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72 lines
2.9 KiB
72 lines
2.9 KiB
var $ = require('../internals/export'); |
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var getBuiltIn = require('../internals/get-built-in'); |
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var apply = require('../internals/function-apply'); |
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var call = require('../internals/function-call'); |
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var uncurryThis = require('../internals/function-uncurry-this'); |
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var fails = require('../internals/fails'); |
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var isArray = require('../internals/is-array'); |
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var isCallable = require('../internals/is-callable'); |
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var isObject = require('../internals/is-object'); |
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var isSymbol = require('../internals/is-symbol'); |
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var arraySlice = require('../internals/array-slice'); |
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var NATIVE_SYMBOL = require('../internals/native-symbol'); |
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var $stringify = getBuiltIn('JSON', 'stringify'); |
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var exec = uncurryThis(/./.exec); |
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var charAt = uncurryThis(''.charAt); |
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var charCodeAt = uncurryThis(''.charCodeAt); |
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var replace = uncurryThis(''.replace); |
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var numberToString = uncurryThis(1.0.toString); |
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var tester = /[\uD800-\uDFFF]/g; |
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var low = /^[\uD800-\uDBFF]$/; |
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var hi = /^[\uDC00-\uDFFF]$/; |
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var WRONG_SYMBOLS_CONVERSION = !NATIVE_SYMBOL || fails(function () { |
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var symbol = getBuiltIn('Symbol')(); |
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// MS Edge converts symbol values to JSON as {} |
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return $stringify([symbol]) != '[null]' |
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// WebKit converts symbol values to JSON as null |
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|| $stringify({ a: symbol }) != '{}' |
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// V8 throws on boxed symbols |
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|| $stringify(Object(symbol)) != '{}'; |
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}); |
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// https://github.com/tc39/proposal-well-formed-stringify |
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var ILL_FORMED_UNICODE = fails(function () { |
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return $stringify('\uDF06\uD834') !== '"\\udf06\\ud834"' |
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|| $stringify('\uDEAD') !== '"\\udead"'; |
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}); |
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var stringifyWithSymbolsFix = function (it, replacer) { |
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var args = arraySlice(arguments); |
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var $replacer = replacer; |
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if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined |
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if (!isArray(replacer)) replacer = function (key, value) { |
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if (isCallable($replacer)) value = call($replacer, this, key, value); |
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if (!isSymbol(value)) return value; |
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}; |
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args[1] = replacer; |
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return apply($stringify, null, args); |
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}; |
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var fixIllFormed = function (match, offset, string) { |
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var prev = charAt(string, offset - 1); |
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var next = charAt(string, offset + 1); |
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if ((exec(low, match) && !exec(hi, next)) || (exec(hi, match) && !exec(low, prev))) { |
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return '\\u' + numberToString(charCodeAt(match, 0), 16); |
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} return match; |
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}; |
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if ($stringify) { |
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// `JSON.stringify` method |
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// https://tc39.es/ecma262/#sec-json.stringify |
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$({ target: 'JSON', stat: true, arity: 3, forced: WRONG_SYMBOLS_CONVERSION || ILL_FORMED_UNICODE }, { |
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// eslint-disable-next-line no-unused-vars -- required for `.length` |
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stringify: function stringify(it, replacer, space) { |
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var args = arraySlice(arguments); |
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var result = apply(WRONG_SYMBOLS_CONVERSION ? stringifyWithSymbolsFix : $stringify, null, args); |
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return ILL_FORMED_UNICODE && typeof result == 'string' ? replace(result, tester, fixIllFormed) : result; |
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} |
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}); |
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}
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