116 lines
2.2 KiB
JavaScript
116 lines
2.2 KiB
JavaScript
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/*!
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* group-array <https://github.com/doowb/group-array>
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*
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* Copyright (c) 2015, 2017, Brian Woodward.
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* Released under the MIT License.
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*/
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'use strict';
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var split = require('split-string');
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var flatten = require('arr-flatten');
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var union = require('union-value');
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var forOwn = require('for-own');
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var typeOf = require('kind-of');
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var get = require('get-value');
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function groupFn(arr, props) {
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if (arr == null) {
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return [];
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}
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if (!Array.isArray(arr)) {
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throw new TypeError('group-array expects an array.');
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}
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if (arguments.length === 1) {
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return arr;
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}
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var args = flatten([].slice.call(arguments, 1));
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var groups = groupBy(arr, args[0]);
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for (var i = 1; i < args.length; i++) {
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toGroup(groups, args[i]);
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}
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return groups;
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}
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function groupBy(arr, prop, key) {
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var groups = {};
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for (var i = 0; i < arr.length; i++) {
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var obj = arr[i];
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var val;
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// allow a function to modify the object
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// and/or return a val to use
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if (typeof prop === 'function') {
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val = prop.call(groups, obj, key);
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} else {
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val = get(obj, prop);
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}
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switch (typeOf(val)) {
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case 'undefined':
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break;
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case 'string':
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case 'number':
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case 'boolean':
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union(groups, escape(String(val)), obj);
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break;
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case 'object':
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case 'array':
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eachValue(groups, obj, val);
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break;
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case 'function':
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throw new Error('invalid argument type: ' + key);
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}
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}
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return groups;
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}
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function eachValue(groups, obj, val) {
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if (Array.isArray(val)) {
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val.forEach(function(key) {
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union(groups, escape(key), obj);
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});
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} else {
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forOwn(val, function(v, key) {
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union(groups, escape(key), obj);
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});
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}
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}
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function toGroup(groups, prop) {
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forOwn(groups, function(val, key) {
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if (!Array.isArray(val)) {
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groups[key] = toGroup(val, prop, key);
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} else {
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groups[key] = groupBy(val, prop, key);
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}
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});
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return groups;
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}
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function escape(str) {
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var opts = {
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strict: false,
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keepEscaping: true,
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keepDoubleQuotes: true,
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keepSingleQuotes: true
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};
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try {
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return split(str, opts).join('\\.');
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} catch (err) {
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return str;
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}
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}
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/**
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* Expose `groupArray`
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*/
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module.exports = groupFn;
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