239 lines
8.5 KiB
PHP
239 lines
8.5 KiB
PHP
<?php
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/**
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* Pico's Twig extension to implement additional filters
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*
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* @author Daniel Rudolf
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* @link http://picocms.org
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* @license http://opensource.org/licenses/MIT
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* @version 1.0
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*/
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class PicoTwigExtension extends Twig_Extension
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{
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/**
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* Current instance of Pico
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*
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* @see PicoTwigExtension::getPico()
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* @var Pico
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*/
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private $pico;
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/**
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* Constructs a new instance of this Twig extension
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*
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* @param Pico $pico current instance of Pico
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*/
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public function __construct(Pico $pico)
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{
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$this->pico = $pico;
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}
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/**
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* Returns the extensions instance of Pico
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*
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* @see Pico
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* @return Pico the extensions instance of Pico
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*/
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public function getPico()
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{
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return $this->pico;
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}
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/**
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* Returns the name of the extension
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*
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* @see Twig_ExtensionInterface::getName()
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* @return string the extension name
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*/
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public function getName()
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{
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return 'PicoTwigExtension';
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}
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/**
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* Returns the Twig filters markdown, map and sort_by
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*
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* @see Twig_ExtensionInterface::getFilters()
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* @return Twig_SimpleFilter[] array of Pico's Twig filters
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*/
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public function getFilters()
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{
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return array(
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'markdown' => new Twig_SimpleFilter('markdown', array($this, 'markdownFilter')),
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'map' => new Twig_SimpleFilter('map', array($this, 'mapFilter')),
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'sort_by' => new Twig_SimpleFilter('sort_by', array($this, 'sortByFilter')),
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);
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}
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/**
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* Parses a markdown string to HTML
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*
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* This method is registered as the Twig `markdown` filter. You can use it
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* to e.g. parse a meta variable (`{{ meta.description|markdown }}`).
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* Don't use it to parse the contents of a page, use the `content` filter
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* instead, what ensures the proper preparation of the contents.
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*
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* @param string $markdown markdown to parse
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* @return string parsed HTML
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*/
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public function markdownFilter($markdown)
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{
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if ($this->getPico()->getParsedown() === null) {
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throw new LogicException(
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'Unable to apply Twig "markdown" filter: '
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. 'Parsedown instance wasn\'t registered yet'
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);
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}
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return $this->getPico()->getParsedown()->text($markdown);
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}
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/**
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* Returns a array with the values of the given key or key path
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*
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* This method is registered as the Twig `map` filter. You can use this
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* filter to e.g. get all page titles (`{{ pages|map("title") }}`).
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*
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* @param array|Traversable $var variable to map
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* @param mixed $mapKeyPath key to map; either a scalar or a
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* array interpreted as key path (i.e. ['foo', 'bar'] will return all
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* $item['foo']['bar'] values)
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* @return array mapped values
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*/
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public function mapFilter($var, $mapKeyPath)
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{
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if (!is_array($var) && (!is_object($var) || !is_a($var, 'Traversable'))) {
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throw new Twig_Error_Runtime(sprintf(
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'The map filter only works with arrays or "Traversable", got "%s"',
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is_object($var) ? get_class($var) : gettype($var)
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));
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}
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$result = array();
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foreach ($var as $key => $value) {
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$mapValue = $this->getKeyOfVar($value, $mapKeyPath);
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$result[$key] = ($mapValue !== null) ? $mapValue : $value;
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}
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return $result;
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}
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/**
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* Sorts an array by one of its keys or a arbitrary deep sub-key
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*
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* This method is registered as the Twig `sort_by` filter. You can use this
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* filter to e.g. sort the pages array by a arbitrary meta value. Calling
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* `{{ pages|sort_by("meta:nav"|split(":")) }}` returns all pages sorted by
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* the meta value `nav`. Please note the `"meta:nav"|split(":")` part of
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* the example. The sorting algorithm will never assume equality of two
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* values, it will then fall back to the original order. The result is
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* always sorted in ascending order, apply Twigs `reverse` filter to
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* achieve a descending order.
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*
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* @param array|Traversable $var variable to sort
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* @param mixed $sortKeyPath key to use for sorting; either
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* a scalar or a array interpreted as key path (i.e. ['foo', 'bar']
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* will sort $var by $item['foo']['bar'])
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* @param string $fallback specify what to do with items
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* which don't contain the specified sort key; use "bottom" (default)
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* to move those items to the end of the sorted array, "top" to rank
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* them first, or "keep" to keep the original order of those items
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* @return array sorted array
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*/
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public function sortByFilter($var, $sortKeyPath, $fallback = 'bottom')
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{
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if (is_object($var) && is_a($var, 'Traversable')) {
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$var = iterator_to_array($var, true);
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} elseif (!is_array($var)) {
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throw new Twig_Error_Runtime(sprintf(
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'The sort_by filter only works with arrays or "Traversable", got "%s"',
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is_object($var) ? get_class($var) : gettype($var)
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));
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}
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if (($fallback !== 'top') && ($fallback !== 'bottom') && ($fallback !== 'keep')) {
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throw new Twig_Error_Runtime('The sort_by filter only supports the "top", "bottom" and "keep" fallbacks');
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}
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$twigExtension = $this;
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$varKeys = array_keys($var);
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uksort($var, function ($a, $b) use ($twigExtension, $var, $varKeys, $sortKeyPath, $fallback, &$removeItems) {
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$aSortValue = $twigExtension->getKeyOfVar($var[$a], $sortKeyPath);
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$aSortValueNull = ($aSortValue === null);
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$bSortValue = $twigExtension->getKeyOfVar($var[$b], $sortKeyPath);
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$bSortValueNull = ($bSortValue === null);
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if ($aSortValueNull xor $bSortValueNull) {
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if ($fallback === 'top') {
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return ($aSortValueNull - $bSortValueNull) * -1;
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} elseif ($fallback === 'bottom') {
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return ($aSortValueNull - $bSortValueNull);
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}
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} elseif (!$aSortValueNull && !$bSortValueNull) {
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if ($aSortValue != $bSortValue) {
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return ($aSortValue > $bSortValue) ? 1 : -1;
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}
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}
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// never assume equality; fallback to original order
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$aIndex = array_search($a, $varKeys);
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$bIndex = array_search($b, $varKeys);
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return ($aIndex > $bIndex) ? 1 : -1;
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});
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return $var;
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}
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/**
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* Returns the value of a variable item specified by a scalar key or a
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* arbitrary deep sub-key using a key path
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*
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* @param array|Traversable|ArrayAccess|object $var base variable
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* @param mixed $keyPath scalar key or a
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* array interpreted as key path (when passing e.g. ['foo', 'bar'],
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* the method will return $var['foo']['bar']) specifying the value
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* @return mixed the requested
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* value or NULL when the given key or key path didn't match
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*/
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public static function getKeyOfVar($var, $keyPath)
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{
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if (empty($keyPath)) {
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return null;
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} elseif (!is_array($keyPath)) {
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$keyPath = array($keyPath);
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}
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foreach ($keyPath as $key) {
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if (is_object($var)) {
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if (is_a($var, 'ArrayAccess')) {
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// use ArrayAccess, see below
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} elseif (is_a($var, 'Traversable')) {
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$var = iterator_to_array($var);
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} elseif (isset($var->{$key})) {
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$var = $var->{$key};
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continue;
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} elseif (is_callable(array($var, 'get' . ucfirst($key)))) {
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try {
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$var = call_user_func(array($var, 'get' . ucfirst($key)));
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continue;
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} catch (BadMethodCallException $e) {
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return null;
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}
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} else {
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return null;
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}
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} elseif (!is_array($var)) {
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return null;
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}
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if (isset($var[$key])) {
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$var = $var[$key];
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continue;
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}
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return null;
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}
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return $var;
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}
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}
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