source: trip-planner-front/node_modules/cssesc/cssesc.js@ e29cc2e

/*! https://mths.be/cssesc v3.0.0 by @mathias */
'use strict';

var object = {};
var hasOwnProperty = object.hasOwnProperty;
var merge = function merge(options, defaults) {
        if (!options) {
                return defaults;
        }
        var result = {};
        for (var key in defaults) {
                // `if (defaults.hasOwnProperty(key) { … }` is not needed here, since
                // only recognized option names are used.
                result[key] = hasOwnProperty.call(options, key) ? options[key] : defaults[key];
        }
        return result;
};

var regexAnySingleEscape = /[ -,\.\/:-@\[-\^`\{-~]/;
var regexSingleEscape = /[ -,\.\/:-@\[\]\^`\{-~]/;
var regexAlwaysEscape = /['"\\]/;
var regexExcessiveSpaces = /(^|\\+)?(\\[A-F0-9]{1,6})\x20(?![a-fA-F0-9\x20])/g;

// https://mathiasbynens.be/notes/css-escapes#css
var cssesc = function cssesc(string, options) {
        options = merge(options, cssesc.options);
        if (options.quotes != 'single' && options.quotes != 'double') {
                options.quotes = 'single';
        }
        var quote = options.quotes == 'double' ? '"' : '\'';
        var isIdentifier = options.isIdentifier;

        var firstChar = string.charAt(0);
        var output = '';
        var counter = 0;
        var length = string.length;
        while (counter < length) {
                var character = string.charAt(counter++);
                var codePoint = character.charCodeAt();
                var value = void 0;
                // If it’s not a printable ASCII character…
                if (codePoint < 0x20 || codePoint > 0x7E) {
                        if (codePoint >= 0xD800 && codePoint <= 0xDBFF && counter < length) {
                                // It’s a high surrogate, and there is a next character.
                                var extra = string.charCodeAt(counter++);
                                if ((extra & 0xFC00) == 0xDC00) {
                                        // next character is low surrogate
                                        codePoint = ((codePoint & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000;
                                } else {
                                        // It’s an unmatched surrogate; only append this code unit, in case
                                        // the next code unit is the high surrogate of a surrogate pair.
                                        counter--;
                                }
                        }
                        value = '\\' + codePoint.toString(16).toUpperCase() + ' ';
                } else {
                        if (options.escapeEverything) {
                                if (regexAnySingleEscape.test(character)) {
                                        value = '\\' + character;
                                } else {
                                        value = '\\' + codePoint.toString(16).toUpperCase() + ' ';
                                }
                        } else if (/[\t\n\f\r\x0B]/.test(character)) {
                                value = '\\' + codePoint.toString(16).toUpperCase() + ' ';
                        } else if (character == '\\' || !isIdentifier && (character == '"' && quote == character || character == '\'' && quote == character) || isIdentifier && regexSingleEscape.test(character)) {
                                value = '\\' + character;
                        } else {
                                value = character;
                        }
                }
                output += value;
        }

        if (isIdentifier) {
                if (/^-[-\d]/.test(output)) {
                        output = '\\-' + output.slice(1);
                } else if (/\d/.test(firstChar)) {
                        output = '\\3' + firstChar + ' ' + output.slice(1);
                }
        }

        // Remove spaces after `\HEX` escapes that are not followed by a hex digit,
        // since they’re redundant. Note that this is only possible if the escape
        // sequence isn’t preceded by an odd number of backslashes.
        output = output.replace(regexExcessiveSpaces, function ($0, $1, $2) {
                if ($1 && $1.length % 2) {
                        // It’s not safe to remove the space, so don’t.
                        return $0;
                }
                // Strip the space.
                return ($1 || '') + $2;
        });

        if (!isIdentifier && options.wrap) {
                return quote + output + quote;
        }
        return output;
};

// Expose default options (so they can be overridden globally).
cssesc.options = {
        'escapeEverything': false,
        'isIdentifier': false,
        'quotes': 'single',
        'wrap': false
};

cssesc.version = '3.0.0';

module.exports = cssesc;