93 lines
2.1 KiB
JavaScript
93 lines
2.1 KiB
JavaScript
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/*!
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* lunr.utils
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* Copyright (C) @YEAR Oliver Nightingale
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*/
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/**
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* A namespace containing utils for the rest of the lunr library
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* @namespace lunr.utils
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*/
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lunr.utils = {}
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/**
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* Print a warning message to the console.
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*
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* @param {String} message The message to be printed.
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* @memberOf lunr.utils
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* @function
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*/
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lunr.utils.warn = (function (global) {
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/* eslint-disable no-console */
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return function (message) {
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if (global.console && console.warn) {
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console.warn(message)
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}
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}
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/* eslint-enable no-console */
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})(this)
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/**
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* Convert an object to a string.
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*
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* In the case of `null` and `undefined` the function returns
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* the empty string, in all other cases the result of calling
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* `toString` on the passed object is returned.
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*
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* @param {Any} obj The object to convert to a string.
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* @return {String} string representation of the passed object.
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* @memberOf lunr.utils
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*/
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lunr.utils.asString = function (obj) {
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if (obj === void 0 || obj === null) {
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return ""
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} else {
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return obj.toString()
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}
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}
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/**
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* Clones an object.
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*
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* Will create a copy of an existing object such that any mutations
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* on the copy cannot affect the original.
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*
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* Only shallow objects are supported, passing a nested object to this
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* function will cause a TypeError.
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*
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* Objects with primitives, and arrays of primitives are supported.
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*
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* @param {Object} obj The object to clone.
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* @return {Object} a clone of the passed object.
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* @throws {TypeError} when a nested object is passed.
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* @memberOf Utils
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*/
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lunr.utils.clone = function (obj) {
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if (obj === null || obj === undefined) {
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return obj
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}
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var clone = Object.create(null),
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keys = Object.keys(obj)
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for (var i = 0; i < keys.length; i++) {
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var key = keys[i],
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val = obj[key]
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if (Array.isArray(val)) {
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clone[key] = val.slice()
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continue
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}
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if (typeof val === 'string' ||
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typeof val === 'number' ||
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typeof val === 'boolean') {
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clone[key] = val
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continue
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}
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throw new TypeError("clone is not deep and does not support nested objects")
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}
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return clone
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}
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