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/game.wasm
/game.zip
public

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modules = \
modules/dom/canvas.scm \
modules/dom/document.scm \
modules/dom/element.scm \
modules/dom/event.scm \
modules/dom/image.scm \
modules/dom/media.scm \
modules/dom/window.scm \
modules/math.scm \
modules/math/rect.scm \
modules/math/vector.scm
game.wasm: game.scm $(modules)
guild compile-wasm -L modules -o $@ $<
serve: game.wasm
guile -c '((@ (hoot web-server) serve))'
build: game.wasm
rm -rf public || true
mkdir public
cp reflect.js reflect.wasm game.js game.css game.wasm wtf8.wasm index.html public
publish: build
npx wrangler pages deploy public --project-name autumn-lisp-game-jam-2024
bundle: game.wasm
rm game.zip || true
zip game.zip -r reflect.js reflect.wasm game.js game.css game.wasm wtf8.wasm index.html
clean:
rm -f game.wasm game.zip public

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# Guile Hoot Game Jam Template
This repository is the quickest way to get started building games in
Scheme that run in web browsers with Guile Hoot!
It has everything you need:
* A simple Breakout clone to use as a starting point.
* HTML and JavaScript boilerplate for running the game in a web page.
* DOM bindings for events, images, audio, and more.
* HTML5 canvas bindings for rendering.
* Some simple but useful game math modules.
* A `Makefile` for compiling the game to WebAssembly, running a
development web server, and generating zip bundles for publishing to
itch.io.
* A Guix `manifest.scm` file for creating a development environment
with `guix shell`.
## Tutorial
The fastest way to get everything you need is to use [GNU
Guix](https://guix.gnu.org), a wonderful package manager written in
Scheme.
Once you have Guix, the development environment with all necessary
dependencies can be created:
```
guix shell
```
To build the game, run:
```
make
```
To launch a development web server, run:
```
make serve
```
To check if the program works, visit https://localhost:8088 in your
web browser. We recommend using Mozilla Firefox or Google Chrome.
Hoot is not supported on Safari at this time.
When it's time to publish the game to itch.io, run:
```
make bundle
```
Upload the resulting zip file to your itch.io game page and share your
game with others! Have fun!
## Getting help
If you have questions or need some help, visit the [Spritely
Institute's forum](https://community.spritely.institute/) or connect
to the `#spritely` channel on the Libera.Chat IRC network.

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body {
/* background-color: #000; */
margin: 0;
width: 100vw;
height: 100vh;
}
canvas {
display: block;
margin: 0 auto;
}

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window.addEventListener("load", async () => {
try {
await Scheme.load_main("game.wasm", {
user_imports: {
window: {
get: () => window,
innerWidth: () => window.innerWidth,
innerHeight: () => window.innerHeight,
requestAnimationFrame: (f) => window.requestAnimationFrame(f),
setTimeout: (f, delay) => window.setTimeout(f, delay)
},
document: {
get: () => document,
body: () => document.body,
getElementById: (id) => document.getElementById(id),
createTextNode: (text) => document.createTextNode(text),
createElement: (tag) => document.createElement(tag)
},
element: {
value: (elem) => elem.value,
setValue: (elem, value) => elem.value = value,
width: (elem) => elem.width,
height: (elem) => elem.height,
setWidth: (elem, width) => elem.width = width,
setHeight: (elem, height) => elem.height = height,
appendChild: (parent, child) => parent.appendChild(child),
setAttribute: (elem, name, value) => elem.setAttribute(name, value),
removeAttribute: (elem, name) => elem.removeAttribute(name),
remove: (elem) => elem.remove(),
replaceWith: (oldElem, newElem) => oldElem.replaceWith(newElem),
clone: (elem) => elem.cloneNode()
},
event: {
addEventListener: (target, type, listener) => target.addEventListener(type, listener),
removeEventListener: (target, type, listener) => target.removeEventListener(type, listener),
preventDefault: (event) => event.preventDefault(),
keyboardCode: (event) => event.code
},
image: {
new: (src) => {
const img = new Image();
img.src = src;
return img;
}
},
media: {
newAudio: (src) => new Audio(src),
play: (media) => media.play(),
pause: (media) => media.pause(),
volume: (media) => media.volume,
setVolume: (media, volume) => media.volume = volume,
setLoop: (media, loop) => media.loop = (loop == 1),
seek: (media, time) => media.currentTime = time
},
canvas: {
getContext: (elem, type) => elem.getContext(type),
setFillColor: (ctx, color) => ctx.fillStyle = color,
setFont: (ctx, font) => ctx.font = font,
setTextAlign: (ctx, align) => ctx.textAlign = align,
clearRect: (ctx, x, y, w, h) => ctx.clearRect(x, y, w, h),
fillRect: (ctx, x, y, w, h) => ctx.fillRect(x, y, w, h),
fillText: (ctx, text, x, y) => ctx.fillText(text, x, y),
drawImage: (ctx, image, sx, sy, sw, sh, dx, dy, dw, dh) => ctx.drawImage(image, sx, sy, sw, sh, dx, dy, dw, dh),
setScale: (ctx, sx, sy) => ctx.scale(sx, sy),
setTransform: (ctx, a, b, c, d, e, f) => ctx.setTransform(a, b, c, d, e, f),
setImageSmoothingEnabled: (ctx, enabled) => ctx.imageSmoothingEnabled = (enabled == 1)
},
math: {
random: () => Math.random()
}
}
});
} catch(e) {
if(e instanceof WebAssembly.CompileError) {
document.getElementById("wasm-error").hidden = false;
}
throw e;
}
});

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; Example game showing off several common game programming things.
;;;
;;; Code:
(use-modules (dom document)
(dom element)
(math vector)
(hoot ffi)
(hoot hashtables)
(ice-9 match))
(append-child! (document-body) (make-text-node "Hello, world!"))

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<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="reflect.js"></script>
<script type="text/javascript" src="game.js"></script>
<link rel="stylesheet" href="game.css" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<p id="wasm-error" hidden="true">
A browser with Wasm GC and tail call support is required to play
this game. We recommend using either Mozilla Firefox or Google
Chrome. Safari is currently unsupported.
</p>
</body>
</html>

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(use-modules (guix packages)
(gnu packages base)
(gnu packages compression)
(gnu packages guile)
(gnu packages guile-xyz))
(packages->manifest (list guile-next guile-hoot gnu-make zip))

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; HTMLCanvasElement and CanvasRenderingContext2D bindings.
;;;
;;; Code:
(define-module (dom canvas)
#:use-module (hoot ffi)
#:export (get-context
set-fill-color!
set-font!
set-text-align!
clear-rect
fill-rect
fill-text
draw-image
set-scale!
set-transform!
set-image-smoothing-enabled!))
;; HTMLCanvasElement
(define-foreign get-context
"canvas" "getContext"
(ref extern) (ref string) -> (ref extern))
;; CanvasRenderingContext2D
(define-foreign set-fill-color!
"canvas" "setFillColor"
(ref extern) (ref string) -> none)
(define-foreign set-font!
"canvas" "setFont"
(ref extern) (ref string) -> none)
(define-foreign set-text-align!
"canvas" "setTextAlign"
(ref extern) (ref string) -> none)
(define-foreign clear-rect
"canvas" "clearRect"
(ref extern) f64 f64 f64 f64 -> none)
(define-foreign fill-rect
"canvas" "fillRect"
(ref extern) f64 f64 f64 f64 -> none)
(define-foreign fill-text
"canvas" "fillText"
(ref extern) (ref string) f64 f64 -> none)
(define-foreign draw-image
"canvas" "drawImage"
(ref extern) (ref extern) f64 f64 f64 f64 f64 f64 f64 f64 -> none)
(define-foreign set-scale!
"canvas" "setScale"
(ref extern) f64 f64 -> none)
(define-foreign set-transform!
"canvas" "setTransform"
(ref extern) f64 f64 f64 f64 f64 f64 -> none)
(define-foreign set-image-smoothing-enabled!
"canvas" "setImageSmoothingEnabled"
(ref extern) i32 -> none)

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; Document bindings.
;;;
;;; Code:
(define-module (dom document)
#:use-module (hoot ffi)
#:export (current-document
document-body
get-element-by-id
make-text-node
make-element))
(define-foreign current-document
"document" "get"
-> (ref extern))
(define-foreign document-body
"document" "body"
-> (ref null extern))
(define-foreign get-element-by-id
"document" "getElementById"
(ref string) -> (ref null extern))
(define-foreign make-text-node
"document" "createTextNode"
(ref string) -> (ref extern))
(define-foreign make-element
"document" "createElement"
(ref string) -> (ref extern))

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; Element bindings.
;;;
;;; Code:
(define-module (dom element)
#:use-module (hoot ffi)
#:export (element-value
set-element-value!
element-width set-element-width!
element-height set-element-height!
append-child!
remove!
replace-with!
set-attribute!
remove-attribute!
clone-element))
(define-foreign element-value
"element" "value"
(ref extern) -> (ref string))
(define-foreign set-element-value!
"element" "setValue"
(ref extern) (ref string) -> none)
(define-foreign element-width
"element" "width"
(ref extern) -> i32)
(define-foreign element-height
"element" "height"
(ref extern) -> i32)
(define-foreign set-element-width!
"element" "setWidth"
(ref extern) i32 -> none)
(define-foreign set-element-height!
"element" "setHeight"
(ref extern) i32 -> none)
(define-foreign append-child!
"element" "appendChild"
(ref extern) (ref extern) -> (ref extern))
(define-foreign remove!
"element" "remove"
(ref extern) -> none)
(define-foreign replace-with!
"element" "replaceWith"
(ref extern) (ref extern) -> none)
(define-foreign set-attribute!
"element" "setAttribute"
(ref extern) (ref string) (ref string) -> none)
(define-foreign remove-attribute!
"element" "removeAttribute"
(ref extern) (ref string) -> none)
(define-foreign clone-element
"element" "clone"
(ref extern) -> (ref extern))

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; EventTarget and Event bindings.
;;;
;;; Code:
(define-module (dom event)
#:use-module (hoot ffi)
#:export (add-event-listener!
remove-event-listener!
prevent-default!
keyboard-event-code))
;; EventTarget
(define-foreign add-event-listener!
"event" "addEventListener"
(ref extern) (ref string) (ref extern) -> none)
(define-foreign remove-event-listener!
"event" "removeEventListener"
(ref extern) (ref string) (ref extern) -> none)
;; Event
(define-foreign prevent-default!
"event" "preventDefault"
(ref extern) -> none)
;; KeyboardEvent
(define-foreign keyboard-event-code
"event" "keyboardCode"
(ref extern) -> (ref string))

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; HTMLImageElement bindings.
;;;
;;; Code:
(define-module (dom image)
#:use-module (hoot ffi)
#:export (make-image))
(define-foreign make-image
"image" "new"
(ref string) -> (ref extern))

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; HTMLMediaElement bindings.
;;;
;;; Code:
(define-module (dom media)
#:use-module (hoot ffi)
#:use-module (ice-9 match)
#:export (make-audio
media-play
media-pause
media-volume
set-media-volume!
set-media-loop!
media-seek))
(define-foreign make-audio
"media" "newAudio"
(ref string) -> (ref extern))
(define-foreign media-play
"media" "play"
(ref extern) -> none)
(define-foreign media-pause
"media" "pause"
(ref extern) -> none)
(define-foreign media-volume
"media" "volume"
(ref extern) -> f64)
(define-foreign set-media-volume!
"media" "setVolume"
(ref extern) f64 -> none)
(define-foreign set-media-loop!
"media" "setLoop"
(ref extern) i32 -> none)
(define-foreign media-seek
"media" "seek"
(ref extern) f64 -> none)

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; Window bindings.
;;;
;;; Code:
(define-module (dom window)
#:use-module (hoot ffi)
#:export (current-window
window-inner-width
window-inner-height
request-animation-frame
timeout))
(define-foreign current-window
"window" "get"
-> (ref extern))
(define-foreign window-inner-width
"window" "innerWidth"
(ref extern) -> i32)
(define-foreign window-inner-height
"window" "innerHeight"
(ref extern) -> i32)
(define-foreign request-animation-frame
"window" "requestAnimationFrame"
(ref extern) -> none)
(define-foreign timeout
"window" "setTimeout"
(ref extern) f64 -> i32)

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; Helpful math things.
;;;
;;; Code:
(define-module (math)
#:pure
#:use-module (scheme base)
#:use-module (hoot ffi)
#:export (random clamp))
(define-foreign random
"math" "random"
-> f64)
(define (clamp x min max)
(cond ((< x min) min)
((> x max) max)
(else x)))

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; Rectangle data type.
;;;
;;; Code:
(define-module (math rect)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-9)
#:export (make-rect
rect?
rect-x
rect-y
rect-width
rect-height
set-rect-x!
set-rect-y!
set-rect-width!
set-rect-height!
rect-intersects?
rect-clip))
;; For speed, a rect is a wrapper around a bytevector so that we can
;; use unboxed floats.
(define-record-type <rect>
(%make-rect bv)
rect?
(bv rect-bv))
(define f64-ref bytevector-ieee-double-native-ref)
(define f64-set! bytevector-ieee-double-native-set!)
(define (make-rect x y w h)
(let ((bv (make-bytevector (* 8 4))))
(f64-set! bv 0 x)
(f64-set! bv 8 y)
(f64-set! bv 16 w)
(f64-set! bv 24 h)
(%make-rect bv)))
(define (rect-x r)
(f64-ref (rect-bv r) 0))
(define (rect-y r)
(f64-ref (rect-bv r) 8))
(define (rect-width r)
(f64-ref (rect-bv r) 16))
(define (rect-height r)
(f64-ref (rect-bv r) 24))
(define (set-rect-x! r x)
(f64-set! (rect-bv r) 0 x))
(define (set-rect-y! r y)
(f64-set! (rect-bv r) 8 y))
(define (set-rect-width! r width)
(f64-set! (rect-bv r) 16 width))
(define (set-rect-height! r height)
(f64-set! (rect-bv r) 24 height))
(define (rect-intersects? a b)
(and (< (rect-x a) (+ (rect-x b) (rect-width b)))
(< (rect-y a) (+ (rect-y b) (rect-height b)))
(> (+ (rect-x a) (rect-width a)) (rect-x b))
(> (+ (rect-y a) (rect-height a)) (rect-y b))))
(define (rect-clip a b)
(let* ((x1 (max (rect-x a) (rect-x b)))
(x2 (min (+ (rect-x a) (rect-width a))
(+ (rect-x b) (rect-width b))))
(y1 (max (rect-y a) (rect-y b)))
(y2 (min (+ (rect-y a) (rect-height a))
(+ (rect-y b) (rect-height b)))))
(make-rect x1 y1 (- x2 x1) (- y2 y1))))

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;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;;
;;; Vectors, in the linear algebra sense.
;;;
;;; Code:
(define-module (math vector)
#:use-module (math)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-9)
#:export (vec2
vec2?
vec2-x
vec2-y
set-vec2-x!
set-vec2-y!
with-vec2
vec2-add!
vec2-sub!
vec2-mul-scalar!
vec2-magnitude
vec2-normalize!
vec2-clamp!))
;; For speed, a vec2 is a wrapper around a bytevector so that we can
;; use unboxed floats.
(define-record-type <vec2>
(make-vec2 bv)
vec2?
(bv vec2-bv))
(define f64-ref bytevector-ieee-double-native-ref)
(define f64-set! bytevector-ieee-double-native-set!)
(define (vec2 x y)
(let ((v (make-vec2 (make-bytevector 16))))
(set-vec2-x! v x)
(set-vec2-y! v y)
v))
(define (vec2-x v)
(f64-ref (vec2-bv v) 0))
(define (vec2-y v)
(f64-ref (vec2-bv v) 8))
(define (set-vec2-x! v x)
(f64-set! (vec2-bv v) 0 x))
(define (set-vec2-y! v y)
(f64-set! (vec2-bv v) 8 y))
(define (vec2-add! v w)
(set-vec2-x! v (+ (vec2-x v) (vec2-x w)))
(set-vec2-y! v (+ (vec2-y v) (vec2-y w))))
(define (vec2-sub! v w)
(set-vec2-x! v (- (vec2-x v) (vec2-x w)))
(set-vec2-y! v (- (vec2-y v) (vec2-y w))))
(define (vec2-mul-scalar! v x)
(set-vec2-x! v (* (vec2-x v) x))
(set-vec2-y! v (* (vec2-y v) x)))
(define (vec2-magnitude v)
(sqrt (+ (* (vec2-x v) (vec2-x v)) (* (vec2-y v) (vec2-y v)))))
(define (vec2-normalize! v)
(unless (and (= (vec2-x v) 0.0) (= (vec2-y v) 0.0))
(let ((m (vec2-magnitude v)))
(set-vec2-x! v (/ (vec2-x v) m))
(set-vec2-y! v (/ (vec2-y v) m)))))
(define (vec2-clamp! v xmin ymin xmax ymax)
(set-vec2-x! v (clamp (vec2-x v) xmin xmax))
(set-vec2-y! v (clamp (vec2-y v) ymin ymax)))

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// -*- js2-basic-offset: 4 -*-
class Char {
constructor(codepoint) {
this.codepoint = codepoint;
}
toString() {
let ch = String.fromCodePoint(this.codepoint);
if (ch.match(/[a-zA-Z0-9$[\]().]/)) return `#\\${ch}`;
return `#\\x${this.codepoint.toString(16)}`;
}
}
class Eof { toString() { return "#<eof>"; } }
class Nil { toString() { return "#nil"; } }
class Null { toString() { return "()"; } }
class Unspecified { toString() { return "#<unspecified>"; } }
class Complex {
constructor(real, imag) {
this.real = real;
this.imag = imag;
}
toString() {
const sign = this.imag >= 0 && Number.isFinite(this.imag) ? "+": "";
return `${flonum_to_string(this.real)}${sign}${flonum_to_string(this.imag)}i`;
}
}
class Fraction {
constructor(num, denom) {
this.num = num;
this.denom = denom;
}
toString() {
return `${this.num}/${this.denom}`;
}
}
class HeapObject {
constructor(reflector, obj) {
this.reflector = reflector;
this.obj = obj;
}
repr() { return this.toString(); } // Default implementation.
}
class Pair extends HeapObject {
toString() { return "#<pair>"; }
repr() {
let car_repr = repr(this.reflector.car(this));
let cdr_repr = repr(this.reflector.cdr(this));
if (cdr_repr == '()')
return `(${car_repr})`;
if (cdr_repr.charAt(0) == '(')
return `(${car_repr} ${cdr_repr.substring(1)}`;
return `(${car_repr} . ${cdr_repr})`;
}
}
class MutablePair extends Pair { toString() { return "#<mutable-pair>"; } }
class Vector extends HeapObject {
toString() { return "#<vector>"; }
repr() {
let len = this.reflector.vector_length(this);
let out = '#(';
for (let i = 0; i < len; i++) {
if (i) out += ' ';
out += repr(this.reflector.vector_ref(this, i));
}
out += ')';
return out;
}
}
class MutableVector extends Vector {
toString() { return "#<mutable-vector>"; }
}
class Bytevector extends HeapObject {
toString() { return "#<bytevector>"; }
repr() {
let len = this.reflector.bytevector_length(this);
let out = '#vu8(';
for (let i = 0; i < len; i++) {
if (i) out += ' ';
out += this.reflector.bytevector_ref(this, i);
}
out += ')';
return out;
}
}
class MutableBytevector extends Bytevector {
toString() { return "#<mutable-bytevector>"; }
}
class Bitvector extends HeapObject {
toString() { return "#<bitvector>"; }
repr() {
let len = this.reflector.bitvector_length(this);
let out = '#*';
for (let i = 0; i < len; i++) {
out += this.reflector.bitvector_ref(this, i) ? '1' : '0';
}
return out;
}
}
class MutableBitvector extends Bitvector {
toString() { return "#<mutable-bitvector>"; }
}
class MutableString extends HeapObject {
toString() { return "#<mutable-string>"; }
repr() { return string_repr(this.reflector.string_value(this)); }
}
class Procedure extends HeapObject {
toString() { return "#<procedure>"; }
call(...arg) {
return this.reflector.call(this, ...arg);
}
async call_async(...arg) {
return await this.reflector.call_async(this, ...arg);
}
}
class Sym extends HeapObject {
toString() { return "#<symbol>"; }
repr() { return this.reflector.symbol_name(this); }
}
class Keyword extends HeapObject {
toString() { return "#<keyword>"; }
repr() { return `#:${this.reflector.keyword_name(this)}`; }
}
class Variable extends HeapObject { toString() { return "#<variable>"; } }
class AtomicBox extends HeapObject { toString() { return "#<atomic-box>"; } }
class HashTable extends HeapObject { toString() { return "#<hash-table>"; } }
class WeakTable extends HeapObject { toString() { return "#<weak-table>"; } }
class Fluid extends HeapObject { toString() { return "#<fluid>"; } }
class DynamicState extends HeapObject { toString() { return "#<dynamic-state>"; } }
class Syntax extends HeapObject { toString() { return "#<syntax>"; } }
class Port extends HeapObject { toString() { return "#<port>"; } }
class Struct extends HeapObject { toString() { return "#<struct>"; } }
function instantiate_streaming(path, imports) {
if (typeof fetch !== 'undefined' && typeof window !== 'undefined')
return WebAssembly.instantiateStreaming(fetch(path), imports);
let bytes;
if (typeof read !== 'undefined') {
bytes = read(path, 'binary');
} else if (typeof readFile !== 'undefined') {
bytes = readFile(path);
} else {
let fs = require('fs');
bytes = fs.readFileSync(path);
}
return WebAssembly.instantiate(bytes, imports);
}
class IterableWeakSet {
#array;
#set;
constructor() { this.#array = []; this.#set = new WeakSet; }
#kill(i) {
let tail = this.#array.pop();
if (i < this.#array.length)
this.#array[i] = tail;
}
#get(i) {
if (i >= this.#array.length)
return null;
let obj = this.#array[i].deref();
if (obj)
return obj;
this.#kill(i);
return null;
}
#cleanup() {
let i = 0;
while (this.#get(i)) i++;
}
has(x) { return this.#set.has(x); }
add(x) {
if (this.has(x))
return;
if (this.#array.length % 32 == 0)
this.#cleanup();
this.#set.add(x);
this.#array.push(new WeakRef(x));
}
delete(x) {
if (!this.has(x))
return;
this.#set.delete(x);
let i = 0;
while (this.#get(i) != x) i++;
this.#kill(i);
}
*[Symbol.iterator]() {
for (let i = 0, x; x = this.#get(i); i++)
yield x;
}
}
class Scheme {
#instance;
#abi;
constructor(instance, abi) {
this.#instance = instance;
this.#abi = abi;
}
static async reflect(abi, {reflect_wasm_dir = '.'}) {
let debug = {
debug_str(x) { console.log(`reflect debug: ${x}`); },
debug_str_i32(x, y) { console.log(`reflect debug: ${x}: ${y}`); },
debug_str_scm: (x, y) => {
console.log(`reflect debug: ${x}: #<scm>`);
},
code_source(x) { return ['???', 0, 0]; }
};
let reflect_wasm = reflect_wasm_dir + '/reflect.wasm';
let rt = {
quit(status) { throw new SchemeQuitError(status); },
die(tag, data) { throw new SchemeTrapError(tag, data); },
wtf8_to_string(wtf8) { return wtf8_to_string(wtf8); },
string_to_wtf8(str) { return string_to_wtf8(str); },
};
let { module, instance } =
await instantiate_streaming(reflect_wasm, { abi, debug, rt });
return new Scheme(instance, abi);
}
#init_module(mod) {
mod.set_debug_handler({
debug_str(x) { console.log(`debug: ${x}`); },
debug_str_i32(x, y) { console.log(`debug: ${x}: ${y}`); },
debug_str_scm: (x, y) => {
console.log(`debug: ${x}: ${repr(this.#to_js(y))}`);
},
});
mod.set_ffi_handler({
procedure_to_extern: (obj) => {
const proc = this.#to_js(obj);
return (...args) => {
return proc.call(...args);
};
}
});
let proc = new Procedure(this, mod.get_export('$load').value);
return proc.call();
}
static async load_main(path, opts = {}) {
let mod = await SchemeModule.fetch_and_instantiate(path, opts);
let reflect = await mod.reflect(opts);
return reflect.#init_module(mod);
}
async load_extension(path, opts = {}) {
opts = Object.assign({ abi: this.#abi }, opts);
let mod = await SchemeModule.fetch_and_instantiate(path, opts);
return this.#init_module(mod);
}
#to_scm(js) {
let api = this.#instance.exports;
if (typeof(js) == 'number') {
return api.scm_from_f64(js);
} else if (typeof(js) == 'bigint') {
if (BigInt(api.scm_most_negative_fixnum()) <= js
&& js <= BigInt(api.scm_most_positive_fixnum()))
return api.scm_from_fixnum(Number(js));
return api.scm_from_bignum(js);
} else if (typeof(js) == 'boolean') {
return js ? api.scm_true() : api.scm_false();
} else if (typeof(js) == 'string') {
return api.scm_from_string(js);
} else if (typeof(js) == 'object') {
if (js instanceof Eof) return api.scm_eof();
if (js instanceof Nil) return api.scm_nil();
if (js instanceof Null) return api.scm_null();
if (js instanceof Unspecified) return api.scm_unspecified();
if (js instanceof Char) return api.scm_from_char(js.codepoint);
if (js instanceof HeapObject) return js.obj;
if (js instanceof Fraction)
return api.scm_from_fraction(this.#to_scm(js.num),
this.#to_scm(js.denom));
if (js instanceof Complex)
return api.scm_from_complex(js.real, js.imag);
return api.scm_from_extern(js);
} else if (typeof(js) == 'function') {
return api.scm_from_extern(js);
} else {
throw new Error(`unexpected; ${typeof(js)}`);
}
}
#to_js(scm) {
let api = this.#instance.exports;
let descr = api.describe(scm);
let handlers = {
fixnum: () => BigInt(api.fixnum_value(scm)),
char: () => new Char(api.char_value(scm)),
true: () => true,
false: () => false,
eof: () => new Eof,
nil: () => new Nil,
null: () => new Null,
unspecified: () => new Unspecified,
flonum: () => api.flonum_value(scm),
bignum: () => api.bignum_value(scm),
complex: () => new Complex(api.complex_real(scm),
api.complex_imag(scm)),
fraction: () => new Fraction(this.#to_js(api.fraction_num(scm)),
this.#to_js(api.fraction_denom(scm))),
pair: () => new Pair(this, scm),
'mutable-pair': () => new MutablePair(this, scm),
vector: () => new Vector(this, scm),
'mutable-vector': () => new MutableVector(this, scm),
bytevector: () => new Bytevector(this, scm),
'mutable-bytevector': () => new MutableBytevector(this, scm),
bitvector: () => new Bitvector(this, scm),
'mutable-bitvector': () => new MutableBitvector(this, scm),
string: () => api.string_value(scm),
'mutable-string': () => new MutableString(this, scm),
procedure: () => new Procedure(this, scm),
symbol: () => new Sym(this, scm),
keyword: () => new Keyword(this, scm),
variable: () => new Variable(this, scm),
'atomic-box': () => new AtomicBox(this, scm),
'hash-table': () => new HashTable(this, scm),
'weak-table': () => new WeakTable(this, scm),
fluid: () => new Fluid(this, scm),
'dynamic-state': () => new DynamicState(this, scm),
syntax: () => new Syntax(this, scm),
port: () => new Port(this, scm),
struct: () => new Struct(this, scm),
'extern-ref': () => api.extern_value(scm)
};
let handler = handlers[descr];
return handler ? handler() : scm;
}
call(func, ...args) {
let api = this.#instance.exports;
let argv = api.make_vector(args.length + 1, api.scm_false());
func = this.#to_scm(func);
api.vector_set(argv, 0, func);
for (let [idx, arg] of args.entries())
api.vector_set(argv, idx + 1, this.#to_scm(arg));
argv = api.call(func, argv);
let results = [];
for (let idx = 0; idx < api.vector_length(argv); idx++)
results.push(this.#to_js(api.vector_ref(argv, idx)))
return results;
}
call_async(func, ...args) {
return new Promise((resolve, reject) => {
this.call(func,
val => resolve(this.#to_js(val)),
err => reject(this.#to_js(err)),
...args);
})
}
car(x) { return this.#to_js(this.#instance.exports.car(x.obj)); }
cdr(x) { return this.#to_js(this.#instance.exports.cdr(x.obj)); }
vector_length(x) { return this.#instance.exports.vector_length(x.obj); }
vector_ref(x, i) {
return this.#to_js(this.#instance.exports.vector_ref(x.obj, i));
}
bytevector_length(x) {
return this.#instance.exports.bytevector_length(x.obj);
}
bytevector_ref(x, i) {
return this.#instance.exports.bytevector_ref(x.obj, i);
}
bitvector_length(x) {
return this.#instance.exports.bitvector_length(x.obj);
}
bitvector_ref(x, i) {
return this.#instance.exports.bitvector_ref(x.obj, i) == 1;
}
string_value(x) { return this.#instance.exports.string_value(x.obj); }
symbol_name(x) { return this.#instance.exports.symbol_name(x.obj); }
keyword_name(x) { return this.#instance.exports.keyword_name(x.obj); }
}
class SchemeTrapError extends Error {
constructor(tag, data) { super(); this.tag = tag; this.data = data; }
// FIXME: data is raw Scheme object; would need to be reflected to
// have a toString.
toString() { return `SchemeTrap(${this.tag}, <data>)`; }
}
class SchemeQuitError extends Error {
constructor(status) { super(); this.status = status; }
toString() { return `SchemeQuit(status=${this.status})`; }
}
function string_repr(str) {
// FIXME: Improve to match Scheme.
return '"' + str.replace(/(["\\])/g, '\\$1').replace(/\n/g, '\\n') + '"';
}
function flonum_to_string(f64) {
if (Object.is(f64, -0)) {
return '-0.0';
} else if (Number.isFinite(f64)) {
let repr = f64 + '';
return /^-?[0-9]+$/.test(repr) ? repr + '.0' : repr;
} else if (Number.isNaN(f64)) {
return '+nan.0';
} else {
return f64 < 0 ? '-inf.0' : '+inf.0';
}
}
let async_invoke = typeof queueMicrotask !== 'undefined'
? queueMicrotask
: thunk => setTimeout(thunk, 0);
function async_invoke_later(thunk, jiffies) {
setTimeout(thunk, jiffies / 1000);
}
let wtf8_helper;
function wtf8_to_string(wtf8) {
let { as_iter, iter_next } = wtf8_helper.exports;
let codepoints = [];
let iter = as_iter(wtf8);
for (let cp = iter_next(iter); cp != -1; cp = iter_next(iter))
codepoints.push(cp);
// Passing too many codepoints can overflow the stack.
let maxcp = 100000;
if (codepoints.length <= maxcp) {
return String.fromCodePoint(...codepoints);
}
// For converting large strings, concatenate several smaller
// strings.
let substrings = [];
let end = 0;
for (let start = 0; start != codepoints.length; start = end) {
end = Math.min(start + maxcp, codepoints.length);
substrings.push(String.fromCodePoint(...codepoints.slice(start, end)));
}
return substrings.join('');
}
function string_to_wtf8(str) {
let { string_builder, builder_push_codepoint, finish_builder } =
wtf8_helper.exports;
let builder = string_builder()
for (let cp of str)
builder_push_codepoint(builder, cp.codePointAt(0));
return finish_builder(builder);
}
async function load_wtf8_helper_module(reflect_wasm_dir = '') {
if (wtf8_helper) return;
let wtf8_wasm = reflect_wasm_dir + "/wtf8.wasm";
let { module, instance } = await instantiate_streaming(wtf8_wasm);
wtf8_helper = instance;
}
function make_textual_writable_stream(write_chars) {
const decoder = new TextDecoder("utf-8");
return new WritableStream({
write(chunk) {
return new Promise((resolve, reject) => {
write_chars(decoder.decode(chunk, { stream: true }));
resolve();
});
}
});
}
class SchemeModule {
#instance;
#io_handler;
#debug_handler;
#ffi_handler;
static #rt = {
bignum_from_string(str) { return BigInt(str); },
bignum_from_i32(n) { return BigInt(n); },
bignum_from_i64(n) { return n; },
bignum_from_u64(n) { return n < 0n ? 0xffff_ffff_ffff_ffffn + (n + 1n) : n; },
bignum_is_i64(n) {
return -0x8000_0000_0000_0000n <= n && n <= 0x7FFF_FFFF_FFFF_FFFFn;
},
bignum_is_u64(n) {
return 0n <= n && n <= 0xFFFF_FFFF_FFFF_FFFFn;
},
// This truncates; see https://tc39.es/ecma262/#sec-tobigint64.
bignum_get_i64(n) { return n; },
bignum_add(a, b) { return BigInt(a) + BigInt(b) },
bignum_sub(a, b) { return BigInt(a) - BigInt(b) },
bignum_mul(a, b) { return BigInt(a) * BigInt(b) },
bignum_lsh(a, b) { return BigInt(a) << BigInt(b) },
bignum_rsh(a, b) { return BigInt(a) >> BigInt(b) },
bignum_quo(a, b) { return BigInt(a) / BigInt(b) },
bignum_rem(a, b) { return BigInt(a) % BigInt(b) },
bignum_mod(a, b) {
let r = BigInt(a) % BigInt(b);
if ((b > 0n && r < 0n) || (b < 0n && r > 0n)) {
return b + r;
} else {
return r;
}
},
bignum_gcd(a, b) {
a = BigInt(a);
b = BigInt(b);
if (a < 0n) { a = -a; }
if (b < 0n) { b = -b; }
if (a == 0n) { return b; }
if (b == 0n) { return a; }
let r;
while (b != 0n) {
r = a % b;
a = b;
b = r;
}
return a;
},
bignum_logand(a, b) { return BigInt(a) & BigInt(b); },
bignum_logior(a, b) { return BigInt(a) | BigInt(b); },
bignum_logxor(a, b) { return BigInt(a) ^ BigInt(b); },
bignum_lt(a, b) { return a < b; },
bignum_le(a, b) { return a <= b; },
bignum_eq(a, b) { return a == b; },
bignum_to_f64(n) { return Number(n); },
flonum_to_string,
string_upcase: Function.call.bind(String.prototype.toUpperCase),
string_downcase: Function.call.bind(String.prototype.toLowerCase),
make_weak_map() { return new WeakMap; },
weak_map_get(map, k, fail) {
const val = map.get(k);
return val === undefined ? fail: val;
},
weak_map_set(map, k, v) { return map.set(k, v); },
weak_map_delete(map, k) { return map.delete(k); },
fsqrt: Math.sqrt,
fsin: Math.sin,
fcos: Math.cos,
ftan: Math.tan,
fasin: Math.asin,
facos: Math.acos,
fatan: Math.atan,
fatan2: Math.atan2,
flog: Math.log,
fexp: Math.exp,
jiffies_per_second() { return 1000000; },
current_jiffy() { return performance.now() * 1000; },
current_second() { return Date.now() / 1000; },
async_invoke,
async_invoke_later,
promise_on_completed(p, kt, kf) {
p.then((val) => {
if (val === undefined) {
kt(false);
} else {
kt(val);
}
}, kf);
},
promise_complete(callback, val) { callback(val); },
// Wrap in functions to allow for lazy loading of the wtf8
// module.
wtf8_to_string(wtf8) { return wtf8_to_string(wtf8); },
string_to_wtf8(str) { return string_to_wtf8(str); },
make_regexp(pattern, flags) { return new RegExp(pattern, flags); },
regexp_exec(re, str) { return re.exec(str); },
regexp_match_string(m) { return m.input; },
regexp_match_start(m) { return m.index; },
regexp_match_end(m) { return m.index + m[0].length; },
regexp_match_count(m) { return m.length; },
regexp_match_substring(m, i) {
const str = m[i];
if (str === undefined) {
return null;
}
return str;
},
die(tag, data) { throw new SchemeTrapError(tag, data); },
quit(status) { throw new SchemeQuitError(status); },
stream_make_chunk(len) { return new Uint8Array(len); },
stream_chunk_length(chunk) { return chunk.length; },
stream_chunk_ref(chunk, idx) { return chunk[idx]; },
stream_chunk_set(chunk, idx, val) { chunk[idx] = val; },
stream_get_reader(stream) { return stream.getReader(); },
stream_read(reader) { return reader.read(); },
stream_result_chunk(result) { return result.value; },
stream_result_done(result) { return result.done ? 1 : 0; },
stream_get_writer(stream) { return stream.getWriter(); },
stream_write(writer, chunk) { return writer.write(chunk); },
stream_close_writer(writer) { return writer.close(); },
};
static #code_origins = new WeakMap;
static #all_modules = new IterableWeakSet;
static #code_origin(code) {
if (SchemeModule.#code_origins.has(code))
return SchemeModule.#code_origins.get(code);
for (let mod of SchemeModule.#all_modules) {
for (let i = 0, x = null; x = mod.instance_code(i); i++) {
let origin = [mod, i];
if (!SchemeModule.#code_origins.has(x))
SchemeModule.#code_origins.set(x, origin);
if (x === code)
return origin;
}
}
return [null, 0];
}
static #code_name(code) {
let [mod, idx] = SchemeModule.#code_origin(code);
if (mod)
return mod.instance_code_name(idx);
return null;
}
static #code_source(code) {
let [mod, idx] = SchemeModule.#code_origin(code);
if (mod)
return mod.instance_code_source(idx);
return [null, 0, 0];
}
constructor(instance) {
SchemeModule.#all_modules.add(this);
this.#instance = instance;
let open_file_error = (filename) => {
throw new Error('No file system access');
};
if (typeof printErr === 'function') { // v8/sm dev console
// On the console, try to use 'write' (v8) or 'putstr' (sm),
// as these don't add an extraneous newline. Unfortunately
// JSC doesn't have a printer that doesn't add a newline.
let write_no_newline =
typeof write === 'function' ? write
: typeof putstr === 'function' ? putstr : print;
// Use readline when available. v8 strips newlines so
// we need to add them back.
let read_stdin =
typeof readline == 'function' ? () => {
let line = readline();
if (line) {
return `${line}\n`;
} else {
return '\n';
}
}: () => '';
this.#io_handler = {
write_stdout: write_no_newline,
write_stderr: printErr,
read_stdin,
file_exists: (filename) => false,
open_input_file: open_file_error,
open_output_file: open_file_error,
close_file: () => undefined,
read_file: (handle, length) => 0,
write_file: (handle, length) => 0,
seek_file: (handle, offset, whence) => -1,
file_random_access: (handle) => false,
file_buffer_size: (handle) => 0,
file_buffer_ref: (handle, i) => 0,
file_buffer_set: (handle, i, x) => undefined,
delete_file: (filename) => undefined,
// FIXME: We should polyfill these out.
stream_stdin() { throw new Error('stream_stdin not implemented'); },
stream_stdout() { throw new Error('stream_stderr not implemented'); },
stream_stderr() { throw new Error('stream_stderr not implemented'); },
};
} else if (typeof window !== 'undefined') { // web browser
this.#io_handler = {
write_stdout: console.log,
write_stderr: console.error,
read_stdin: () => '',
file_exists: (filename) => false,
open_input_file: open_file_error,
open_output_file: open_file_error,
close_file: () => undefined,
read_file: (handle, length) => 0,
write_file: (handle, length) => 0,
seek_file: (handle, offset, whence) => -1,
file_random_access: (handle) => false,
file_buffer_size: (handle) => 0,
file_buffer_ref: (handle, i) => 0,
file_buffer_set: (handle, i, x) => undefined,
delete_file: (filename) => undefined,
stream_stdin() { return new ReadableStream; },
stream_stdout() {
return make_textual_writable_stream(s => console.log(s));
},
stream_stderr() {
return make_textual_writable_stream(s => console.error(s));
},
};
} else { // nodejs
const fs = require('fs');
const process = require('process');
const { ReadableStream, WritableStream } = require('node:stream/web');
const bufLength = 1024;
const stdinBuf = Buffer.alloc(bufLength);
const SEEK_SET = 0, SEEK_CUR = 1, SEEK_END = 2;
this.#io_handler = {
write_stdout: process.stdout.write.bind(process.stdout),
write_stderr: process.stderr.write.bind(process.stderr),
read_stdin: () => {
let n = fs.readSync(process.stdin.fd, stdinBuf, 0, stdinBuf.length);
return stdinBuf.toString('utf8', 0, n);
},
file_exists: fs.existsSync.bind(fs),
open_input_file: (filename) => {
let fd = fs.openSync(filename, 'r');
return {
fd,
buf: Buffer.alloc(bufLength),
pos: 0
};
},
open_output_file: (filename) => {
let fd = fs.openSync(filename, 'w');
return {
fd,
buf: Buffer.alloc(bufLength),
pos: 0
};
},
close_file: (handle) => {
fs.closeSync(handle.fd);
},
read_file: (handle, count) => {
const n = fs.readSync(handle.fd, handle.buf, 0, count, handle.pos);
handle.pos += n;
return n;
},
write_file: (handle, count) => {
const n = fs.writeSync(handle.fd, handle.buf, 0, count, handle.pos);
handle.pos += n;
return n;
},
seek_file: (handle, offset, whence) => {
// There doesn't seem to be a way to ask NodeJS if
// a position is valid or not.
if (whence == SEEK_SET) {
handle.pos = offset;
return handle.pos;
} else if (whence == SEEK_CUR) {
handle.pos += offset;
return handle.pos;
}
// SEEK_END not supported.
return -1;
},
file_random_access: (handle) => {
return true;
},
file_buffer_size: (handle) => {
return handle.buf.length;
},
file_buffer_ref: (handle, i) => {
return handle.buf[i];
},
file_buffer_set: (handle, i, x) => {
handle.buf[i] = x;
},
delete_file: fs.rmSync.bind(fs),
stream_stdin() {
return new ReadableStream({
async start(controller) {
for await (const chunk of process.stdin) {
controller.enqueue(chunk);
}
controller.close();
}
});
},
stream_stdout() {
return make_textual_writable_stream(s => process.stdout.write(s));
},
stream_stderr() {
return make_textual_writable_stream(s => process.stderr.write(s));
},
};
}
this.#debug_handler = {
debug_str(x) { console.log(`debug: ${x}`); },
debug_str_i32(x, y) { console.log(`debug: ${x}: ${y}`); },
debug_str_scm(x, y) { console.log(`debug: ${x}: #<scm>`); },
};
}
static async fetch_and_instantiate(path, { abi, reflect_wasm_dir = '.',
user_imports = {} }) {
await load_wtf8_helper_module(reflect_wasm_dir);
let io = {
write_stdout(str) { mod.#io_handler.write_stdout(str); },
write_stderr(str) { mod.#io_handler.write_stderr(str); },
read_stdin() { return mod.#io_handler.read_stdin(); },
file_exists(filename) { return mod.#io_handler.file_exists(filename); },
open_input_file(filename) { return mod.#io_handler.open_input_file(filename); },
open_output_file(filename) { return mod.#io_handler.open_output_file(filename); },
close_file(handle) { mod.#io_handler.close_file(handle); },
read_file(handle, length) { return mod.#io_handler.read_file(handle, length); },
write_file(handle, length) { return mod.#io_handler.write_file(handle, length); },
seek_file(handle, offset, whence) { return mod.#io_handler.seek_file(handle, offset, whence); },
file_random_access(handle) { return mod.#io_handler.file_random_access(handle); },
file_buffer_size(handle) { return mod.#io_handler.file_buffer_size(handle); },
file_buffer_ref(handle, i) { return mod.#io_handler.file_buffer_ref(handle, i); },
file_buffer_set(handle, i, x) { return mod.#io_handler.file_buffer_set(handle, i, x); },
delete_file(filename) { mod.#io_handler.delete_file(filename); },
stream_stdin() { return mod.#io_handler.stream_stdin(); },
stream_stdout() { return mod.#io_handler.stream_stdout(); },
stream_stderr() { return mod.#io_handler.stream_stderr(); },
};
let debug = {
debug_str(x) { mod.#debug_handler.debug_str(x); },
debug_str_i32(x, y) { mod.#debug_handler.debug_str_i32(x, y); },
debug_str_scm(x, y) { mod.#debug_handler.debug_str_scm(x, y); },
code_name(code) { return SchemeModule.#code_name(code); },
code_source(code) { return SchemeModule.#code_source(code); },
}
let ffi = {
procedure_to_extern(proc) {
return mod.#ffi_handler.procedure_to_extern(proc);
}
};
let imports = {
rt: SchemeModule.#rt,
abi, debug, io, ffi, ...user_imports
};
let { module, instance } = await instantiate_streaming(path, imports);
let mod = new SchemeModule(instance);
return mod;
}
set_io_handler(h) { this.#io_handler = h; }
set_debug_handler(h) { this.#debug_handler = h; }
set_ffi_handler(h) { this.#ffi_handler = h; }
all_exports() { return this.#instance.exports; }
exported_abi() {
let abi = {}
for (let [k, v] of Object.entries(this.all_exports())) {
if (k.startsWith("$"))
abi[k] = v;
}
return abi;
}
exports() {
let ret = {}
for (let [k, v] of Object.entries(this.all_exports())) {
if (!k.startsWith("$"))
ret[k] = v;
}
return ret;
}
get_export(name) {
if (name in this.all_exports())
return this.all_exports()[name];
throw new Error(`unknown export: ${name}`)
}
instance_code(idx) {
if ('%instance-code' in this.all_exports()) {
return this.all_exports()['%instance-code'](idx);
}
return null;
}
instance_code_name(idx) {
if ('%instance-code-name' in this.all_exports()) {
return this.all_exports()['%instance-code-name'](idx);
}
return null;
}
instance_code_source(idx) {
if ('%instance-code-source' in this.all_exports()) {
return this.all_exports()['%instance-code-source'](idx);
}
return [null, 0, 0];
}
async reflect(opts = {}) {
return await Scheme.reflect(this.exported_abi(), opts);
}
}
function repr(obj) {
if (obj instanceof HeapObject)
return obj.repr();
if (typeof obj === 'boolean')
return obj ? '#t' : '#f';
if (typeof obj === 'number')
return flonum_to_string(obj);
if (typeof obj === 'string')
return string_repr(obj);
return obj + '';
}
// Modulize when possible.
if (typeof exports !== 'undefined') {
exports.Scheme = Scheme;
exports.SchemeQuitError = SchemeQuitError;
exports.repr = repr;
}

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