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