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<?php |
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declare(strict_types=1); |
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namespace Ipl\IteratorPipeline\Traits; |
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use Ipl as i; |
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use Ipl\Iterator\CombineIterator; |
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/** |
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* Mapping and projection methods for iterator pipeline |
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*/ |
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trait MappingTrait |
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{ |
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/** |
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* Define the next step via a callback that returns an array or Traversable object. |
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* |
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* @param callable $callback |
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* @param mixed ...$args |
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* @return static |
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*/ |
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abstract public function then(callable $callback, ...$args); |
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/** |
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* Map each element to a value using a callback function. |
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* |
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* @param callable $callback |
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* @return static |
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*/ |
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public function map(callable $callback) |
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{ |
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return $this->then(i\iterable_map, $callback); |
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} |
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/** |
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* Map the key of each element to a new key using a callback function. |
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* |
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* @param callable $callback |
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* @return static |
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*/ |
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public function mapKeys(callable $callback) |
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{ |
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return $this->then(i\iterable_map_keys, $callback); |
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} |
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/** |
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* Apply a callback to each element of an iterator. |
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* Any value returned by the callback is ignored. |
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* |
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* @param callable $callback |
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* @return static |
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*/ |
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public function apply(callable $callback) |
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{ |
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return $this->then(i\iterable_apply, $callback); |
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} |
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/** |
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* Group elements of an iterator, with the group name as key and an array of elements as value. |
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* |
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* @param callable $grouping |
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* @return static |
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*/ |
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public function group(callable $grouping) |
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{ |
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return $this->then(i\iterable_group, $grouping); |
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} |
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/** |
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* Walk through all sub-iterables and concatenate them. |
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* |
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* @return static |
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*/ |
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public function flatten() |
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{ |
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return $this->then(i\iterable_flatten); |
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} |
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/** |
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* Return the values from a single column / property. |
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* Create key/value pairs by specifying the key. |
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* |
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* @param string|int|null $valueColumn null to keep values |
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* @param string|int|null $keyColumn null to keep keys |
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* @return static |
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*/ |
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public function column($valueColumn, $keyColumn = null) |
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{ |
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return $this->then(i\iterable_column, $valueColumn, $keyColumn); |
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} |
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/** |
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* Project each element of an iterator to an associated (or numeric) array. |
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* Each element should be an array or object. |
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* |
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* @param array $mapping [new key => old key, ...] |
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* @return static |
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*/ |
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public function project(array $mapping) |
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{ |
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return $this->then(i\iterable_project, $mapping); |
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} |
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/** |
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* Reshape each element of an iterator, adding or removing properties or keys. |
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* |
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* @param array $columns [key => bool|string|int, ...] |
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* @return static |
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*/ |
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public function reshape(array $columns) |
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{ |
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return $this->then(i\iterable_reshape, $columns); |
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} |
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/** |
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* Keep the values, drop the keys. The keys become an incremental number. |
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* |
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* @return static |
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*/ |
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public function values() |
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{ |
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return $this->then(i\iterable_values); |
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} |
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/** |
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* Use the keys as values. The keys become an incremental number. |
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* |
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* @return static |
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*/ |
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public function keys() |
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{ |
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return $this->then(i\iterable_keys); |
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} |
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/** |
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* Use another iterator as keys and the current iterator as values. |
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* |
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* @param iterable $keys |
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* @return static |
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*/ |
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public function setKeys(iterable $keys) |
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{ |
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$combine = function ($values, $keys) { |
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return new CombineIterator($keys, $values); |
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}; |
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return $this->then($combine, $keys); |
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} |
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/** |
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* Use values as keys and visa versa. |
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* |
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* @return static |
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*/ |
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public function flip() |
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{ |
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return $this->then(i\iterable_flip); |
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} |
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} |
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jasny /
improved-php-iterable
