<?php
/*
copyright Massimiliano Rossetti www.mrossetti.it ALL RIGHTS RESERVED
Version 0.1 ALPHA
Posted @ http://www.w3tools.info/2011/09/w3c-validator.html
*/
class W3cValidator extends CurlObj {

    private $link;//link che va validato
    private $xml;//xml ritornato dalla verifica richiesta

    public function __construct() {//inizializzo le proprietà di default
        parent::__construct();
    }

    private function set_link($url) {
        $this->link = 'http://validator.w3.org/check?url='.$url.'&output=soap12';
    }

    private function _validate($url, $mod = NULL) {
        $this->set_link($url);
        if($mod == 'fast') {
            $this->http_header($this->link, '');
        }elseif($mod == 'full') {
            $this->http_get_withheader($this->link, '');
        } else {//validazione predefinita
            $this->http_get($this->link, '');
        }
        if($this->curl_info['http_code'] == 200) {
            return true;
        }
        return false;
    }


    /*questi metodi ritornano un array con vari parametri a seconda del tipo richiesto*/


    /* ritorna un array come fast validate ma completo degli errori presenti nella risposta xml */
    public function validate($url) {
        if($this->_validate($url)) {
            return $this->xml_parsing($this->get_curl_output());
        }
        return false;
    }

    //ritorna un array con i contenuti dell'header fornito
    public function fast_validate($url) {
        if($this->_validate($url, 'fast')) {
             return $this->header_parsing($this->get_curl_output());
        }
        return false;
    }

    /**/
    public function full_validate($url) {
        $this->_validate($url, 'full');
    }


    private function header_parsing($string) {
        $tmp_arr = explode("\n", trim($string));
        if(count($tmp_arr)) {
            $result_arr = array();
            foreach($tmp_arr as $str_value) {
                if(strstr($str_value, 'X-W3C-Validator-Status:')) {
                $result_arr['status'] = strtolower(trim(str_replace('X-W3C-Validator-Status:', '', $str_value)));
                }
                if(strstr($str_value, 'X-W3C-Validator-Errors:')) {
                $result_arr['err_num'] = intval(trim(str_replace('X-W3C-Validator-Errors:', '', $str_value)));
                }
                if(strstr($str_value, 'X-W3C-Validator-Warnings:')) {
                $result_arr['warn_num'] = intval(trim(str_replace('X-W3C-Validator-Warnings:', '', $str_value)));
                }

            }
            unset($tmp_arr);
            return $result_arr;
        }
        return false;
    }


    private function xml_parsing($string) {

        $result_arr = array();
        $xml = new DomDocument();
        @$xml->loadXML($string);
        $xpath = new DOMXpath($xml);
        $xpath->registerNamespace("m", "http://www.w3.org/2005/10/markup-validator");


        $elements = $xpath->query("//m:validity");
        if($elements->item(0)->nodeValue == 'true') {
            $result_arr['status'] = 'valid';
        }else {
            $result_arr['status'] = 'invalid';
        }

        $elements = $xpath->query("//m:errorcount");
        $result_arr['err_num'] = intval($elements->item(0)->nodeValue);



        $result_arr['errors'] = array();
        $result_arr['warnings'] = array();

        if($elements->item(0) && $elements->item(0)->nodeValue > 0) {

          $node_arr = $xpath->query("//m:errors/m:errorlist/m:error/m:line");
          $i = 0;
          foreach ($node_arr as $node) {
              $result_arr['errors'][$i]['line'] = intval($node->nodeValue);
              $i++;
          }

          $node_arr = $xpath->query("//m:errors/m:errorlist/m:error/m:col");
          $i = 0;
          foreach ($node_arr as $node) {
              $result_arr['errors'][$i]['col'] = intval($node->nodeValue);
              $i++;
          }

          $node_arr = $xpath->query("//m:errors/m:errorlist/m:error/m:message");
          $i = 0;
          foreach ($node_arr as $node) {
              $result_arr['errors'][$i]['message'] = $node->nodeValue;
              $i++;
          }
          $node_arr = $xpath->query("//m:errors/m:errorlist/m:error/m:messageid");
           $i = 0;
          foreach ($node_arr as $node) {
              $result_arr['errors'][$i]['messageid'] = $node->nodeValue;
              $i++;
          }
          $node_arr = $xpath->query("//m:errors/m:errorlist/m:error/m:explanation");
           $i = 0;
          foreach ($node_arr as $node) {
              $result_arr['errors'][$i]['explanation'] = trim($node->nodeValue);
              $i++;
          }
        }

        $elements = $xpath->query("//m:warningcount");
        $result_arr['warn_num'] = intval($elements->item(0)->nodeValue);

        if($elements->item(0) && $elements->item(0)->nodeValue > 0) {
          $node_arr = $xpath->query("//m:warnings/m:warninglist/m:warning/m:messageid");
          $i = 0;
          foreach ($node_arr as $node) {
              $result_arr['warnings'][$i]['messageid'] = trim($node->nodeValue);
              $i++;
          }
          $node_arr = $xpath->query("//m:warnings/m:warninglist/m:warning/m:message");
          $i = 0;
          foreach ($node_arr as $node) {
              $result_arr['warnings'][$i]['message'] = trim($node->nodeValue);
              $i++;
          }

        }


        return $result_arr;
    }

    public function isValid($url) {//ritorna true o false
        $result = $this->fast_validate($url);
        if(is_array($result) && $result['status'] == 'valid') {
            return true;
        }
        return false;
        //http_code
    }

    public function return_xml_string($url) {

    }

    public function get_ErrNum() {//ritorna il numero degli errori presenti nella pagina
    }
}

?>