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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>
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item

use nqp;  # intended to be part of Raku core

my class Snip does Iterator {
    has $!tests;
    has $!iterator;
    has $!next;

    method !SET-SELF(@tests, $iterator) {
        $!tests    := nqp::getattr(@tests,List,'$!reified');
        $!iterator := $iterator;
        $!next     := $iterator.pull-one;
        self
    }

    method new(@tests, $iterator) {
        nqp::create(self)!SET-SELF(@tests, $iterator)
    }

    method pull-one() {
        if nqp::eqaddr($!next,IterationEnd) {
            IterationEnd
        }
        else {
            my $buffer := nqp::create(IterationBuffer);
            nqp::push($buffer,$!next);

            my $iterator := $!iterator;
            my $pulled;

            if nqp::elems($!tests) {
                my $test := nqp::shift($!tests);
                nqp::until(
                  nqp::eqaddr(($pulled := $iterator.pull-one),IterationEnd)
                    || nqp::isfalse($test.ACCEPTS($pulled)),
                  nqp::push($buffer,$pulled)
                );

            }
            else {
                nqp::until(
                  nqp::eqaddr(($pulled := $iterator.pull-one),IterationEnd),
                  nqp::push($buffer,$pulled)
                );
            }

            $!next := $pulled;
            $buffer.List
        }
    }
}

my proto sub snip($, |) {*}
my multi sub snip(\condition,  +values) {
    Seq.new: Snip.new: (condition,), values.iterator
}
my multi sub snip(@conditions, +values) {
    Seq.new: Snip.new: @conditions, values.iterator
}

sub EXPORT() {
    CORE::.EXISTS-KEY('&snip')
      ?? Map.new
      !! Map.new: ('&snip' => &snip)
}



snip - Provide functionality similar to Haskell's span


=begin code :lang<raku>

use snip;

.say for snip * < 10, 2, 2, 2, 5, 5, 7, 13, 9, 6, 2, 20, 4;
# (2 2 2 5 5 7)
# (13 9 6 2 20 4)

.say for snip (* < 10, * < 20), 2, 2, 2, 5, 5, 7, 13, 9, 6, 2, 20, 4;
# (2 2 2 5 5 7)
# (13 9 6 2)
# (20 4)

.say for snip Int, 2, 2, 2, 5, 5, "a", "b", "c";
# (2 2 2 5 5)
# (a b c)

=end code


The C<snip> distribution exports a single subroutine C<snip> that mimics
the functionality provided by L<Haskell's span functionality|https://hackage.haskell.org/package/base-4.16.1.0/docs/Prelude.html#v:snip>.
But only if the core does not supply a C<snip> subroutine already (which
it may at some point in the future).


The C<snip> subroutine takes a matcher much like C<grep> does, which can
be a C<Callable> or any other object that can have the C<ACCEPTS> method
called on it.  Different from the Haskell's C<span> implementation,
C<snip> can take multiple matchers to snip the origin list in more than
2 parts.


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


If you like this module, or what I’m doing more generally, committing to a
L<small sponsorship|https://github.com/sponsors/lizmat/>  would mean a great
deal to me!


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


snip

The Raku Knowledge Base


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=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|#>
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    =item2 L<Wikipedia|https://en.wikipedia.org/wiki/Raku_(programming_language)>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

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    =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
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    =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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README

NAME

SYNOPSIS

DESCRIPTION

AUTHOR

COPYRIGHT AND LICENSE

snip v0.0.1

Authors

License

Dependencies

Test Dependencies

Provides

Documentation