53 lines
1.6 KiB
JavaScript
53 lines
1.6 KiB
JavaScript
import flat from 'flat';
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import deepmerge from 'deepmerge';
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const { unflatten } = flat;
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const DOT_REPLACEMENT = '☃';
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//function that takes a list of path and returns a deeply nested object
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//representing a tree of all of those paths
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//
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//
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// given ["foo", "bar", "foo1", "foo/bar", "foo/baz", "foo/bar/baz"]
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//
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// returns {
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// bar: null,
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// foo: {
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// bar: {
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// baz: null
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// },
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// baz: null,
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// },
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// foo1: null,
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// }
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export default function(paths) {
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// first sort the list by length, then alphanumeric
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let list = paths.slice(0).sort((a, b) => b.length - a.length || b.localeCompare(a));
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// then reduce to an array
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// and we remove all of the items that have a string
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// that starts with the same prefix from the list
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// so if we have "foo/bar/baz", both "foo" and "foo/bar"
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// won't be included in the list
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let tree = list.reduce((accumulator, ns) => {
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let nsWithPrefix = accumulator.find(path => path.startsWith(ns));
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// we need to make sure it's a match for the full path part
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let isFullMatch = nsWithPrefix && nsWithPrefix.charAt(ns.length) === '/';
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if (!isFullMatch) {
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accumulator.push(ns);
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}
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return accumulator;
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}, []);
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tree = tree.sort((a, b) => a.localeCompare(b));
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// after the reduction we're left with an array that contains
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// strings that represent the longest branches
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// we'll replace the dots in the paths, then expand the path
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// to a nested object that we can then query with Ember.get
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return deepmerge.all(
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tree.map(p => {
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p = p.replace(/\.+/g, DOT_REPLACEMENT);
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return unflatten({ [p]: null }, { delimiter: '/', object: true });
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})
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);
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}
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