initial pass at components and slots

Author: taylorotwell

src/Illuminate/View/Compilers/BladeCompiler.php

@@ -902,6 +902,50 @@ protected function compileIncludeIf($expression)
         return "<?php if (\$__env->exists($expression)) echo \$__env->make($expression, array_except(get_defined_vars(), array('__data', '__path')))->render(); ?>";
     }
 
+    /**
+     * Compile the component statements into valid PHP.
+     *
+     * @param  string  $expression
+     * @return string
+     */
+    protected function compileComponent($expression)
+    {
+        return "<?php \$__env->startComponent{$expression}; ?>";
+    }
+
+    /**
+     * Compile the end component statements into valid PHP.
+     *
+     * @param  string  $expression
+     * @return string
+     */
+    protected function compileEndComponent($expression)
+    {
+        return "<?php echo \$__env->renderComponent(); ?>";
+    }
+
+    /**
+     * Compile the slot statements into valid PHP.
+     *
+     * @param  string  $expression
+     * @return string
+     */
+    protected function compileSlot($expression)
+    {
+        return "<?php \$__env->slot{$expression}; ?>";
+    }
+
+    /**
+     * Compile the end slot statements into valid PHP.
+     *
+     * @param  string  $expression
+     * @return string
+     */
+    protected function compileEndSlot($expression)
+    {
+        return "<?php \$__env->endSlot(); ?>";
+    }
+
     /**
      * Compile the stack statements into the content.
      *

src/Illuminate/View/Factory.php

@@ -7,6 +7,7 @@
 use Illuminate\Support\Arr;
 use Illuminate\Support\Str;
 use InvalidArgumentException;
+use Illuminate\Support\HtmlString;
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\View\Engines\EngineResolver;
 use Illuminate\Contracts\Events\Dispatcher;
@@ -93,6 +94,34 @@ class Factory implements FactoryContract
      */
     protected $sectionStack = [];
 
+    /**
+     * 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 $slotStack = [];
+
     /**
      * The stack of in-progress loops.
      *
@@ -680,6 +709,75 @@ public static function parentPlaceholder()
         return static::$parentPlaceholder;
     }
 
+    /**
+     * Start a component rendering process.
+     *
+     * @param  string  $name
+     * @param  array  $data
+     * @return void
+     */
+    public function startComponent($name, array $data = [])
+    {
+        if (ob_start()) {
+            $this->componentStack[] = $name;
+
+            $this->componentData[$name] = $data;
+
+            $this->slots[$name] = [];
+        }
+    }
+
+    /**
+     * Render the current component.
+     *
+     * @return string
+     */
+    public function renderComponent()
+    {
+        $contents = ob_get_clean();
+
+        $name = array_pop($this->componentStack);
+
+        $baseData = $this->componentData[$name];
+
+        $data = array_merge(
+            $baseData, ['slot' => new HtmlString($contents)], $this->slots[$name]
+        );
+
+        return tap($this->make($name, $data)->render(), function () use ($name) {
+            unset($this->slots[$name]);
+            unset($this->slotStack[$name]);
+            unset($this->componentData[$name]);
+        });
+    }
+
+    /**
+     * Start the slot rendering process.
+     *
+     * @param  string  $name
+     * @return void
+     */
+    public function slot($name)
+    {
+        if (ob_start()) {
+            $this->slots[last($this->componentStack)][$name] = '';
+
+            $this->slotStack[last($this->componentStack)][] = $name;
+        }
+    }
+
+    /**
+     * Save the slot content for rendering.
+     *
+     * @return void
+     */
+    public function endSlot()
+    {
+        $current = last($this->componentStack);
+
+        $this->slots[$current][array_pop($this->slotStack[$current])] = new HtmlString(ob_get_clean());
+    }
+
     /**
      * Start injecting content into a push section.
      *
@@ -729,6 +827,7 @@ protected function extendPush($section, $content)
         if (! isset($this->pushes[$section])) {
             $this->pushes[$section] = [];
         }
+
         if (! isset($this->pushes[$section][$this->renderCount])) {
             $this->pushes[$section][$this->renderCount] = $content;
         } else {