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<?php
/**
* qCal_Parser
* The parser accepts an array of qCal_Parser_Token objects and converts them
* to actual formatted icalendar data (in one of many formats). The default is
* qCal_Parser_iCal which is complient with RFC 2445, but there are others as well,
* such as qCal_Parser_xCal (xml) or qCal_Parser_hCal (microformats).
*
* @package qCal
* @subpackage qCal_Parser
* @copyright Luke Visinoni (luke.visinoni@gmail.com)
* @author Luke Visinoni (luke.visinoni@gmail.com)
* @license GNU Lesser General Public License
*/
class qCal_Parser {
/**
* @param array containing any options the particular parser accepts
*/
protected $options;
/**
* Constructor
* Pass in an array of options
* @todo Come up with list of available options
* @param array parser options
*/
public function __construct($options = array()) {
// set defaults...
$this->options = array(
'searchpath' => get_include_path(),
);
$this->options = array_merge($this->options, $options);
}
/**
* @todo What should this accept? filename? actual string content? either?
* @todo Maybe even create a parse() for raw string and a parseFile() for a file name?
*/
public function parse($content, $lexer = null) {
if (is_null($lexer)) {
$lexer = new qCal_Parser_Lexer_iCalendar($content);
}
$this->lexer = $lexer;
return $this->doParse($this->lexer->tokenize());
}
/**
* Parse a file. The searchpath defaults to the include path. Also, if the filename
* provided is an absolute path, the searchpath is not used. This is determined by
* either the file starting with a forward slash, or a drive letter (for Windows)
* @todo Throw an exception if file doesn't exist
* @todo I'm not really sure that it should default to the include path. That's not really what the include path is for, is it?
* @todo Test for path starting with a drive letter for windows (or find a better way to detect that)
*/
public function parseFile($filename) {
// @todo This is hacky... but it works
if (substr($filename, 0, 1) == '/' || substr($filename, 0, 3) == 'C:\\') {
if (file_exists($filename)) {
$content = file_get_contents($filename);
return $this->parse($content);
}
} else {
$paths = explode(PATH_SEPARATOR, $this->options['searchpath']);
foreach ($paths as $path) {
$fname = $path . DIRECTORY_SEPARATOR . $filename;
if (file_exists($fname)) {
$content = file_get_contents($fname);
return $this->parse($content);
}
}
}
throw new qCal_Exception_FileNotFound('File cannot be found: "' . $filename . '"');
}
/**
* Override doParse in a child class if necessary
*/
protected function doParse($tokens) {
$properties = array();
foreach ($tokens['properties'] as $propertytoken) {
$params = array();
foreach ($propertytoken['params'] as $paramtoken) {
$params[$paramtoken['param']] = $paramtoken['value'];
}
try {
$properties[] = qCal_Property::factory($propertytoken['property'], $propertytoken['value'], $params);
} catch (qCal_Exception $e) {
// @todo There should be a better way of determining what went wrong during parsing/lexing than this
// do nothing...
// pr($e);
}
}
$component = qCal_Component::factory($tokens['component'], $properties);
foreach ($tokens['children'] as $child) {
$childcmpnt = $this->doParse($child);
$component->attach($childcmpnt);
}
return $component;
}
}