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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2018 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 $specialNames = ['_', '_e', '__out', '__psysh__', 'this'];
// Whitelist a very limited number of command-scope magic variable names.
// This might be a bad idea, but future me can sort it out.
private static $commandScopeNames = [
'__function', '__method', '__class', '__namespace', '__file', '__line', '__dir',
];
private $scopeVariables = [];
private $commandScopeVariables = [];
private $returnValue;
private $lastException;
private $lastStdout;
private $boundObject;
private $boundClass;
/**
* 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)) {
return $this->lastException;
}
break;
case '__out':
if (isset($this->lastStdout)) {
return $this->lastStdout;
}
break;
case 'this':
if (isset($this->boundObject)) {
return $this->boundObject;
}
break;
case '__function':
case '__method':
case '__class':
case '__namespace':
case '__file':
case '__line':
case '__dir':
if (\array_key_exists($name, $this->commandScopeVariables)) {
return $this->commandScopeVariables[$name];
}
break;
default:
if (\array_key_exists($name, $this->scopeVariables)) {
return $this->scopeVariables[$name];
}
break;
}
throw new \InvalidArgumentException('Unknown variable: $' . $name);
}
/**
* Get all defined variables.
*
* @return array
*/
public function getAll()
{
return \array_merge($this->scopeVariables, $this->getSpecialVariables());
}
/**
* Get all defined magic variables: $_, $_e, $__out, $__class, $__file, etc.
*
* @return array
*/
public function getSpecialVariables()
{
$vars = [
'_' => $this->returnValue,
];
if (isset($this->lastException)) {
$vars['_e'] = $this->lastException;
}
if (isset($this->lastStdout)) {
$vars['__out'] = $this->lastStdout;
}
if (isset($this->boundObject)) {
$vars['this'] = $this->boundObject;
}
return \array_merge($vars, $this->commandScopeVariables);
}
/**
* Set all scope variables.
*
* This method does *not* set any of the magic variables: $_, $_e, $__out,
* $__class, $__file, etc.
*
* @param array $vars
*/
public function setAll(array $vars)
{
foreach (self::$specialNames as $key) {
unset($vars[$key]);
}
foreach (self::$commandScopeNames 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;
}
/**
* Set the most recent output from evaluated code.
*
* @param string $lastStdout
*/
public function setLastStdout($lastStdout)
{
$this->lastStdout = $lastStdout;
}
/**
* Get the most recent output from evaluated code.
*
* @throws \InvalidArgumentException If no output has happened yet
*
* @return null|string
*/
public function getLastStdout()
{
if (!isset($this->lastStdout)) {
throw new \InvalidArgumentException('No most-recent output');
}
return $this->lastStdout;
}
/**
* Set the bound object ($this variable) for the interactive shell.
*
* Note that this unsets the bound class, if any exists.
*
* @param object|null $boundObject
*/
public function setBoundObject($boundObject)
{
$this->boundObject = \is_object($boundObject) ? $boundObject : null;
$this->boundClass = null;
}
/**
* Get the bound object ($this variable) for the interactive shell.
*
* @return object|null
*/
public function getBoundObject()
{
return $this->boundObject;
}
/**
* Set the bound class (self) for the interactive shell.
*
* Note that this unsets the bound object, if any exists.
*
* @param string|null $boundClass
*/
public function setBoundClass($boundClass)
{
$this->boundClass = (\is_string($boundClass) && $boundClass !== '') ? $boundClass : null;
$this->boundObject = null;
}
/**
* Get the bound class (self) for the interactive shell.
*
* @return string|null
*/
public function getBoundClass()
{
return $this->boundClass;
}
/**
* Set command-scope magic variables: $__class, $__file, etc.
*
* @param array $commandScopeVariables
*/
public function setCommandScopeVariables(array $commandScopeVariables)
{
$vars = [];
foreach ($commandScopeVariables as $key => $value) {
// kind of type check
if (\is_scalar($value) && \in_array($key, self::$commandScopeNames)) {
$vars[$key] = $value;
}
}
$this->commandScopeVariables = $vars;
}
/**
* Get command-scope magic variables: $__class, $__file, etc.
*
* @return array
*/
public function getCommandScopeVariables()
{
return $this->commandScopeVariables;
}
/**
* Get unused command-scope magic variables names: __class, __file, etc.
*
* This is used by the shell to unset old command-scope variables after a
* new batch is set.
*
* @return array Array of unused variable names
*/
public function getUnusedCommandScopeVariableNames()
{
return \array_diff(self::$commandScopeNames, \array_keys($this->commandScopeVariables));
}
/**
* Check whether a variable name is a magic variable.
*
* @param string $name
*
* @return bool
*/
public static function isSpecialVariableName($name)
{
return \in_array($name, self::$specialNames) || \in_array($name, self::$commandScopeNames);
}
}