Syntax.php

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<?php

/*
 * This file is part of Twig.
 *
 * (c) Fabien Potencier
 * (c) Armin Ronacher
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

class Twig_Error_Syntax extends Twig_Error
{
    public function addSuggestions($name, array $items)
    {
        if (!$alternatives = self::computeAlternatives($name, $items)) {
            return;
        }

        $this->appendMessage(sprintf(' Did you mean "%s"?', implode('", "', $alternatives)));
    }

    public static function computeAlternatives($name, $items)
    {
        $alternatives = array();
        foreach ($items as $item) {
            $lev = levenshtein($name, $item);
            if ($lev <= strlen($name) / 3 || false !== strpos($item, $name)) {
                $alternatives[$item] = $lev;
            }
        }
        asort($alternatives);

        return array_keys($alternatives);
    }
}

class_alias('Twig_Error_Syntax', 'Twig\Error\SyntaxError', false);