forked from M3-Academy/challenge-algorithms-v2.0
330 lines
8.2 KiB
JavaScript
330 lines
8.2 KiB
JavaScript
'use strict';
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const object = {};
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const hasOwnProperty = object.hasOwnProperty;
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const forOwn = (object, callback) => {
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for (const key in object) {
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if (hasOwnProperty.call(object, key)) {
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callback(key, object[key]);
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}
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}
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};
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const extend = (destination, source) => {
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if (!source) {
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return destination;
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}
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forOwn(source, (key, value) => {
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destination[key] = value;
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});
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return destination;
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};
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const forEach = (array, callback) => {
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const length = array.length;
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let index = -1;
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while (++index < length) {
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callback(array[index]);
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}
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};
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const toString = object.toString;
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const isArray = Array.isArray;
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const isBuffer = Buffer.isBuffer;
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const isObject = (value) => {
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// This is a very simple check, but it’s good enough for what we need.
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return toString.call(value) == '[object Object]';
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};
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const isString = (value) => {
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return typeof value == 'string' ||
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toString.call(value) == '[object String]';
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};
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const isNumber = (value) => {
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return typeof value == 'number' ||
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toString.call(value) == '[object Number]';
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};
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const isFunction = (value) => {
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return typeof value == 'function';
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};
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const isMap = (value) => {
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return toString.call(value) == '[object Map]';
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};
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const isSet = (value) => {
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return toString.call(value) == '[object Set]';
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};
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/*--------------------------------------------------------------------------*/
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// https://mathiasbynens.be/notes/javascript-escapes#single
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const singleEscapes = {
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'"': '\\"',
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'\'': '\\\'',
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'\\': '\\\\',
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'\b': '\\b',
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'\f': '\\f',
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'\n': '\\n',
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'\r': '\\r',
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'\t': '\\t'
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// `\v` is omitted intentionally, because in IE < 9, '\v' == 'v'.
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// '\v': '\\x0B'
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};
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const regexSingleEscape = /["'\\\b\f\n\r\t]/;
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const regexDigit = /[0-9]/;
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const regexWhitelist = /[ !#-&\(-\[\]-_a-~]/;
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const jsesc = (argument, options) => {
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const increaseIndentation = () => {
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oldIndent = indent;
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++options.indentLevel;
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indent = options.indent.repeat(options.indentLevel)
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};
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// Handle options
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const defaults = {
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'escapeEverything': false,
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'minimal': false,
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'isScriptContext': false,
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'quotes': 'single',
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'wrap': false,
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'es6': false,
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'json': false,
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'compact': true,
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'lowercaseHex': false,
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'numbers': 'decimal',
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'indent': '\t',
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'indentLevel': 0,
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'__inline1__': false,
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'__inline2__': false
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};
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const json = options && options.json;
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if (json) {
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defaults.quotes = 'double';
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defaults.wrap = true;
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}
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options = extend(defaults, options);
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if (
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options.quotes != 'single' &&
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options.quotes != 'double' &&
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options.quotes != 'backtick'
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) {
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options.quotes = 'single';
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}
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const quote = options.quotes == 'double' ?
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'"' :
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(options.quotes == 'backtick' ?
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'`' :
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'\''
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);
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const compact = options.compact;
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const lowercaseHex = options.lowercaseHex;
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let indent = options.indent.repeat(options.indentLevel);
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let oldIndent = '';
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const inline1 = options.__inline1__;
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const inline2 = options.__inline2__;
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const newLine = compact ? '' : '\n';
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let result;
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let isEmpty = true;
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const useBinNumbers = options.numbers == 'binary';
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const useOctNumbers = options.numbers == 'octal';
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const useDecNumbers = options.numbers == 'decimal';
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const useHexNumbers = options.numbers == 'hexadecimal';
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if (json && argument && isFunction(argument.toJSON)) {
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argument = argument.toJSON();
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}
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if (!isString(argument)) {
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if (isMap(argument)) {
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if (argument.size == 0) {
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return 'new Map()';
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}
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if (!compact) {
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options.__inline1__ = true;
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options.__inline2__ = false;
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}
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return 'new Map(' + jsesc(Array.from(argument), options) + ')';
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}
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if (isSet(argument)) {
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if (argument.size == 0) {
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return 'new Set()';
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}
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return 'new Set(' + jsesc(Array.from(argument), options) + ')';
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}
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if (isBuffer(argument)) {
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if (argument.length == 0) {
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return 'Buffer.from([])';
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}
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return 'Buffer.from(' + jsesc(Array.from(argument), options) + ')';
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}
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if (isArray(argument)) {
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result = [];
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options.wrap = true;
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if (inline1) {
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options.__inline1__ = false;
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options.__inline2__ = true;
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}
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if (!inline2) {
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increaseIndentation();
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}
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forEach(argument, (value) => {
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isEmpty = false;
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if (inline2) {
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options.__inline2__ = false;
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}
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result.push(
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(compact || inline2 ? '' : indent) +
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jsesc(value, options)
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);
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});
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if (isEmpty) {
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return '[]';
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}
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if (inline2) {
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return '[' + result.join(', ') + ']';
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}
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return '[' + newLine + result.join(',' + newLine) + newLine +
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(compact ? '' : oldIndent) + ']';
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} else if (isNumber(argument)) {
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if (json) {
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// Some number values (e.g. `Infinity`) cannot be represented in JSON.
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return JSON.stringify(argument);
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}
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if (useDecNumbers) {
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return String(argument);
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}
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if (useHexNumbers) {
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let hexadecimal = argument.toString(16);
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if (!lowercaseHex) {
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hexadecimal = hexadecimal.toUpperCase();
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}
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return '0x' + hexadecimal;
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}
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if (useBinNumbers) {
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return '0b' + argument.toString(2);
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}
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if (useOctNumbers) {
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return '0o' + argument.toString(8);
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}
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} else if (!isObject(argument)) {
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if (json) {
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// For some values (e.g. `undefined`, `function` objects),
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// `JSON.stringify(value)` returns `undefined` (which isn’t valid
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// JSON) instead of `'null'`.
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return JSON.stringify(argument) || 'null';
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}
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return String(argument);
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} else { // it’s an object
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result = [];
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options.wrap = true;
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increaseIndentation();
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forOwn(argument, (key, value) => {
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isEmpty = false;
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result.push(
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(compact ? '' : indent) +
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jsesc(key, options) + ':' +
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(compact ? '' : ' ') +
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jsesc(value, options)
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);
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});
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if (isEmpty) {
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return '{}';
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}
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return '{' + newLine + result.join(',' + newLine) + newLine +
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(compact ? '' : oldIndent) + '}';
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}
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}
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const string = argument;
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// Loop over each code unit in the string and escape it
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let index = -1;
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const length = string.length;
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result = '';
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while (++index < length) {
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const character = string.charAt(index);
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if (options.es6) {
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const first = string.charCodeAt(index);
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if ( // check if it’s the start of a surrogate pair
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first >= 0xD800 && first <= 0xDBFF && // high surrogate
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length > index + 1 // there is a next code unit
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) {
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const second = string.charCodeAt(index + 1);
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if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate
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// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
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const codePoint = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
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let hexadecimal = codePoint.toString(16);
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if (!lowercaseHex) {
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hexadecimal = hexadecimal.toUpperCase();
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}
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result += '\\u{' + hexadecimal + '}';
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++index;
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continue;
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}
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}
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}
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if (!options.escapeEverything) {
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if (regexWhitelist.test(character)) {
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// It’s a printable ASCII character that is not `"`, `'` or `\`,
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// so don’t escape it.
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result += character;
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continue;
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}
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if (character == '"') {
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result += quote == character ? '\\"' : character;
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continue;
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}
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if (character == '`') {
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result += quote == character ? '\\`' : character;
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continue;
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}
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if (character == '\'') {
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result += quote == character ? '\\\'' : character;
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continue;
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}
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}
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if (
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character == '\0' &&
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!json &&
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!regexDigit.test(string.charAt(index + 1))
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) {
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result += '\\0';
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continue;
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}
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if (regexSingleEscape.test(character)) {
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// no need for a `hasOwnProperty` check here
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result += singleEscapes[character];
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continue;
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}
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const charCode = character.charCodeAt(0);
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if (options.minimal && charCode != 0x2028 && charCode != 0x2029) {
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result += character;
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continue;
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}
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let hexadecimal = charCode.toString(16);
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if (!lowercaseHex) {
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hexadecimal = hexadecimal.toUpperCase();
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}
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const longhand = hexadecimal.length > 2 || json;
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const escaped = '\\' + (longhand ? 'u' : 'x') +
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('0000' + hexadecimal).slice(longhand ? -4 : -2);
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result += escaped;
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continue;
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}
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if (options.wrap) {
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result = quote + result + quote;
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}
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if (quote == '`') {
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result = result.replace(/\$\{/g, '\\\$\{');
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}
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if (options.isScriptContext) {
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// https://mathiasbynens.be/notes/etago
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return result
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.replace(/<\/(script|style)/gi, '<\\/$1')
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.replace(/<!--/g, json ? '\\u003C!--' : '\\x3C!--');
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}
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return result;
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};
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jsesc.version = '2.5.2';
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module.exports = jsesc;
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