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<?php namespace Illuminate\View\Concerns; use Illuminate\Contracts\Support\Htmlable; use Illuminate\Contracts\View\View; use Illuminate\Support\Arr; use Illuminate\Support\HtmlString; use Illuminate\View\ComponentSlot; trait ManagesComponents { /** * The components being rendered. * * @var array */ protected $componentStack = []; /** * The original data passed to the component. * * @var array */ protected $componentData = []; /** * The component data for the component that is currently being rendered. * * @var array */ protected $currentComponentData = []; /** * The slot contents for the component. * * @var array */ protected $slots = []; /** * The names of the slots being rendered. * * @var array */ protected $slotStack = []; /** * Start a component rendering process. * * @param \Illuminate\Contracts\View\View|\Illuminate\Contracts\Support\Htmlable|\Closure|string $view * @param array $data * @return void */ public function startComponent($view, array $data = []) { if (ob_start()) { $this->componentStack[] = $view; $this->componentData[$this->currentComponent()] = $data; $this->slots[$this->currentComponent()] = []; } } /** * Get the first view that actually exists from the given list, and start a component. * * @param array $names * @param array $data * @return void */ public function startComponentFirst(array $names, array $data = []) { $name = Arr::first($names, function ($item) { return $this->exists($item); }); $this->startComponent($name, $data); } /** * Render the current component. * * @return string */ public function renderComponent() { $view = array_pop($this->componentStack); $this->currentComponentData = array_merge( $previousComponentData = $this->currentComponentData, $data = $this->componentData() ); try { $view = value($view, $data); if ($view instanceof View) { return $view->with($data)->render(); } elseif ($view instanceof Htmlable) { return $view->toHtml(); } else { return $this->make($view, $data)->render(); } } finally { $this->currentComponentData = $previousComponentData; } } /** * Get the data for the given component. * * @return array */ protected function componentData() { $defaultSlot = new HtmlString(trim(ob_get_clean())); $slots = array_merge([ '__default' => $defaultSlot, ], $this->slots[count($this->componentStack)]); return array_merge( $this->componentData[count($this->componentStack)], ['slot' => $defaultSlot], $this->slots[count($this->componentStack)], ['__laravel_slots' => $slots] ); } /** * Get an item from the component data that exists above the current component. * * @param string $key * @param mixed $default * @return mixed|null */ public function getConsumableComponentData($key, $default = null) { if (array_key_exists($key, $this->currentComponentData)) { return $this->currentComponentData[$key]; } $currentComponent = count($this->componentStack); if ($currentComponent === 0) { return value($default); } for ($i = $currentComponent - 1; $i >= 0; $i--) { $data = $this->componentData[$i] ?? []; if (array_key_exists($key, $data)) { return $data[$key]; } } return value($default); } /** * Start the slot rendering process. * * @param string $name * @param string|null $content * @param array $attributes * @return void */ public function slot($name, $content = null, $attributes = []) { if (func_num_args() === 2 || $content !== null) { $this->slots[$this->currentComponent()][$name] = $content; } elseif (ob_start()) { $this->slots[$this->currentComponent()][$name] = ''; $this->slotStack[$this->currentComponent()][] = [$name, $attributes]; } } /** * Save the slot content for rendering. * * @return void */ public function endSlot() { last($this->componentStack); $currentSlot = array_pop( $this->slotStack[$this->currentComponent()] ); [$currentName, $currentAttributes] = $currentSlot; $this->slots[$this->currentComponent()][$currentName] = new ComponentSlot( trim(ob_get_clean()), $currentAttributes ); } /** * Get the index for the current component. * * @return int */ protected function currentComponent() { return count($this->componentStack) - 1; } /** * Flush all of the component state. * * @return void */ protected function flushComponents() { $this->componentStack = []; $this->componentData = []; $this->currentComponentData = []; } }