Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: priv-role-attrs
Fetching contributors…

Cannot retrieve contributors at this time

223 lines (200 sloc) 5.811 kb
my Int $UINT64_UPPER = nqp::pow_I(2, 64, Num, Int);
my role Rational is Real {
has Int $.numerator;
has Int $.denominator;
multi method WHICH(Rational:D:) {
nqp::box_s(
nqp::concat_s(
nqp::concat_s(nqp::unbox_s(self.^name), '|'),
nqp::concat_s(
nqp::tostr_I($!numerator),
nqp::concat_s('/', nqp::tostr_I($!denominator))
)
),
ObjAt
);
}
method new(Int \$nu = 0, Int \$de = 1) {
my $new := nqp::create(self);
my Int $gcd := $nu gcd $de;
my $numerator = $nu div $gcd;
my $denominator = $de div $gcd;
if $denominator < 0 {
$numerator = -$numerator;
$denominator = -$denominator;
}
nqp::bindattr($new, self.WHAT, '$!numerator', nqp::p6decont($numerator));
nqp::bindattr($new, self.WHAT, '$!denominator', nqp::p6decont($denominator));
$new;
}
method nude() { $!numerator, $!denominator }
method Num() {
$!denominator == 0
?? ($!numerator < 0 ?? -$Inf !! $Inf)
!! nqp::p6box_n(nqp::div_In(
nqp::p6decont($!numerator),
nqp::p6decont($!denominator)
));
}
method Int() { $!numerator div $!denominator }
method Bridge() { self.Num }
multi method Str(Rational:D:) {
self.Num.Str
}
method succ {
self.new($!numerator + $!denominator, $!denominator);
}
method pred {
self.new($!numerator - $!denominator, $!denominator);
}
}
# XXX: should also be Cool
my class Rat does Rational {
method Rat (Rat:D: Real $?) { self }
method FatRat(Rat:D: Real $?) { FatRat.new($.numerator, $.denominator); }
multi method perl(Rat:D:) {
$.numerator ~ '/' ~ $.denominator
}
}
my class FatRat does Rational {
method FatRat(FatRat:D: Real $?) { self }
method Rat (FatRat:D: Real $?) {
$.denominator < $UINT64_UPPER
?? Rat.new($.numerator, $.denominator)
!! fail "Cannot convert from FatRat to Rat because denominator is too big";
}
multi method perl(FatRat:D:) {
"FatRat.new($.numerator, $.denominator)";
}
}
sub DIVIDE_NUMBERS(Int:D \$nu, Int:D \$de, $t1, $t2) {
my Int $gcd := $nu gcd $de;
my Int $numerator = $nu div $gcd;
my Int $denominator = $de div $gcd;
if $denominator < 0 {
$numerator = -$numerator;
$denominator = -$denominator;
}
if nqp::istype($t1, FatRat) || nqp::istype($t2, FatRat) {
my $r := nqp::create(FatRat);
nqp::bindattr($r, FatRat, '$!numerator', nqp::p6decont($numerator));
nqp::bindattr($r, FatRat, '$!denominator', nqp::p6decont($denominator));
$r;
} elsif $denominator < $UINT64_UPPER {
my $r := nqp::create(Rat);
nqp::bindattr($r, Rat, '$!numerator', nqp::p6decont($numerator));
nqp::bindattr($r, Rat, '$!denominator', nqp::p6decont($denominator));
$r;
} else {
nqp::p6box_n(nqp::div_In(
nqp::p6decont($numerator),
nqp::p6decont($denominator)
)
);
}
}
multi prefix:<->(Rat \$a) {
Rat.new(-$a.numerator, $a.denominator);
}
multi prefix:<->(FatRat \$a) {
FatRat.new(-$a.numerator, $a.denominator);
}
multi infix:<+>(Rational \$a, Rational \$b) {
my Int $gcd := $a.denominator gcd $b.denominator;
DIVIDE_NUMBERS(
($a.numerator * ($b.denominator div $gcd) + $b.numerator * ($a.denominator div $gcd)),
(($a.denominator div $gcd) * $b.denominator),
$a,
$b,
);
}
multi sub infix:<+>(Rational \$a, Int \$b) {
DIVIDE_NUMBERS(
($a.numerator + $b * $a.denominator),
$a.denominator,
$a,
$b,
);
}
multi sub infix:<+>(Int \$a, Rational \$b) {
DIVIDE_NUMBERS(
($a * $b.denominator + $b.numerator),
$b.denominator,
$a,
$b,
);
}
multi sub infix:<->(Rational \$a, Rational \$b) {
my Int $gcd = $a.denominator gcd $b.denominator;
DIVIDE_NUMBERS
$a.numerator * ($b.denominator div $gcd) - $b.numerator * ($a.denominator div $gcd),
($a.denominator div $gcd) * $b.denominator,
$a,
$b;
}
multi sub infix:<->(Rational \$a, Int \$b) {
DIVIDE_NUMBERS
$a.numerator - $b * $a.denominator,
$a.denominator,
$a,
$b;
}
multi sub infix:<->(Int \$a, Rational \$b) {
DIVIDE_NUMBERS
$a * $b.denominator - $b.numerator,
$b.denominator,
$a,
$b;
}
multi sub infix:<*>(Rational \$a, Rational \$b) {
DIVIDE_NUMBERS
$a.numerator * $b.numerator,
$a.denominator * $b.denominator,
$a,
$b;
}
multi sub infix:<*>(Rational \$a, Int \$b) {
DIVIDE_NUMBERS
$a.numerator * $b,
$a.denominator,
$a,
$b;
}
multi sub infix:<*>(Int \$a, Rational \$b) {
DIVIDE_NUMBERS
$a * $b.numerator,
$b.denominator,
$a,
$b;
}
multi sub infix:</>(Rational \$a, Rational \$b) {
DIVIDE_NUMBERS
$a.numerator * $b.denominator,
$a.denominator * $b.numerator,
$a,
$b;
}
multi sub infix:</>(Rational \$a, Int \$b) {
DIVIDE_NUMBERS
$a.numerator,
$a.denominator * $b,
$a,
$b;
}
multi sub infix:</>(Int \$a, Rational \$b) {
DIVIDE_NUMBERS
$b.denominator * $a,
$b.numerator,
$a,
$b;
}
multi sub infix:</>(Int \$a, Int \$b) {
DIVIDE_NUMBERS $a, $b, $a, $b
}
multi sub infix:<**>(Rational \$a, Int \$b) {
DIVIDE_NUMBERS
$a.numerator ** $b,
$a.denominator ** $b,
$a,
$b;
}
Jump to Line
Something went wrong with that request. Please try again.