<?php

/*
 * This file is part of Twig.
 *
 * (c) 2009 Fabien Potencier
 * (c) 2009 Armin Ronacher
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Represents a node in the AST.
 *
 * @package    twig
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 */
class Twig_Node implements Twig_NodeInterface, Countable, IteratorAggregate
{
    protected $nodes;
    protected $attributes;
    protected $lineno;
    protected $tag;

    /**
     * Constructor.
     *
     * The nodes are automatically made available as properties ($this->node).
     * The attributes are automatically made available as array items ($this['name']).
     *
     * @param array   $nodes      An array of named nodes
     * @param array   $attributes An array of attributes (should not be nodes)
     * @param integer $lineno     The line number
     * @param string  $tag        The tag name associated with the Node
     */
    public function __construct(array $nodes = array(), array $attributes = array(), $lineno = 0, $tag = null)
    {
        $this->nodes = $nodes;
        $this->attributes = $attributes;
        $this->lineno = $lineno;
        $this->tag = $tag;
    }

    public function __toString()
    {
        $attributes = array();
        foreach ($this->attributes as $name => $value) {
            $attributes[] = sprintf('%s: %s', $name, str_replace("\n", '', var_export($value, true)));
        }

        $repr = array(get_class($this).'('.implode(', ', $attributes));

        if (count($this->nodes)) {
            foreach ($this->nodes as $name => $node) {
                $len = strlen($name) + 4;
                $noderepr = array();
                foreach (explode("\n", (string) $node) as $line) {
                    $noderepr[] = str_repeat(' ', $len).$line;
                }

                $repr[] = sprintf('  %s: %s', $name, ltrim(implode("\n", $noderepr)));
            }

            $repr[] = ')';
        } else {
            $repr[0] .= ')';
        }

        return implode("\n", $repr);
    }

    public function toXml($asDom = false)
    {
        $dom = new DOMDocument('1.0', 'UTF-8');
        $dom->formatOutput = true;
        $dom->appendChild($xml = $dom->createElement('twig'));

        $xml->appendChild($node = $dom->createElement('node'));
        $node->setAttribute('class', get_class($this));

        foreach ($this->attributes as $name => $value) {
            $node->appendChild($attribute = $dom->createElement('attribute'));
            $attribute->setAttribute('name', $name);
            $attribute->appendChild($dom->createTextNode($value));
        }

        foreach ($this->nodes as $name => $n) {
            if (null === $n) {
                continue;
            }

            $child = $n->toXml(true)->getElementsByTagName('node')->item(0);
            $child = $dom->importNode($child, true);
            $child->setAttribute('name', $name);

            $node->appendChild($child);
        }

        return $asDom ? $dom : $dom->saveXml();
    }

    public function compile($compiler)
    {
        foreach ($this->nodes as $node) {
            $node->compile($compiler);
        }
    }

    public function getLine()
    {
        return $this->lineno;
    }

    public function getNodeTag()
    {
        return $this->tag;
    }

    /**
     * Returns true if the attribute is defined.
     *
     * @param  string  The attribute name
     *
     * @return Boolean true if the attribute is defined, false otherwise
     */
    public function hasAttribute($name)
    {
        return array_key_exists($name, $this->attributes);
    }

    /**
     * Gets an attribute.
     *
     * @param  string The attribute name
     *
     * @return mixed  The attribute value
     */
    public function getAttribute($name)
    {
        if (!array_key_exists($name, $this->attributes)) {
            throw new Twig_Error_Runtime(sprintf('Attribute "%s" does not exist for Node "%s".', $name, get_class($this)));
        }

        return $this->attributes[$name];
    }

    /**
     * Sets an attribute.
     *
     * @param string The attribute name
     * @param mixed  The attribute value
     */
    public function setAttribute($name, $value)
    {
        $this->attributes[$name] = $value;
    }

    /**
     * Removes an attribute.
     *
     * @param string The attribute name
     */
    public function removeAttribute($name)
    {
        unset($this->attributes[$name]);
    }

    /**
     * Returns true if the node with the given identifier exists.
     *
     * @param  string  The node name
     *
     * @return Boolean true if the node with the given name exists, false otherwise
     */
    public function hasNode($name)
    {
        return array_key_exists($name, $this->nodes);
    }

    /**
     * Gets a node by name.
     *
     * @param  string The node name
     *
     * @return Twig_Node A Twig_Node instance
     */
    public function getNode($name)
    {
        if (!array_key_exists($name, $this->nodes)) {
            throw new Twig_Error_Runtime(sprintf('Node "%s" does not exist for Node "%s".', $name, get_class($this)));
        }

        return $this->nodes[$name];
    }

    /**
     * Sets a node.
     *
     * @param string    The node name
     * @param Twig_Node A Twig_Node instance
     */
    public function setNode($name, $node = null)
    {
        $this->nodes[$name] = $node;
    }

    /**
     * Removes a node by name.
     *
     * @param string The node name
     */
    public function removeNode($name)
    {
        unset($this->nodes[$name]);
    }

    public function count()
    {
        return count($this->nodes);
    }

    public function getIterator()
    {
        return new ArrayIterator($this->nodes);
    }
}
