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Filename : css.escape.js
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/*! https://mths.be/cssescape v1.5.1 by @mathias | MIT license */
;(function(root, factory) {
	// https://github.com/umdjs/umd/blob/master/returnExports.js
	if (typeof exports == 'object') {
		// For Node.js.
		module.exports = factory(root);
	} else if (typeof define == 'function' && define.amd) {
		// For AMD. Register as an anonymous module.
		define([], factory.bind(root, root));
	} else {
		// For browser globals (not exposing the function separately).
		factory(root);
	}
}(typeof global != 'undefined' ? global : this, function(root) {

	if (root.CSS && root.CSS.escape) {
		return root.CSS.escape;
	}

	// https://drafts.csswg.org/cssom/#serialize-an-identifier
	var cssEscape = function(value) {
		if (arguments.length == 0) {
			throw new TypeError('`CSS.escape` requires an argument.');
		}
		var string = String(value);
		var length = string.length;
		var index = -1;
		var codeUnit;
		var result = '';
		var firstCodeUnit = string.charCodeAt(0);
		while (++index < length) {
			codeUnit = string.charCodeAt(index);
			// Note: there’s no need to special-case astral symbols, surrogate
			// pairs, or lone surrogates.

			// If the character is NULL (U+0000), then the REPLACEMENT CHARACTER
			// (U+FFFD).
			if (codeUnit == 0x0000) {
				result += '\uFFFD';
				continue;
			}

			if (
				// If the character is in the range [\1-\1F] (U+0001 to U+001F) or is
				// U+007F, […]
				(codeUnit >= 0x0001 && codeUnit <= 0x001F) || codeUnit == 0x007F ||
				// If the character is the first character and is in the range [0-9]
				// (U+0030 to U+0039), […]
				(index == 0 && codeUnit >= 0x0030 && codeUnit <= 0x0039) ||
				// If the character is the second character and is in the range [0-9]
				// (U+0030 to U+0039) and the first character is a `-` (U+002D), […]
				(
					index == 1 &&
					codeUnit >= 0x0030 && codeUnit <= 0x0039 &&
					firstCodeUnit == 0x002D
				)
			) {
				// https://drafts.csswg.org/cssom/#escape-a-character-as-code-point
				result += '\\' + codeUnit.toString(16) + ' ';
				continue;
			}

			if (
				// If the character is the first character and is a `-` (U+002D), and
				// there is no second character, […]
				index == 0 &&
				length == 1 &&
				codeUnit == 0x002D
			) {
				result += '\\' + string.charAt(index);
				continue;
			}

			// If the character is not handled by one of the above rules and is
			// greater than or equal to U+0080, is `-` (U+002D) or `_` (U+005F), or
			// is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to
			// U+005A), or [a-z] (U+0061 to U+007A), […]
			if (
				codeUnit >= 0x0080 ||
				codeUnit == 0x002D ||
				codeUnit == 0x005F ||
				codeUnit >= 0x0030 && codeUnit <= 0x0039 ||
				codeUnit >= 0x0041 && codeUnit <= 0x005A ||
				codeUnit >= 0x0061 && codeUnit <= 0x007A
			) {
				// the character itself
				result += string.charAt(index);
				continue;
			}

			// Otherwise, the escaped character.
			// https://drafts.csswg.org/cssom/#escape-a-character
			result += '\\' + string.charAt(index);

		}
		return result;
	};

	if (!root.CSS) {
		root.CSS = {};
	}

	root.CSS.escape = cssEscape;
	return cssEscape;

}));