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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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* An iterator on each of the contents of another iterator. |
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*/ |
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class SubIterator extends Iterator |
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{ |
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/** |
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* @var Iterator |
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*/ |
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protected $top; |
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public function __construct(Iterator $top) |
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{ |
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$this->top = $top; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function filter(\Closure $predicate) : Iterator |
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{ |
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// As we are working somewhere down the iteration, we have to apply |
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// the filter on all non files in the iterator above and return |
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// something similar to this. |
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return $this->wrappedMapTopOnNonFiles(function ($obj) use ($predicate) { |
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return $obj->filter($predicate); |
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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 map(\Closure $trans) : Iterator |
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{ |
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// As we are working somewhere down the iteration, we have to map |
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// the transformation on all non files in the iterator above and return |
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// something similar to this. |
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return $this->wrappedMapTopOnNonFiles(function ($obj) use ($trans) { |
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return $obj->map($trans); |
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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 fold($start_value, $iteration) |
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{ |
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// As this unwraps one layer of the iteration, we need to apply the fold |
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// function to the things in the iterator above and return something |
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// similar to the iterator above. |
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return $this->mapTopOnNonFiles(function ($v) use ($start_value, $iteration) { |
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return $v->fold($start_value, $iteration); |
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}); |
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} |
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// Helpers |
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protected function mapTop(\Closure $trans) |
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{ |
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return $this->top->map($trans); |
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} |
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protected function mapTopOnNonFiles(\Closure $trans) |
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{ |
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return $this->mapTop(function ($obj) use ($trans) { |
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if ($obj->isFile()) { |
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return $obj; |
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} |
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return $trans($obj); |
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}); |
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} |
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protected function wrap(Iterator $iter) |
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{ |
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return new SubIterator($iter); |
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} |
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protected function wrappedMapTop(\Closure $trans) |
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{ |
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return $this->wrap($this->mapTop($trans)); |
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} |
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protected function wrappedMapTopOnNonFiles(\Closure $trans) |
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{ |
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return $this->wrap($this->mapTopOnNonFiles($trans)); |
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} |
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} |
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lechimp-p /
flightcontrol
