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PhutilICSWriter.php
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Thu, May 8, 14:09

PhutilICSWriter.php
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<?php
final class PhutilICSWriter extends Phobject {
public function writeICSDocument(PhutilCalendarRootNode $node) {
$out = array();
foreach ($node->getChildren() as $child) {
$out[] = $this->writeNode($child);
}
return implode('', $out);
}
private function writeNode(PhutilCalendarNode $node) {
if (!$this->getICSNodeType($node)) {
return null;
}
$out = array();
$out[] = $this->writeBeginNode($node);
$out[] = $this->writeNodeProperties($node);
if ($node instanceof PhutilCalendarContainerNode) {
foreach ($node->getChildren() as $child) {
$out[] = $this->writeNode($child);
}
}
$out[] = $this->writeEndNode($node);
return implode('', $out);
}
private function writeBeginNode(PhutilCalendarNode $node) {
$type = $this->getICSNodeType($node);
return $this->wrapICSLine("BEGIN:{$type}");
}
private function writeEndNode(PhutilCalendarNode $node) {
$type = $this->getICSNodeType($node);
return $this->wrapICSLine("END:{$type}");
}
private function writeNodeProperties(PhutilCalendarNode $node) {
$properties = $this->getNodeProperties($node);
$out = array();
foreach ($properties as $property) {
$propname = $property['name'];
$propvalue = $property['value'];
$propline = array();
$propline[] = $propname;
foreach ($property['parameters'] as $parameter) {
$paramname = $parameter['name'];
$paramvalue = 'TODO';
$propline[] = ";{$paramname}={$paramvalue}";
}
$propline[] = ":{$propvalue}";
$propline = implode('', $propline);
$out[] = $this->wrapICSLine($propline);
}
return implode('', $out);
}
private function getICSNodeType(PhutilCalendarNode $node) {
switch ($node->getNodeType()) {
case PhutilCalendarDocumentNode::NODETYPE:
return 'VCALENDAR';
case PhutilCalendarEventNode::NODETYPE:
return 'VEVENT';
default:
return null;
}
}
private function wrapICSLine($line) {
$out = array();
$buf = '';
// NOTE: The line may contain sequences of combining characters which are
// more than 80 bytes in length. If it does, we'll split them in the
// middle of the sequence. This is okay and generally anticipated by
// RFC5545, which even allows implementations to split multibyte
// characters. The sequence will be stitched back together properly by
// whatever is parsing things.
foreach (phutil_utf8v($line) as $character) {
// If adding this character would bring the line over 75 bytes, start
// a new line.
if (strlen($buf) + strlen($character) > 75) {
$out[] = $buf."\n";
$buf = ' ';
}
$buf .= $character;
}
$out[] = $buf."\n";
return implode('', $out);
}
private function getNodeProperties(PhutilCalendarNode $node) {
switch ($node->getNodeType()) {
case PhutilCalendarDocumentNode::NODETYPE:
return array();
case PhutilCalendarEventNode::NODETYPE:
return $this->getEventNodeProperties($node);
default:
return array();
}
}
private function getEventNodeProperties(PhutilCalendarEventNode $event) {
$properties = array();
$uid = $event->getUID();
if (!strlen($uid)) {
throw new Exception(
pht(
'Unable to write ICS document: event has no UID, but each event '.
'MUST have a UID.'));
}
$properties[] = $this->newTextProperty(
'UID',
$uid);
$created = $event->getCreatedDateTime();
if ($created) {
$properties[] = $this->newDateTimeProperty(
'CREATED',
$event->getCreatedDateTime());
}
$dtstamp = $event->getModifiedDateTime();
if (!$dtstamp) {
throw new Exception(
pht(
'Unable to write ICS document: event has no modified time, but '.
'each event MUST have a modified time.'));
}
$properties[] = $this->newDateTimeProperty(
'DTSTAMP',
$dtstamp);
$dtstart = $event->getStartDateTime();
if ($dtstart) {
$properties[] = $this->newDateTimeProperty(
'DTSTART',
$dtstart);
}
$dtend = $event->getEndDateTime();
if ($dtend) {
$properties[] = $this->newDateTimeProperty(
'DTEND',
$event->getEndDateTime());
}
$name = $event->getName();
if (strlen($name)) {
$properties[] = $this->newTextProperty(
'SUMMARY',
$name);
}
$description = $event->getDescription();
if (strlen($description)) {
$properties[] = $this->newTextProperty(
'DESCRIPTION',
$description);
}
return $properties;
}
private function newTextProperty(
$name,
$value,
array $parameters = array()) {
$map = array(
'\\' => '\\\\',
',' => '\\,',
"\n" => '\\n',
);
$value = (array)$value;
foreach ($value as $k => $v) {
$v = str_replace(array_keys($map), array_values($map), $v);
$value[$k] = $v;
}
$value = implode(',', $value);
return $this->newProperty($name, $value, $parameters);
}
private function newDateTimeProperty(
$name,
PhutilCalendarDateTime $value,
array $parameters = array()) {
$datetime = $value->getISO8601();
return $this->newProperty($name, $datetime, $parameters);
}
private function newProperty(
$name,
$value,
array $parameters = array()) {
// TODO: Actually handle parameters.
return array(
'name' => $name,
'value' => $value,
'parameters' => array(),
);
}
}

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