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         $exec = function () use ($__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         if (self::shouldBindClosure()) {
  72             $that = $__psysh__->getBoundObject();
  73             if (is_object($that)) {
  74                 $this->closure = $exec->bindTo($that, get_class($that));
  75             } else {
  76                 $this->closure = $exec->bindTo(null, null);
  77             }
  78
  79             return;
  80         }
  81
  82         $this->closure = $exec;
  83     }
  84
  85     /**
  86      * Go go gadget closure.
  87      *
  88      * @return mixed
  89      */
  90     public function execute()
  91     {
  92         $closure = $this->closure;
  93
  94         return $closure();
  95     }
  96
  97     /**
  98      * Decide whether to bind the execution closure.
  99      *
 100      * @return bool
 101      */
 102     protected static function shouldBindClosure()
 103     {
 104         // skip binding on HHVM < 3.5.0
 105         // see https://github.com/facebook/hhvm/issues/1203
 106         if (defined('HHVM_VERSION')) {
 107             return version_compare(HHVM_VERSION, '3.5.0', '>=');
 108         }
 109
 110         return true;
 111     }
 112 }