Inline::Scheme::Gambit
This is a Raku module which allows execution of Gambit Scheme code from
Raku code with inspiration from other Inline:: modules like
Inline::Python, Inline::Lua, Inline::Scheme::Guile, etc.
Synopsis
use Inline::Scheme::Gambit;
my $gambit = Inline::Scheme::Gambit.new;
my $code = q:to/END/;
(define (fib n)
(if (< n 2) n (+ (fib (- n 1)) (fib (- n 2)))))
END
$gambit.run($code);
say $gambit.call('fib', 8);
say $gambit.call('map',
$gambit.run(q{(lambda (n) (fib n))}),
[0 .. 8]);
Status
Testing has only been done under Rakudo MoarVM on x86-64 Linux. It requires
Gambit-C 4, and Gambit-C 4.8.3 and 4.2.8 have been tested by the author.
Values can be passed to and returned from Gambit-C. Simple types
like boolean, integer, number, string, list, table, vector should
work. Present mapping between Gambit-C and Raku types is as
following table.
Gambit-C from Perl to Perl
boolean Bool Bool
integer(exact) Int Int
rational(exact) Rat Rat
rational(inexact) Num Num
complex Complex Complex
string Stringy Str
list Positional Array
table Associative Hash
vector Array
procedure OpaquePointer
other objects OpaquePointer OpaquePointer
Note that at present both scheme list and vector converts to Array
in Raku, but through the call() method (see below) Raku Array only
converts to list.
The API is incomplete and experimental. It may change in future if
necessary.
To Do
- Think about wrapping OpaquePointer for scheme-object, so that it can
do better on scheme list/vector/procedure/etc.
- Support scheme record type.
- Improve error handling.
Install
zef install Inline::Scheme::Gambit
It by default tries to use 'gsc-script' or 'gsc' as the gsc command,
and dynamically link to libgambc.so. It supports several environment
variables to override the default behavior.
For example to override gsc in case 'gsc-script' or 'gsc' is not in
PATH, or 'gsc-script' is an incorrect symlink.
GSC=/usr/bin/gsc zef install Inline::Scheme::Gambit
And if on your system gambit dll is not named libgambc.so, you can override
it like below,
LIBS="-l:libgambit.so.4" zef install Inline::Scheme::Gambit
Or if you would like to static link to some libgambit.a
LIBS=-lutil MYEXTLIB=/usr/lib/gambit-c/libgambit.a zef install Inline::Scheme::Gambit
You can refer to Makefile.in and Build.pm to know more details.
Usage
Inline::Scheme::Gambit
Object of Inline::Scheme::Gambit represents a global Gambit-C instance.
method new()
Returns the global Inline::Scheme::Gambit singleton. The first call to
new() initializes the singleton.
method run(Str:D $code)
Runs $code and returns any resulting value.
method call(Str:D $name, **@args)
Calls the named function with @args, and returns any resulting value.
https://github.com/iynehz/perl6-Inline-Scheme-Gambit