Add @​context Blade directive (#56146)

Co-authored-by: Martin Bean <martinbean@users.noreply.github.com>

Author: martinbean

src/Illuminate/View/Compilers/BladeCompiler.php

@@ -21,6 +21,7 @@ class BladeCompiler extends Compiler implements CompilerInterface
  Concerns\CompilesComments,
  Concerns\CompilesComponents,
  Concerns\CompilesConditionals,
+ Concerns\CompilesContexts,
  Concerns\CompilesEchos,
  Concerns\CompilesErrors,
  Concerns\CompilesFragments,

src/Illuminate/View/Compilers/Concerns/CompilesContexts.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Illuminate\View\Compilers\Concerns;
+
+trait CompilesContexts
+{
+ /**
+ * Compile the context statements into valid PHP.
+ *
+ * @param string $expression
+ * @return string
+ */
+ protected function compileContext($expression)
+ {
+ $expression = $this->stripParentheses($expression);
+
+ return '<?php $__contextArgs = ['.$expression.'];
+if (context()->has($__contextArgs[0])) :
+if (isset($value)) { $__contextPrevious[] = $value; }
+$value = context()->get($__contextArgs[0]); ?>';
+ }
+
+ /**
+ * Compile the endcontext statements into valid PHP.
+ *
+ * @param string $expression
+ * @return string
+ */
+ protected function compileEndcontext($expression)
+ {
+ return '<?php unset($value);
+if (isset($__contextPrevious) && !empty($__contextPrevious)) { $value = array_pop($__contextPrevious); }
+if (isset($__contextPrevious) && empty($__contextPrevious)) { unset($__contextPrevious); }
+endif;
+unset($__contextArgs); ?>';
+ }
+}

tests/View/Blade/BladeContextTest.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Illuminate\Tests\View\Blade;
+
+class BladeContextTest extends AbstractBladeTestCase
+{
+ public function testContextsAreCompiled()
+ {
+ $string = '
+@context(\'foo\')
+ <span>{{ $value }}</span>
+@endcontext';
+ $expected = '
+<?php $__contextArgs = [\'foo\'];
+if (context()->has($__contextArgs[0])) :
+if (isset($value)) { $__contextPrevious[] = $value; }
+$value = context()->get($__contextArgs[0]); ?>
+ <span><?php echo e($value); ?></span>
+<?php unset($value);
+if (isset($__contextPrevious) && !empty($__contextPrevious)) { $value = array_pop($__contextPrevious); }
+if (isset($__contextPrevious) && empty($__contextPrevious)) { unset($__contextPrevious); }
+endif;
+unset($__contextArgs); ?>';
+
+ $this->assertEquals($expected, $this->compiler->compileString($string));
+ }
+}