41 lines
1.9 KiB
JavaScript
41 lines
1.9 KiB
JavaScript
|
"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;
|