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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Code for parsing xml files.
*
* Handles functionality for:
*
* Import of xml files in questionbank and course import.
* Can handle xml files larger than 10MB through chunking the input file.
* Replaces the original xmlize by Hans Anderson, {@link http://www.hansanderson.com/contact/}
* with equal interface.
*
* @package core
* @subpackage lib
* @copyright Kilian Singer
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
/**
* Exception thrown when there is an error parsing an XML file.
*
* @copyright 2010 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
class xml_format_exception extends moodle_exception {
/** @var string */
public $errorstring;
/** @var int */
public $line;
/** @var char */
public $char;
/**
* Constructor function
*
* @param string $errorstring Errorstring
* @param int $line Linenumber
* @param char $char Errorcharacter
* @param string $link Link
*/
public function __construct($errorstring, $line, $char, $link = '') {
$this->errorstring = $errorstring;
$this->line = $line;
$this->char = $char;
$a = new stdClass();
$a->errorstring = $errorstring;
$a->errorline = $line;
$a->errorchar = $char;
parent::__construct('errorparsingxml', 'error', $link, $a);
}
}
/**
* Class for parsing xml files.
*
* Handles functionality for:
*
* Import of xml files in questionbank and course import.
* Can handle xml files larger than 10MB through chunking the input file.
* Uses a similar interface to the original version xmlize() by Hans Anderson.
*
* @package core
* @subpackage lib
* @copyright Kilian Singer
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_xml_parser {
/** @var array resulting $xml tree */
private $xml;
/** @var array stores references to constructed $xml tree */
private $current;
/** @var int tores the level in the XML tree */
private $level;
/**
* Is called when tags are opened.
*
* Note: Used by xml element handler as callback.
*
* @author Kilian Singer
* @param resource $parser The XML parser resource.
* @param string $name The XML source to parse.
* @param array $attrs Stores attributes of XML tag.
*/
private function startelement($parser, $name, $attrs) {
$current = &$this->current;
$level = &$this->level;
if (!empty($name)) {
if ($level == 0) {
$current[$level][$name] = array();
$current[$level][$name]["@"] = $attrs; // Attribute.
$current[$level][$name]["#"] = array(); // Other tags.
$current[$level + 1] = & $current[$level][$name]["#"];
$level++;
} else {
if (empty($current[$level][$name])) {
$current[$level][$name] = array();
}
$siz = count($current[$level][$name]);
if (!empty($attrs)) {
$current[$level][$name][$siz]["@"] = $attrs; // Attribute.
}
$current[$level][$name][$siz]["#"] = array(); // Other tags.
$current[$level + 1] = & $current[$level][$name][$siz]["#"];
$level++;
}
}
}
/**
* Is called when tags are closed.
*
* Note: Used by xml element handler as callback.
*
* @author Kilian Singer
* @param resource $parser The XML parser resource.
* @param string $name The XML source to parse.
*/
private function endelement($parser, $name) {
$current = &$this->current;
$level = &$this->level;
if (!empty($name)) {
if (empty($current[$level])) {
$current[$level] = '';
} else if (array_key_exists(0, $current[$level])) {
if (count($current[$level]) == 1) {
$current[$level] = $current[$level][0]; // We remove array index if we only have a single entry.
}
}
$level--;
}
}
/**
* Is called for text between the start and the end of tags.
*
* Note: Used by xml element handler as callback.
*
* @author Kilian Singer
* @param resource $parser The XML parser resource.
* @param string $data The XML source to parse.
*/
private function characterdata($parser, $data) {
$current = &$this->current;
$level = &$this->level;
if (($data == "0") || (!empty($data) && trim($data) != "")) {
$siz = count($current[$level]);
if ($siz == 0) {
$current[$level][0] = $data;
} else {
$key = max(array_keys($current[$level]));
if (is_int($key)) {
end($current[$level]);
if (is_int(key($current[$level]))) { // If last index is nummeric we have CDATA and concat.
$current[$level][$key] = $current[$level][$key] . $data;
} else {
$current[$level][$key + 1] = $data; // Otherwise we make a new key.
}
} else {
$current[$level][0] = $data;
}
}
}
}
/**
* Parses XML string.
*
* Note: Interface is kept equal to previous version.
*
* @author Kilian Singer
* @param string $data the XML source to parse.
* @param int $whitespace If set to 1 allows the parser to skip "space" characters in xml document. Default is 1
* @param string $encoding Specify an OUTPUT encoding. If not specified, it defaults to UTF-8.
* @param bool $reporterrors if set to true, then a {@link xml_format_exception}
* exception will be thrown if the XML is not well-formed. Otherwise errors are ignored.
* @return array representation of the parsed XML.
*/
public function parse($data, $whitespace = 1, $encoding = 'UTF-8', $reporterrors = false) {
$data = trim($data);
$this->xml = array();
$this->current = array();
$this->level = 0;
$this->current[0] = & $this->xml;
$parser = xml_parser_create($encoding);
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, $whitespace);
xml_set_element_handler($parser, [$this, "startelement"], [$this, "endelement"]);
xml_set_character_data_handler($parser, [$this, "characterdata"]);
// Start parsing an xml document.
for ($i = 0; $i < strlen($data); $i += 4096) {
if (!xml_parse($parser, substr($data, $i, 4096))) {
break;
}
}
if ($reporterrors) {
$errorcode = xml_get_error_code($parser);
if ($errorcode) {
$exception = new xml_format_exception(xml_error_string($errorcode),
xml_get_current_line_number($parser),
xml_get_current_column_number($parser));
xml_parser_free($parser);
throw $exception;
}
}
xml_parser_free($parser); // Deletes the parser.
if (empty($this->xml)) { // XML file is invalid or empty, return false.
return false;
}
return $this->xml;
}
}
/**
* XML parsing function calles into class.
*
* Note: Used by xml element handler as callback.
*
* @param string $data the XML source to parse.
* @param int $whitespace If set to 1 allows the parser to skip "space" characters in xml document. Default is 1
* @param string $encoding Specify an OUTPUT encoding. If not specified, it defaults to UTF-8.
* @param bool $reporterrors if set to true, then a {@link xml_format_exception}
* exception will be thrown if the XML is not well-formed. Otherwise errors are ignored.
* @return array representation of the parsed XML.
*/
function xmlize($data, $whitespace = 1, $encoding = 'UTF-8', $reporterrors = false) {
$hxml = new core_xml_parser();
return $hxml->parse($data, $whitespace, $encoding, $reporterrors);
}