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<?php
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/*
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 * This file is part of Twig.
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 *
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 * (c) 2009 Fabien Potencier
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 * (c) 2009 Armin Ronacher
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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class Twig_Node_Expression_Name extends Twig_Node_Expression
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{
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    protected $specialVars = array(
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        '_self'    => '$this',
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        '_context' => '$context',
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        '_charset' => '$this->env->getCharset()',
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    );
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    public function __construct($name, $lineno)
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    {
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        parent::__construct(array(), array('name' => $name, 'is_defined_test' => false, 'ignore_strict_check' => false, 'always_defined' => false), $lineno);
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    }
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    public function compile(Twig_Compiler $compiler)
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    {
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        $name = $this->getAttribute('name');
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        if ($this->getAttribute('is_defined_test')) {
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            if ($this->isSpecial()) {
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                $compiler->repr(true);
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            } else {
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                $compiler->raw('array_key_exists(')->repr($name)->raw(', $context)');
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            }
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        } elseif ($this->isSpecial()) {
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            $compiler->raw($this->specialVars[$name]);
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        } elseif ($this->getAttribute('always_defined')) {
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            $compiler
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                ->raw('$context[')
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                ->string($name)
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                ->raw(']')
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            ;
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        } else {
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            // remove the non-PHP 5.4 version when PHP 5.3 support is dropped
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            // as the non-optimized version is just a workaround for slow ternary operator
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            // when the context has a lot of variables
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            if (version_compare(phpversion(), '5.4.0RC1', '>=')) {
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                // PHP 5.4 ternary operator performance was optimized
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                $compiler
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                    ->raw('(isset($context[')
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                    ->string($name)
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                    ->raw(']) ? $context[')
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                    ->string($name)
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                    ->raw('] : ')
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                ;
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                if ($this->getAttribute('ignore_strict_check') || !$compiler->getEnvironment()->isStrictVariables()) {
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                    $compiler->raw('null)');
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                } else {
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                    $compiler->raw('$this->getContext($context, ')->string($name)->raw('))');
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                }
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            } else {
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                $compiler
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                    ->raw('$this->getContext($context, ')
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                    ->string($name)
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                ;
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                if ($this->getAttribute('ignore_strict_check')) {
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                    $compiler->raw(', true');
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                }
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                $compiler
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                    ->raw(')')
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                ;
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            }
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        }
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    }
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    public function isSpecial()
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    {
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        return isset($this->specialVars[$this->getAttribute('name')]);
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    }
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    public function isSimple()
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    {
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        return !$this->isSpecial() && !$this->getAttribute('is_defined_test');
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    }
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}
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