stacktrace. If $limit or $offset are provided, those options will constrain the output of the stacktrace. Since 0.04 error example 1 # given: synopsis error; # "Exception!" error example 2 # given: synopsis error('Exception!'); # "Exception!" error example 3 # given: synopsis error('Exception!', 0, 1); # "Exception!" false false() (Bool) The false function returns a falsy boolean value which is designed to be practically indistinguishable from the conventional numerical 0 value. Since 0.01 false example 1 package main; use Earth; my $false = false; # 0 false example 2 package main; use Earth; my $true = !false; # 1 make make(Str $package, Any @args) (Any) The make function "calls" the new routine on the invocant and returns the result which should be a package string or an object. Since 0.01 make example 1 # given: synopsis my $string = make(SHA); # bless(do{\(my $o = '...')}, 'Digest::SHA') make example 2 # given: synopsis my $string = make(Digest, 'SHA'); # bless(do{\(my $o = '...')}, 'Digest::SHA') roll roll(Str $name, Any @args) (Any) The roll function takes a list of arguments, assuming the first argument is invokable, and reorders the list such that the routine name provided comes after the invocant (i.e. the 1st argument), creating a list acceptable to the "call" function. Since 0.02 roll example 1 package main; use Earth; my @list = roll('sha1_hex', SHA); # ("Digest::SHA", "sha1_hex") roll example 2 package main; use Earth; my @list = roll('sha1_hex', call(SHA(1), 'reset')); # (bless(do{\(my $o = '...')}, 'Digest::SHA'), "sha1_hex") then then(Str | Object | CodeRef $self, Any @args) (Any) The then function proxies the call request to the "call" function and returns the result as a list, prepended with the invocant. Since 0.02 then example 1 package main; use Earth; my @list = then(SHA, 'sha1_hex'); # ("Digest::SHA", "da39a3ee5e6b4b0d3255bfef95601890afd80709") true true() (Bool) The true function returns a truthy boolean value which is designed to be practically indistinguishable from the conventional numerical 1 value. Since 0.01 true example 1 package main; use Earth; my $true = true; # 1 true example 2 package main; use Earth; my $false = !true; # 0 wrap wrap(Str $package, Str $alias) (CodeRef) The wrap function installs a wrapper function in the calling package which when called either returns the package string if no arguments are provided, or calls "make" on the package with whatever arguments are provided and returns the result. Unless an alias is provided as a second argument, special characters are stripped from the package to create the function name. Since 0.01 wrap example 1 # given: synopsis my $coderef = wrap('Digest::SHA'); # my $digest = DigestSHA(); # "Digest::SHA" wrap example 2 # given: synopsis my $coderef = wrap('Digest::SHA'); # my $digest = DigestSHA(1); # bless(do{\(my $o = '...')}, 'Digest::SHA') wrap example 3 # given: synopsis my $coderef = wrap('Digest::SHA', 'SHA'); # my $digest = SHA; # "Digest::SHA" wrap example 4 # given: synopsis my $coderef = wrap('Digest::SHA', 'SHA'); # my $digest = SHA(1); # bless(do{\(my $o = '...')}, 'Digest::SHA') AUTHORS Awncorp, awncorp@cpan.org