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head

code

root

para

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


L<Download |file:../download/index.podlite>


React

=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


HEADER

FOOTER

README

item

nested

use v6.c;
unit class SeqSplitter:ver<0.0.1> does Sequence;



SeqSplitter - Creates `.pull-while`, `.pull-until`, `.pull`, `.skip-while`, `.skip-until` and `.skip` on `Seq` and `Any`.


=begin code :lang<raku>
use SeqSplitter;
say ^10
   .pull-while(* < 2)
   .skip-while(* < 5)
   .pull-until(7)
   .skip-until(8)
   .pull
   .skip(3)
;
=end code


=begin code :lang<raku>
(0 1 5 6 8)
=end code


SeqSplitter is a "better solution" for `.toggle` it was being discussed here https://github.com/rakudo/rakudo/issues/2089


Fernando Correa de Oliveira <fernandocorrea@gmail.com>


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



has Sequence    $.parent;
has Iterator:D  $.iterator is required;

class PrependedItemIterator does Iterator {
    has Mu          $.item;
    has Iterator:D  $.iter is required;
    has Bool        $!has-item = True;
    method pull-one {
        do if $!has-item {
            $!has-item = False;
            $!item
        } else {
            $!iter.pull-one
        }
    }
}

sub prepend-item(Iterator:D $iter, Mu \i) {
    #say "prepend-item: ", $iter, ", ", i.Str;
    PrependedItemIterator.new: :item(i), :$iter
}

role SplitedIterator does Iterator {
    multi method from-iterator(SplitedIterator $iter)   { $iter }
    multi method from-iterator(Iterator $iter)          { prepend-item($iter, IterationEnd) but SplitedIterator }
}

class ConditionalIterator does SplitedIterator {
    has Sequence            $.orig-seq  is required;
    has                     $.condition;
    has Bool                $.on;
    has SplitedIterator     $!original;
    has SplitedIterator     $!handling;
    has SplitedIterator     $!unhandled;


    method pull-one {
        my $item := IterationEnd;
        if not $!original.defined and not $!handling.defined and $!unhandled.defined {
            $item := $!unhandled.pull-one;
            #note "unhandled {$item.Str}";
        }
        #note "post unhandled";
        with $!orig-seq {
            #note "orig-seq";
            $!original = ::?CLASS.from-iterator: $!orig-seq.iterator;
            $!orig-seq = Nil
        }
        #note "post orig-seq";
        with $!original {
            $item := .pull-one;
            #note "original {$item.Str}";
            if $item =:= IterationEnd {
                $!handling = $!original;
                $!original = Nil
            }
        }
        #note "post original";
        with $!handling {
            my Bool $has-last-value = False;
            my $last-value;
            if $!on {
                $item := .pull-one;
                #note "     ---> on : {$item.Str}";
                if $item !=:= IterationEnd and $item !~~ $!condition {
                    $last-value     = $item;
                    $has-last-value = True;
                    $item := IterationEnd
                }
            } else {
                repeat {
                    $item := .pull-one;
                    #note "     ---> off: {$item.Str}";
                    last if $item =:= IterationEnd;
                    if $item !~~ $!condition {
                        $last-value     = $item;
                        $has-last-value = True;
                        last
                    }
                } while $item !=:= IterationEnd;
                $item := IterationEnd;
            }
            if $has-last-value {
                #note "has-last-value";
                $!unhandled     = prepend-item($!handling, $last-value) but SplitedIterator;
                $!handling      = Nil;
                $has-last-value = False;
            }
            #note "handling {$item.Str}";
        }
        #note "post handling";
        #note "item: ", $item.Str;
        $item
    }
}

method new(Sequence:D $orig-seq, $condition = True, Bool :$on = True, Sequence :$parent) {
    ::?CLASS.bless: :$parent, iterator => ConditionalIterator.new(:$orig-seq, :$condition, :$on)
}

method pull-while($condition) {
    ::?CLASS.new: (self.?parent // self), $condition, :on
}

method pull-until($condition) {
    ::?CLASS.new: (self.?parent // self), * !~~ $condition, :on
}

method skip-while($condition) {
    my $parent = ::?CLASS.new: (self.?parent // self), $condition, :!on;
    my \seq = $parent.pull-while: True;
    seq.^attributes.first('$!parent').set_value: seq, $parent;
    seq
}

method skip-until($condition) {
    my $parent = ::?CLASS.new: (self.?parent // self), * !~~ $condition, :!on;
    my \seq = $parent.pull-while: True;
    seq.^attributes.first('$!parent').set_value: seq, $parent;
    seq
}

proto method skip($?) {*}
multi method skip(Whatever)         { self.skip-while: True }
multi method skip(UInt() $n = 1)    { self.skip-until: { $++ == $n } }

proto method pull($?) {*}
multi method pull(Whatever) { self.pull-while: True }
multi method pull(UInt() $n = 1) { self.pull-until: { $++ == $n } }

use MONKEY-TYPING;
augment class Seq {
    method pull-while($condition) { SeqSplitter.new(self, :!on, False).pull-while: $condition }
    method pull-until($condition) { SeqSplitter.new(self, :!on, False).pull-until: $condition }
    method skip-while($condition) { SeqSplitter.new(self, :!on, False).skip-while: $condition }
    method skip-until($condition) { SeqSplitter.new(self, :!on, False).skip-until: $condition }
    method pull($n = 1)           { SeqSplitter.new(self, :!on, False).pull: $n }
}
augment class Any {
    method pull-while($condition) { self.Seq.pull-while: $condition }
    method pull-until($condition) { self.Seq.pull-until: $condition }
    method skip-while($condition) { self.Seq.skip-while: $condition }
    method skip-until($condition) { self.Seq.skip-until: $condition }
    method pull($n = 1)           { self.Seq.pull: $n }
}
(Range)>>.^compose;


SeqSplitter

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


=begin React :component<CookieConsent> :id<CookieConsent> :buttonCaption("Got it!")
=para
This website uses cookies for analytics.
=end React


README

NAME

SYNOPSIS

DESCRIPTION

AUTHOR

COPYRIGHT AND LICENSE

SeqSplitter v0.0.1

Authors

License

Dependencies

Test Dependencies

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Documentation