Pattern
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class Step is Method does Positional {
has $.name = "bla";
has Callable @.steps handles <AT-POS elems>;
method add-step(&callable) {
@!steps.push: &callable
}
method next-step(@pos) {
#say @pos;
my @data := self;
my @qtt;
for @pos -> $i {
@qtt.push: @data.elems;
try @data := @data[$i]
}
#say @qtt;
my @next = @pos;
for (@pos Z @qtt.map: * - 1).kv.reverse -> ($pos, $max), $i {
if $pos < $max {
@next[$i]++;
last
} else {
@next.splice: $i, 1
}
}
my $data := self;
for @next -> UInt $i {
$data := $data[$i];
}
for 0 xx Inf -> UInt $i {
last unless $data ~~ Positional;
@next.push: $i;
$data := $data[$i];
}
#say @next;
@next
}
method first-pos {
my $data := self;
my UInt @i;
for 0 xx Inf -> UInt $i {
@i.push: $i;
$data := $data[$i];
last unless $data ~~ Positional;
}
@i
}
method CALL-ME($match is copy) {
my @pos := $match.pos;
unless @pos {
$match .= clone: :pos(@pos := $.first-pos);
}
#say self[||@pos](match);
my $call = (self, |@pos).reduce: -> $data, UInt $i {
$data[$i]
}
$.next($match) if $call($match)
}
method next(\match) {
my @pos = match.pos;
self.(match.clone: :pos($.next-step: @pos))
}
}
class Event {
has UInt @.pos;
}
my $sub = Step.bless;
$sub.add-step: { say "1: {.gist}" }
my $step = Step.bless;
$step.add-step: $sub;
$step.add-step: { say "2: {.gist}"; False }
say $step(Event.new)
Raku
INFO