On 2/3/19 7:20 AM, Brad Gilbert wrote:
The Rakudo Perl6 compilier is written in Perl6 (and a subset of Perl6 named NQP)
The `index` subroutines are at
https://github.com/rakudo/rakudo/blob/64c88f919841c58f5a6dffd3581770e06a8fd6a5/src/core/Cool.pm6#L276-L282
proto sub index($, $, $?, *%) {*}
multi sub index(Cool $s, Cool $needle --> Int:D) {
$s.index($needle)
}
multi sub index(Cool $s, Cool $needle, Cool $pos --> Int:D) {
$s.index($needle,$pos)
}
They basically only call the `index` and `rindex` methods
To keep from showing you all of the methods, they all coerce the value
to Str then call `index` on that.
The location of the Str.index methods is
https://github.com/rakudo/rakudo/blob/3d581c8d23e0b47fd09616a1165f84568531a4aa/src/core/Str.pm6#L255-L284
proto method index(|) {*}
multi method index(Str:D: Cool:D $needle --> Int:D) {
self.index: $needle.Str
}
multi method index(Str:D: Str:D $needle --> Int:D) {
nqp::if(
nqp::islt_i((my int $i =
nqp::index($!value,nqp::getattr($needle,Str,'$!value'))),
0
),
Nil,
nqp::p6box_i($i)
)
}
multi method index(Str:D: Cool:D $needle, Cool:D $pos --> Int:D) {
self.index: $needle.Str, $pos.Int
}
multi method index(Str:D: Str:D $needle, Int:D $pos --> Int:D) {
nqp::if(
nqp::isbig_I(nqp::decont($pos)) || nqp::islt_i($pos,0),
self!INDEX-OOR($pos),
nqp::if(
nqp::islt_i((my int $i = nqp::index(
$!value,nqp::getattr($needle,Str,'$!value'),$pos
)),0),
Nil,
nqp::p6box_i($i)
)
)
}
Note that they heavily use NQP opcodes, so you shouldn't try and copy them.
On Sun, Feb 3, 2019 at 12:35 AM ToddAndMargo via perl6-users
<perl6-us...@perl.org> wrote:
Hi All,
Was the subroutine "index" written Perl6? If so,
where can I view the source code?
Many thanks,
-T
Thank you!
The nqp op codes do seem way over my head. :'(
