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76 lines
1.4 KiB
76 lines
1.4 KiB
<?php
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namespace App\Tables;
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abstract class BaseNumerator
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{
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/** @var int */
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protected $next;
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/** @var int */
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protected $last;
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/**
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* BaseNumerator constructor.
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*
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* @param int|int[] $first - first index, or [first, last]
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* @param int|null $last - last index, or null
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*/
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public function __construct($first, $last = null)
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{
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if (is_array($first) && $last === null) {
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list($first, $last) = $first;
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}
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$this->next = $first;
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$this->last = $last;
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}
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/**
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* Get next key, incrementing the internal state
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*
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* @return string
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*/
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public function next()
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{
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if (!$this->hasMore())
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throw new \OutOfBoundsException("Column numerator has run out of allocated GCID slots");
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$key = $this->getKey($this->next);
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$this->next++;
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return $key;
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}
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/**
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* Convert numeric index to a key
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*
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* @param int $index
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* @return mixed
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*/
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protected function getKey($index)
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{
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return $index; // simple default
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}
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/**
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* @return bool - true iof there are more keys available
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*/
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protected function hasMore()
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{
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return $this->next <= $this->last;
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}
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/**
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* Generate all keys
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*
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* @return \Generator
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*/
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public function generate()
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{
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while ($this->hasMore()) {
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yield $this->next();
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}
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}
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}
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