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simplified_parser_processor.class.php
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simplified_parser_processor.class.php
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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/>.
/**
* @package moodlecore
* @subpackage xml
* @copyright 2003 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
require_once($CFG->dirroot.'/backup/util/xml/parser/processors/progressive_parser_processor.class.php');
/**
* Abstract xml parser processor to to simplify and dispatch parsed chunks
*
* This @progressive_parser_processor handles the requested paths,
* performing some conversions from the original "propietary array format"
* used by the @progressive_parser to a simplified structure to be used
* easily. Found attributes are converted automatically to tags and cdata
* to simpler values.
*
* Note: final tag attributes are discarded completely!
*
* TODO: Complete phpdocs
*/
abstract class simplified_parser_processor extends progressive_parser_processor {
protected $paths; // array of paths we are interested on
protected $parentpaths; // array of parent paths of the $paths
protected $parentsinfo; // array of parent attributes to be added as child tags
protected $startendinfo;// array (stack) of startend information
public function __construct(array $paths = array()) {
parent::__construct();
$this->paths = array();
$this->parentpaths = array();
$this->parentsinfo = array();
$this->startendinfo = array();
// Add paths and parentpaths. We are looking for attributes there
foreach ($paths as $key => $path) {
$this->add_path($path);
}
}
public function add_path($path) {
$this->paths[] = $path;
$this->parentpaths[] = progressive_parser::dirname($path);
}
/**
* Get the already simplified chunk and dispatch it
*/
abstract protected function dispatch_chunk($data);
/**
* Get one selected path and notify about start
*/
abstract protected function notify_path_start($path);
/**
* Get one selected path and notify about end
*/
abstract protected function notify_path_end($path);
/**
* Get one chunk of parsed data and make it simpler
* adding attributes as tags and delegating to
* dispatch_chunk() the procesing of the resulting chunk
*/
public function process_chunk($data) {
// Precalculate some vars for readability
$path = $data['path'];
$parentpath = progressive_parser::dirname($path);
$tag = basename($path);
// If the path is a registered parent one, store all its tags
// so, we'll be able to find attributes later when processing
// (child) registered paths (to get attributes if present)
if ($this->path_is_selected_parent($path)) { // if path is parent
if (isset($data['tags'])) { // and has tags, save them
$this->parentsinfo[$path] = $data['tags'];
}
}
// If the path is a registered one, let's process it
if ($this->path_is_selected($path)) {
// Send all the pending notify_path_start/end() notifications
$this->process_pending_startend_notifications($path, 'start');
// First of all, look for attributes available at parentsinfo
// in order to get them available as normal tags
if (isset($this->parentsinfo[$parentpath][$tag]['attrs'])) {
$data['tags'] = array_merge($this->parentsinfo[$parentpath][$tag]['attrs'], $data['tags']);
unset($this->parentsinfo[$parentpath][$tag]['attrs']);
}
// Now, let's simplify the tags array, ignoring tag attributtes and
// reconverting to simpler name => value array. At the same time,
// check for all the tag values being whitespace-string values, if all them
// are whitespace strings, we aren't going to postprocess/dispatch the chunk
$alltagswhitespace = true;
foreach ($data['tags'] as $key => $value) {
// If the value is already a single value, do nothing
// surely was added above from parentsinfo attributes,
// so we'll process the chunk always
if (!is_array($value)) {
$alltagswhitespace = false;
continue;
}
// If the path including the tag name matches another selected path
// (registered or parent) and is null or begins with linefeed, we know it's part
// of another chunk, delete it, another chunk will contain that info
if ($this->path_is_selected($path . '/' . $key) ||
$this->path_is_selected_parent($path . '/' . $key)) {
if (!isset($value['cdata']) || substr($value['cdata'], 0, 1) === "\n") {
unset($data['tags'][$key]);
continue;
}
}
// Convert to simple name => value array
$data['tags'][$key] = isset($value['cdata']) ? $value['cdata'] : null;
// Check $alltagswhitespace continues being true
if ($alltagswhitespace && strlen($data['tags'][$key]) !== 0 && trim($data['tags'][$key]) !== '') {
$alltagswhitespace = false; // Found non-whitespace value
}
}
// Arrived here, if the chunk has tags and not all tags are whitespace,
// send it to postprocess filter that will decide about dispatching. Else
// skip the chunk completely
if (!empty($data['tags']) && !$alltagswhitespace) {
return $this->postprocess_chunk($data);
} else {
$this->chunks--; // Chunk skipped
}
} else {
$this->chunks--; // Chunk skipped
}
return true;
}
/**
* The parser fires this each time one path is going to be parsed
*
* @param string $path xml path which parsing has started
*/
public function before_path($path) {
if ($this->path_is_selected($path)) {
$this->startendinfo[] = array('path' => $path, 'action' => 'start');
}
}
/**
* The parser fires this each time one path has been parsed
*
* @param string $path xml path which parsing has ended
*/
public function after_path($path) {
$toprocess = false;
// If the path being closed matches (same or parent) the first path in the stack
// we process pending startend notifications until one matching end is found
if ($element = reset($this->startendinfo)) {
$elepath = $element['path'];
$eleaction = $element['action'];
if (strpos($elepath, $path) === 0) {
$toprocess = true;
}
// Also, if the stack of startend notifications is empty, we can process current end
// path safely
} else {
$toprocess = true;
}
if ($this->path_is_selected($path)) {
$this->startendinfo[] = array('path' => $path, 'action' => 'end');
}
// Send all the pending startend notifications if decided to do so
if ($toprocess) {
$this->process_pending_startend_notifications($path, 'end');
}
}
// Protected API starts here
/**
* Adjust start/end til finding one match start/end path (included)
*
* This will trigger all the pending {@see notify_path_start} and
* {@see notify_path_end} calls for one given path and action
*
* @param string path the path to look for as limit
* @param string action the action to look for as limit
*/
protected function process_pending_startend_notifications($path, $action) {
// Iterate until one matching path and action is found (or the array is empty)
$elecount = count($this->startendinfo);
$elematch = false;
while ($elecount > 0 && !$elematch) {
$element = array_shift($this->startendinfo);
$elecount--;
$elepath = $element['path'];
$eleaction = $element['action'];
if ($elepath == $path && $eleaction == $action) {
$elematch = true;
}
if ($eleaction == 'start') {
$this->notify_path_start($elepath);
} else {
$this->notify_path_end($elepath);
}
}
}
protected function postprocess_chunk($data) {
$this->dispatch_chunk($data);
}
protected function path_is_selected($path) {
return in_array($path, $this->paths);
}
protected function path_is_selected_parent($path) {
return in_array($path, $this->parentpaths);
}
/**
* Returns the first selected parent if available or false
*/
protected function selected_parent_exists($path) {
$parentpath = progressive_parser::dirname($path);
while ($parentpath != '/') {
if ($this->path_is_selected($parentpath)) {
return $parentpath;
}
$parentpath = progressive_parser::dirname($parentpath);
}
return false;
}
}