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slot.js
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slot.js
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// JS语言拓展库 - Slot 拓展
// Gen 1
import "./core.js";
Object.prototype.define({
make_flag(name) {
const flag = Symbol("flag:" + name),
set = Symbol("on:" + name),
unset = Symbol("off:" + name);
this.define({
[set]: {
get() {
this.define({
[flag]: { value: true, configurable: true },
});
return this;
},
},
[unset]: {
get() {
delete this[flag];
return this;
},
},
});
return [flag, set, unset];
},
make_slot(name) {
const slot = Symbol("slot:" + name),
set = Symbol("set:" + name);
this.define({
[set](value) {
if (value !== undefined)
this.define({
[slot]: { value, configurable: true },
});
else delete this[slot];
return this;
},
});
return [slot, set];
},
});