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L<Examples| file:../examples/index.podlite>


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=begin React :component<HeaderCol> :id<menu> 
=para L<Documentation|/doc/introduction>
=para L<Modules| /mods>
=para L<Examples| file:../examples/index.podlite>
=para L<Download |file:../download/index.podlite>
=para L<About|file:../about/index.podlite>
=para 🔍 K<⌘K>/K<ctrl-K>
=end React


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README

use v6.d;

module Sub::Memoized:ver<0.0.5>:auth<zef:lizmat> {

    # Create the identification string for the capture to serve as key
    my sub fingerprint(Capture:D $capture --> Str:D) {
        my str @parts = $capture.list.map: *<>.WHICH.Str;
        @parts.push('|');  # don't allow positionals to bleed into nameds
        for $capture.hash -> $pair {
            @parts.push( $pair.key );  # key is always a string with nameds
            @parts.push( $pair.value<>.WHICH.Str );
        }
        @parts.join('|')
    }

    # Perform the actual wrapping of the sub to have it memoized
    my sub memoize(\r, \cache --> Nil) {
        r.wrap(-> |c {
            my $key := fingerprint(c);
            cache.EXISTS-KEY($key)
              ?? cache.AT-KEY($key)
              !! cache.BIND-KEY($key,callsame);
        });
    }

    # Handle the "is memoized" / is memoized(Bool:D) cases
    multi sub trait_mod:<is>(Sub:D \r, Bool:D :$memoized! --> Nil) is export {
        if $memoized {
            my $name = r.^name;
            memoize(r, {});
            r.WHAT.^set_name("$name\(memoized)");
        }
    }

    # Handle the "is memoized(my %h)" case
    multi sub trait_mod:<is>(Sub:D \r, Hash:D :$memoized! --> Nil) is export {
        my $name = r.^name;
        memoize(r, $memoized<>);
        r.WHAT.^set_name("$name\(memoized)");
    }
}



Sub::Memoized - trait for memoizing calls to subroutines


sub a($a,$b) is memoized {
    # do some expensive calculation
}


sub b($a, $b) is memoized( my %cache ) {
    # do some expensive calculation with direct access to cache
}


use Hash::LRU;
sub c($a, $b) is memoized( my %cache is LRU( elements => 2048 ) ) {
    # do some expensive calculation, keep last 2048 results returned
}


Sub::Memoized provides a C<is memoized> trait on C<Sub>routines as an easy
way to cache calculations made by that subroutine (assuming a given set of
input parameters will always produce the same result).


Optionally, you can specify a hash that will serve as the cache.  This
allows later access to the generated results.  Or you can specify a specially
crafted hash, such as one made with C<Hash::LRU>.


Source can be located at: https://github.com/lizmat/Sub-Memoized . Comments and
Pull Requests are welcome.


This library is free software; you can redistribute it and/or modify it under
the Artistic License 2.0.


Memoized

# Since this distribution is about providing optimized functionality
# that can also be achieved by using regular expressions, it was decided
# to use NQP in here.  All of these subroutines could easily be rewritten
# in pure Raku if necessary, should that be needed for Raku implementations
# that are not based on NQP.
use nqp;

my sub between(str $string, str $before, str $after) is export {
    nqp::if(
      nqp::iseq_i((my int $left = nqp::index($string,$before)),-1),
      Nil,
      nqp::if(
        nqp::iseq_i((my int $right = nqp::index($string,$after,$left)),-1),
        Nil,
        nqp::stmts(
          (my int $offset = $left + nqp::chars($before)),
          nqp::substr($string,$offset,nqp::sub_i($right,$offset))
        )
      )
    )
}

my sub before(str $string, str $before) is export {
    nqp::iseq_i((my int $left = nqp::index($string,$before)),-1)
      ?? Nil
      !! nqp::substr($string,0,$left)
}

my sub after(str $string, str $after) is export {
    nqp::iseq_i((my int $right = nqp::index($string,$after)),-1)
      ?? Nil
      !! nqp::substr($string,nqp::add_i($right,nqp::chars($after)))
}



String::Utils - Provide some optimized string functions


=begin code :lang<raku>

use String::Utils;

say before("foobar","bar");            # foo

say between("foobarbaz","foo","baz");  # bar

say after("foobar","foo");             # bar

=end code


String::Utils provides some simple string functions that are not (yet)
provided by the core Raku Programming Language.


=begin code :lang<raku>

say after("foobar","foo");   # bar

say "foobar".&after("foo");  # bar

say after("foobar","goo");   # Nil

=end code


Return the string B<after> a given string, or C<Nil> if the given string could
not be found.  The equivalent of the stringification of C</ <?after foo> .* />.


=begin code :lang<raku>

say before("foobar","bar");   # foo

say "foobar".&before("bar");  # foo

say before("foobar","baz");   # Nil

=end code


Return the string B<before> a given string, or C<Nil> if the given string could
not be found.  The equivalent of the stringification of
C</ .*? <?before bar> />.


=begin code :lang<raku>

say between("foobarbaz","foo","baz");   # bar

say "foobarbaz".&between("foo","baz");  # bar

say between("foobarbaz","goo","baz");   # Nil

=end code


Return the string B<between> two given strings, or C<Nil> if either of the
bounding strings could not be found.  The equivalent of the stringification of
C</ <?after foo> .*? <?before baz> />.


Source can be located at: https://github.com/lizmat/String-Utils . Comments and
Pull Requests are welcome.


This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.


Utils

The Raku Knowledge Base


=begin React :component<HeaderCol> :id<footer>  
=begin nested :!nested
=item1 B<Language>
    =item2 L<Get started|file:../getting-started/getting-started.podlite>
    =item2 L<Why Raku?|/doc/language/faq#Why-should-I-learn-Raku-What's-so-great-about-it>
    =item2 L<Try Raku|https://glot.io/new/raku>
    =item2 L<Raku cheat sheet|https://github.com/Raku/mu/blob/master/docs/Perl6/Cheatsheet/cheatsheet.txt>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<Raku on Exercism|https://exercism.org/tracks/raku>
    =item2 L<Wikipedia|https://en.wikipedia.org/wiki/Raku_(programming_language)>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=begin nested :!nested

=item1 B<L<Documentation|/doc>>
    =item2 L<Getting started, Migration guides from other languages, & Tutorials | file:../doc/introduction.podlite>
    =item2 L<Language References|file:../doc/reference.podlite>
    =item2 L<Type Reference| file:../doc/types.podlite>
    =item2 L<Miscellaneous| file:../doc/miscellaneous.podlite>
    =item2 L<FAQs (Frequently Asked Questions)|/doc/language/faq>
    =item2 L<Community|/doc/language/community>
    =item2 L<The list of all documents|file:../doc/index.podlite>

=item1 B<Resources>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>

=end nested
=begin nested :!nested

=item1 B<Resoures>
    =item2 L<Download | file:../download/index.podlite>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=item1 B<Learning>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Wikibook |https://en.wikibooks.org/wiki/Raku_Programming>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>
    =item2 L<Learn Raku in Y minutes|https://learnxinyminutes.com/docs/raku/>
    =item2 L<Golfing |https://github.com/AlexDaniel/raku-golf-cheatsheet>
=end nested
=begin nested :!nested

=item1 B<Explore>
    =item2 L<Raku Blog Aggregator|https://planet.raku.org/>
    =item2 L<Rakudo Weekly|https://rakudoweekly.blog/>
    =item2 L<The Weekly Challenge |https://perlweeklychallenge.org/>
    =item2 L<Raku Advent Calendar|https://raku-advent.blog/>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=end React


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=para
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README

NAME

SYNOPSIS

DESCRIPTION

SUBROUTINES

after

before

between

AUTHOR

COPYRIGHT AND LICENSE

String::Utils v0.0.1

Authors

License

Dependencies

Test Dependencies

Provides

Documentation