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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\Command;
use Psy\Context;
use Psy\ContextAware;
use Psy\Exception\RuntimeException;
use Psy\Util\Mirror;
/**
* An abstract command with helpers for inspecting the current context.
*/
abstract class ReflectingCommand extends Command implements ContextAware
{
const CLASS_OR_FUNC = '/^[\\\\\w]+$/';
const INSTANCE = '/^\$(\w+)$/';
const CLASS_MEMBER = '/^([\\\\\w]+)::(\w+)$/';
const CLASS_STATIC = '/^([\\\\\w]+)::\$(\w+)$/';
const INSTANCE_MEMBER = '/^\$(\w+)(::|->)(\w+)$/';
const INSTANCE_STATIC = '/^\$(\w+)::\$(\w+)$/';
/**
* Context instance (for ContextAware interface).
*
* @var Context
*/
protected $context;
/**
* ContextAware interface.
*
* @param Context $context
*/
public function setContext(Context $context)
{
$this->context = $context;
}
/**
* Get the target for a value.
*
* @throws \InvalidArgumentException when the value specified can't be resolved.
*
* @param string $valueName Function, class, variable, constant, method or property name.
* @param bool $classOnly True if the name should only refer to a class, function or instance
*
* @return array (class or instance name, member name, kind)
*/
protected function getTarget($valueName, $classOnly = false)
{
$valueName = trim($valueName);
$matches = array();
switch (true) {
case preg_match(self::CLASS_OR_FUNC, $valueName, $matches):
return array($this->resolveName($matches[0], true), null, 0);
case preg_match(self::INSTANCE, $valueName, $matches):
return array($this->resolveInstance($matches[1]), null, 0);
case !$classOnly && preg_match(self::CLASS_MEMBER, $valueName, $matches):
return array($this->resolveName($matches[1]), $matches[2], Mirror::CONSTANT | Mirror::METHOD);
case !$classOnly && preg_match(self::CLASS_STATIC, $valueName, $matches):
return array($this->resolveName($matches[1]), $matches[2], Mirror::STATIC_PROPERTY | Mirror::PROPERTY);
case !$classOnly && preg_match(self::INSTANCE_MEMBER, $valueName, $matches):
if ($matches[2] === '->') {
$kind = Mirror::METHOD | Mirror::PROPERTY;
} else {
$kind = Mirror::CONSTANT | Mirror::METHOD;
}
return array($this->resolveInstance($matches[1]), $matches[3], $kind);
case !$classOnly && preg_match(self::INSTANCE_STATIC, $valueName, $matches):
return array($this->resolveInstance($matches[1]), $matches[2], Mirror::STATIC_PROPERTY);
default:
throw new RuntimeException('Unknown target: ' . $valueName);
}
}
/**
* Resolve a class or function name (with the current shell namespace).
*
* @param string $name
* @param bool $includeFunctions (default: false)
*
* @return string
*/
protected function resolveName($name, $includeFunctions = false)
{
if (substr($name, 0, 1) === '\\') {
return $name;
}
if ($namespace = $this->getApplication()->getNamespace()) {
$fullName = $namespace . '\\' . $name;
if (class_exists($fullName) || interface_exists($fullName) || ($includeFunctions && function_exists($fullName))) {
return $fullName;
}
}
return $name;
}
/**
* Get a Reflector and documentation for a function, class or instance, constant, method or property.
*
* @param string $valueName Function, class, variable, constant, method or property name.
* @param bool $classOnly True if the name should only refer to a class, function or instance
*
* @return array (value, Reflector)
*/
protected function getTargetAndReflector($valueName, $classOnly = false)
{
list($value, $member, $kind) = $this->getTarget($valueName, $classOnly);
return array($value, Mirror::get($value, $member, $kind));
}
/**
* Return a variable instance from the current scope.
*
* @throws \InvalidArgumentException when the requested variable does not exist in the current scope.
*
* @param string $name
*
* @return mixed Variable instance.
*/
protected function resolveInstance($name)
{
$value = $this->getScopeVariable($name);
if (!is_object($value)) {
throw new RuntimeException('Unable to inspect a non-object');
}
return $value;
}
/**
* Get a variable from the current shell scope.
*
* @param string $name
*
* @return mixed
*/
protected function getScopeVariable($name)
{
return $this->context->get($name);
}
/**
* Get all scope variables from the current shell scope.
*
* @return array
*/
protected function getScopeVariables()
{
return $this->context->getAll();
}
}