| 1 | 'use strict';
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| 2 |
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| 3 | const { resolve } = require('./utils');
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| 4 |
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| 5 | const isOperator = (str) => str.startsWith('$');
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| 6 |
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| 7 | function equals (a, b) {
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| 8 | if (typeof a === 'string' && b instanceof RegExp) {
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| 9 | return b.test(a);
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| 10 | } else if (Array.isArray(a) && Array.isArray(b)) {
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| 11 | if (a.length !== b.length) {
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| 12 | return false;
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| 13 | }
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| 14 | for (let i = 0; i < a.length; i++) {
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| 15 | if (!equals(a[i], b[i])) {
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| 16 | return false;
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| 17 | }
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| 18 | }
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| 19 | return true;
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| 20 | }
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| 21 |
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| 22 | return a === b;
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| 23 | }
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| 24 |
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| 25 | function query (value, filter = {}) {
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| 26 | if (typeof filter === 'function') {
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| 27 | return Boolean(filter(value));
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| 28 | }
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| 29 |
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| 30 | let result = 1;
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| 31 |
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| 32 | for (const key in filter) {
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| 33 | if (isOperator(key)) {
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| 34 | if (key === '$eq') {
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| 35 | result &= value === filter[key];
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| 36 | } else if (key === '$ne') {
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| 37 | result &= value !== filter[key];
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| 38 | } else if (key === '$like') {
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| 39 | result &= equals(value, filter[key]);
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| 40 | } else if (key === '$regexp' || key === '$regex') {
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| 41 | if (filter[key] instanceof RegExp) {
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| 42 | result &= filter[key].test(value);
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| 43 | } else {
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| 44 | result &= false;
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| 45 | }
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| 46 | } else if (key === '$gt') {
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| 47 | result &= value > filter[key];
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| 48 | } else if (key === '$gte') {
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| 49 | result &= value >= filter[key];
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| 50 | } else if (key === '$lt') {
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| 51 | result &= value < filter[key];
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| 52 | } else if (key === '$lte') {
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| 53 | result &= value <= filter[key];
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| 54 | } else if (key === '$in') {
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| 55 | result &= filter[key].includes(value);
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| 56 | } else if (key === '$nin') {
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| 57 | result &= ! filter[key].includes(value);
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| 58 | } else if (key === '$and') {
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| 59 | for (const and of filter[key]) {
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| 60 | result &= query(value, and);
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| 61 | if (result === 0) {
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| 62 | break;
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| 63 | }
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| 64 | }
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| 65 | } else if (key === '$or') {
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| 66 | let intermediate = 0;
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| 67 | for (const or of filter[key]) {
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| 68 | intermediate |= query(value, or);
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| 69 | if (intermediate) {
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| 70 | break;
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| 71 | }
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| 72 | }
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| 73 | result &= intermediate;
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| 74 | } else if (key === '$nor') {
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| 75 | let intermediate = 0;
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| 76 | for (const nor of filter[key]) {
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| 77 | intermediate |= query(value, nor);
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| 78 | }
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| 79 | result &= ! intermediate;
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| 80 | } else if (key === '$not') {
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| 81 | result &= !query(value, filter[key]);
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| 82 | } else if (key === '$type') {
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| 83 | result &= typeof value === filter[key];
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| 84 | } else if (key === '$exists') {
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| 85 | result &= value !== undefined;
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| 86 | } else if (key === '$size') {
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| 87 | if (Array.isArray(value) && value.length === filter[key]) {
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| 88 | result &= true;
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| 89 | } else if (typeof value === 'object' &&
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| 90 | Object.keys(value).length === filter[key]) {
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| 91 | result &= true;
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| 92 | } else {
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| 93 | result &= false;
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| 94 | }
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| 95 | } else if (key === '$mod') {
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| 96 | const divisor = filter[key][0] || filter[key];
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| 97 | const remainder = filter[key][1] || 0;
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| 98 | result &= value % divisor === remainder;
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| 99 | } else if (key === '$where') {
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| 100 | if (typeof filter[key] === 'function') {
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| 101 | result &= Boolean(filter[key](value));
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| 102 | } else {
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| 103 | result &= false;
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| 104 | }
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| 105 | } else if (key === '$elemMatch') {
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| 106 | if (Array.isArray(value)) {
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| 107 | let found = false;
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| 108 | for (const item of value) {
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| 109 | if (query(item, filter[key])) {
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| 110 | found = true;
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| 111 | break;
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| 112 | }
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| 113 | }
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| 114 | result &= found;
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| 115 | } else {
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| 116 | result &= false;
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| 117 | }
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| 118 | } else if (key === '$all') {
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| 119 | if (Array.isArray(value)) {
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| 120 | for (const item of value) {
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| 121 | result &= query(item, filter[key]);
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| 122 | if (result === 0) {
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| 123 | return false;
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| 124 | }
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| 125 | }
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| 126 | } else {
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| 127 | result &= false;
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| 128 | }
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| 129 | }
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| 130 | } else if (Array.isArray(filter[key])) {
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| 131 | result &= equals(resolve(value, key), filter[key]);
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| 132 | } else if (typeof filter[key] === 'object') {
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| 133 | result &= query(resolve(value, key), filter[key]);
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| 134 | } else {
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| 135 | result &= equals(resolve(value, key), filter[key]);
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| 136 | }
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| 137 |
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| 138 | if (result === 0) {
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| 139 | return false;
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| 140 | }
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| 141 | }
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| 142 |
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| 143 | return Boolean(result);
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| 144 | }
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| 145 |
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| 146 | module.exports = query;
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