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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\ExecutionLoop;
use Psy\Configuration;
use Psy\Exception\BreakException;
use Psy\Exception\ThrowUpException;
use Psy\Exception\TypeErrorException;
use Psy\Shell;
/**
* The Psy Shell execution loop.
*/
class Loop
{
const NOOP_INPUT = 'return null;';
/**
* Loop constructor.
*
* The non-forking loop doesn't have much use for Configuration, so we'll
* just ignore it.
*
* @param Configuration $config
*/
public function __construct(Configuration $config)
{
// don't need this
}
/**
* Run the execution loop.
*
* @throws ThrowUpException if thrown by the `throw-up` command.
*
* @param Shell $shell
*/
public function run(Shell $shell)
{
$loop = function ($__psysh__) {
// Load user-defined includes
set_error_handler(array($__psysh__, 'handleError'));
try {
foreach ($__psysh__->getIncludes() as $__psysh_include__) {
include $__psysh_include__;
}
} catch (\Exception $_e) {
$__psysh__->writeException($_e);
}
restore_error_handler();
unset($__psysh_include__);
extract($__psysh__->getScopeVariables());
do {
$__psysh__->beforeLoop();
$__psysh__->setScopeVariables(get_defined_vars());
try {
// read a line, see if we should eval
$__psysh__->getInput();
// evaluate the current code buffer
ob_start(
array($__psysh__, 'writeStdout'),
version_compare(PHP_VERSION, '5.4', '>=') ? 1 : 2
);
set_error_handler(array($__psysh__, 'handleError'));
$_ = eval($__psysh__->flushCode() ?: Loop::NOOP_INPUT);
restore_error_handler();
ob_end_flush();
$__psysh__->writeReturnValue($_);
} catch (BreakException $_e) {
restore_error_handler();
if (ob_get_level() > 0) {
ob_end_clean();
}
$__psysh__->writeException($_e);
return;
} catch (ThrowUpException $_e) {
restore_error_handler();
if (ob_get_level() > 0) {
ob_end_clean();
}
$__psysh__->writeException($_e);
throw $_e;
} catch (\TypeError $_e) {
restore_error_handler();
if (ob_get_level() > 0) {
ob_end_clean();
}
$__psysh__->writeException(TypeErrorException::fromTypeError($_e));
} catch (\Exception $_e) {
restore_error_handler();
if (ob_get_level() > 0) {
ob_end_clean();
}
$__psysh__->writeException($_e);
}
$__psysh__->afterLoop();
} while (true);
};
// bind the closure to $this from the shell scope variables...
if (self::bindLoop()) {
$that = null;
try {
$that = $shell->getScopeVariable('this');
} catch (\InvalidArgumentException $e) {
// well, it was worth a shot
}
if (is_object($that)) {
$loop = $loop->bindTo($that, get_class($that));
} else {
$loop = $loop->bindTo(null, null);
}
}
$loop($shell);
}
/**
* A beforeLoop callback.
*
* This is executed at the start of each loop iteration. In the default
* (non-forking) loop implementation, this is a no-op.
*/
public function beforeLoop()
{
// no-op
}
/**
* A afterLoop callback.
*
* This is executed at the end of each loop iteration. In the default
* (non-forking) loop implementation, this is a no-op.
*/
public function afterLoop()
{
// no-op
}
/**
* Decide whether to bind the execution loop.
*
* @return bool
*/
protected static function bindLoop()
{
// 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 version_compare(PHP_VERSION, '5.4', '>=');
}
}