var safe = require('safe-regex');
/**
 * Check if the regex is evil or not using the safe-regex module
 * @author Adam Baldwin
 */

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

module.exports = function(context) {

    "use strict";

    return {
        "Literal": function(node) {
            var token = context.getTokens(node)[0],
                nodeType = token.type,
                nodeValue = token.value;

            if (nodeType === "RegularExpression") {
                if (!safe(nodeValue)) {
                    context.report(node, "Unsafe Regular Expression");
                }
            }
        },
        "NewExpression": function(node) {
            if (node.callee.name == "RegExp" && node.arguments && node.arguments.length > 0 && node.arguments[0].type == "Literal") {
                if (!safe(node.arguments[0].value)) {
                    context.report(node, "Unsafe Regular Expression (new RegExp)");
                }
            }
        }
    };

};