regexiterator.inc

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<?php

class RegexIterator implements FilterIterator
{
    const USE_KEY     = 0x00000001; 
    const MATCH       = 0; 
    const GET_MATCH   = 1; 
    const ALL_MATCHES = 2; 
    const SPLIT       = 3; 
    const REPLACE     = 4; 
    private $regex;     
    private $mode;      
    private $flags;     
    private $preg_flags;
    private $key;       
    private $current;   
    function __construct(Iterator $it, $regex, $mode = 0, $flags = 0, $preg_flags = 0) {
        parent::__construct($it);
        $this->regex = $regex;
        $this->flags = $flags;
        $this->mode = $mode;
        $this->preg_flags = $preg_flags;
    }

    function accept()
    {
        $matches       = array();
        $this->key     = parent::key();
        $this->current = parent::current();
        /* note that we use $this->current, rather than calling parent::current() */
        $subject = ($this->flags & self::USE_KEY) ? $this->key : $this->current;
        switch($this->mode)
        {
            case self::MATCH:
                return preg_match($this->regex, $subject, $matches, $this->preg_flags);

            case self::GET_MATCH:
                $this->current = array();
                return preg_match($this->regex, $subject, $this->current, $this->preg_flags) > 0;

            case self::ALL_MATCHES:
                $this->current = array();
                return preg_match_all($this->regex, $subject, $this->current, $this->preg_flags) > 0;

            case self::SPLIT:
                $this->current = array();
                preg_split($this->regex, $subject, $this->current, $this->preg_flags) > 1;

            case self::REPLACE:
                $this->current = array();
                $result = preg_replace($this->regex, $this->replacement, $subject);
                if ($this->flags & self::USE_KEY)
                {
                    $this->key = $result;
                }
                else
                {
                    $this->current = $result;
                }
        }
    }

    function key()
    {
        return $this->key;
    }

    function current()
    {
        return $this->current;
    }

    function getMode()
    {
        return $this->mode;
    }

    function setMode($mode)
    {
        $this->mode = $mode;
    }

    function getFlags()
    {
        return $this->flags;
    }

    function setFlags($flags)
    {
        $this->flags = $flags;
    }

    function getPregFlags()
    {
        return $this->preg_flags;
    }

    function setPregFlags($preg_flags)
    {
        $this->preg_flags = $preg_flags;
    }
}

?>

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