1 | 'use strict';
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2 |
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3 | const object = {};
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4 | const hasOwnProperty = object.hasOwnProperty;
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5 | const forOwn = (object, callback) => {
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6 | for (const key in object) {
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7 | if (hasOwnProperty.call(object, key)) {
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8 | callback(key, object[key]);
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9 | }
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10 | }
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11 | };
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12 |
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13 | const extend = (destination, source) => {
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14 | if (!source) {
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15 | return destination;
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16 | }
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17 | forOwn(source, (key, value) => {
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18 | destination[key] = value;
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19 | });
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20 | return destination;
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21 | };
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22 |
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23 | const forEach = (array, callback) => {
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24 | const length = array.length;
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25 | let index = -1;
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26 | while (++index < length) {
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27 | callback(array[index]);
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28 | }
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29 | };
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30 |
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31 | const toString = object.toString;
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32 | const isArray = Array.isArray;
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33 | const isBuffer = Buffer.isBuffer;
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34 | const isObject = (value) => {
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35 | // This is a very simple check, but it’s good enough for what we need.
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36 | return toString.call(value) == '[object Object]';
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37 | };
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38 | const isString = (value) => {
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39 | return typeof value == 'string' ||
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40 | toString.call(value) == '[object String]';
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41 | };
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42 | const isNumber = (value) => {
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43 | return typeof value == 'number' ||
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44 | toString.call(value) == '[object Number]';
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45 | };
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46 | const isFunction = (value) => {
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47 | return typeof value == 'function';
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48 | };
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49 | const isMap = (value) => {
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50 | return toString.call(value) == '[object Map]';
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51 | };
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52 | const isSet = (value) => {
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53 | return toString.call(value) == '[object Set]';
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54 | };
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55 |
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56 | /*--------------------------------------------------------------------------*/
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57 |
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58 | // https://mathiasbynens.be/notes/javascript-escapes#single
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59 | const singleEscapes = {
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60 | '"': '\\"',
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61 | '\'': '\\\'',
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62 | '\\': '\\\\',
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63 | '\b': '\\b',
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64 | '\f': '\\f',
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65 | '\n': '\\n',
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66 | '\r': '\\r',
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67 | '\t': '\\t'
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68 | // `\v` is omitted intentionally, because in IE < 9, '\v' == 'v'.
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69 | // '\v': '\\x0B'
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70 | };
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71 | const regexSingleEscape = /["'\\\b\f\n\r\t]/;
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72 |
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73 | const regexDigit = /[0-9]/;
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74 | const regexWhitelist = /[ !#-&\(-\[\]-_a-~]/;
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75 |
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76 | const jsesc = (argument, options) => {
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77 | const increaseIndentation = () => {
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78 | oldIndent = indent;
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79 | ++options.indentLevel;
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80 | indent = options.indent.repeat(options.indentLevel)
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81 | };
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82 | // Handle options
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83 | const defaults = {
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84 | 'escapeEverything': false,
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85 | 'minimal': false,
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86 | 'isScriptContext': false,
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87 | 'quotes': 'single',
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88 | 'wrap': false,
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89 | 'es6': false,
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90 | 'json': false,
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91 | 'compact': true,
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92 | 'lowercaseHex': false,
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93 | 'numbers': 'decimal',
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94 | 'indent': '\t',
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95 | 'indentLevel': 0,
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96 | '__inline1__': false,
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97 | '__inline2__': false
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98 | };
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99 | const json = options && options.json;
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100 | if (json) {
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101 | defaults.quotes = 'double';
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102 | defaults.wrap = true;
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103 | }
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104 | options = extend(defaults, options);
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105 | if (
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106 | options.quotes != 'single' &&
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107 | options.quotes != 'double' &&
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108 | options.quotes != 'backtick'
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109 | ) {
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110 | options.quotes = 'single';
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111 | }
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112 | const quote = options.quotes == 'double' ?
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113 | '"' :
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114 | (options.quotes == 'backtick' ?
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115 | '`' :
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116 | '\''
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117 | );
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118 | const compact = options.compact;
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119 | const lowercaseHex = options.lowercaseHex;
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120 | let indent = options.indent.repeat(options.indentLevel);
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121 | let oldIndent = '';
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122 | const inline1 = options.__inline1__;
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123 | const inline2 = options.__inline2__;
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124 | const newLine = compact ? '' : '\n';
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125 | let result;
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126 | let isEmpty = true;
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127 | const useBinNumbers = options.numbers == 'binary';
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128 | const useOctNumbers = options.numbers == 'octal';
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129 | const useDecNumbers = options.numbers == 'decimal';
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130 | const useHexNumbers = options.numbers == 'hexadecimal';
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131 |
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132 | if (json && argument && isFunction(argument.toJSON)) {
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133 | argument = argument.toJSON();
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134 | }
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135 |
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136 | if (!isString(argument)) {
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137 | if (isMap(argument)) {
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138 | if (argument.size == 0) {
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139 | return 'new Map()';
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140 | }
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141 | if (!compact) {
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142 | options.__inline1__ = true;
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143 | options.__inline2__ = false;
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144 | }
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145 | return 'new Map(' + jsesc(Array.from(argument), options) + ')';
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146 | }
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147 | if (isSet(argument)) {
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148 | if (argument.size == 0) {
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149 | return 'new Set()';
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150 | }
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151 | return 'new Set(' + jsesc(Array.from(argument), options) + ')';
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152 | }
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153 | if (isBuffer(argument)) {
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154 | if (argument.length == 0) {
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155 | return 'Buffer.from([])';
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156 | }
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157 | return 'Buffer.from(' + jsesc(Array.from(argument), options) + ')';
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158 | }
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159 | if (isArray(argument)) {
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160 | result = [];
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161 | options.wrap = true;
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162 | if (inline1) {
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163 | options.__inline1__ = false;
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164 | options.__inline2__ = true;
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165 | }
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166 | if (!inline2) {
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167 | increaseIndentation();
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168 | }
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169 | forEach(argument, (value) => {
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170 | isEmpty = false;
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171 | if (inline2) {
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172 | options.__inline2__ = false;
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173 | }
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174 | result.push(
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175 | (compact || inline2 ? '' : indent) +
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176 | jsesc(value, options)
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177 | );
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178 | });
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179 | if (isEmpty) {
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180 | return '[]';
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181 | }
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182 | if (inline2) {
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183 | return '[' + result.join(', ') + ']';
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184 | }
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185 | return '[' + newLine + result.join(',' + newLine) + newLine +
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186 | (compact ? '' : oldIndent) + ']';
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187 | } else if (isNumber(argument)) {
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188 | if (json) {
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189 | // Some number values (e.g. `Infinity`) cannot be represented in JSON.
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190 | return JSON.stringify(argument);
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191 | }
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192 | if (useDecNumbers) {
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193 | return String(argument);
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194 | }
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195 | if (useHexNumbers) {
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196 | let hexadecimal = argument.toString(16);
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197 | if (!lowercaseHex) {
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198 | hexadecimal = hexadecimal.toUpperCase();
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199 | }
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200 | return '0x' + hexadecimal;
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201 | }
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202 | if (useBinNumbers) {
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203 | return '0b' + argument.toString(2);
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204 | }
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205 | if (useOctNumbers) {
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206 | return '0o' + argument.toString(8);
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207 | }
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208 | } else if (!isObject(argument)) {
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209 | if (json) {
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210 | // For some values (e.g. `undefined`, `function` objects),
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211 | // `JSON.stringify(value)` returns `undefined` (which isn’t valid
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212 | // JSON) instead of `'null'`.
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213 | return JSON.stringify(argument) || 'null';
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214 | }
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215 | return String(argument);
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216 | } else { // it’s an object
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217 | result = [];
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218 | options.wrap = true;
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219 | increaseIndentation();
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220 | forOwn(argument, (key, value) => {
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221 | isEmpty = false;
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222 | result.push(
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223 | (compact ? '' : indent) +
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224 | jsesc(key, options) + ':' +
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225 | (compact ? '' : ' ') +
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226 | jsesc(value, options)
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227 | );
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228 | });
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229 | if (isEmpty) {
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230 | return '{}';
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231 | }
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232 | return '{' + newLine + result.join(',' + newLine) + newLine +
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233 | (compact ? '' : oldIndent) + '}';
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234 | }
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235 | }
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236 |
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237 | const string = argument;
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238 | // Loop over each code unit in the string and escape it
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239 | let index = -1;
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240 | const length = string.length;
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241 | result = '';
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242 | while (++index < length) {
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243 | const character = string.charAt(index);
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244 | if (options.es6) {
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245 | const first = string.charCodeAt(index);
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246 | if ( // check if it’s the start of a surrogate pair
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247 | first >= 0xD800 && first <= 0xDBFF && // high surrogate
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248 | length > index + 1 // there is a next code unit
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249 | ) {
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250 | const second = string.charCodeAt(index + 1);
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251 | if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate
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252 | // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
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253 | const codePoint = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
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254 | let hexadecimal = codePoint.toString(16);
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255 | if (!lowercaseHex) {
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256 | hexadecimal = hexadecimal.toUpperCase();
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257 | }
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258 | result += '\\u{' + hexadecimal + '}';
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259 | ++index;
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260 | continue;
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261 | }
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262 | }
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263 | }
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264 | if (!options.escapeEverything) {
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265 | if (regexWhitelist.test(character)) {
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266 | // It’s a printable ASCII character that is not `"`, `'` or `\`,
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267 | // so don’t escape it.
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268 | result += character;
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269 | continue;
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270 | }
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271 | if (character == '"') {
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272 | result += quote == character ? '\\"' : character;
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273 | continue;
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274 | }
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275 | if (character == '`') {
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276 | result += quote == character ? '\\`' : character;
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277 | continue;
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278 | }
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279 | if (character == '\'') {
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280 | result += quote == character ? '\\\'' : character;
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281 | continue;
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282 | }
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283 | }
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284 | if (
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285 | character == '\0' &&
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286 | !json &&
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287 | !regexDigit.test(string.charAt(index + 1))
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288 | ) {
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289 | result += '\\0';
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290 | continue;
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291 | }
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292 | if (regexSingleEscape.test(character)) {
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293 | // no need for a `hasOwnProperty` check here
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294 | result += singleEscapes[character];
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295 | continue;
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296 | }
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297 | const charCode = character.charCodeAt(0);
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298 | if (options.minimal && charCode != 0x2028 && charCode != 0x2029) {
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299 | result += character;
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300 | continue;
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301 | }
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302 | let hexadecimal = charCode.toString(16);
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303 | if (!lowercaseHex) {
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304 | hexadecimal = hexadecimal.toUpperCase();
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305 | }
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306 | const longhand = hexadecimal.length > 2 || json;
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307 | const escaped = '\\' + (longhand ? 'u' : 'x') +
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308 | ('0000' + hexadecimal).slice(longhand ? -4 : -2);
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309 | result += escaped;
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310 | continue;
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311 | }
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312 | if (options.wrap) {
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313 | result = quote + result + quote;
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314 | }
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315 | if (quote == '`') {
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316 | result = result.replace(/\$\{/g, '\\\$\{');
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317 | }
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318 | if (options.isScriptContext) {
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319 | // https://mathiasbynens.be/notes/etago
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320 | return result
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321 | .replace(/<\/(script|style)/gi, '<\\/$1')
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322 | .replace(/<!--/g, json ? '\\u003C!--' : '\\x3C!--');
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323 | }
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324 | return result;
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325 | };
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326 |
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327 | jsesc.version = '2.5.2';
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328 |
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329 | module.exports = jsesc;
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