bug #19983 [TwigBridge] removed Twig null nodes (deprecated as of Twig 1.25) (fabpot)

This PR was merged into the 2.7 branch.

Discussion
----------

[TwigBridge] removed Twig null nodes (deprecated as of Twig 1.25)

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes (more about removing deprecation notices from newer versions of Twig)
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a (see twigphp/Twig#2123)
| License       | MIT
| Doc PR        | n/a

Commits
-------

12350c2 [TwigBridge] removed Twig null nodes (deprecated as of Twig 1.25)

src/Symfony/Bridge/Twig/Node/DumpNode.php

@@ -20,7 +20,12 @@ class DumpNode extends \Twig_Node
 
     public function __construct($varPrefix, \Twig_Node $values = null, $lineno, $tag = null)
     {
-        parent::__construct(array('values' => $values), array(), $lineno, $tag);
+        $nodes = array();
+        if (null !== $values) {
+            $nodes['values'] = $values;
+        }
+
+        parent::__construct($nodes, array(), $lineno, $tag);
         $this->varPrefix = $varPrefix;
     }
 
@@ -33,9 +38,7 @@ class DumpNode extends \Twig_Node
             ->write("if (\$this->env->isDebug()) {\n")
             ->indent();
 
-        $values = $this->getNode('values');
+        if (!$this->hasNode('values')) {
-
-        if (null === $values) {
             // remove embedded templates (macros) from the context
             $compiler
                 ->write(sprintf('$%svars = array();'."\n", $this->varPrefix))
@@ -50,7 +53,7 @@ class DumpNode extends \Twig_Node
                 ->write("}\n")
                 ->addDebugInfo($this)
                 ->write(sprintf('\Symfony\Component\VarDumper\VarDumper::dump($%svars);'."\n", $this->varPrefix));
-        } elseif (1 === $values->count()) {
+        } elseif (($values = $this->getNode('values')) && 1 === $values->count()) {
             $compiler
                 ->addDebugInfo($this)
                 ->write('\Symfony\Component\VarDumper\VarDumper::dump(')

src/Symfony/Bridge/Twig/Node/StopwatchNode.php

@@ -18,7 +18,7 @@ namespace Symfony\Bridge\Twig\Node;
  */
 class StopwatchNode extends \Twig_Node
 {
-    public function __construct(\Twig_Node $name, $body, \Twig_Node_Expression_AssignName $var, $lineno = 0, $tag = null)
+    public function __construct(\Twig_Node $name, \Twig_Node $body, \Twig_Node_Expression_AssignName $var, $lineno = 0, $tag = null)
     {
         parent::__construct(array('body' => $body, 'name' => $name, 'var' => $var), array(), $lineno, $tag);
     }

src/Symfony/Bridge/Twig/Node/TransNode.php

@@ -18,7 +18,21 @@ class TransNode extends \Twig_Node
 {
     public function __construct(\Twig_Node $body, \Twig_Node $domain = null, \Twig_Node_Expression $count = null, \Twig_Node_Expression $vars = null, \Twig_Node_Expression $locale = null, $lineno = 0, $tag = null)
     {
-        parent::__construct(array('count' => $count, 'body' => $body, 'domain' => $domain, 'vars' => $vars, 'locale' => $locale), array(), $lineno, $tag);
+        $nodes = array('body' => $body);
+        if (null !== $domain) {
+            $nodes['domain'] = $domain;
+        }
+        if (null !== $count) {
+            $nodes['count'] = $count;
+        }
+        if (null !== $vars) {
+            $nodes['vars'] = $vars;
+        }
+        if (null !== $locale) {
+            $nodes['locale'] = $locale;
+        }
+
+        parent::__construct($nodes, array(), $lineno, $tag);
     }
 
     /**
@@ -30,15 +44,14 @@ class TransNode extends \Twig_Node
     {
         $compiler->addDebugInfo($this);
 
-        $vars = $this->getNode('vars');
         $defaults = new \Twig_Node_Expression_Array(array(), -1);
-        if ($vars instanceof \Twig_Node_Expression_Array) {
+        if ($this->hasNode('vars') && ($vars = $this->getNode('vars')) instanceof \Twig_Node_Expression_Array) {
             $defaults = $this->getNode('vars');
             $vars = null;
         }
         list($msg, $defaults) = $this->compileString($this->getNode('body'), $defaults, (bool) $vars);
 
-        $method = null === $this->getNode('count') ? 'trans' : 'transChoice';
+        $method = !$this->hasNode('count') ? 'trans' : 'transChoice';
 
         $compiler
             ->write('echo $this->env->getExtension(\'translator\')->getTranslator()->'.$method.'(')
@@ -47,7 +60,7 @@ class TransNode extends \Twig_Node
 
         $compiler->raw(', ');
 
-        if (null !== $this->getNode('count')) {
+        if ($this->hasNode('count')) {
             $compiler
                 ->subcompile($this->getNode('count'))
                 ->raw(', ')
@@ -68,13 +81,13 @@ class TransNode extends \Twig_Node
 
         $compiler->raw(', ');
 
-        if (null === $this->getNode('domain')) {
+        if (!$this->hasNode('domain')) {
             $compiler->repr('messages');
         } else {
             $compiler->subcompile($this->getNode('domain'));
         }
 
-        if (null !== $this->getNode('locale')) {
+        if ($this->hasNode('locale')) {
             $compiler
                 ->raw(', ')
                 ->subcompile($this->getNode('locale'))
@@ -98,7 +111,7 @@ class TransNode extends \Twig_Node
         foreach ($matches[1] as $var) {
             $key = new \Twig_Node_Expression_Constant('%'.$var.'%', $body->getLine());
             if (!$vars->hasElement($key)) {
-                if ('count' === $var && null !== $this->getNode('count')) {
+                if ('count' === $var && $this->hasNode('count')) {
                     $vars->addElement($this->getNode('count'), $key);
                 } else {
                     $varExpr = new \Twig_Node_Expression_Name($var, $body->getLine());

src/Symfony/Bridge/Twig/NodeVisitor/TranslationDefaultDomainNodeVisitor.php

@@ -78,7 +78,7 @@ class TranslationDefaultDomainNodeVisitor extends \Twig_BaseNodeVisitor
                 }
             }
         } elseif ($node instanceof TransNode) {
-            if (null === $node->getNode('domain')) {
+            if (!$node->hasNode('domain')) {
                 $node->setNode('domain', $this->scope->get('domain'));
             }
         }

src/Symfony/Bridge/Twig/NodeVisitor/TranslationNodeVisitor.php

@@ -75,7 +75,7 @@ class TranslationNodeVisitor extends \Twig_BaseNodeVisitor
             // extract trans nodes
             $this->messages[] = array(
                 $node->getNode('body')->getAttribute('data'),
-                $this->getReadDomainFromNode($node->getNode('domain')),
+                $node->hasNode('domain') ? $this->getReadDomainFromNode($node->getNode('domain')) : null,
             );
         }
 
@@ -122,12 +122,8 @@ class TranslationNodeVisitor extends \Twig_BaseNodeVisitor
      *
      * @return string|null
      */
-    private function getReadDomainFromNode(\Twig_Node $node = null)
+    private function getReadDomainFromNode(\Twig_Node $node)
     {
-        if (null === $node) {
-            return;
-        }
-
         if ($node instanceof \Twig_Node_Expression_Constant) {
             return $node->getAttribute('value');
         }