Added placeholder extractor (#16)

* Added placeholder extractor

* cs

Author: Nyholm

src/Visitor/Php/Symfony/FormTypePlaceholder.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of the PHP Translation package.
+ *
+ * (c) PHP Translation team <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Translation\Extractor\Visitor\Php\Symfony;
+
+use PhpParser\Node;
+use PhpParser\Node\Stmt;
+use PhpParser\NodeTraverser;
+use PhpParser\NodeVisitor;
+use Translation\Extractor\Model\SourceLocation;
+use Translation\Extractor\Visitor\Php\BasePHPVisitor;
+
+class FormTypePlaceholder extends BasePHPVisitor implements NodeVisitor
+{
+    public function enterNode(Node $node)
+    {
+        // only Traverse *Type
+        if ($node instanceof Stmt\Class_) {
+            if (substr($node->name, -4) !== 'Type') {
+                return NodeTraverser::DONT_TRAVERSE_CHILDREN;
+            }
+        }
+
+        if (!$node instanceof Node\Expr\Array_) {
+            return;
+        }
+
+        foreach ($node->items as $item) {
+            if (!$item->key instanceof Node\Scalar\String_) {
+                continue;
+            }
+
+            if ($item->key->value === 'placeholder' && $item->value instanceof Node\Scalar\String_) {
+                $this->collection->addLocation(new SourceLocation($item->value->value, $this->getAbsoluteFilePath(), $item->value->getAttribute('startLine')));
+            }
+        }
+    }
+
+    public function leaveNode(Node $node)
+    {
+    }
+
+    public function beforeTraverse(array $nodes)
+    {
+    }
+
+    public function afterTraverse(array $nodes)
+    {
+    }
+}

tests/Functional/Visitor/Php/Symfony/FormTypePlaceholderTest.php

@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of the PHP Translation package.
+ *
+ * (c) PHP Translation team <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Translation\Extractor\Tests\Resources\Php\Symfony;
+
+use Translation\Extractor\Tests\Functional\Visitor\Php\BasePHPVisitorTest;
+use Translation\Extractor\Tests\Resources;
+use Translation\Extractor\Visitor\Php\Symfony\FormTypePlaceholder;
+
+class FormTypePlaceholderTest extends BasePHPVisitorTest
+{
+    public function testExtract()
+    {
+        $collection = $this->getSourceLocations(new FormTypePlaceholder(), Resources\Php\Symfony\PlaceholderFormType::class);
+
+        $this->assertCount(3, $collection);
+        $this->assertEquals('form.placeholder.text', $collection->get(0)->getMessage());
+        $this->assertEquals('form.placeholder.text.but.no.label', $collection->get(1)->getMessage());
+        $this->assertEquals('form.choice_placeholder', $collection->get(2)->getMessage());
+    }
+}

tests/Resources/Php/Symfony/PlaceholderFormType.php

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+<?php
+
+namespace Translation\Extractor\Tests\Resources\Php\Symfony;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\FormBuilderInterface;
+
+class PlaceholderFormType extends AbstractType
+{
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        $builder
+            ->add('field_with_attr_placeholder', 'text', array(
+                'label' => 'field.with.placeholder',
+                'attr' => array('placeholder' => 'form.placeholder.text')
+            ))
+            ->add('field_without_label_with_attr_placeholder', 'text', array(
+                'label' => false,
+                'attr' => array('placeholder' => 'form.placeholder.text.but.no.label')
+            ))
+            ->add('field_placeholder', 'choice', array(
+                'placeholder' => 'form.choice_placeholder'
+            ))
+        ;
+    }
+}