bot/node_modules/ts-mixer/dist/cjs/mixin-tracking.js

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2022-02-16 11:32:42 +01:00
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.hasMixin = exports.registerMixins = exports.getMixinsForClass = void 0;
const util_1 = require("./util");
// Keeps track of constituent classes for every mixin class created by ts-mixer.
const mixins = new Map();
const getMixinsForClass = (clazz) => mixins.get(clazz);
exports.getMixinsForClass = getMixinsForClass;
const registerMixins = (mixedClass, constituents) => mixins.set(mixedClass, constituents);
exports.registerMixins = registerMixins;
const hasMixin = (instance, mixin) => {
if (instance instanceof mixin)
return true;
const constructor = instance.constructor;
const visited = new Set();
let frontier = new Set();
frontier.add(constructor);
while (frontier.size > 0) {
// check if the frontier has the mixin we're looking for. if not, we can say we visited every item in the frontier
if (frontier.has(mixin))
return true;
frontier.forEach(item => visited.add(item));
// build a new frontier based on the associated mixin classes and prototype chains of each frontier item
const newFrontier = new Set();
frontier.forEach(item => {
var _a;
const itemConstituents = (_a = mixins.get(item)) !== null && _a !== void 0 ? _a : util_1.protoChain(item.prototype).map(proto => proto.constructor).filter(item => item !== null);
if (itemConstituents)
itemConstituents.forEach(constituent => {
if (!visited.has(constituent) && !frontier.has(constituent))
newFrontier.add(constituent);
});
});
// we have a new frontier, now search again
frontier = newFrontier;
}
// if we get here, we couldn't find the mixin anywhere in the prototype chain or associated mixin classes
return false;
};
exports.hasMixin = hasMixin;