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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2015 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy;
/**
* The Shell execution context.
*
* This class encapsulates the current variables, most recent return value and
* exception, and the current namespace.
*/
class Context
{
private static $specialVars = array('_', '_e', '__psysh__');
private $scopeVariables = array();
private $lastException;
private $returnValue;
/**
* Get a context variable.
*
* @throws InvalidArgumentException If the variable is not found in the current context.
*
* @param string $name
*
* @return mixed
*/
public function get($name)
{
switch ($name) {
case '_':
return $this->returnValue;
case '_e':
if (!isset($this->lastException)) {
throw new \InvalidArgumentException('Unknown variable: $' . $name);
}
return $this->lastException;
default:
if (!array_key_exists($name, $this->scopeVariables)) {
throw new \InvalidArgumentException('Unknown variable: $' . $name);
}
return $this->scopeVariables[$name];
}
}
/**
* Get all defined variables.
*
* @return array
*/
public function getAll()
{
$vars = $this->scopeVariables;
$vars['_'] = $this->returnValue;
if (isset($this->lastException)) {
$vars['_e'] = $this->lastException;
}
return $vars;
}
/**
* Set all scope variables.
*
* This method does *not* set the magic $_ and $_e variables.
*
* @param array $vars
*/
public function setAll(array $vars)
{
foreach (self::$specialVars as $key) {
unset($vars[$key]);
}
$this->scopeVariables = $vars;
}
/**
* Set the most recent return value.
*
* @param mixed $value
*/
public function setReturnValue($value)
{
$this->returnValue = $value;
}
/**
* Get the most recent return value.
*
* @return mixed
*/
public function getReturnValue()
{
return $this->returnValue;
}
/**
* Set the most recent Exception.
*
* @param \Exception $e
*/
public function setLastException(\Exception $e)
{
$this->lastException = $e;
}
/**
* Get the most recent Exception.
*
* @throws InvalidArgumentException If no Exception has been caught.
*
* @return null|Exception
*/
public function getLastException()
{
if (!isset($this->lastException)) {
throw new \InvalidArgumentException('No most-recent exception');
}
return $this->lastException;
}
}