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vendor/laravel/framework/src/Illuminate/Pipeline/Hub.php

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+<?php
+
+namespace Illuminate\Pipeline;
+
+use Closure;
+use Illuminate\Contracts\Container\Container;
+use Illuminate\Contracts\Pipeline\Hub as HubContract;
+
+class Hub implements HubContract
+{
+    /**
+     * The container implementation.
+     *
+     * @var \Illuminate\Contracts\Container\Container|null
+     */
+    protected $container;
+
+    /**
+     * All of the available pipelines.
+     *
+     * @var array
+     */
+    protected $pipelines = [];
+
+    /**
+     * Create a new Hub instance.
+     *
+     * @param  \Illuminate\Contracts\Container\Container|null  $container
+     * @return void
+     */
+    public function __construct(Container $container = null)
+    {
+        $this->container = $container;
+    }
+
+    /**
+     * Define the default named pipeline.
+     *
+     * @param  \Closure  $callback
+     * @return void
+     */
+    public function defaults(Closure $callback)
+    {
+        return $this->pipeline('default', $callback);
+    }
+
+    /**
+     * Define a new named pipeline.
+     *
+     * @param  string  $name
+     * @param  \Closure  $callback
+     * @return void
+     */
+    public function pipeline($name, Closure $callback)
+    {
+        $this->pipelines[$name] = $callback;
+    }
+
+    /**
+     * Send an object through one of the available pipelines.
+     *
+     * @param  mixed  $object
+     * @param  string|null  $pipeline
+     * @return mixed
+     */
+    public function pipe($object, $pipeline = null)
+    {
+        $pipeline = $pipeline ?: 'default';
+
+        return call_user_func(
+            $this->pipelines[$pipeline], new Pipeline($this->container), $object
+        );
+    }
+}

vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php

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+<?php
+
+namespace Illuminate\Pipeline;
+
+use Closure;
+use RuntimeException;
+use Illuminate\Contracts\Container\Container;
+use Illuminate\Contracts\Pipeline\Pipeline as PipelineContract;
+
+class Pipeline implements PipelineContract
+{
+    /**
+     * The container implementation.
+     *
+     * @var \Illuminate\Contracts\Container\Container
+     */
+    protected $container;
+
+    /**
+     * The object being passed through the pipeline.
+     *
+     * @var mixed
+     */
+    protected $passable;
+
+    /**
+     * The array of class pipes.
+     *
+     * @var array
+     */
+    protected $pipes = [];
+
+    /**
+     * The method to call on each pipe.
+     *
+     * @var string
+     */
+    protected $method = 'handle';
+
+    /**
+     * Create a new class instance.
+     *
+     * @param  \Illuminate\Contracts\Container\Container|null  $container
+     * @return void
+     */
+    public function __construct(Container $container = null)
+    {
+        $this->container = $container;
+    }
+
+    /**
+     * Set the object being sent through the pipeline.
+     *
+     * @param  mixed  $passable
+     * @return $this
+     */
+    public function send($passable)
+    {
+        $this->passable = $passable;
+
+        return $this;
+    }
+
+    /**
+     * Set the array of pipes.
+     *
+     * @param  array|mixed  $pipes
+     * @return $this
+     */
+    public function through($pipes)
+    {
+        $this->pipes = is_array($pipes) ? $pipes : func_get_args();
+
+        return $this;
+    }
+
+    /**
+     * Set the method to call on the pipes.
+     *
+     * @param  string  $method
+     * @return $this
+     */
+    public function via($method)
+    {
+        $this->method = $method;
+
+        return $this;
+    }
+
+    /**
+     * Run the pipeline with a final destination callback.
+     *
+     * @param  \Closure  $destination
+     * @return mixed
+     */
+    public function then(Closure $destination)
+    {
+        $pipeline = array_reduce(
+            array_reverse($this->pipes), $this->carry(), $this->prepareDestination($destination)
+        );
+
+        return $pipeline($this->passable);
+    }
+
+    /**
+     * Get the final piece of the Closure onion.
+     *
+     * @param  \Closure  $destination
+     * @return \Closure
+     */
+    protected function prepareDestination(Closure $destination)
+    {
+        return function ($passable) use ($destination) {
+            return $destination($passable);
+        };
+    }
+
+    /**
+     * Get a Closure that represents a slice of the application onion.
+     *
+     * @return \Closure
+     */
+    protected function carry()
+    {
+        return function ($stack, $pipe) {
+            return function ($passable) use ($stack, $pipe) {
+                if ($pipe instanceof Closure) {
+                    // If the pipe is an instance of a Closure, we will just call it directly but
+                    // otherwise we'll resolve the pipes out of the container and call it with
+                    // the appropriate method and arguments, returning the results back out.
+                    return $pipe($passable, $stack);
+                } elseif (! is_object($pipe)) {
+                    list($name, $parameters) = $this->parsePipeString($pipe);
+
+                    // If the pipe is a string we will parse the string and resolve the class out
+                    // of the dependency injection container. We can then build a callable and
+                    // execute the pipe function giving in the parameters that are required.
+                    $pipe = $this->getContainer()->make($name);
+
+                    $parameters = array_merge([$passable, $stack], $parameters);
+                } else {
+                    // If the pipe is already an object we'll just make a callable and pass it to
+                    // the pipe as-is. There is no need to do any extra parsing and formatting
+                    // since the object we're given was already a fully instantiated object.
+                    $parameters = [$passable, $stack];
+                }
+
+                return $pipe->{$this->method}(...$parameters);
+            };
+        };
+    }
+
+    /**
+     * Parse full pipe string to get name and parameters.
+     *
+     * @param  string $pipe
+     * @return array
+     */
+    protected function parsePipeString($pipe)
+    {
+        list($name, $parameters) = array_pad(explode(':', $pipe, 2), 2, []);
+
+        if (is_string($parameters)) {
+            $parameters = explode(',', $parameters);
+        }
+
+        return [$name, $parameters];
+    }
+
+    /**
+     * Get the container instance.
+     *
+     * @return \Illuminate\Contracts\Container\Container
+     * @throws \RuntimeException
+     */
+    protected function getContainer()
+    {
+        if (! $this->container) {
+            throw new RuntimeException('A container instance has not been passed to the Pipeline.');
+        }
+
+        return $this->container;
+    }
+}

vendor/laravel/framework/src/Illuminate/Pipeline/PipelineServiceProvider.php

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+<?php
+
+namespace Illuminate\Pipeline;
+
+use Illuminate\Support\ServiceProvider;
+use Illuminate\Contracts\Pipeline\Hub as PipelineHubContract;
+
+class PipelineServiceProvider extends ServiceProvider
+{
+    /**
+     * Indicates if loading of the provider is deferred.
+     *
+     * @var bool
+     */
+    protected $defer = true;
+
+    /**
+     * Register the service provider.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        $this->app->singleton(
+            PipelineHubContract::class, Hub::class
+        );
+    }
+
+    /**
+     * Get the services provided by the provider.
+     *
+     * @return array
+     */
+    public function provides()
+    {
+        return [
+            PipelineHubContract::class,
+        ];
+    }
+}

vendor/laravel/framework/src/Illuminate/Pipeline/composer.json

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+{
+    "name": "illuminate/pipeline",
+    "description": "The Illuminate Pipeline package.",
+    "license": "MIT",
+    "homepage": "https://laravel.com",
+    "support": {
+        "issues": "https://github.com/laravel/framework/issues",
+        "source": "https://github.com/laravel/framework"
+    },
+    "authors": [
+        {
+            "name": "Taylor Otwell",
+            "email": "taylor@laravel.com"
+        }
+    ],
+    "require": {
+        "php": ">=5.6.4",
+        "illuminate/contracts": "5.4.*",
+        "illuminate/support": "5.4.*"
+    },
+    "autoload": {
+        "psr-4": {
+            "Illuminate\\Pipeline\\": ""
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "5.4-dev"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "minimum-stability": "dev"
+}