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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 Psy Shell's execution scope.
*/
class ExecutionClosure
{
const NOOP_INPUT = 'return null;';
private $closure;
/**
* @param Shell $__psysh__
*/
public function __construct(Shell $__psysh__)
{
$this->setClosure($__psysh__, function () use ($__psysh__) {
try {
// Restore execution scope variables
\extract($__psysh__->getScopeVariables(false));
// Buffer stdout; we'll need it later
\ob_start([$__psysh__, 'writeStdout'], 1);
// Convert all errors to exceptions
\set_error_handler([$__psysh__, 'handleError']);
// Evaluate the current code buffer
$_ = eval($__psysh__->onExecute($__psysh__->flushCode() ?: ExecutionClosure::NOOP_INPUT));
} catch (\Throwable $_e) {
// Clean up on our way out.
\restore_error_handler();
if (\ob_get_level() > 0) {
\ob_end_clean();
}
throw $_e;
} catch (\Exception $_e) {
// Clean up on our way out.
\restore_error_handler();
if (\ob_get_level() > 0) {
\ob_end_clean();
}
throw $_e;
}
// Won't be needing this anymore
\restore_error_handler();
// Flush stdout (write to shell output, plus save to magic variable)
\ob_end_flush();
// Save execution scope variables for next time
$__psysh__->setScopeVariables(\get_defined_vars());
return $_;
});
}
/**
* Set the closure instance.
*
* @param Shell $psysh
* @param \Closure $closure
*/
protected function setClosure(Shell $shell, \Closure $closure)
{
if (self::shouldBindClosure()) {
$that = $shell->getBoundObject();
if (\is_object($that)) {
$closure = $closure->bindTo($that, \get_class($that));
} else {
$closure = $closure->bindTo(null, $shell->getBoundClass());
}
}
$this->closure = $closure;
}
/**
* Go go gadget closure.
*
* @return mixed
*/
public function execute()
{
$closure = $this->closure;
return $closure();
}
/**
* Decide whether to bind the execution closure.
*
* @return bool
*/
protected static function shouldBindClosure()
{
// skip binding on HHVM < 3.5.0
// see https://github.com/facebook/hhvm/issues/1203
if (\defined('HHVM_VERSION')) {
return \version_compare(HHVM_VERSION, '3.5.0', '>=');
}
return true;
}
}