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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\Command;
use Psy\CodeCleaner\NoReturnValue;
use Psy\Context;
use Psy\ContextAware;
use Psy\Exception\ErrorException;
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]+$/';
const CLASS_MEMBER = '/^([\\\\\w]+)::(\w+)$/';
const CLASS_STATIC = '/^([\\\\\w]+)::\$(\w+)$/';
const INSTANCE_MEMBER = '/^(\$\w+)(::|->)(\w+)$/';
/**
* 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 $valueName Function, class, variable, constant, method or property name
*
* @return array (class or instance name, member name, kind)
*/
protected function getTarget($valueName)
{
$valueName = \trim($valueName);
$matches = [];
switch (true) {
case \preg_match(self::CLASS_OR_FUNC, $valueName, $matches):
return [$this->resolveName($matches[0], true), null, 0];
case \preg_match(self::CLASS_MEMBER, $valueName, $matches):
return [$this->resolveName($matches[1]), $matches[2], Mirror::CONSTANT | Mirror::METHOD];
case \preg_match(self::CLASS_STATIC, $valueName, $matches):
return [$this->resolveName($matches[1]), $matches[2], Mirror::STATIC_PROPERTY | Mirror::PROPERTY];
case \preg_match(self::INSTANCE_MEMBER, $valueName, $matches):
if ($matches[2] === '->') {
$kind = Mirror::METHOD | Mirror::PROPERTY;
} else {
$kind = Mirror::CONSTANT | Mirror::METHOD;
}
return [$this->resolveObject($matches[1]), $matches[3], $kind];
default:
return [$this->resolveObject($valueName), null, 0];
}
}
/**
* Resolve a class or function name (with the current shell namespace).
*
* @throws ErrorException when `self` or `static` is used in a non-class scope
*
* @param string $name
* @param bool $includeFunctions (default: false)
*
* @return string
*/
protected function resolveName($name, $includeFunctions = false)
{
$shell = $this->getApplication();
// While not *technically* 100% accurate, let's treat `self` and `static` as equivalent.
if (\in_array(\strtolower($name), ['self', 'static'])) {
if ($boundClass = $shell->getBoundClass()) {
return $boundClass;
}
if ($boundObject = $shell->getBoundObject()) {
return \get_class($boundObject);
}
$msg = \sprintf('Cannot use "%s" when no class scope is active', \strtolower($name));
throw new ErrorException($msg, 0, E_USER_ERROR, "eval()'d code", 1);
}
if (\substr($name, 0, 1) === '\\') {
return $name;
}
if ($namespace = $shell->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 $valueName Function, class, variable, constant, method or property name
*
* @return array (value, Reflector)
*/
protected function getTargetAndReflector($valueName)
{
list($value, $member, $kind) = $this->getTarget($valueName);
return [$value, Mirror::get($value, $member, $kind)];
}
/**
* Resolve code to a value in the current scope.
*
* @throws RuntimeException when the code does not return a value in the current scope
*
* @param string $code
*
* @return mixed Variable value
*/
protected function resolveCode($code)
{
try {
$value = $this->getApplication()->execute($code, true);
} catch (\Exception $e) {
// Swallow all exceptions?
}
if (!isset($value) || $value instanceof NoReturnValue) {
throw new RuntimeException('Unknown target: ' . $code);
}
return $value;
}
/**
* Resolve code to an object in the current scope.
*
* @throws RuntimeException when the code resolves to a non-object value
*
* @param string $code
*
* @return object Variable instance
*/
private function resolveObject($code)
{
$value = $this->resolveCode($code);
if (!\is_object($value)) {
throw new RuntimeException('Unable to inspect a non-object');
}
return $value;
}
/**
* @deprecated Use `resolveCode` instead
*
* @param string $name
*
* @return mixed Variable instance
*/
protected function resolveInstance($name)
{
@\trigger_error('`resolveInstance` is deprecated; use `resolveCode` instead.', E_USER_DEPRECATED);
return $this->resolveCode($name);
}
/**
* 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();
}
/**
* Given a Reflector instance, set command-scope variables in the shell
* execution context. This is used to inject magic $__class, $__method and
* $__file variables (as well as a handful of others).
*
* @param \Reflector $reflector
*/
protected function setCommandScopeVariables(\Reflector $reflector)
{
$vars = [];
switch (\get_class($reflector)) {
case 'ReflectionClass':
case 'ReflectionObject':
$vars['__class'] = $reflector->name;
if ($reflector->inNamespace()) {
$vars['__namespace'] = $reflector->getNamespaceName();
}
break;
case 'ReflectionMethod':
$vars['__method'] = \sprintf('%s::%s', $reflector->class, $reflector->name);
$vars['__class'] = $reflector->class;
$classReflector = $reflector->getDeclaringClass();
if ($classReflector->inNamespace()) {
$vars['__namespace'] = $classReflector->getNamespaceName();
}
break;
case 'ReflectionFunction':
$vars['__function'] = $reflector->name;
if ($reflector->inNamespace()) {
$vars['__namespace'] = $reflector->getNamespaceName();
}
break;
case 'ReflectionGenerator':
$funcReflector = $reflector->getFunction();
$vars['__function'] = $funcReflector->name;
if ($funcReflector->inNamespace()) {
$vars['__namespace'] = $funcReflector->getNamespaceName();
}
if ($fileName = $reflector->getExecutingFile()) {
$vars['__file'] = $fileName;
$vars['__line'] = $reflector->getExecutingLine();
$vars['__dir'] = \dirname($fileName);
}
break;
case 'ReflectionProperty':
case 'ReflectionClassConstant':
case 'Psy\Reflection\ReflectionClassConstant':
$classReflector = $reflector->getDeclaringClass();
$vars['__class'] = $classReflector->name;
if ($classReflector->inNamespace()) {
$vars['__namespace'] = $classReflector->getNamespaceName();
}
// no line for these, but this'll do
if ($fileName = $reflector->getDeclaringClass()->getFileName()) {
$vars['__file'] = $fileName;
$vars['__dir'] = \dirname($fileName);
}
break;
case 'Psy\Reflection\ReflectionConstant_':
if ($reflector->inNamespace()) {
$vars['__namespace'] = $reflector->getNamespaceName();
}
break;
}
if ($reflector instanceof \ReflectionClass || $reflector instanceof \ReflectionFunctionAbstract) {
if ($fileName = $reflector->getFileName()) {
$vars['__file'] = $fileName;
$vars['__line'] = $reflector->getStartLine();
$vars['__dir'] = \dirname($fileName);
}
}
$this->context->setCommandScopeVariables($vars);
}
}