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Supply-factories.pm6
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Supply-factories.pm6
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# continued from src/core.c/Supply.pm6
## Supply factories
##
my class OnDemand does Tappable {
has &!producer;
has &!closing;
has $!scheduler;
submethod BUILD(:&!producer!, :&!closing!, :$!scheduler! --> Nil) {}
method tap(&emit, &done, &quit, &tap) {
my int $closed = 0;
my $t = Tap.new: {
if &!closing {
&!closing() unless $closed++;
}
}
tap($t);
my $p = Supplier.new;
$p.Supply.tap(&emit,
done => {
done();
$t.close();
},
quit => -> \ex {
quit(ex);
$t.close();
});
$!scheduler.cue({ &!producer($p) },
catch => -> \ex { $p.quit(ex) });
$t
}
method live(--> False) { }
method sane(--> False) { }
method serial(--> False) { }
}
method on-demand(Supply:U: &producer, :&closing, :$scheduler = CurrentThreadScheduler) {
Supply.new(OnDemand.new(:&producer, :&closing, :$scheduler)).sanitize
}
method from-list(Supply:U: +@values, :$scheduler = CurrentThreadScheduler) {
self.on-demand(-> $p {
$p.emit($_) for @values;
$p.done();
}, :$scheduler);
}
my class Interval does Tappable {
has $!scheduler;
has $!interval;
has $!delay;
submethod BUILD(:$!scheduler, :$!interval, :$!delay --> Nil) { }
method tap(&emit, &, &, &tap) {
my $i = 0;
my $lock = Lock::Async.new;
$lock.protect: {
my $cancellation = $!scheduler.cue(
{
$lock.protect: { emit $i++ };
CATCH { $cancellation.cancel if $cancellation }
},
:every($!interval), :in($!delay)
);
my $t = Tap.new({ $cancellation.cancel });
tap($t);
$t
}
}
method live(--> False) { }
method sane(--> True) { }
method serial(--> True) { }
}
method interval(Supply:U: $interval, $delay = 0, :$scheduler = $*SCHEDULER) {
Supply.new(Interval.new(:$interval, :$delay, :$scheduler));
}
##
## Simple operations are those that operate on a single Supply, carry its
## liveness, and are always serial. We implement the directly as they are
## common and fairly "hot path".
##
my role SimpleOpTappable does Tappable {
has $!source;
method live() { $!source.live }
method sane(--> True) { }
method serial(--> True) { }
method !cleanup(int $cleaned-up is rw, $source-tap) {
if $source-tap && !$cleaned-up {
$cleaned-up = 1;
$source-tap.close;
}
}
}
my class Serialize does SimpleOpTappable {
submethod BUILD(:$!source! --> Nil) { }
method tap(&emit, &done, &quit, &tap) {
my $lock = Lock::Async.new;
my int $cleaned-up = 0;
my $source-tap;
my $t;
$!source.tap(
tap => {
$source-tap = $_;
$t = Tap.new({ self!cleanup($cleaned-up, $source-tap) });
tap($t);
},
-> \value{
$lock.protect-or-queue-on-recursion: { emit(value); }
},
done => -> {
$lock.protect-or-queue-on-recursion: {
done();
self!cleanup($cleaned-up, $source-tap);
}
},
quit => -> $ex {
$lock.protect-or-queue-on-recursion: {
quit($ex);
self!cleanup($cleaned-up, $source-tap);
}
});
$t
}
}
method serialize(Supply:D:) {
$!tappable.serial ?? self !! Supply.new(Serialize.new(source => self))
}
my class Sanitize does SimpleOpTappable {
submethod BUILD(:$!source! --> Nil) { }
method tap(&emit, &done, &quit, &tap) {
my int $cleaned-up = 0;
my int $finished = 0;
my $source-tap;
my $t;
$!source.tap(
tap => {
$source-tap = $_;
$t = Tap.new({ self!cleanup($cleaned-up, $source-tap) });
tap($t);
},
-> \value{
emit(value) unless $finished;
},
done => -> {
unless $finished {
$finished = 1;
done();
self!cleanup($cleaned-up, $source-tap);
}
},
quit => -> $ex {
unless $finished {
$finished = 1;
quit($ex);
self!cleanup($cleaned-up, $source-tap);
}
});
$t
}
}
method sanitize() {
$!tappable.sane ?? self !! Supply.new(Sanitize.new(source => self.serialize))
}
my class OnClose does SimpleOpTappable {
has &!on-close;
submethod BUILD(:$!source!, :&!on-close! --> Nil) { }
method tap(&emit, &done, &quit, &tap) {
my int $cleaned-up = 0;
my $t;
$!source.tap: &emit, :&done, :&quit, tap => -> $source-tap {
$t = Tap.new({
&!on-close();
self!cleanup($cleaned-up, $source-tap)
});
tap($t);
}
$t
}
}
method on-close(Supply:D: &on-close) {
Supply.new(OnClose.new(source => self, :&on-close))
}
my class MapSupply does SimpleOpTappable {
has &!mapper;
submethod BUILD(:$!source!, :&!mapper! --> Nil) { }
method tap(&emit, &done, &quit, &tap) {
my int $cleaned-up = 0;
my $source-tap;
my $t;
$!source.tap(
tap => {
$source-tap = $_;
$t = Tap.new({ self!cleanup($cleaned-up, $source-tap) });
tap($t);
},
-> \value {
my \result = try &!mapper(value);
if $! {
quit($!);
self!cleanup($cleaned-up, $source-tap);
}
else {
emit(result)
}
},
done => -> {
done();
self!cleanup($cleaned-up, $source-tap);
},
quit => -> $ex {
quit($ex);
self!cleanup($cleaned-up, $source-tap);
});
$t
}
}
method map(Supply:D: &mapper) {
Supply.new(MapSupply.new(source => self.sanitize, :&mapper))
}
my class Grep does SimpleOpTappable {
has Mu $!test;
submethod BUILD(:$!source!, Mu :$!test! --> Nil) { }
method tap(&emit, &done, &quit, &tap) {
my int $cleaned-up = 0;
my $source-tap;
my $t;
$!source.tap(
tap => {
$source-tap = $_;
$t = Tap.new({ self!cleanup($cleaned-up, $source-tap) });
tap($t);
},
-> \value {
if try $!test.ACCEPTS(value) {
emit(value);
}
elsif $! {
quit($!);
self!cleanup($cleaned-up, $source-tap);
}
},
done => -> {
done();
self!cleanup($cleaned-up, $source-tap);
},
quit => -> $ex {
quit($ex);
self!cleanup($cleaned-up, $source-tap);
});
$t
}
}
method grep(Supply:D: Mu $test) {
Supply.new(Grep.new(source => self.sanitize, :$test))
}
method first(Supply:D: :$end, |c) {
c.list
?? $end
?? self.grep(|c).tail
!! self.grep(|c).head
!! $end
?? self.tail
!! self.head
}
my class ScheduleOn does SimpleOpTappable {
has $!scheduler;
submethod BUILD(:$!source!, :$!scheduler! --> Nil) { }
method tap(&emit, &done, &quit, &tap) {
my int $cleaned-up = 0;
my $source-tap;
my $t;
$!source.tap(
tap => {
$source-tap = $_;
$t = Tap.new({ self!cleanup($cleaned-up, $source-tap) });
tap($t);
},
-> \value {
$!scheduler.cue: { emit(value) }
},
done => -> {
$!scheduler.cue: { done(); self!cleanup($cleaned-up, $source-tap); }
},
quit => -> $ex {
$!scheduler.cue: { quit($ex); self!cleanup($cleaned-up, $source-tap); }
});
$t
}
}
method schedule-on(Supply:D: Scheduler $scheduler) {
Supply.new(ScheduleOn.new(source => self.sanitize, :$scheduler))
}
my class Start does SimpleOpTappable {
has $!value;
has &!startee;
submethod BUILD(:$!value, :&!startee --> Nil) { }
method tap(&emit, &done, &quit, &tap) {
my int $closed = 0;
my $t = Tap.new({ $closed = 1 });
tap($t);
Promise.start({ &!startee($!value) }).then({
unless $closed {
if .status == Kept {
emit(.result);
done();
}
else {
quit(.cause);
}
}
});
$t
}
}
method start(Supply:D: &startee) {
self.map: -> \value {
Supply.new(Start.new(:value(value), :&startee))
}
}
my class Stable does SimpleOpTappable {
has $!time;
has $!scheduler;
submethod BUILD(:$!source!, :$!time!, :$!scheduler! --> Nil) { }
method tap(&emit, &done, &quit, &tap) {
my int $cleaned-up = 0;
my $lock = Lock::Async.new;
my $last_cancellation;
my $source-tap;
my $t;
$!source.tap(
tap => {
$source-tap = $_;
$t = Tap.new({ self!cleanup($cleaned-up, $source-tap) });
tap($t);
},
-> \value {
$lock.protect: {
if $last_cancellation {
$last_cancellation.cancel;
}
$last_cancellation = $!scheduler.cue(
:in($!time),
{
$lock.protect: { $last_cancellation = Nil; }
try {
emit(value);
CATCH {
default {
quit($_);
self!cleanup($cleaned-up, $source-tap);
}
}
}
});
}
},
done => -> {
done();
self!cleanup($cleaned-up, $source-tap);
},
quit => -> $ex {
quit($ex);
self!cleanup($cleaned-up, $source-tap);
});
$t
}
}
method stable(Supply:D: $time, :$scheduler = $*SCHEDULER) {
$time
?? Supply.new(
Stable.new(source => self.sanitize, :$time, :$scheduler)
)
!! self
}
my class Delayed does SimpleOpTappable {
has $!time;
has $!scheduler;
submethod BUILD(:$!source!, :$!time, :$!scheduler! --> Nil) { }
method tap(&emit, &done, &quit, &tap) {
my int $cleaned-up = 0;
my $source-tap;
my $t;
$!source.tap(
tap => {
$source-tap = $_;
$t = Tap.new({ self!cleanup($cleaned-up, $source-tap) });
tap($t);
},
-> \value {
$!scheduler.cue: { emit(value) }, :in($!time)
},
done => -> {
$!scheduler.cue:
{ done(); self!cleanup($cleaned-up, $source-tap); },
:in($!time)
},
quit => -> $ex {
$!scheduler.cue:
{ quit($ex); self!cleanup($cleaned-up, $source-tap); },
:in($!time)
});
$t
}
}
method delayed(Supply:D: $time, :$scheduler = $*SCHEDULER) {
$time
?? Supply.new(Delayed.new(source => self.sanitize,:$time,:$scheduler))
!! self # nothing to do
}
##
## A bunch of the more complex combinators, implemented as supply blocks
##
method do(Supply:D: &side-effect) {
supply {
whenever self -> \value {
side-effect(value);
emit(value);
}
}
}
method flat(Supply:D:) {
supply {
whenever self -> \inner {
whenever inner -> \value {
emit value;
}
}
}
}
method merge(*@s) {
@s.unshift(self) if self.DEFINITE; # add if instance method
return supply { } unless +@s; # nothing to be done
X::Supply::Combinator.new(
combinator => 'merge'
).throw unless Rakudo::Internals.ALL_DEFINED_TYPE(@s,Supply);
return @s[0].sanitize if +@s == 1; # nothing to be done
supply {
for @s {
whenever $_ -> \value { emit(value) }
}
}
}
method reduce(Supply:D: &with) {
supply {
my $reduced := nqp::null;
whenever self -> \value {
$reduced := nqp::isnull($reduced)
?? value
!! with($reduced, value);
LAST {
emit nqp::ifnull($reduced,Nil);
}
}
}
}
method produce(Supply:D: &with) {
supply {
my $reduced := nqp::null;
whenever self -> \value {
emit $reduced := nqp::isnull($reduced)
?? value
!! with($reduced, value);
}
}
}
method migrate(Supply:D:) {
supply {
my $current;
whenever self -> \inner {
X::Supply::Migrate::Needs.new.throw
unless nqp::istype(inner, Supply);
$current.close if $current;
$current = do whenever inner -> \value {
emit(value);
}
}
}
}
proto method classify(|) {*}
multi method classify(Supply:D: &mapper ) {
self!classify(&mapper);
}
multi method classify(Supply:D: %mapper ) {
self!classify({ %mapper{$^a} });
}
multi method classify(Supply:D: @mapper ) {
self!classify({ @mapper[$^a] });
}
proto method categorize (|) {*}
multi method categorize(Supply:D: &mapper ) {
self!classify(&mapper, :multi);
}
multi method categorize(Supply:D: %mapper ) {
self!classify({ %mapper{$^a} }, :multi);
}
multi method categorize(Supply:D: @mapper ) {
self!classify({ @mapper[$^a] }, :multi);
}
method !classify(&mapper, :$multi) {
supply {
my %mapping;
sub find-target($key) {
%mapping{ $key.WHICH } //= do {
my $p = Supplier::Preserving.new;
emit($key => $p.Supply);
$p
};
}
whenever self -> \value {
if $multi {
for @(mapper(value)) -> $key {
find-target($key).emit(value);
}
}
else {
find-target(mapper(value)).emit(value);
}
LAST {
%mapping.values>>.done;
}
}
}
}
# comb the supply for characters
proto method comb(|) {*}
multi method comb(Supply:D:) {
supply {
whenever self -> str $str {
for ^nqp::chars($str) -> int $i {
emit nqp::box_s(nqp::substr($str,$i,1),Str);
}
}
}
}
# comb the supply for N characters at a time
multi method comb(Supply:D: Int:D $the-batch) {
$the-batch <= 1
?? self.comb
!! supply {
my str $str;
my int $batch = $the-batch;
whenever self -> str $val {
$str = nqp::concat($str,$val);
my int $i;
my int $times = nqp::chars($str) div $batch;
nqp::while(
$times--,
nqp::stmts(
emit(nqp::box_s(nqp::substr($str,$i,$batch),Str)),
($i = $i + $batch)
)
);
$str = nqp::substr($str,$i);
LAST { emit $str if nqp::chars($str) }
}
}
}
# comb the supply for a Str needle
multi method comb(Supply:D: Str:D $the-needle) {
$the-needle
?? supply {
my str $str;
my str $needle = $the-needle;
my int $len = nqp::chars($needle);
whenever self -> str $val {
$str = nqp::concat($str,$val);
my int $i;
my int $pos;
nqp::while(
nqp::isgt_i(($i = nqp::index($str,$needle,$pos)),-1),
nqp::stmts(
emit($the-needle),
($pos = $i + $len)
)
);
$str = nqp::substr($str,$pos);
}
}
!! self.comb
}
# Specifying :match forces a collect of all strings first
multi method comb(Supply:D: Regex:D $matcher, :$match!, |c) {
$match
?? supply {
my $parts := nqp::list_s;
whenever self -> str $val {
nqp::push_s($parts,$val);
LAST {
emit $_
for nqp::join('',$parts).comb($matcher, :match, |c);
}
}
}
!! self.comb($matcher, |c)
}
# comb the supply for a Regex needle
multi method comb(Supply:D: Regex:D $matcher) {
supply {
my str $str;
whenever self -> str $val {
$str = nqp::concat($str,$val);
my @matches = $str.comb($matcher, :match);
emit .Str for @matches;
$str = nqp::substr($str,@matches.tail.pos) if @matches;
}
}
}
# comb the supply for a Str needle for a max number of time
multi method comb(Supply:D: \the-thing, \the-limit) {
self.comb(the-thing).head(the-limit)
}
# split the supply on the needle and adverbs
multi method split(Supply:D: \needle) {
supply {
my $str = ""; # prevent warning on first batch
my @matches;
whenever self -> \value {
done unless @matches = ($str ~ value).split(needle, |%_);
$str = @matches.pop.Str; # keep last for next batch
emit .Str for @matches;
LAST { emit $str }
}
}
}
# split the supply on the needle, limit and adverbs
multi method split(Supply:D: \needle, \the-limit) {
self.split(needle, |%_).head(the-limit)
}
# encode chunks with the given encoding
method encode(Supply:D: $encoding = "utf8") {
supply {
whenever self -> \val {
emit val.encode($encoding);
}
}
}
# decode chunks with the given encoding
method decode(Supply:D: $encoding = "utf8") {
supply {
my str $str;
whenever self -> \val {
my str $decoded = nqp::concat($str,val.decode($encoding));
if nqp::chars($decoded) > 1 {
emit nqp::box_s(
nqp::substr($decoded,0,nqp::chars($decoded) - 1),
Str
);
$str = nqp::substr($decoded,nqp::chars($decoded) - 1);
}
else {
$str = $decoded;
}
LAST { emit nqp::box_s($str,Str) if nqp::chars($str) }
}
}
}
# continued in src/core.c/Supply-coercers.pm6
# vim: expandtab shiftwidth=4