PeekAndPoke /
psi
| @@ 16-52 (lines=37) @@ | ||
| 13 | * |
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| 14 | * @author Karsten J. Gerber <[email protected]> |
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| 15 | */ |
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| 16 | class LimitOperation implements IntermediateOperation |
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| 17 | { |
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| 18 | /** @var int */ |
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| 19 | private $limit; |
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| 20 | ||
| 21 | /** |
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| 22 | * @param int $limit |
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| 23 | */ |
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| 24 | public function __construct($limit) |
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| 25 | { |
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| 26 | $this->limit = $limit; |
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| 27 | } |
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| 28 | ||
| 29 | /** |
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| 30 | * @param mixed $input The element in the stream |
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| 31 | * @param mixed $index The index in the input iterator |
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| 32 | * @param IntermediateContext $context The solving context |
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| 33 | * |
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| 34 | * @return mixed |
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| 35 | */ |
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| 36 | public function apply($input, $index, IntermediateContext $context) |
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| 37 | { |
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| 38 | if (! $context->memory->contains($this)) { |
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| 39 | $context->memory->offsetSet($this, 0); |
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| 40 | } |
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| 41 | ||
| 42 | $count = $context->memory->offsetGet($this); |
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| 43 | $context->memory->offsetSet($this, $count+1); |
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| 44 | ||
| 45 | $takeIt = $count < $this->limit; |
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| 46 | ||
| 47 | $context->outUseItem = $takeIt; |
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| 48 | $context->outCanContinue = $takeIt; |
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| 49 | ||
| 50 | return $input; |
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| 51 | } |
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| 52 | } |
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| 53 | ||
| @@ 16-52 (lines=37) @@ | ||
| 13 | * |
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| 14 | * @author Karsten J. Gerber <[email protected]> |
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| 15 | */ |
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| 16 | class SkipOperation implements IntermediateOperation |
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| 17 | { |
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| 18 | /** @var int */ |
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| 19 | private $skip; |
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| 20 | ||
| 21 | /** |
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| 22 | * @param int $skip |
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| 23 | */ |
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| 24 | public function __construct($skip) |
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| 25 | { |
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| 26 | $this->skip = $skip; |
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| 27 | } |
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| 28 | ||
| 29 | /** |
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| 30 | * @param mixed $input The element in the stream |
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| 31 | * @param mixed $index The index in the input iterator |
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| 32 | * @param IntermediateContext $context The solving context |
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| 33 | * |
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| 34 | * @return mixed |
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| 35 | */ |
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| 36 | public function apply($input, $index, IntermediateContext $context) |
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| 37 | { |
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| 38 | if (! $context->memory->contains($this)) { |
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| 39 | $context->memory->offsetSet($this, 0); |
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| 40 | } |
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| 41 | ||
| 42 | $count = $context->memory->offsetGet($this); |
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| 43 | $context->memory->offsetSet($this, $count+1); |
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| 44 | ||
| 45 | $takeIt = $count >= $this->skip; |
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| 46 | ||
| 47 | $context->outUseItem = $takeIt; |
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| 48 | $context->outCanContinue = true; |
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| 49 | ||
| 50 | return $input; |
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| 51 | } |
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| 52 | } |
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| 53 | ||
