'use strict';
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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 isCallable = require('../internals/is-callable');
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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 getReplacerFunction = require('../internals/get-json-replacer-function');
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var NATIVE_SYMBOL = require('../internals/symbol-constructor-detection');
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var $String = String;
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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')('stringify detection');
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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 $replacer = getReplacerFunction(replacer);
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if (!isCallable($replacer) && (it === undefined || isSymbol(it))) return; // IE8 returns string on undefined
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args[1] = function (key, value) {
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// some old implementations (like WebKit) could pass numbers as keys
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if (isCallable($replacer)) value = call($replacer, this, $String(key), value);
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if (!isSymbol(value)) return value;
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};
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return apply($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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