120 lines
3.0 KiB
PHP
120 lines
3.0 KiB
PHP
<?php
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/*
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* This file is part of Psy Shell.
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*
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* (c) 2012-2018 Justin Hileman
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Psy;
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/**
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* The Psy Shell's execution scope.
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*/
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class ExecutionClosure
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{
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const NOOP_INPUT = 'return null;';
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private $closure;
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/**
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* @param Shell $__psysh__
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*/
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public function __construct(Shell $__psysh__)
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{
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$this->setClosure($__psysh__, function () use ($__psysh__) {
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try {
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// Restore execution scope variables
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\extract($__psysh__->getScopeVariables(false));
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// Buffer stdout; we'll need it later
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\ob_start([$__psysh__, 'writeStdout'], 1);
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// Convert all errors to exceptions
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\set_error_handler([$__psysh__, 'handleError']);
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// Evaluate the current code buffer
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$_ = eval($__psysh__->onExecute($__psysh__->flushCode() ?: ExecutionClosure::NOOP_INPUT));
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} catch (\Throwable $_e) {
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// Clean up on our way out.
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\restore_error_handler();
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if (\ob_get_level() > 0) {
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\ob_end_clean();
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}
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throw $_e;
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} catch (\Exception $_e) {
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// Clean up on our way out.
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\restore_error_handler();
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if (\ob_get_level() > 0) {
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\ob_end_clean();
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}
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throw $_e;
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}
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// Won't be needing this anymore
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\restore_error_handler();
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// Flush stdout (write to shell output, plus save to magic variable)
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\ob_end_flush();
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// Save execution scope variables for next time
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$__psysh__->setScopeVariables(\get_defined_vars());
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return $_;
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});
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}
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/**
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* Set the closure instance.
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*
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* @param Shell $psysh
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* @param \Closure $closure
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*/
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protected function setClosure(Shell $shell, \Closure $closure)
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{
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if (self::shouldBindClosure()) {
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$that = $shell->getBoundObject();
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if (\is_object($that)) {
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$closure = $closure->bindTo($that, \get_class($that));
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} else {
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$closure = $closure->bindTo(null, $shell->getBoundClass());
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}
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}
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$this->closure = $closure;
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}
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/**
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* Go go gadget closure.
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*
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* @return mixed
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*/
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public function execute()
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{
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$closure = $this->closure;
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return $closure();
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}
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/**
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* Decide whether to bind the execution closure.
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*
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* @return bool
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*/
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protected static function shouldBindClosure()
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{
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// skip binding on HHVM < 3.5.0
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// see https://github.com/facebook/hhvm/issues/1203
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if (\defined('HHVM_VERSION')) {
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return \version_compare(HHVM_VERSION, '3.5.0', '>=');
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}
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return true;
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}
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}
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