source: imaps-frontend/node_modules/jsesc/jsesc.js@ 0c6b92a

'use strict';

const object = {};
const hasOwnProperty = object.hasOwnProperty;
const forOwn = (object, callback) => {
        for (const key in object) {
                if (hasOwnProperty.call(object, key)) {
                        callback(key, object[key]);
                }
        }
};

const extend = (destination, source) => {
        if (!source) {
                return destination;
        }
        forOwn(source, (key, value) => {
                destination[key] = value;
        });
        return destination;
};

const forEach = (array, callback) => {
        const length = array.length;
        let index = -1;
        while (++index < length) {
                callback(array[index]);
        }
};

const fourHexEscape = (hex) => {
        return '\\u' + ('0000' + hex).slice(-4);
}

const hexadecimal = (code, lowercase) => {
        let hexadecimal = code.toString(16);
        if (lowercase) return hexadecimal;
        return hexadecimal.toUpperCase();
};

const toString = object.toString;
const isArray = Array.isArray;
const isBuffer = (value) => {
        return typeof Buffer === 'function' && Buffer.isBuffer(value);
};
const isObject = (value) => {
        // This is a very simple check, but it’s good enough for what we need.
        return toString.call(value) == '[object Object]';
};
const isString = (value) => {
        return typeof value == 'string' ||
                toString.call(value) == '[object String]';
};
const isNumber = (value) => {
        return typeof value == 'number' ||
                toString.call(value) == '[object Number]';
};
const isFunction = (value) => {
        return typeof value == 'function';
};
const isMap = (value) => {
        return toString.call(value) == '[object Map]';
};
const isSet = (value) => {
        return toString.call(value) == '[object Set]';
};

/*--------------------------------------------------------------------------*/

// https://mathiasbynens.be/notes/javascript-escapes#single
const singleEscapes = {
        '\\': '\\\\',
        '\b': '\\b',
        '\f': '\\f',
        '\n': '\\n',
        '\r': '\\r',
        '\t': '\\t'
        // `\v` is omitted intentionally, because in IE < 9, '\v' == 'v'.
        // '\v': '\\x0B'
};
const regexSingleEscape = /[\\\b\f\n\r\t]/;

const regexDigit = /[0-9]/;
const regexWhitespace = /[\xA0\u1680\u2000-\u200A\u2028\u2029\u202F\u205F\u3000]/;

const escapeEverythingRegex = /([\uD800-\uDBFF][\uDC00-\uDFFF])|([\uD800-\uDFFF])|(['"`])|[^]/g;
const escapeNonAsciiRegex = /([\uD800-\uDBFF][\uDC00-\uDFFF])|([\uD800-\uDFFF])|(['"`])|[^ !#-&\(-\[\]-_a-~]/g;

const jsesc = (argument, options) => {
        const increaseIndentation = () => {
                oldIndent = indent;
                ++options.indentLevel;
                indent = options.indent.repeat(options.indentLevel)
        };
        // Handle options
        const defaults = {
                'escapeEverything': false,
                'minimal': false,
                'isScriptContext': false,
                'quotes': 'single',
                'wrap': false,
                'es6': false,
                'json': false,
                'compact': true,
                'lowercaseHex': false,
                'numbers': 'decimal',
                'indent': '\t',
                'indentLevel': 0,
                '__inline1__': false,
                '__inline2__': false
        };
        const json = options && options.json;
        if (json) {
                defaults.quotes = 'double';
                defaults.wrap = true;
        }
        options = extend(defaults, options);
        if (
                options.quotes != 'single' &&
                options.quotes != 'double' &&
                options.quotes != 'backtick'
        ) {
                options.quotes = 'single';
        }
        const quote = options.quotes == 'double' ?
                '"' :
                (options.quotes == 'backtick' ?
                        '`' :
                        '\''
                );
        const compact = options.compact;
        const lowercaseHex = options.lowercaseHex;
        let indent = options.indent.repeat(options.indentLevel);
        let oldIndent = '';
        const inline1 = options.__inline1__;
        const inline2 = options.__inline2__;
        const newLine = compact ? '' : '\n';
        let result;
        let isEmpty = true;
        const useBinNumbers = options.numbers == 'binary';
        const useOctNumbers = options.numbers == 'octal';
        const useDecNumbers = options.numbers == 'decimal';
        const useHexNumbers = options.numbers == 'hexadecimal';

        if (json && argument && isFunction(argument.toJSON)) {
                argument = argument.toJSON();
        }

        if (!isString(argument)) {
                if (isMap(argument)) {
                        if (argument.size == 0) {
                                return 'new Map()';
                        }
                        if (!compact) {
                                options.__inline1__ = true;
                                options.__inline2__ = false;
                        }
                        return 'new Map(' + jsesc(Array.from(argument), options) + ')';
                }
                if (isSet(argument)) {
                        if (argument.size == 0) {
                                return 'new Set()';
                        }
                        return 'new Set(' + jsesc(Array.from(argument), options) + ')';
                }
                if (isBuffer(argument)) {
                        if (argument.length == 0) {
                                return 'Buffer.from([])';
                        }
                        return 'Buffer.from(' + jsesc(Array.from(argument), options) + ')';
                }
                if (isArray(argument)) {
                        result = [];
                        options.wrap = true;
                        if (inline1) {
                                options.__inline1__ = false;
                                options.__inline2__ = true;
                        }
                        if (!inline2) {
                                increaseIndentation();
                        }
                        forEach(argument, (value) => {
                                isEmpty = false;
                                if (inline2) {
                                        options.__inline2__ = false;
                                }
                                result.push(
                                        (compact || inline2 ? '' : indent) +
                                        jsesc(value, options)
                                );
                        });
                        if (isEmpty) {
                                return '[]';
                        }
                        if (inline2) {
                                return '[' + result.join(', ') + ']';
                        }
                        return '[' + newLine + result.join(',' + newLine) + newLine +
                                (compact ? '' : oldIndent) + ']';
                } else if (isNumber(argument)) {
                        if (json) {
                                // Some number values (e.g. `Infinity`) cannot be represented in JSON.
                                return JSON.stringify(argument);
                        }
                        if (useDecNumbers) {
                                return String(argument);
                        }
                        if (useHexNumbers) {
                                let hexadecimal = argument.toString(16);
                                if (!lowercaseHex) {
                                        hexadecimal = hexadecimal.toUpperCase();
                                }
                                return '0x' + hexadecimal;
                        }
                        if (useBinNumbers) {
                                return '0b' + argument.toString(2);
                        }
                        if (useOctNumbers) {
                                return '0o' + argument.toString(8);
                        }
                } else if (!isObject(argument)) {
                        if (json) {
                                // For some values (e.g. `undefined`, `function` objects),
                                // `JSON.stringify(value)` returns `undefined` (which isn’t valid
                                // JSON) instead of `'null'`.
                                return JSON.stringify(argument) || 'null';
                        }
                        return String(argument);
                } else { // it’s an object
                        result = [];
                        options.wrap = true;
                        increaseIndentation();
                        forOwn(argument, (key, value) => {
                                isEmpty = false;
                                result.push(
                                        (compact ? '' : indent) +
                                        jsesc(key, options) + ':' +
                                        (compact ? '' : ' ') +
                                        jsesc(value, options)
                                );
                        });
                        if (isEmpty) {
                                return '{}';
                        }
                        return '{' + newLine + result.join(',' + newLine) + newLine +
                                (compact ? '' : oldIndent) + '}';
                }
        }

        const regex = options.escapeEverything ? escapeEverythingRegex : escapeNonAsciiRegex;
        result = argument.replace(regex, (char, pair, lone, quoteChar, index, string) => {
                if (pair) {
                        if (options.minimal) return pair;
                        const first = pair.charCodeAt(0);
                        const second = pair.charCodeAt(1);
                        if (options.es6) {
                                // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
                                const codePoint = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
                                const hex = hexadecimal(codePoint, lowercaseHex);
                                return '\\u{' + hex + '}';
                        }
                        return fourHexEscape(hexadecimal(first, lowercaseHex)) + fourHexEscape(hexadecimal(second, lowercaseHex));
                }

                if (lone) {
                        return fourHexEscape(hexadecimal(lone.charCodeAt(0), lowercaseHex));
                }

                if (
                        char == '\0' &&
                        !json &&
                        !regexDigit.test(string.charAt(index + 1))
                ) {
                        return '\\0';
                }

                if (quoteChar) {
                        if (quoteChar == quote || options.escapeEverything) {
                                return '\\' + quoteChar;
                        }
                        return quoteChar;
                }

                if (regexSingleEscape.test(char)) {
                        // no need for a `hasOwnProperty` check here
                        return singleEscapes[char];
                }

                if (options.minimal && !regexWhitespace.test(char)) {
                        return char;
                }

                const hex = hexadecimal(char.charCodeAt(0), lowercaseHex);
                if (json || hex.length > 2) {
                        return fourHexEscape(hex);
                }

                return '\\x' + ('00' + hex).slice(-2);
        });

        if (quote == '`') {
                result = result.replace(/\$\{/g, '\\${');
        }
        if (options.isScriptContext) {
                // https://mathiasbynens.be/notes/etago
                result = result
                        .replace(/<\/(script|style)/gi, '<\\/$1')
                        .replace(/<!--/g, json ? '\\u003C!--' : '\\x3C!--');
        }
        if (options.wrap) {
                result = quote + result + quote;
        }
        return result;
};

jsesc.version = '3.0.2';

module.exports = jsesc;