/*
DO NOT TOUCH THIS FILE DIRECTLY. See the README for instructions.

Copyright Mathias Bynens <https://mathiasbynens.be/>

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

var global = {};

/*! https://mths.be/jsesc v1.0.0 by @mathias */
;(function(root) {

	// Detect free variables `exports`
	var freeExports = typeof exports == 'object' && exports;

	// Detect free variable `module`
	var freeModule = typeof module == 'object' && module &&
		module.exports == freeExports && module;

	// Detect free variable `global`, from Node.js or Browserified code,
	// and use it as `root`
	var freeGlobal = typeof global == 'object' && global;
	if (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal) {
		root = freeGlobal;
	}

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

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

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

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

	var toString = object.toString;
	var isArray = function(value) {
		return toString.call(value) == '[object Array]';
	};
	var isObject = function(value) {
		// This is a very simple check, but it’s good enough for what we need.
		return toString.call(value) == '[object Object]';
	};
	var isString = function(value) {
		return typeof value == 'string' ||
			toString.call(value) == '[object String]';
	};
	var isFunction = function(value) {
		// In a perfect world, the `typeof` check would be sufficient. However,
		// in Chrome 1–12, `typeof /x/ == 'object'`, and in IE 6–8
		// `typeof alert == 'object'` and similar for other host objects.
		return typeof value == 'function' ||
			toString.call(value) == '[object Function]';
	};

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

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

	var regexDigit = /[0-9]/;
	var regexWhitelist = /[ !#-&\(-\[\]-~]/;

	var jsesc = function(argument, options) {
		// Handle options
		var defaults = {
			'escapeEverything': false,
			'quotes': 'single',
			'wrap': false,
			'es6': false,
			'json': false,
			'compact': true,
			'lowercaseHex': false,
			'indent': '\t',
			'__indent__': ''
		};
		var 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 = 'single';
		}
		var quote = options.quotes == 'double' ? '"' : '\'';
		var compact = options.compact;
		var indent = options.indent;
		var oldIndent;
		var newLine = compact ? '' : '\n';
		var result;
		var isEmpty = true;

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

		if (!isString(argument)) {
			if (isArray(argument)) {
				result = [];
				options.wrap = true;
				oldIndent = options.__indent__;
				indent += oldIndent;
				options.__indent__ = indent;
				forEach(argument, function(value) {
					isEmpty = false;
					result.push(
						(compact ? '' : indent) +
						jsesc(value, options)
					);
				});
				if (isEmpty) {
					return '[]';
				}
				return '[' + newLine + result.join(',' + newLine) + newLine +
					(compact ? '' : oldIndent) + ']';
			} 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;
				oldIndent = options.__indent__;
				indent += oldIndent;
				options.__indent__ = indent;
				forOwn(argument, function(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) + '}';
			}
		}

		var string = argument;
		// Loop over each code unit in the string and escape it
		var index = -1;
		var length = string.length;
		var first;
		var second;
		var codePoint;
		result = '';
		while (++index < length) {
			var character = string.charAt(index);
			if (options.es6) {
				first = string.charCodeAt(index);
				if ( // check if it’s the start of a surrogate pair
					first >= 0xD800 && first <= 0xDBFF && // high surrogate
					length > index + 1 // there is a next code unit
				) {
					second = string.charCodeAt(index + 1);
					if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate
						// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
						codePoint = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
						var hexadecimal = codePoint.toString(16);
						if (!options.lowercaseHex) {
							hexadecimal = hexadecimal.toUpperCase();
						}
						result += '\\u{' + hexadecimal + '}';
						index++;
						continue;
					}
				}
			}
			if (!options.escapeEverything) {
				if (regexWhitelist.test(character)) {
					// It’s a printable ASCII character that is not `"`, `'` or `\`,
					// so don’t escape it.
					result += character;
					continue;
				}
				if (character == '"') {
					result += quote == character ? '\\"' : character;
					continue;
				}
				if (character == '\'') {
					result += quote == character ? '\\\'' : character;
					continue;
				}
			}
			if (
				character == '\0' &&
				!json &&
				!regexDigit.test(string.charAt(index + 1))
			) {
				result += '\\0';
				continue;
			}
			if (regexSingleEscape.test(character)) {
				// no need for a `hasOwnProperty` check here
				result += singleEscapes[character];
				continue;
			}
			var charCode = character.charCodeAt(0);
			var hexadecimal = charCode.toString(16);
			if (!options.lowercaseHex) {
				hexadecimal = hexadecimal.toUpperCase();
			}
			var longhand = hexadecimal.length > 2 || json;
			var escaped = '\\' + (longhand ? 'u' : 'x') +
				('0000' + hexadecimal).slice(longhand ? -4 : -2);
			result += escaped;
			continue;
		}
		if (options.wrap) {
			result = quote + result + quote;
		}
		return result;
	};

	jsesc.version = '1.0.0';

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

	// Some AMD build optimizers, like r.js, check for specific condition patterns
	// like the following:
	if (
		typeof define == 'function' &&
		typeof define.amd == 'object' &&
		define.amd
	) {
		define(function() {
			return jsesc;
		});
	}	else if (freeExports && !freeExports.nodeType) {
		if (freeModule) { // in Node.js or RingoJS v0.8.0+
			freeModule.exports = jsesc;
		} else { // in Narwhal or RingoJS v0.7.0-
			freeExports.jsesc = jsesc;
		}
	} else { // in Rhino or a web browser
		root.jsesc = jsesc;
	}

}(global));

export var jsesc = global.jsesc;
