Added "snippet" blade feature

Author: dimitri-koenig

src/Illuminate/View/Compilers/BladeCompiler.php

@@ -31,6 +31,7 @@ class BladeCompiler extends Compiler implements CompilerInterface
         Concerns\CompilesLoops,
         Concerns\CompilesRawPhp,
         Concerns\CompilesSessions,
+        Concerns\CompilesSnippets,
         Concerns\CompilesStacks,
         Concerns\CompilesStyles,
         Concerns\CompilesTranslations,

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

@@ -0,0 +1,73 @@
+<?php
+
+namespace Illuminate\View\Compilers\Concerns;
+
+trait CompilesSnippets
+{
+    /**
+     * Compile the snippet statements into valid PHP.
+     *
+     * @param  string  $expression
+     * @return string
+     */
+    protected function compileSnippet($expression)
+    {
+        [$function, $args] = $this->extractSnippetParts($expression);
+
+        return implode("\n", [
+            "<?php if (! isset(\${$function})):",
+            '$'.$function.' = static function('.$args.') {',
+            '?>',
+        ]);
+    }
+
+    /**
+     * Compile the endsnippet statements into valid PHP.
+     *
+     * @param  string  $expression
+     * @return string
+     */
+    protected function compileEndSnippet($expression)
+    {
+        return implode("\n", [
+            '<?php } ?>',
+            '<?php endif; ?>',
+        ]);
+    }
+
+    /**
+     * Compile the renderSnippet statements into valid PHP.
+     *
+     * @param  string  $expression
+     * @return string
+     */
+    protected function compileRenderSnippet($expression)
+    {
+        [$function, $args] = $this->extractSnippetParts($expression);
+
+        return '<?php echo $'.$function.'('.$args.'); ?>';
+    }
+
+    /**
+     * Analyse the snippet expression and extract the function and optional arguments.
+     *
+     * @param  string  $expression
+     * @return array
+     */
+    protected function extractSnippetParts($expression)
+    {
+        $functionParts = explode(',', $this->stripParentheses($expression));
+
+        $function = trim(array_shift($functionParts), "'\" ");
+
+        if (empty($function)) {
+            $function = 'function';
+        }
+
+        $function = "__snippet_{$function}";
+
+        $args = trim(implode(',', $functionParts));
+
+        return [$function, $args];
+    }
+}

tests/View/Blade/BladeSnippetStatementsTest.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace Illuminate\Tests\View\Blade;
+
+class BladeSnippetStatementsTest extends AbstractBladeTestCase
+{
+    public function testSnippetStatementsAreCompiled()
+    {
+        $string = '@snippet
+default breeze
+@endsnippet
+
+@snippet ("bar")
+breeze with double quotes
+@endsnippet
+
+@snippet (\'foo\', $bar)
+breeze with single quotes {{ $bar }}
+@endsnippet
+
+@snippet (foobar, string $barfoo)
+breeze without quotes {{ $barfoo }}
+@endsnippet';
+        $expected = '<?php if (! isset($__snippet_function)):
+$__snippet_function = static function() {
+?>
+default breeze
+<?php } ?>
+<?php endif; ?>
+
+<?php if (! isset($__snippet_bar)):
+$__snippet_bar = static function() {
+?>
+breeze with double quotes
+<?php } ?>
+<?php endif; ?>
+
+<?php if (! isset($__snippet_foo)):
+$__snippet_foo = static function($bar) {
+?>
+breeze with single quotes <?php echo e($bar); ?>
+
+<?php } ?>
+<?php endif; ?>
+
+<?php if (! isset($__snippet_foobar)):
+$__snippet_foobar = static function(string $barfoo) {
+?>
+breeze without quotes <?php echo e($barfoo); ?>
+
+<?php } ?>
+<?php endif; ?>';
+        $this->assertEquals($expected, $this->compiler->compileString($string));
+    }
+
+    public function testRenderSnippetStatementsAreCompiled()
+    {
+        $string = '@renderSnippet
+
+@renderSnippet ("bar")
+
+@renderSnippet (\'foo\', $bar)
+
+@renderSnippet (foobar, $barfoo)';
+        $expected = '<?php echo $__snippet_function(); ?>
+
+<?php echo $__snippet_bar(); ?>
+
+<?php echo $__snippet_foo($bar); ?>
+
+<?php echo $__snippet_foobar($barfoo); ?>';
+        $this->assertEquals($expected, $this->compiler->compileString($string));
+    }
+}