eval() is evil

10 files changed, 859 insertions, 0 deletions

diff --git a/vendor/symfony/expression-language/Node/ArgumentsNode.php b/vendor/symfony/expression-language/Node/ArgumentsNode.php
new file mode 100644
index 0000000000..1c78d8054b
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/ArgumentsNode.php
@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class ArgumentsNode extends ArrayNode
+{
+    public function compile(Compiler $compiler)
+    {
+        $this->compileArguments($compiler, false);
+    }
+
+    public function toArray()
+    {
+        $array = array();
+
+        foreach ($this->getKeyValuePairs() as $pair) {
+            $array[] = $pair['value'];
+            $array[] = ', ';
+        }
+        array_pop($array);
+
+        return $array;
+    }
+}
diff --git a/vendor/symfony/expression-language/Node/ArrayNode.php b/vendor/symfony/expression-language/Node/ArrayNode.php
new file mode 100644
index 0000000000..e1a2f2e904
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/ArrayNode.php
@@ -0,0 +1,118 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class ArrayNode extends Node
+{
+    protected $index;
+
+    public function __construct()
+    {
+        $this->index = -1;
+    }
+
+    public function addElement(Node $value, Node $key = null)
+    {
+        if (null === $key) {
+            $key = new ConstantNode(++$this->index);
+        }
+
+        array_push($this->nodes, $key, $value);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     */
+    public function compile(Compiler $compiler)
+    {
+        $compiler->raw('array(');
+        $this->compileArguments($compiler);
+        $compiler->raw(')');
+    }
+
+    public function evaluate($functions, $values)
+    {
+        $result = array();
+        foreach ($this->getKeyValuePairs() as $pair) {
+            $result[$pair['key']->evaluate($functions, $values)] = $pair['value']->evaluate($functions, $values);
+        }
+
+        return $result;
+    }
+
+    public function toArray()
+    {
+        $value = array();
+        foreach ($this->getKeyValuePairs() as $pair) {
+            $value[$pair['key']->attributes['value']] = $pair['value'];
+        }
+
+        $array = array();
+
+        if ($this->isHash($value)) {
+            foreach ($value as $k => $v) {
+                $array[] = ', ';
+                $array[] = new ConstantNode($k);
+                $array[] = ': ';
+                $array[] = $v;
+            }
+            $array[0] = '{';
+            $array[] = '}';
+        } else {
+            foreach ($value as $v) {
+                $array[] = ', ';
+                $array[] = $v;
+            }
+            $array[0] = '[';
+            $array[] = ']';
+        }
+
+        return $array;
+    }
+
+    protected function getKeyValuePairs()
+    {
+        $pairs = array();
+        foreach (array_chunk($this->nodes, 2) as $pair) {
+            $pairs[] = array('key' => $pair[0], 'value' => $pair[1]);
+        }
+
+        return $pairs;
+    }
+
+    protected function compileArguments(Compiler $compiler, $withKeys = true)
+    {
+        $first = true;
+        foreach ($this->getKeyValuePairs() as $pair) {
+            if (!$first) {
+                $compiler->raw(', ');
+            }
+            $first = false;
+
+            if ($withKeys) {
+                $compiler
+                    ->compile($pair['key'])
+                    ->raw(' => ')
+                ;
+            }
+
+            $compiler->compile($pair['value']);
+        }
+    }
+}
diff --git a/vendor/symfony/expression-language/Node/BinaryNode.php b/vendor/symfony/expression-language/Node/BinaryNode.php
new file mode 100644
index 0000000000..33b4c8f089
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/BinaryNode.php
@@ -0,0 +1,162 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class BinaryNode extends Node
+{
+    private static $operators = array(
+        '~' => '.',
+        'and' => '&&',
+        'or' => '||',
+    );
+
+    private static $functions = array(
+        '**' => 'pow',
+        '..' => 'range',
+        'in' => 'in_array',
+        'not in' => '!in_array',
+    );
+
+    public function __construct($operator, Node $left, Node $right)
+    {
+        parent::__construct(
+            array('left' => $left, 'right' => $right),
+            array('operator' => $operator)
+        );
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        $operator = $this->attributes['operator'];
+
+        if ('matches' == $operator) {
+            $compiler
+                ->raw('preg_match(')
+                ->compile($this->nodes['right'])
+                ->raw(', ')
+                ->compile($this->nodes['left'])
+                ->raw(')')
+            ;
+
+            return;
+        }
+
+        if (isset(self::$functions[$operator])) {
+            $compiler
+                ->raw(sprintf('%s(', self::$functions[$operator]))
+                ->compile($this->nodes['left'])
+                ->raw(', ')
+                ->compile($this->nodes['right'])
+                ->raw(')')
+            ;
+
+            return;
+        }
+
+        if (isset(self::$operators[$operator])) {
+            $operator = self::$operators[$operator];
+        }
+
+        $compiler
+            ->raw('(')
+            ->compile($this->nodes['left'])
+            ->raw(' ')
+            ->raw($operator)
+            ->raw(' ')
+            ->compile($this->nodes['right'])
+            ->raw(')')
+        ;
+    }
+
+    public function evaluate($functions, $values)
+    {
+        $operator = $this->attributes['operator'];
+        $left = $this->nodes['left']->evaluate($functions, $values);
+
+        if (isset(self::$functions[$operator])) {
+            $right = $this->nodes['right']->evaluate($functions, $values);
+
+            if ('not in' === $operator) {
+                return !in_array($left, $right);
+            }
+            $f = self::$functions[$operator];
+
+            return $f($left, $right);
+        }
+
+        switch ($operator) {
+            case 'or':
+            case '||':
+                return $left || $this->nodes['right']->evaluate($functions, $values);
+            case 'and':
+            case '&&':
+                return $left && $this->nodes['right']->evaluate($functions, $values);
+        }
+
+        $right = $this->nodes['right']->evaluate($functions, $values);
+
+        switch ($operator) {
+            case '|':
+                return $left | $right;
+            case '^':
+                return $left ^ $right;
+            case '&':
+                return $left & $right;
+            case '==':
+                return $left == $right;
+            case '===':
+                return $left === $right;
+            case '!=':
+                return $left != $right;
+            case '!==':
+                return $left !== $right;
+            case '<':
+                return $left < $right;
+            case '>':
+                return $left > $right;
+            case '>=':
+                return $left >= $right;
+            case '<=':
+                return $left <= $right;
+            case 'not in':
+                return !in_array($left, $right);
+            case 'in':
+                return in_array($left, $right);
+            case '+':
+                return $left + $right;
+            case '-':
+                return $left - $right;
+            case '~':
+                return $left.$right;
+            case '*':
+                return $left * $right;
+            case '/':
+                return $left / $right;
+            case '%':
+                return $left % $right;
+            case 'matches':
+                return preg_match($right, $left);
+        }
+    }
+
+    public function toArray()
+    {
+        return array('(', $this->nodes['left'], ' '.$this->attributes['operator'].' ', $this->nodes['right'], ')');
+    }
+}
diff --git a/vendor/symfony/expression-language/Node/ConditionalNode.php b/vendor/symfony/expression-language/Node/ConditionalNode.php
new file mode 100644
index 0000000000..9db0f931aa
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/ConditionalNode.php
@@ -0,0 +1,56 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class ConditionalNode extends Node
+{
+    public function __construct(Node $expr1, Node $expr2, Node $expr3)
+    {
+        parent::__construct(
+            array('expr1' => $expr1, 'expr2' => $expr2, 'expr3' => $expr3)
+        );
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        $compiler
+            ->raw('((')
+            ->compile($this->nodes['expr1'])
+            ->raw(') ? (')
+            ->compile($this->nodes['expr2'])
+            ->raw(') : (')
+            ->compile($this->nodes['expr3'])
+            ->raw('))')
+        ;
+    }
+
+    public function evaluate($functions, $values)
+    {
+        if ($this->nodes['expr1']->evaluate($functions, $values)) {
+            return $this->nodes['expr2']->evaluate($functions, $values);
+        }
+
+        return $this->nodes['expr3']->evaluate($functions, $values);
+    }
+
+    public function toArray()
+    {
+        return array('(', $this->nodes['expr1'], ' ? ', $this->nodes['expr2'], ' : ', $this->nodes['expr3'], ')');
+    }
+}
diff --git a/vendor/symfony/expression-language/Node/ConstantNode.php b/vendor/symfony/expression-language/Node/ConstantNode.php
new file mode 100644
index 0000000000..733d481b28
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/ConstantNode.php
@@ -0,0 +1,81 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class ConstantNode extends Node
+{
+    private $isIdentifier;
+
+    public function __construct($value, $isIdentifier = false)
+    {
+        $this->isIdentifier = $isIdentifier;
+        parent::__construct(
+            array(),
+            array('value' => $value)
+        );
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        $compiler->repr($this->attributes['value']);
+    }
+
+    public function evaluate($functions, $values)
+    {
+        return $this->attributes['value'];
+    }
+
+    public function toArray()
+    {
+        $array = array();
+        $value = $this->attributes['value'];
+
+        if ($this->isIdentifier) {
+            $array[] = $value;
+        } elseif (true === $value) {
+            $array[] = 'true';
+        } elseif (false === $value) {
+            $array[] = 'false';
+        } elseif (null === $value) {
+            $array[] = 'null';
+        } elseif (is_numeric($value)) {
+            $array[] = $value;
+        } elseif (!is_array($value)) {
+            $array[] = $this->dumpString($value);
+        } elseif ($this->isHash($value)) {
+            foreach ($value as $k => $v) {
+                $array[] = ', ';
+                $array[] = new self($k);
+                $array[] = ': ';
+                $array[] = new self($v);
+            }
+            $array[0] = '{';
+            $array[] = '}';
+        } else {
+            foreach ($value as $v) {
+                $array[] = ', ';
+                $array[] = new self($v);
+            }
+            $array[0] = '[';
+            $array[] = ']';
+        }
+
+        return $array;
+    }
+}
diff --git a/vendor/symfony/expression-language/Node/FunctionNode.php b/vendor/symfony/expression-language/Node/FunctionNode.php
new file mode 100644
index 0000000000..13928c8d4f
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/FunctionNode.php
@@ -0,0 +1,67 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class FunctionNode extends Node
+{
+    public function __construct($name, Node $arguments)
+    {
+        parent::__construct(
+            array('arguments' => $arguments),
+            array('name' => $name)
+        );
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        $arguments = array();
+        foreach ($this->nodes['arguments']->nodes as $node) {
+            $arguments[] = $compiler->subcompile($node);
+        }
+
+        $function = $compiler->getFunction($this->attributes['name']);
+
+        $compiler->raw(call_user_func_array($function['compiler'], $arguments));
+    }
+
+    public function evaluate($functions, $values)
+    {
+        $arguments = array($values);
+        foreach ($this->nodes['arguments']->nodes as $node) {
+            $arguments[] = $node->evaluate($functions, $values);
+        }
+
+        return call_user_func_array($functions[$this->attributes['name']]['evaluator'], $arguments);
+    }
+
+    public function toArray()
+    {
+        $array = array();
+        $array[] = $this->attributes['name'];
+
+        foreach ($this->nodes['arguments']->nodes as $node) {
+            $array[] = ', ';
+            $array[] = $node;
+        }
+        $array[1] = '(';
+        $array[] = ')';
+
+        return $array;
+    }
+}
diff --git a/vendor/symfony/expression-language/Node/GetAttrNode.php b/vendor/symfony/expression-language/Node/GetAttrNode.php
new file mode 100644
index 0000000000..2ecba97f7f
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/GetAttrNode.php
@@ -0,0 +1,114 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class GetAttrNode extends Node
+{
+    const PROPERTY_CALL = 1;
+    const METHOD_CALL = 2;
+    const ARRAY_CALL = 3;
+
+    public function __construct(Node $node, Node $attribute, ArrayNode $arguments, $type)
+    {
+        parent::__construct(
+            array('node' => $node, 'attribute' => $attribute, 'arguments' => $arguments),
+            array('type' => $type)
+        );
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        switch ($this->attributes['type']) {
+            case self::PROPERTY_CALL:
+                $compiler
+                    ->compile($this->nodes['node'])
+                    ->raw('->')
+                    ->raw($this->nodes['attribute']->attributes['value'])
+                ;
+                break;
+
+            case self::METHOD_CALL:
+                $compiler
+                    ->compile($this->nodes['node'])
+                    ->raw('->')
+                    ->raw($this->nodes['attribute']->attributes['value'])
+                    ->raw('(')
+                    ->compile($this->nodes['arguments'])
+                    ->raw(')')
+                ;
+                break;
+
+            case self::ARRAY_CALL:
+                $compiler
+                    ->compile($this->nodes['node'])
+                    ->raw('[')
+                    ->compile($this->nodes['attribute'])->raw(']')
+                ;
+                break;
+        }
+    }
+
+    public function evaluate($functions, $values)
+    {
+        switch ($this->attributes['type']) {
+            case self::PROPERTY_CALL:
+                $obj = $this->nodes['node']->evaluate($functions, $values);
+                if (!is_object($obj)) {
+                    throw new \RuntimeException('Unable to get a property on a non-object.');
+                }
+
+                $property = $this->nodes['attribute']->attributes['value'];
+
+                return $obj->$property;
+
+            case self::METHOD_CALL:
+                $obj = $this->nodes['node']->evaluate($functions, $values);
+                if (!is_object($obj)) {
+                    throw new \RuntimeException('Unable to get a property on a non-object.');
+                }
+                if (!is_callable($toCall = array($obj, $this->nodes['attribute']->attributes['value']))) {
+                    throw new \RuntimeException(sprintf('Unable to call method "%s" of object "%s".', $this->nodes['attribute']->attributes['value'], get_class($obj)));
+                }
+
+                return call_user_func_array($toCall, $this->nodes['arguments']->evaluate($functions, $values));
+
+            case self::ARRAY_CALL:
+                $array = $this->nodes['node']->evaluate($functions, $values);
+                if (!is_array($array) && !$array instanceof \ArrayAccess) {
+                    throw new \RuntimeException('Unable to get an item on a non-array.');
+                }
+
+                return $array[$this->nodes['attribute']->evaluate($functions, $values)];
+        }
+    }
+
+    public function toArray()
+    {
+        switch ($this->attributes['type']) {
+            case self::PROPERTY_CALL:
+                return array($this->nodes['node'], '.', $this->nodes['attribute']);
+
+            case self::METHOD_CALL:
+                return array($this->nodes['node'], '.', $this->nodes['attribute'], '(', $this->nodes['arguments'], ')');
+
+            case self::ARRAY_CALL:
+                return array($this->nodes['node'], '[', $this->nodes['attribute'], ']');
+        }
+    }
+}
diff --git a/vendor/symfony/expression-language/Node/NameNode.php b/vendor/symfony/expression-language/Node/NameNode.php
new file mode 100644
index 0000000000..9e1462f2c6
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/NameNode.php
@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class NameNode extends Node
+{
+    public function __construct($name)
+    {
+        parent::__construct(
+            array(),
+            array('name' => $name)
+        );
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        $compiler->raw('$'.$this->attributes['name']);
+    }
+
+    public function evaluate($functions, $values)
+    {
+        return $values[$this->attributes['name']];
+    }
+
+    public function toArray()
+    {
+        return array($this->attributes['name']);
+    }
+}
diff --git a/vendor/symfony/expression-language/Node/Node.php b/vendor/symfony/expression-language/Node/Node.php
new file mode 100644
index 0000000000..1db4e85280
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/Node.php
@@ -0,0 +1,110 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * Represents a node in the AST.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Node
+{
+    public $nodes = array();
+    public $attributes = array();
+
+    /**
+     * @param array $nodes      An array of nodes
+     * @param array $attributes An array of attributes
+     */
+    public function __construct(array $nodes = array(), array $attributes = array())
+    {
+        $this->nodes = $nodes;
+        $this->attributes = $attributes;
+    }
+
+    public function __toString()
+    {
+        $attributes = array();
+        foreach ($this->attributes as $name => $value) {
+            $attributes[] = sprintf('%s: %s', $name, str_replace("\n", '', var_export($value, true)));
+        }
+
+        $repr = array(str_replace('Symfony\Component\ExpressionLanguage\Node\\', '', get_class($this)).'('.implode(', ', $attributes));
+
+        if (count($this->nodes)) {
+            foreach ($this->nodes as $node) {
+                foreach (explode("\n", (string) $node) as $line) {
+                    $repr[] = '    '.$line;
+                }
+            }
+
+            $repr[] = ')';
+        } else {
+            $repr[0] .= ')';
+        }
+
+        return implode("\n", $repr);
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        foreach ($this->nodes as $node) {
+            $node->compile($compiler);
+        }
+    }
+
+    public function evaluate($functions, $values)
+    {
+        $results = array();
+        foreach ($this->nodes as $node) {
+            $results[] = $node->evaluate($functions, $values);
+        }
+
+        return $results;
+    }
+
+    public function toArray()
+    {
+        throw new \BadMethodCallException(sprintf('Dumping a "%s" instance is not supported yet.', get_class($this)));
+    }
+
+    public function dump()
+    {
+        $dump = '';
+
+        foreach ($this->toArray() as $v) {
+            $dump .= is_scalar($v) ? $v : $v->dump();
+        }
+
+        return $dump;
+    }
+
+    protected function dumpString($value)
+    {
+        return sprintf('"%s"', addcslashes($value, "\0\t\"\\"));
+    }
+
+    protected function isHash(array $value)
+    {
+        $expectedKey = 0;
+
+        foreach ($value as $key => $val) {
+            if ($key !== $expectedKey++) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
diff --git a/vendor/symfony/expression-language/Node/UnaryNode.php b/vendor/symfony/expression-language/Node/UnaryNode.php
new file mode 100644
index 0000000000..583103217a
--- /dev/null
+++ b/vendor/symfony/expression-language/Node/UnaryNode.php
@@ -0,0 +1,66 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class UnaryNode extends Node
+{
+    private static $operators = array(
+        '!' => '!',
+        'not' => '!',
+        '+' => '+',
+        '-' => '-',
+    );
+
+    public function __construct($operator, Node $node)
+    {
+        parent::__construct(
+            array('node' => $node),
+            array('operator' => $operator)
+        );
+    }
+
+    public function compile(Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->raw(self::$operators[$this->attributes['operator']])
+            ->compile($this->nodes['node'])
+            ->raw(')')
+        ;
+    }
+
+    public function evaluate($functions, $values)
+    {
+        $value = $this->nodes['node']->evaluate($functions, $values);
+        switch ($this->attributes['operator']) {
+            case 'not':
+            case '!':
+                return !$value;
+            case '-':
+                return -$value;
+        }
+
+        return $value;
+    }
+
+    public function toArray()
+    {
+        return array('(', $this->attributes['operator'].' ', $this->nodes['node'], ')');
+    }
+}