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