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'use strict';
var singleComment = 1;
var multiComment = 2;

function stripWithoutWhitespace() {
	return '';
}

function stripWithWhitespace(str, start, end) {
	return str.slice(start, end).replace(/\S/g, ' ');
}

module.exports = function (str, opts) {
	opts = opts || {};

	var currentChar;
	var nextChar;
	var insideString = false;
	var insideComment = false;
	var offset = 0;
	var ret = '';
	var strip = opts.whitespace === false ? stripWithoutWhitespace : stripWithWhitespace;

	for (var i = 0; i < str.length; i++) {
		currentChar = str[i];
		nextChar = str[i + 1];

		if (!insideComment && currentChar === '"') {
			var escaped = str[i - 1] === '\\' && str[i - 2] !== '\\';
			if (!escaped) {
				insideString = !insideString;
			}
		}

		if (insideString) {
			continue;
		}

		if (!insideComment && currentChar + nextChar === '//') {
			ret += str.slice(offset, i);
			offset = i;
			insideComment = singleComment;
			i++;
		} else if (insideComment === singleComment && currentChar + nextChar === '\r\n') {
			i++;
			insideComment = false;
			ret += strip(str, offset, i);
			offset = i;
			continue;
		} else if (insideComment === singleComment && currentChar === '\n') {
			insideComment = false;
			ret += strip(str, offset, i);
			offset = i;
		} else if (!insideComment && currentChar + nextChar === '/*') {
			ret += str.slice(offset, i);
			offset = i;
			insideComment = multiComment;
			i++;
			continue;
		} else if (insideComment === multiComment && currentChar + nextChar === '*/') {
			i++;
			insideComment = false;
			ret += strip(str, offset, i + 1);
			offset = i + 1;
			continue;
		}
	}

	return ret + (insideComment ? strip(str.substr(offset)) : str.substr(offset));
};