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fxio.js
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fxio.js
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// The adapter consumes a sequence generator and returns a Mithril-consumable component
export const adapter = generator => function Sequencer(vnode){
// effects instructions from the consuming sequence
const fx = Object.freeze(new class FX {
enter = Symbol('enter')
paint = Symbol('paint')
update = Symbol('update')
exit = Symbol('exit')
})
// input & output readable by sequence
const io = new class IO {
get attrs(){ return vnode.attrs }
get children(){ return vnode.children }
get dom(){ return vnode.dom }
get domSize(){ return vnode.domSize }
}
// this is the sum of the sequences surface interface
const iterator = generator(fx, io)
// instructions passed between component & iterator
const cmd = Object.create({
view : () => '',
ready : () => {},
update : () => {},
exit : () => {},
resolve : undefined, // defined below
})
// state shared between component & iterator
const state = {
ready : false,
exit : false,
done : new Promise(_ => {
cmd.resolve = _
})
}
void function iterate({value, done}){
delete cmd.update
if(done)
cmd.resolve()
else if(typeof value === 'function'){
cmd.view = value
iterate(iterator.next(true))
}
else if(value === fx.ready)
if(state.ready)
iterate(iterator.next({dom : vnode.dom, domSize: vnode.domSize}))
else
cmd.ready = () =>
iterate(iterator.next({dom : vnode.dom, domSize: vnode.domSize}))
else if(value === fx.update)
if(state.exit)
iterate(iterator.next(false))
else
cmd.update = _ =>
iterate(iterator.next(_))
else if(value === fx.exit)
if(state.exit)
iterate(iterator.next(false))
else
cmd.exit = _ =>
iterate(iterator.next(_))
else
Promise
.resolve(value)
.then(
value => iterate(iterator.next(value)),
error => iterate(iterator.throw(error)),
)
}(iterator.next(io))
// Mithril-consumed component interface
return {
view(){
return cmd.view.apply(this, arguments)
},
oncreate(_){
Object.assign(vnode, _)
state.ready = true
cmd.ready(true)
},
onupdate(_){
Object.assign(vnode, _)
cmd.update(true)
},
onbeforeremove(){
state.exit = true
cmd.update(false)
cmd.exit(true)
return state.done
},
onremove(){
state.exit = true
cmd.update(false)
cmd.exit(false)
},
}
}
const Generator = (function * (){}).constructor
const components = new WeakMap
// Mithril monkey-patch
export const m = Object.assign(
(tag, ...input) =>
globalThis.m(
(
tag instanceof Generator
?
getSet(components, tag, adapter)
:
tag
),
...input,
),
globalThis.m,
{mount: (dom, tag) =>
globalThis.m.mount(dom, (
tag instanceof Generator
?
getSet(components, tag, adapter)
:
tag
))
},
)
function getSet(map, key, factory){
if(map.has(key))
return map.get(key)
const value = factory(key, map)
map.set(key, value)
return value
}