source: node_modules/css.escape/css.escape.js@ 65b6638

/*! 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;

}));