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59 lines
1.3 KiB
59 lines
1.3 KiB
// @flow
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import type { Modifier } from '../types';
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import { modifierPhases } from '../enums';
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// source: https://stackoverflow.com/questions/49875255
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function order(modifiers) {
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const map = new Map();
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const visited = new Set();
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const result = [];
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modifiers.forEach(modifier => {
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map.set(modifier.name, modifier);
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});
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// On visiting object, check for its dependencies and visit them recursively
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function sort(modifier: Modifier<any, any>) {
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visited.add(modifier.name);
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const requires = [
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...(modifier.requires || []),
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...(modifier.requiresIfExists || []),
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];
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requires.forEach(dep => {
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if (!visited.has(dep)) {
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const depModifier = map.get(dep);
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if (depModifier) {
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sort(depModifier);
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}
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}
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});
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result.push(modifier);
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}
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modifiers.forEach(modifier => {
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if (!visited.has(modifier.name)) {
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// check for visited object
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sort(modifier);
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}
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});
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return result;
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}
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export default function orderModifiers(
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modifiers: Array<Modifier<any, any>>
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): Array<Modifier<any, any>> {
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// order based on dependencies
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const orderedModifiers = order(modifiers);
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// order based on phase
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return modifierPhases.reduce((acc, phase) => {
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return acc.concat(
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orderedModifiers.filter(modifier => modifier.phase === phase)
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);
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}, []);
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}
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