Subiendo proyecto completo sin restricciones de git ignore

vendor/laravel/framework/src/Illuminate/Console/Signals.php

@@ -0,0 +1,152 @@
+<?php
+
+namespace Illuminate\Console;
+
+/**
+ * @internal
+ */
+class Signals
+{
+    /**
+     * The signal registry instance.
+     *
+     * @var \Symfony\Component\Console\SignalRegistry\SignalRegistry
+     */
+    protected $registry;
+
+    /**
+     * The signal registry's previous list of handlers.
+     *
+     * @var array<int, array<int, callable>>|null
+     */
+    protected $previousHandlers;
+
+    /**
+     * The current availability resolver, if any.
+     *
+     * @var (callable(): bool)|null
+     */
+    protected static $availabilityResolver;
+
+    /**
+     * Create a new signal registrar instance.
+     *
+     * @param  \Symfony\Component\Console\SignalRegistry\SignalRegistry  $registry
+     * @return void
+     */
+    public function __construct($registry)
+    {
+        $this->registry = $registry;
+
+        $this->previousHandlers = $this->getHandlers();
+    }
+
+    /**
+     * Register a new signal handler.
+     *
+     * @param  int  $signal
+     * @param  callable(int $signal): void  $callback
+     * @return void
+     */
+    public function register($signal, $callback)
+    {
+        $this->previousHandlers[$signal] ??= $this->initializeSignal($signal);
+
+        with($this->getHandlers(), function ($handlers) use ($signal) {
+            $handlers[$signal] ??= $this->initializeSignal($signal);
+
+            $this->setHandlers($handlers);
+        });
+
+        $this->registry->register($signal, $callback);
+
+        with($this->getHandlers(), function ($handlers) use ($signal) {
+            $lastHandlerInserted = array_pop($handlers[$signal]);
+
+            array_unshift($handlers[$signal], $lastHandlerInserted);
+
+            $this->setHandlers($handlers);
+        });
+    }
+
+    /**
+     * Gets the signal's existing handler in array format.
+     *
+     * @return array<int, callable(int $signal): void>
+     */
+    protected function initializeSignal($signal)
+    {
+        return is_callable($existingHandler = pcntl_signal_get_handler($signal))
+            ? [$existingHandler]
+            : null;
+    }
+
+    /**
+     * Unregister the current signal handlers.
+     *
+     * @return array<int, array<int, callable(int $signal): void>>
+     */
+    public function unregister()
+    {
+        $previousHandlers = $this->previousHandlers;
+
+        foreach ($previousHandlers as $signal => $handler) {
+            if (is_null($handler)) {
+                pcntl_signal($signal, SIG_DFL);
+
+                unset($previousHandlers[$signal]);
+            }
+        }
+
+        $this->setHandlers($previousHandlers);
+    }
+
+    /**
+     * Execute the given callback if "signals" should be used and are available.
+     *
+     * @param  callable  $callback
+     * @return void
+     */
+    public static function whenAvailable($callback)
+    {
+        $resolver = static::$availabilityResolver;
+
+        if ($resolver()) {
+            $callback();
+        }
+    }
+
+    /**
+     * Get the registry's handlers.
+     *
+     * @return array<int, array<int, callable>>
+     */
+    protected function getHandlers()
+    {
+        return (fn () => $this->signalHandlers)
+            ->call($this->registry);
+    }
+
+    /**
+     * Set the registry's handlers.
+     *
+     * @param  array<int, array<int, callable(int $signal):void>>  $handlers
+     * @return void
+     */
+    protected function setHandlers($handlers)
+    {
+        (fn () => $this->signalHandlers = $handlers)
+            ->call($this->registry);
+    }
+
+    /**
+     * Set the availability resolver.
+     *
+     * @param  callable(): bool
+     * @return void
+     */
+    public static function resolveAvailabilityUsing($resolver)
+    {
+        static::$availabilityResolver = $resolver;
+    }
+}