gambit-scheme
v0.0.0
Published
Gambit Scheme Runtime and Environment
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Gambit Scheme
The Gambit programming system is a full implementation of the Scheme language which conforms to the R4RS, R5RS and IEEE Scheme standards.
The gambit-scheme
UMD library allows many different uses of that runtime.
Installation
Easy! I choose yarn
, but npm
also works.
yarn add gambit-scheme
One probably wants to load .scm
files. For that gambit-loader
is one option.
yarn add gambit-loader --dev
Documentation
For details see the repo, man! https://github.com/drewc/gxjs
Usage
The package gambit-scheme
contains a minimal runtime generated by the Gambit
Scheme environment. It attempts to be small yet contain enough to develop and
application with the option to add and load Gambit modules.
To load a .scm
file, gambit-loader
is the easy way. The options are the same
as gxjs-loader
.
Here is gambit-scheme-usage.scm
.
(declare (extended-bindings))
(##inline-host-declaration "console.log('Started Gambit loaded file!')")
(define gambit-vector
(##vector
42 'this "is how we hake the moonshine"))
(define (this-is-gambit! #!optional (val 42))
(let ((three (##inline-host-expression "{ answer: 42 };")))
(##inline-host-statement "console.log('This is Gambit!', (@1@), (@2@), (@3@))"
val gambit-vector three)))
(##inline-host-statement "console.log('finished Gambit-loaded file');
module.exports = RTS.scm2host(@1@);" this-is-gambit!)
Now for a JavaScript file, gambit-scheme-usage.js
. We’ll make this a
CommonJS module.
We do not actually need to require('gambit-scheme')
here at all but the RTS
is exported pretty much so we can see just that.
const RTS = require('gambit-scheme');
const thisIsGambit = require('gambit-loader!./gambit-scheme-usage.scm');
thisIsGambit(0.42);
module.exports = RTS;
Running that outputs this.
Started Gambit loaded file!
finished Gambit-loaded file
This is Gambit! { val: 0.42 } [
42,
{ name: 'this', hash: 439079553, interned: true },
{
codes: [
105, 115, 32, 104, 111, 119, 32,
119, 101, 32, 104, 97, 107, 101,
32, 116, 104, 101, 32, 109, 111,
111, 110, 115, 104, 105, 110, 101
]
}
] { answer: 42 }
By default gambit-loader
automagically requires gambit-scheme
by prepending const RTS = require('gambit-scheme');
to the top of the “file”.
(declare (extended-bindings))
(##inline-host-statement #<<EOF
console.log('Ok, auto RTS!', Object.keys(RTS.glo).length)
module.exports = RTS;
EOF
)
const RTS = require('./gambit-scheme-usage.js');
const sameRTS = require('gambit-loader!./gambit-scheme-auto.scm');
console.log('Same Runtime?', RTS === sameRTS);
That outputs this:
Started Gambit loaded file!
finished Gambit-loaded file
This is Gambit! { val: 0.42 } [
42,
{ name: 'this', hash: 439079553, interned: true },
{
codes: [
105, 115, 32, 104, 111, 119, 32,
119, 101, 32, 104, 97, 107, 101,
32, 116, 104, 101, 32, 109, 111,
111, 110, 115, 104, 105, 110, 101
]
}
] { answer: 42 }
Ok, auto RTS! 127
Same Runtime? true
Support
Go to https://github.com/drewc/gxjs/issues or contact the author.