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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 InvalidArgumentException; trait ManagesComponents { /** * The components being rendered. * * @var array */ protected $componentStack = []; /** * The original data passed to the component. * * @var array */ protected $componentData = []; /** * 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); $data = $this->componentData(); $view = value($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(); } } /** * 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] ); } /** * Start the slot rendering process. * * @param string $name * @param string|null $content * @return void */ public function slot($name, $content = null) { if (func_num_args() > 2) { throw new InvalidArgumentException('You passed too many arguments to the ['.$name.'] slot.'); } elseif (func_num_args() === 2) { $this->slots[$this->currentComponent()][$name] = $content; } elseif (ob_start()) { $this->slots[$this->currentComponent()][$name] = ''; $this->slotStack[$this->currentComponent()][] = $name; } } /** * Save the slot content for rendering. * * @return void */ public function endSlot() { last($this->componentStack); $currentSlot = array_pop( $this->slotStack[$this->currentComponent()] ); $this->slots[$this->currentComponent()][$currentSlot] = new HtmlString(trim(ob_get_clean())); } /** * Get the index for the current component. * * @return int */ protected function currentComponent() { return count($this->componentStack) - 1; } }