/**
* Retrieve a variable from the actual entry.
*
* @param string $name
* @return string|integer|null
*/
public function getVariable($name)
{
if (isset($this->data[$this->position]) == true && array_key_exists($name, $this->data[$this->position]) == true) {
$return = $this->data[$this->position][$name];
if (Container::getAbbreviation() !== false && Container::getAbbreviation()->get($name, $return) !== null) {
return Container::getAbbreviation()->get($name, $return);
}
return $return;
} elseif ($name == 'citation-number') {
if (Container::getContext()->in('sort') == true) {
// index (starting at 1) of the cited reference in the bibliography (generated by the CSL processor)
$number = Container::getData()->getPosition();
if (Container::getContext()->get('sort') == 'descending') {
$number = Container::getData()->getLength() - $number;
} else {
$number++;
}
$this->setVariable('citation-number', (int) $number);
return (int) $number;
} else {
// return position in bibliography if no citation-number is set
return (int) $this->position + 1;
}
}
return null;
}
/**
* Renders the variable.
*
* @param string $data
* @return string
*/
public function render($data)
{
if ($this->form !== '') {
$return = Container::getData()->getVariable($this->name . '-' . $this->form);
if ($return !== null) {
return $return;
}
if (is_object(Container::getAbbreviation()) == true) {
$return = Container::getAbbreviation()->get($this->name, $this->form);
}
if ($return !== null) {
return $return;
}
}
// special cases
switch ($this->name) {
case 'title-short':
$return = Container::getData()->getVariable('shortTitle');
if ($return !== null) {
return $return;
}
break;
case 'title':
if ($this->form == 'short') {
$return = Container::getData()->getVariable('shortTitle');
if ($return !== null) {
return $return;
}
}
break;
case 'citation-label':
$return = Container::getData()->getVariable($this->name);
if ($return !== null) {
return $return;
}
// first 4 letters from the first two author family names and last to year digits
$authors = Container::getData()->getVariable('author');
$format = new Format();
if (isset($authors[0]['family']) == true && $format->format('issued') == true) {
$year = $format->getData();
if (isset($year[0]['year']) == true) {
switch (count($authors)) {
case 1:
$author = substr($authors[0]['family'], 0, 4);
break;
case 2:
$author = substr($authors[0]['family'], 0, 2) . substr($authors[1]['family'], 0, 2);
break;
default:
$author = '';
for ($i = 0; $i < 4; $i++) {
if (preg_match('/[A-Z]/', $authors[$i]['family'], $match) == 1) {
$author .= $match[0];
}
}
break;
}
$length = strlen($year[0]['year']);
return $author . substr($year[0]['year'], $length - 2, $length);
}
}
break;
case 'page':
$format = Container::getContext()->getValue('pageRangeFormat');
if (is_object($format) == true) {
return $format->format(Container::getData()->getVariable($this->name));
}
break;
case 'first-reference-note-number':
// number of a preceding note containing the first reference to the item
if (Container::getCitationItem()->get('noteIndex') !== null || Container::getCitationItem()->get('index') !== null) {
$first = Container::getRendered()->getPositionOfFirstId(Container::getActualId());
if ($first !== null && $first < Container::getRendered()->getLength()) {
return $first;
}
}
break;
}
$return = Container::getData()->getVariable($this->name);
if ($return !== null) {
return $return;
}
// retrieve variables form citations
if (Container::getContext()->getName() == 'citation' && Container::getCitationItem() !== false) {
$return = Container::getCitationItem()->get($this->name);
if ($return !== null) {
return $return;
}
}
return '';
}
