385 lines
10 KiB
JavaScript
385 lines
10 KiB
JavaScript
(function (root, stringify) {
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/* istanbul ignore else */
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if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
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// Node.
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module.exports = stringify();
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} else if (typeof define === 'function' && define.amd) {
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// AMD, registers as an anonymous module.
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define(function () {
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return stringify();
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});
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} else {
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// Browser global.
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root.javascriptStringify = stringify();
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}
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})(this, function () {
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/**
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* Match all characters that need to be escaped in a string. Modified from
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* source to match single quotes instead of double.
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*
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* Source: https://github.com/douglascrockford/JSON-js/blob/master/json2.js
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*/
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var ESCAPABLE = /[\\\'\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
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/**
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* Map of characters to escape characters.
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*/
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var META_CHARS = {
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'\b': '\\b',
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'\t': '\\t',
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'\n': '\\n',
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'\f': '\\f',
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'\r': '\\r',
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"'": "\\'",
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'"': '\\"',
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'\\': '\\\\'
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};
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/**
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* Escape any character into its literal JavaScript string.
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*
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* @param {string} char
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* @return {string}
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*/
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function escapeChar (char) {
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var meta = META_CHARS[char];
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return meta || '\\u' + ('0000' + char.charCodeAt(0).toString(16)).slice(-4);
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};
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/**
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* JavaScript reserved word list.
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*/
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var RESERVED_WORDS = {};
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/**
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* Map reserved words to the object.
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*/
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(
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'break else new var case finally return void catch for switch while ' +
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'continue function this with default if throw delete in try ' +
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'do instanceof typeof abstract enum int short boolean export ' +
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'interface static byte extends long super char final native synchronized ' +
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'class float package throws const goto private transient debugger ' +
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'implements protected volatile double import public let yield'
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).split(' ').map(function (key) {
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RESERVED_WORDS[key] = true;
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});
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/**
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* Test for valid JavaScript identifier.
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*/
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var IS_VALID_IDENTIFIER = /^[A-Za-z_$][A-Za-z0-9_$]*$/;
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/**
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* Check if a variable name is valid.
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*
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* @param {string} name
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* @return {boolean}
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*/
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function isValidVariableName (name) {
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return !RESERVED_WORDS[name] && IS_VALID_IDENTIFIER.test(name);
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}
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/**
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* Return the global variable name.
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*
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* @return {string}
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*/
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function toGlobalVariable (value) {
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return 'Function(' + stringify('return this;') + ')()';
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}
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/**
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* Serialize the path to a string.
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*
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* @param {Array} path
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* @return {string}
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*/
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function toPath (path) {
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var result = '';
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for (var i = 0; i < path.length; i++) {
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if (isValidVariableName(path[i])) {
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result += '.' + path[i];
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} else {
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result += '[' + stringify(path[i]) + ']';
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}
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}
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return result;
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}
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/**
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* Stringify an array of values.
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*
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* @param {Array} array
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* @param {string} indent
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* @param {Function} next
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* @return {string}
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*/
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function stringifyArray (array, indent, next) {
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// Map array values to their stringified values with correct indentation.
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var values = array.map(function (value, index) {
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var str = next(value, index);
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if (str === undefined) {
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return String(str);
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}
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return indent + str.split('\n').join('\n' + indent);
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}).join(indent ? ',\n' : ',');
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// Wrap the array in newlines if we have indentation set.
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if (indent && values) {
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return '[\n' + values + '\n]';
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}
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return '[' + values + ']';
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}
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/**
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* Stringify a map of values.
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*
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* @param {Object} object
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* @param {string} indent
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* @param {Function} next
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* @return {string}
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*/
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function stringifyObject (object, indent, next) {
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// Iterate over object keys and concat string together.
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var values = Object.keys(object).reduce(function (values, key) {
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var value = next(object[key], key);
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// Omit `undefined` object values.
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if (value === undefined) {
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return values;
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}
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// String format the key and value data.
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key = isValidVariableName(key) ? key : stringify(key);
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value = String(value).split('\n').join('\n' + indent);
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// Push the current object key and value into the values array.
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values.push(indent + key + ':' + (indent ? ' ' : '') + value);
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return values;
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}, []).join(indent ? ',\n' : ',');
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// Wrap the object in newlines if we have indentation set.
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if (indent && values) {
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return '{\n' + values + '\n}';
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}
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return '{' + values + '}';
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}
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/**
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* Convert JavaScript objects into strings.
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*/
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var OBJECT_TYPES = {
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'[object Array]': stringifyArray,
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'[object Object]': stringifyObject,
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'[object Error]': function (error) {
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return 'new Error(' + stringify(error.message) + ')';
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},
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'[object Date]': function (date) {
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return 'new Date(' + date.getTime() + ')';
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},
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'[object String]': function (string) {
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return 'new String(' + stringify(string.toString()) + ')';
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},
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'[object Number]': function (number) {
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return 'new Number(' + number + ')';
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},
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'[object Boolean]': function (boolean) {
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return 'new Boolean(' + boolean + ')';
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},
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'[object Uint8Array]': function (array, indent) {
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return 'new Uint8Array(' + stringifyArray(array) + ')';
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},
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'[object Set]': function (array, indent, next) {
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if (typeof Array.from === 'function') {
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return 'new Set(' + stringify(Array.from(array), indent, next) + ')';
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} else return undefined;
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},
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'[object Map]': function (array, indent, next) {
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if (typeof Array.from === 'function') {
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return 'new Map(' + stringify(Array.from(array), indent, next) + ')';
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} else return undefined;
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},
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'[object RegExp]': String,
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'[object Function]': String,
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'[object global]': toGlobalVariable,
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'[object Window]': toGlobalVariable
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};
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/**
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* Convert JavaScript primitives into strings.
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*/
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var PRIMITIVE_TYPES = {
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'string': function (string) {
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return "'" + string.replace(ESCAPABLE, escapeChar) + "'";
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},
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'number': String,
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'object': String,
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'boolean': String,
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'symbol': String,
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'undefined': String
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};
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/**
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* Convert any value to a string.
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*
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* @param {*} value
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* @param {string} indent
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* @param {Function} next
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* @return {string}
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*/
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function stringify (value, indent, next) {
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// Convert primitives into strings.
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if (Object(value) !== value) {
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return PRIMITIVE_TYPES[typeof value](value, indent, next);
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}
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// Handle buffer objects before recursing (node < 6 was an object, node >= 6 is a `Uint8Array`).
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if (typeof Buffer === 'function' && Buffer.isBuffer(value)) {
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return 'new Buffer(' + next(value.toString()) + ')';
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}
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// Use the internal object string to select stringification method.
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var toString = OBJECT_TYPES[Object.prototype.toString.call(value)];
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// Convert objects into strings.
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return toString ? toString(value, indent, next) : undefined;
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}
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/**
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* Stringify an object into the literal string.
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*
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* @param {*} value
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* @param {Function} [replacer]
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* @param {(number|string)} [space]
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* @param {Object} [options]
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* @return {string}
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*/
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return function (value, replacer, space, options) {
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options = options || {}
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// Convert the spaces into a string.
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if (typeof space !== 'string') {
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space = new Array(Math.max(0, space|0) + 1).join(' ');
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}
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var maxDepth = Number(options.maxDepth) || 100;
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var references = !!options.references;
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var skipUndefinedProperties = !!options.skipUndefinedProperties;
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var valueCount = Number(options.maxValues) || 100000;
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var path = [];
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var stack = [];
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var encountered = [];
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var paths = [];
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var restore = [];
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/**
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* Stringify the next value in the stack.
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*
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* @param {*} value
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* @param {string} key
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* @return {string}
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*/
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function next (value, key) {
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if (skipUndefinedProperties && value === undefined) {
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return undefined;
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}
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path.push(key);
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var result = recurse(value, stringify);
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path.pop();
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return result;
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}
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/**
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* Handle recursion by checking if we've visited this node every iteration.
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*
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* @param {*} value
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* @param {Function} stringify
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* @return {string}
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*/
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var recurse = references ?
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function (value, stringify) {
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if (value && (typeof value === 'object' || typeof value === 'function')) {
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var seen = encountered.indexOf(value);
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// Track nodes to restore later.
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if (seen > -1) {
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restore.push(path.slice(), paths[seen]);
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return;
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}
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// Track encountered nodes.
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encountered.push(value);
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paths.push(path.slice());
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}
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// Stop when we hit the max depth.
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if (path.length > maxDepth || valueCount-- <= 0) {
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return;
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}
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// Stringify the value and fallback to
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return stringify(value, space, next);
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} :
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function (value, stringify) {
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var seen = stack.indexOf(value);
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if (seen > -1 || path.length > maxDepth || valueCount-- <= 0) {
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return;
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}
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stack.push(value);
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var value = stringify(value, space, next);
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stack.pop();
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return value;
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};
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// If the user defined a replacer function, make the recursion function
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// a double step process - `recurse -> replacer -> stringify`.
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if (typeof replacer === 'function') {
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var before = recurse
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// Intertwine the replacer function with the regular recursion.
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recurse = function (value, stringify) {
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return before(value, function (value, space, next) {
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return replacer(value, space, function (value) {
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return stringify(value, space, next);
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});
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});
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};
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}
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var result = recurse(value, stringify);
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// Attempt to restore circular references.
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if (restore.length) {
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var sep = space ? '\n' : '';
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var assignment = space ? ' = ' : '=';
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var eol = ';' + sep;
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var before = space ? '(function () {' : '(function(){'
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var after = '}())'
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var results = ['var x' + assignment + result];
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for (var i = 0; i < restore.length; i += 2) {
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results.push('x' + toPath(restore[i]) + assignment + 'x' + toPath(restore[i + 1]));
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}
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results.push('return x');
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return before + sep + results.join(eol) + eol + after
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}
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return result;
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};
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});
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