84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
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'use strict'
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const arrayify = require('array-back')
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const t = require('typical')
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/**
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* @module test-value
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* @example
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* const testValue = require('test-value')
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*/
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module.exports = testValue
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/**
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* @alias module:test-value
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* @param {any} - a value to test
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* @param {any} - the test query
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* @param [options] {object}
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* @param [options.strict] {boolean} - Treat an object like a value not a query.
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* @returns {boolean}
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*/
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function testValue (value, test, options) {
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options = options || {}
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if (test !== Object.prototype && t.isPlainObject(test) && t.isObject(value) && !options.strict) {
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return Object.keys(test).every(function (prop) {
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let queryValue = test[prop]
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/* get flags */
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let isNegated = false
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let isContains = false
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if (prop.charAt(0) === '!') {
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isNegated = true
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} else if (prop.charAt(0) === '+') {
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isContains = true
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}
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/* strip flag char */
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prop = (isNegated || isContains) ? prop.slice(1) : prop
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let objectValue = value[prop]
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if (isContains) {
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queryValue = arrayify(queryValue)
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objectValue = arrayify(objectValue)
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}
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const result = testValue(objectValue, queryValue, options)
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return isNegated ? !result : result
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})
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} else if (test !== Array.prototype && Array.isArray(test)) {
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const tests = test
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if (value === Array.prototype || !Array.isArray(value)) value = [ value ]
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return value.some(function (val) {
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return tests.some(function (test) {
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return testValue(val, test, options)
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})
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})
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/*
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regexes queries will always return `false` for `null`, `undefined`, `NaN`.
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This is to prevent a query like `/.+/` matching the string `undefined`.
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*/
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} else if (test instanceof RegExp) {
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if ([ 'boolean', 'string', 'number' ].indexOf(typeof value) === -1) {
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return false
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} else {
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return test.test(value)
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}
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} else if (test !== Function.prototype && typeof test === 'function') {
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return test(value)
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} else {
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return test === value
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}
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}
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/**
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* Returns a callback suitable for use by `Array` methods like `some`, `filter`, `find` etc.
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* @param {any} - the test query
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* @returns {function}
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*/
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testValue.where = function (test) {
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return function (value) {
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return testValue(value, test)
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}
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}
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