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<?php
/**
* Whoops - php errors for cool kids
* @author Filipe Dobreira <http://github.com/filp>
*/
namespace Whoops\Exception;
use ArrayAccess;
use ArrayIterator;
use Countable;
use IteratorAggregate;
use Serializable;
use UnexpectedValueException;
/**
* Exposes a fluent interface for dealing with an ordered list
* of stack-trace frames.
*/
class FrameCollection implements ArrayAccess, IteratorAggregate, Serializable, Countable
{
/**
* @var array[]
*/
private $frames;
/**
* @param array $frames
*/
public function __construct(array $frames)
{
$this->frames = array_map(function ($frame) {
return new Frame($frame);
}, $frames);
}
/**
* Filters frames using a callable, returns the same FrameCollection
*
* @param callable $callable
* @return FrameCollection
*/
public function filter($callable)
{
$this->frames = array_filter($this->frames, $callable);
return $this;
}
/**
* Map the collection of frames
*
* @param callable $callable
* @return FrameCollection
*/
public function map($callable)
{
// Contain the map within a higher-order callable
// that enforces type-correctness for the $callable
$this->frames = array_map(function ($frame) use ($callable) {
$frame = call_user_func($callable, $frame);
if (!$frame instanceof Frame) {
throw new UnexpectedValueException(
"Callable to " . __METHOD__ . " must return a Frame object"
);
}
return $frame;
}, $this->frames);
return $this;
}
/**
* Returns an array with all frames, does not affect
* the internal array.
*
* @todo If this gets any more complex than this,
* have getIterator use this method.
* @see FrameCollection::getIterator
* @return array
*/
public function getArray()
{
return $this->frames;
}
/**
* @see IteratorAggregate::getIterator
* @return ArrayIterator
*/
public function getIterator()
{
return new ArrayIterator($this->frames);
}
/**
* @see ArrayAccess::offsetExists
* @param int $offset
*/
public function offsetExists($offset)
{
return isset($this->frames[$offset]);
}
/**
* @see ArrayAccess::offsetGet
* @param int $offset
*/
public function offsetGet($offset)
{
return $this->frames[$offset];
}
/**
* @see ArrayAccess::offsetSet
* @param int $offset
*/
public function offsetSet($offset, $value)
{
throw new \Exception(__CLASS__ . ' is read only');
}
/**
* @see ArrayAccess::offsetUnset
* @param int $offset
*/
public function offsetUnset($offset)
{
throw new \Exception(__CLASS__ . ' is read only');
}
/**
* @see Countable::count
* @return int
*/
public function count()
{
return count($this->frames);
}
/**
* @see Serializable::serialize
* @return string
*/
public function serialize()
{
return serialize($this->frames);
}
/**
* @see Serializable::unserialize
* @param string $serializedFrames
*/
public function unserialize($serializedFrames)
{
$this->frames = unserialize($serializedFrames);
}
/**
* @param Frame[] $frames Array of Frame instances, usually from $e->getPrevious()
*/
public function prependFrames(array $frames)
{
$this->frames = array_merge($frames, $this->frames);
}
/**
* Gets the innermost part of stack trace that is not the same as that of outer exception
*
* @param FrameCollection $parentFrames Outer exception frames to compare tail against
* @return Frame[]
*/
public function topDiff(FrameCollection $parentFrames)
{
$diff = $this->frames;
$parentFrames = $parentFrames->getArray();
$p = count($parentFrames)-1;
for ($i = count($diff)-1; $i >= 0 && $p >= 0; $i--) {
/** @var Frame $tailFrame */
$tailFrame = $diff[$i];
if ($tailFrame->equals($parentFrames[$p])) {
unset($diff[$i]);
}
$p--;
}
return $diff;
}
}
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