www.aleph1.co.uk Git - yaffs-website/blob - vendor/psy/psysh/src/ExecutionClosure.php

   1 <?php
   2
   3 /*
   4  * This file is part of Psy Shell.
   5  *
   6  * (c) 2012-2018 Justin Hileman
   7  *
   8  * For the full copyright and license information, please view the LICENSE
   9  * file that was distributed with this source code.
  10  */
  11
  12 namespace Psy;
  13
  14 /**
  15  * The Psy Shell's execution scope.
  16  */
  17 class ExecutionClosure
  18 {
  19     const NOOP_INPUT = 'return null;';
  20
  21     private $closure;
  22
  23     /**
  24      * @param Shell $__psysh__
  25      */
  26     public function __construct(Shell $__psysh__)
  27     {
  28         $this->setClosure($__psysh__, function () use ($__psysh__) {
  29             try {
  30                 // Restore execution scope variables
  31                 extract($__psysh__->getScopeVariables(false));
  32
  33                 // Buffer stdout; we'll need it later
  34                 ob_start([$__psysh__, 'writeStdout'], 1);
  35
  36                 // Convert all errors to exceptions
  37                 set_error_handler([$__psysh__, 'handleError']);
  38
  39                 // Evaluate the current code buffer
  40                 $_ = eval($__psysh__->onExecute($__psysh__->flushCode() ?: ExecutionClosure::NOOP_INPUT));
  41             } catch (\Throwable $_e) {
  42                 // Clean up on our way out.
  43                 restore_error_handler();
  44                 if (ob_get_level() > 0) {
  45                     ob_end_clean();
  46                 }
  47
  48                 throw $_e;
  49             } catch (\Exception $_e) {
  50                 // Clean up on our way out.
  51                 restore_error_handler();
  52                 if (ob_get_level() > 0) {
  53                     ob_end_clean();
  54                 }
  55
  56                 throw $_e;
  57             }
  58
  59             // Won't be needing this anymore
  60             restore_error_handler();
  61
  62             // Flush stdout (write to shell output, plus save to magic variable)
  63             ob_end_flush();
  64
  65             // Save execution scope variables for next time
  66             $__psysh__->setScopeVariables(get_defined_vars());
  67
  68             return $_;
  69         });
  70     }
  71
  72     /**
  73      * Set the closure instance.
  74      *
  75      * @param Shell    $psysh
  76      * @param \Closure $closure
  77      */
  78     protected function setClosure(Shell $shell, \Closure $closure)
  79     {
  80         if (self::shouldBindClosure()) {
  81             $that = $shell->getBoundObject();
  82             if (is_object($that)) {
  83                 $closure = $closure->bindTo($that, get_class($that));
  84             } else {
  85                 $closure = $closure->bindTo(null, $shell->getBoundClass());
  86             }
  87         }
  88
  89         $this->closure = $closure;
  90     }
  91
  92     /**
  93      * Go go gadget closure.
  94      *
  95      * @return mixed
  96      */
  97     public function execute()
  98     {
  99         $closure = $this->closure;
 100
 101         return $closure();
 102     }
 103
 104     /**
 105      * Decide whether to bind the execution closure.
 106      *
 107      * @return bool
 108      */
 109     protected static function shouldBindClosure()
 110     {
 111         // skip binding on HHVM < 3.5.0
 112         // see https://github.com/facebook/hhvm/issues/1203
 113         if (defined('HHVM_VERSION')) {
 114             return version_compare(HHVM_VERSION, '3.5.0', '>=');
 115         }
 116
 117         return true;
 118     }
 119 }