/**
   * @fileoverview CheckStyle XML reporter
   * @author Ian Christian Myers
   */
  "use strict";
  
  //------------------------------------------------------------------------------
  // Helper Functions
  //------------------------------------------------------------------------------
  
  /**
   * Returns the severity of warning or error
   * @param {object} message message object to examine
   * @returns {string} severity level
   * @private
   */
  function getMessageType(message) {
      if (message.fatal || message.severity === 2) {
          return "error";
      } else {
          return "warning";
      }
  }
  
  /**
   * Returns the escaped value for a character
   * @param {string} s string to examine
   * @returns {string} severity level
   * @private
   */
  function xmlEscape(s) {
      return ("" + s).replace(/[<>&"']/g, function(c) {
          switch (c) {
              case "<":
                  return "&lt;";
              case ">":
                  return "&gt;";
              case "&":
                  return "&amp;";
              case "\"":
                  return "&quot;";
              case "'":
                  return "&apos;";
              // no default
          }
      });
  }
  
  //------------------------------------------------------------------------------
  // Public Interface
  //------------------------------------------------------------------------------
  
  module.exports = function(results) {
  
      var output = "";
  
      output += "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
      output += "<checkstyle version=\"4.3\">";
  
      results.forEach(function(result) {
          var messages = result.messages;
  
          output += "<file name=\"" + xmlEscape(result.filePath) + "\">";
  
          messages.forEach(function(message) {
              output += "<error line=\"" + xmlEscape(message.line) + "\" " +
                  "column=\"" + xmlEscape(message.column) + "\" " +
                  "severity=\"" + xmlEscape(getMessageType(message)) + "\" " +
                  "message=\"" + xmlEscape(message.message) +
                  (message.ruleId ? " (" + message.ruleId + ")" : "") + "\" " +
                  "source=\"" + (message.ruleId ? xmlEscape("eslint.rules." + message.ruleId) : "") + "\" />";
          });
  
          output += "</file>";
  
      });
  
      output += "</checkstyle>";
  
      return output;
  };