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'use strict'; /** * Can unquote attribute detection from mothereff.in * Copyright Mathias Bynens
* https://github.com/mathiasbynens/mothereff.in */ const escapes = /\\([0-9A-Fa-f]{1,6})[ \t\n\f\r]?/g; const range = // eslint-disable-next-line no-control-regex /[\u0000-\u002c\u002e\u002f\u003A-\u0040\u005B-\u005E\u0060\u007B-\u009f]/; /** * @param {string} value * @return {boolean} */ module.exports = function canUnquote(value) { if (value === '-' || value === '') { return false; } value = value.replace(escapes, 'a').replace(/\\./g, 'a'); return !(range.test(value) || /^(?:-?\d|--)/.test(value)); };