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<?php |
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/****************************************************************************** |
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* An iterator interface over the Leagues flysystem. |
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* Copyright (c) 2021, 2015 Richard Klees <[email protected]> |
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* |
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* This software is licensed under GPLv3. You should have received |
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* a copy of the along with the code. |
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*/ |
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namespace Lechimp\Flightcontrol; |
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/** |
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* This object can perform a recursion on the files in a directory. |
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* I don't know if the name really fits. |
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*/ |
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class Recursor extends FSObject |
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{ |
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use FilterTrait; |
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/** |
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* @var FixedFDirectory |
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*/ |
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protected $directory; |
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public function __construct(FixedFDirectory $directory) |
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{ |
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parent::__construct($directory->flightcontrol(), $directory->path()); |
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$this->directory = $directory; |
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} |
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/** |
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* Get a recursor that folds all files in this recursor that match the |
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* provided predicate and the objects below that match the predicate as |
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* well. |
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* |
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* Won't recurse over directories that do not match the predicate! |
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* |
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* @param \Closure $predicate (FSObject -> Bool) |
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*/ |
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public function filter(\Closure $predicate) : Recursor |
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{ |
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$filter = array(); |
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$filter[0] = function (FixedFDirectory $obj) use ($predicate, &$filter) { |
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return $obj |
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->filter($predicate) |
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->map(function (FSObject $obj) use ($predicate, &$filter) { |
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if ($obj->isFile()) { |
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return $obj; |
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} |
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return $filter[0]($obj); |
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}); |
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}; |
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return new Recursor($filter[0]($this->directory)); |
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} |
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/** |
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* We could also use the catamorphism on this to do recursion, as we |
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* have an unfix and an underlying fmap from the FDirectory. |
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* |
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* Supply a function $trans from File|FDirectory a to a that flattens |
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* (folds) a directory. Will start the directories where only files are |
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* included, folds them and then proceeds upwards. |
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* |
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* The return type should be 'a' (from the function $trans) instead |
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* of mixed, but we can't express that fact correctly in the docstring |
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* typing. |
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* |
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* @param \Closure $trans File|FDirectory a -> a |
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* @return mixed |
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*/ |
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public function cata(\Closure $trans) |
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{ |
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return $trans($this->directory->unfix()->fmap(function (FSObject $obj) use ($trans) { |
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if ($obj->isFile()) { |
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return $trans($obj); |
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} |
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assert($obj instanceof FixedFDirectory); |
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return $obj->cata($trans); |
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})); |
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} |
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/** |
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* Sugar for cata. |
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* |
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* @param \Closure $trans File|FDirectory a -> a |
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* @return mixed |
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*/ |
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public function with(\Closure $trans) |
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{ |
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return $this->cata($trans); |
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} |
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/** |
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* Fold over all files in this directory and subjacent directories. |
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* |
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* Start with an initial value of some type and a function from that type |
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* and File to a new value of the type. Will successively feed all files |
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* and the resulting values to that function. |
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* |
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* @param mixed $start_value |
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* @param \Closure $fold_with a -> File -> a |
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* @return Recursor|array |
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*/ |
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public function foldFiles($start_value, \Closure $fold_with) |
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{ |
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foreach ($this->allFiles() as $file) { |
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$start_value = $fold_with($start_value, $file); |
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} |
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return $start_value; |
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} |
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/** |
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* Get a list of all files in the directory and subjacent directories. |
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* |
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* @return File[] |
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*/ |
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public function allFiles() : array |
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{ |
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return $this->cata(function (FSObject $obj) { |
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if ($obj->isFile()) { |
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return array($obj); |
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} |
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assert($obj instanceof FDirectory); |
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$fcontents = $obj->fcontents(); |
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if (empty($fcontents)) { |
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return $fcontents; |
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} |
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return call_user_func_array("array_merge", $fcontents); |
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}); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function isFile() : bool |
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{ |
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return false; |
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} |
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} |
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lechimp-p /
flightcontrol
