Started on internationalization (i18n)

inc/contrib/Twig/Extensions/TokenParser/Trans.php

@@ -0,0 +1,80 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_TokenParser_Trans extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+        $stream = $this->parser->getStream();
+        $count = null;
+        $plural = null;
+
+        if (!$stream->test(Twig_Token::BLOCK_END_TYPE)) {
+            $body = $this->parser->getExpressionParser()->parseExpression();
+        } else {
+            $stream->expect(Twig_Token::BLOCK_END_TYPE);
+            $body = $this->parser->subparse(array($this, 'decideForFork'));
+            if ('plural' === $stream->next()->getValue()) {
+                $count = $this->parser->getExpressionParser()->parseExpression();
+                $stream->expect(Twig_Token::BLOCK_END_TYPE);
+                $plural = $this->parser->subparse(array($this, 'decideForEnd'), true);
+            }
+        }
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        $this->checkTransString($body, $lineno);
+
+        return new Twig_Extensions_Node_Trans($body, $plural, $count, $lineno, $this->getTag());
+    }
+
+    public function decideForFork($token)
+    {
+        return $token->test(array('plural', 'endtrans'));
+    }
+
+    public function decideForEnd($token)
+    {
+        return $token->test('endtrans');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @param string The tag name
+     */
+    public function getTag()
+    {
+        return 'trans';
+    }
+
+    protected function checkTransString(Twig_NodeInterface $body, $lineno)
+    {
+        foreach ($body as $i => $node) {
+            if (
+                $node instanceof Twig_Node_Text
+                ||
+                ($node instanceof Twig_Node_Print && $node->getNode('expr') instanceof Twig_Node_Expression_Name)
+            ) {
+                continue;
+            }
+
+            throw new Twig_Error_Syntax(sprintf('The text to be translated with "trans" can only contain references to simple variables'), $lineno);
+        }
+    }
+}