WeightedList.php
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WeightedList.php
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	<?php

	namespace Keruald\OmniTools\Collections;

	use ArrayIterator;
	use Countable;
	use Iterator;
	use IteratorAggregate;

	class WeightedList implements IteratorAggregate, Countable {

	/**
	* @var WeightedValue[]
	*/
	private $list;

	public function __construct () {
	$this->list = [];
	}

	/**
	* @param string $expression A string like "a,b;q=0.1,c;q=0.4"
	*
	* @return WeightedList
	*
	* @see RFC 7231, section 5.3.1
	*/
	public static function parse (string $expression) : WeightedList {
	$list = new WeightedList();

	if ($expression !== "") {
	$items = explode(',', $expression);
	foreach ($items as $item) {
	$list->addFromString($item);
	}
	}

	return $list;
	}

	///
	/// Helper methods
	///

	public function add ($item, float $weight = 1.0) : void {
	$this->list[] = new WeightedValue($item, $weight);
	}

	public function addWeightedValue (WeightedValue $value) : void {
	$this->list[] = $value;
	}

	public function addFromString (string $expression) : void {
	$this->addWeightedValue(WeightedValue::parse($expression));
	}

	public function clear () : void {
	$this->list = [];
	}

	public function getHeaviest () {
	$value = null;

	foreach ($this->list as $candidate) {
	if ($value === null \|\| $candidate->compareTo($value) > 0) {
	$value = $candidate;
	}
	}

	return $value;
	}

	public function toSortedArray () : array {
	$weights = [];
	$values = [];

	foreach ($this->list as $item) {
	$weights[] = $item->getWeight();
	$values[] = $item->getValue();
	}

	array_multisort($weights, SORT_DESC, $values, SORT_ASC);

	return $values;
	}

	///
	/// IteratorAggregate implementation
	///

	public function getIterator () : Iterator {
	return new ArrayIterator($this->list);
	}

	///
	/// Countable implementation
	///

	public function count () : int {
	return count($this->list);
	}

	}

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