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Reader.php
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Reader.php
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<?php
namespace Sabre\VObject;
/**
* VCALENDAR/VCARD reader
*
* This class reads the vobject file, and returns a full element tree.
*
* TODO: this class currently completely works 'statically'. This is pointless,
* and defeats OOP principals. Needs refactoring in a future version.
*
* @copyright Copyright (C) 2007-2013 fruux GmbH (https://fruux.com/).
* @author Evert Pot (http://evertpot.com/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class Reader {
/**
* If this option is passed to the reader, it will be less strict about the
* validity of the lines.
*
* Currently using this option just means, that it will accept underscores
* in property names.
*/
const OPTION_FORGIVING = 1;
/**
* If this option is turned on, any lines we cannot parse will be ignored
* by the reader.
*/
const OPTION_IGNORE_INVALID_LINES = 2;
/**
* Parses the file and returns the top component
*
* The options argument is a bitfield. Pass any of the OPTIONS constant to
* alter the parsers' behaviour.
*
* @param string $data
* @param int $options
* @return Node
*/
static function read($data, $options = 0) {
// Normalizing newlines
$data = str_replace(array("\r","\n\n"), array("\n","\n"), $data);
$lines = explode("\n", $data);
// Unfolding lines
$lines2 = array();
foreach($lines as $line) {
// Skipping empty lines
if (!$line) continue;
if ($line[0]===" " || $line[0]==="\t") {
$lines2[count($lines2)-1].=substr($line,1);
} else {
$lines2[] = $line;
}
}
unset($lines);
reset($lines2);
return self::readLine($lines2, $options);
}
/**
* Reads and parses a single line.
*
* This method receives the full array of lines. The array pointer is used
* to traverse.
*
* This method returns null if an invalid line was encountered, and the
* IGNORE_INVALID_LINES option was turned on.
*
* @param array $lines
* @param int $options See the OPTIONS constants.
* @return Node
*/
static private function readLine(&$lines, $options = 0) {
$line = current($lines);
$lineNr = key($lines);
next($lines);
// Components
if (strtoupper(substr($line,0,6)) === "BEGIN:") {
$componentName = strtoupper(substr($line,6));
$obj = Component::create($componentName);
$nextLine = current($lines);
while(strtoupper(substr($nextLine,0,4))!=="END:") {
$parsedLine = self::readLine($lines, $options);
$nextLine = current($lines);
if (is_null($parsedLine)) {
continue;
}
$obj->add($parsedLine);
if ($nextLine===false)
throw new ParseException('Invalid VObject. Document ended prematurely.');
}
// Checking component name of the 'END:' line.
if (substr($nextLine,4)!==$obj->name) {
throw new ParseException('Invalid VObject, expected: "END:' . $obj->name . '" got: "' . $nextLine . '"');
}
next($lines);
return $obj;
}
// Properties
//$result = preg_match('/(?P<name>[A-Z0-9-]+)(?:;(?P<parameters>^(?<!:):))(.*)$/',$line,$matches);
if ($options & self::OPTION_FORGIVING) {
$token = '[A-Z0-9-\._]+';
} else {
$token = '[A-Z0-9-\.]+';
}
$parameters = "(?:;(?P<parameters>([^:^\"]|\"([^\"]*)\")*))?";
$regex = "/^(?P<name>$token)$parameters:(?P<value>.*)$/i";
$result = preg_match($regex,$line,$matches);
if (!$result) {
if ($options & self::OPTION_IGNORE_INVALID_LINES) {
return null;
} else {
throw new ParseException('Invalid VObject, line ' . ($lineNr+1) . ' did not follow the icalendar/vcard format');
}
}
$propertyName = strtoupper($matches['name']);
$propertyValue = preg_replace_callback('#(\\\\(\\\\|N|n))#',function($matches) {
if ($matches[2]==='n' || $matches[2]==='N') {
return "\n";
} else {
return $matches[2];
}
}, $matches['value']);
$obj = Property::create($propertyName, $propertyValue);
if ($matches['parameters']) {
foreach(self::readParameters($matches['parameters']) as $param) {
$obj->add($param);
}
}
return $obj;
}
/**
* Reads a parameter list from a property
*
* This method returns an array of Parameter
*
* @param string $parameters
* @return array
*/
static private function readParameters($parameters) {
$token = '[A-Z0-9-]+';
$paramValue = '(?P<paramValue>[^\"^;]*|"[^"]*")';
$regex = "/(?<=^|;)(?P<paramName>$token)(=$paramValue(?=$|;))?/i";
preg_match_all($regex, $parameters, $matches, PREG_SET_ORDER);
$params = array();
foreach($matches as $match) {
if (!isset($match['paramValue'])) {
$value = null;
} else {
$value = $match['paramValue'];
if (isset($value[0]) && $value[0]==='"') {
// Stripping quotes, if needed
$value = substr($value,1,strlen($value)-2);
}
$value = preg_replace_callback('#(\\\\(\\\\|N|n|;|,))#',function($matches) {
if ($matches[2]==='n' || $matches[2]==='N') {
return "\n";
} else {
return $matches[2];
}
}, $value);
}
$params[] = new Parameter($match['paramName'], $value);
}
return $params;
}
}

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