| 1 | ;
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| 2 | /**
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| 3 | * Can unquote attribute detection from mothereff.in
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| 4 | * Copyright Mathias Bynens <https://mathiasbynens.be/>
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| 5 | * https://github.com/mathiasbynens/mothereff.in
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| 6 | */
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| 7 | const escapes = /\\([0-9A-Fa-f]{1,6})[ \t\n\f\r]?/g;
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| 8 | const range =
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| 9 | // eslint-disable-next-line no-control-regex
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| 10 | /[\u0000-\u002c\u002e\u002f\u003A-\u0040\u005B-\u005E\u0060\u007B-\u009f]/;
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| 11 |
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| 12 | /**
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| 13 | * @param {string} value
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| 14 | * @return {boolean}
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| 15 | */
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| 16 | module.exports = function canUnquote(value) {
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| 17 | if (value === '-' || value === '') {
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| 18 | return false;
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| 19 | }
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| 20 |
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| 21 | value = value.replace(escapes, 'a').replace(/\\./g, 'a');
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| 22 |
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| 23 | return !(range.test(value) || /^(?:-?\d|--)/.test(value));
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| 24 | };
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