Published
Edited
Feb 9, 2020
4 stars
class Widget {
constructor() {
Widget.counter = (this.id = Widget.counter || 0) + 1;
}
toString() {
return `<Widget ${this.id}>`;
}
}
baseline = Date.now()
recall = fn => {
let old = undefined;
return args => (old = fn(old, ...args));
}
composeDispose = fn =>
composeGenerators({ fill: true, extend: true })(recall(fn))
T = liveData((a, b, t, d) => md`foo: ${a} + ${b} = ${a + b} @${t} ${d}`)(
Generators.disposable(1, () => console.log('dispose', 1)),
Generators.disposable(2, () => console.log('dispose', 2)),
time(),
Generators.disposable('cats', () => console.log('dispose', 'cats'))
)
liveData = fn => {
let previous = undefined;
let pnode = undefined;
const id = DOM.uid();
const node = d3
.create('span')
//.attr('id', id)
.call(s => (pnode = s.node()))
.node();
return composeGenerators({ extend: true, fill: true })(async vals => {
const val = (previous = await fn(...vals));
const valNode =
val instanceof Node
? val
: d3
.create('span')
.call(s => s.text(String(val)))
.node();
d3.select(pnode)
.html(null)
.append(() => valNode);
return node;
});
}
function* time() {
while (true) yield Date.now();
}
class GenConstant {
constructor(value) {
this.value = { value };
}
next() {
return this.value;
}
return(v) {
return (this.value = { done: true, value: v });
}
throw(e) {
this.return();
throw e;
}
}
class GenWrap {
constructor(generator, fn = i => i) {
this.generator = generator;
this.fn = fn;
this.done = false;
}
async next(...args) {
if (this.done) {
return { done: true };
}
const { done, value } = await this.fn(await this.generator.next(...args));
if (done) {
this.done = true;
return { done, value };
}
return { value };
}
return(v) {
this.done = true;
return this.generator.return(v);
}
throw(e) {
this.done = true;
this.generator.throw(e);
throw e;
}
}
async function* forever(gen, finish) {
gen = await gen;
if (isIterator(gen)) {
return new GenConstant(gen);
}
let complete = false;
let last = undefined;
while (true) {
if (!complete) {
const { done, value } = await gen.next();
if (done) {
complete = true;
if (finish) {
finish();
}
} else {
last = await value;
}
}
yield { value: last };
}
}
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