recursivetreeiterator.inc

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<?php

class RecursiveTreeIterator extends RecursiveIteratorIterator
{
    const BYPASS_CURRENT = 0x00000004;
    const BYPASS_KEY     = 0x00000008;

    private $rit_flags;

    function __construct(RecursiveIterator $it, $rit_flags = self::BYPASS_KEY, $cit_flags = CachingIterator::CATCH_GET_CHILD, $mode = self::SELF_FIRST)
    {
        parent::__construct(new RecursiveCachingIterator($it, $cit_flags), $mode, $rit_flags);
        $this->rit_flags = $rit_flags;
    }

    private $prefix = array(0=>'', 1=>'| ', 2=>'  ', 3=>'|-', 4=>'\-', 5=>'');

    const PREFIX_LEFT         = 0;
    const PREFIX_MID_HAS_NEXT = 1;
    const PREFIX_MID_LAST     = 2;
    const PREFIX_END_HAS_NEXT = 3;
    const PREFIX_END_LAST     = 4;
    const PREFIX_RIGHT        = 5;

    function setPrefixPart($part, $value)
    {
        if (0 > $part || $part > 5) {
            throw new OutOfRangeException();
        }
        $this->prefix[$part] = (string)$value;
    }

    function getPrefix()
    {
        $tree = '';
        for ($level = 0; $level < $this->getDepth(); $level++)
        {
            $tree .= $this->getSubIterator($level)->hasNext() ? $this->prefix[1] : $this->prefix[2];
        }
        $tree .= $this->getSubIterator($level)->hasNext() ? $this->prefix[3] : $this->prefix[4];

        return $this->prefix[0] . $tree . $this->prefix[5];
    }

    function getEntry()
    {
        return @(string)parent::current();
    }

    function getPostfix()
    {
        return '';
    }

    function current()
    {
        if ($this->rit_flags & self::BYPASS_CURRENT)
        {
            return parent::current();
        }
        else
        {
            return $this->getPrefix() . $this->getEntry() .  $this->getPostfix();
        }
    }

    function key()
    {
        if ($this->rit_flags & self::BYPASS_KEY)
        {
            return parent::key();
        }
        else
        {
            return $this->getPrefix() . parent::key() .  $this->getPostfix();
        }
    }

    function __call($func, $params)
    {
        return call_user_func_array(array($this->getSubIterator(), $func), $params);
    }
}

?>