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