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<?php
/**
* A Mustache Partial filesystem loader.
*
* @author Justin Hileman {@link http://justinhileman.com}
*/
class MustacheLoader implements ArrayAccess {
protected $baseDir;
protected $partialsCache = array();
protected $extension;
/**
* MustacheLoader constructor.
*
* @access public
* @param string $baseDir Base template directory.
* @param string $extension File extension for Mustache files (default: 'mustache')
* @return void
*/
public function __construct($baseDir, $extension = 'mustache') {
if (!is_dir($baseDir)) {
throw new InvalidArgumentException('$baseDir must be a valid directory, ' . $baseDir . ' given.');
}
$this->baseDir = $baseDir;
$this->extension = $extension;
}
/**
* @param string $offset Name of partial
* @return boolean
*/
public function offsetExists($offset) {
return (isset($this->partialsCache[$offset]) || file_exists($this->pathName($offset)));
}
/**
* @throws InvalidArgumentException if the given partial doesn't exist
* @param string $offset Name of partial
* @return string Partial template contents
*/
public function offsetGet($offset) {
if (!$this->offsetExists($offset)) {
throw new InvalidArgumentException('Partial does not exist: ' . $offset);
}
if (!isset($this->partialsCache[$offset])) {
$this->partialsCache[$offset] = file_get_contents($this->pathName($offset));
}
return $this->partialsCache[$offset];
}
/**
* MustacheLoader is an immutable filesystem loader. offsetSet throws a LogicException if called.
*
* @throws LogicException
* @return void
*/
public function offsetSet($offset, $value) {
throw new LogicException('Unable to set offset: MustacheLoader is an immutable ArrayAccess object.');
}
/**
* MustacheLoader is an immutable filesystem loader. offsetUnset throws a LogicException if called.
*
* @throws LogicException
* @return void
*/
public function offsetUnset($offset) {
throw new LogicException('Unable to unset offset: MustacheLoader is an immutable ArrayAccess object.');
}
/**
* An internal helper for generating path names.
*
* @param string $file Partial name
* @return string File path
*/
protected function pathName($file) {
return $this->baseDir . '/' . $file . '.' . $this->extension;
}
}