46 lines
1.7 KiB
JavaScript
Executable file
46 lines
1.7 KiB
JavaScript
Executable file
var $ = require('../internals/export');
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var global = require('../internals/global');
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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 uncurryThis = require('../internals/function-uncurry-this');
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var fails = require('../internals/fails');
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var Array = global.Array;
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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 fix = 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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var FORCED = fails(function () {
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return $stringify('\uDF06\uD834') !== '"\\udf06\\ud834"'
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|| $stringify('\uDEAD') !== '"\\udead"';
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});
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if ($stringify) {
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// `JSON.stringify` method
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// https://tc39.es/ecma262/#sec-json.stringify
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// https://github.com/tc39/proposal-well-formed-stringify
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$({ target: 'JSON', stat: true, forced: FORCED }, {
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// eslint-disable-next-line no-unused-vars -- required for `.length`
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stringify: function stringify(it, replacer, space) {
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for (var i = 0, l = arguments.length, args = Array(l); i < l; i++) args[i] = arguments[i];
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var result = apply($stringify, null, args);
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return typeof result == 'string' ? replace(result, tester, fix) : result;
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}
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});
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}
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