58 lines
778 B
PHP
58 lines
778 B
PHP
<?php
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namespace SilverStripe\Core\Config;
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use Iterator;
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class DAG_Iterator implements Iterator
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{
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protected $data;
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protected $dag;
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protected $dagkeys;
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protected $i;
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public function __construct($data, $dag)
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{
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$this->data = $data;
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$this->dag = $dag;
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$this->rewind();
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}
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public function key()
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{
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return $this->i;
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}
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public function current()
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{
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$res = array();
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$res['from'] = $this->data[$this->i];
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$res['to'] = array();
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foreach ($this->dag[$this->i] as $to) {
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$res['to'][] = $this->data[$to];
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}
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return $res;
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}
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public function next()
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{
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$this->i = array_shift($this->dagkeys);
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}
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public function rewind()
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{
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$this->dagkeys = array_keys($this->dag);
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$this->next();
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}
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public function valid()
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{
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return $this->i !== null;
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}
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}
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