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<?php
/**
* Default icalendar renderer. Pass a component to the renderer, and it will render it in accordance with rfc 2445
* @package qCal
* @copyright Luke Visinoni (luke.visinoni@gmail.com)
* @author Luke Visinoni (luke.visinoni@gmail.com)
* @license GNU Lesser General Public License
*/
class qCal_Renderer_iCalendar extends qCal_Renderer {
const LINE_ENDING = "\r\n";
const FOLD_LENGTH = 75;
/**
* Render any component
*/
public function render(qCal_Component $component) {
$return = "BEGIN:" . $component->getName() . self::LINE_ENDING;
foreach ($component->getProperties() as $property) {
if (is_array($property)) {
foreach ($property as $prop) {
$return .= $this->renderProperty($prop);
}
} else {
$return .= $this->renderProperty($property);
}
}
foreach ($component->getChildren() as $children) {
if (is_array($children)) {
foreach ($children as $child) {
$return .= $this->render($child);
}
} else {
$return .= $this->render($children);
}
}
return $return . "END:" . $component->getName() . self::LINE_ENDING;
}
/**
* Renders a property in accordance with rfc 2445
* @todo $proptype is created below and never used... wtf?
*/
protected function renderProperty(qCal_Property $property) {
$propval = $property->getValue();
$params = $property->getParams();
$paramreturn = "";
foreach ($params as $paramname => $paramval) {
$paramreturn .= $this->renderParam($paramname, $paramval);
}
// if property has a "value" param, then use it as the type instead
$proptype = isset($params['VALUE']) ? $params['VALUE'] : $property->getType();
if ($property instanceof qCal_Property_MultiValue) {
$values = array();
foreach ($property->getValue() as $value) {
$values[] = $this->renderValue($property->getValue(), $proptype);
}
$value = implode(chr(44), $values);
} else {
$value = $this->renderValue($property->getValue(), $proptype);
}
$content = $property->getName() . $paramreturn . ":" . $value . self::LINE_ENDING;
return $this->fold($content);
}
/**
* Renders a value
*/
protected function renderValue($value, $type) {
switch(strtoupper($type)) {
case "TEXT":
$value = str_replace(",", "\,", $value);
break;
}
return $value;
}
/**
* Renders a parameter
* RFC 2445 says if paramval contains COLON (US-ASCII decimal
* 58), SEMICOLON (US-ASCII decimal 59) or COMMA (US-ASCII decimal 44)
* character separators MUST be specified as quoted-string text values
*/
protected function renderParam($name, $value) {
$invchars = array(chr(58),chr(59),chr(44));
$quote = false;
foreach ($invchars as $char) {
if (strstr($value, $char)) {
$quote = true;
break;
}
}
if ($quote) $value = '"' . $value . '"';
return ";" . $name . "=" . $value;
}
/**
* Text cannot exceed 75 octets. This method will "fold" long lines in accordance with RFC 2445
* @todo Make sure this is multi-byte safe
* @todo The file I downloaded from google used this same folding method (long lines went to 76)
* so until I see any different, I'm going to keep it at 76.
*/
protected function fold($data) {
if (strlen($data) == (self::FOLD_LENGTH + strlen(self::LINE_ENDING))) return $data;
$apart = str_split($data, self::FOLD_LENGTH);
return implode(self::LINE_ENDING . " ", $apart);
}
}