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<?php
/** @file regexiterator.inc
* @ingroup SPL
* @brief class RegexIterator
* @author Marcus Boerger
* @date 2003 - 2009
*
* SPL - Standard PHP Library
*/
/**
* @brief Regular expression filter for iterators
* @author Marcus Boerger
* @version 1.0
* @since PHP 5.1
*
* This filter iterator assumes that the inner iterator
*/
class RegexIterator extends FilterIterator
{
const USE_KEY = 0x00000001; /**< If present in $flags the key is
used rather then the current value. */
const MATCH = 0; /**< Mode: Executed a plain match only */
const GET_MATCH = 1; /**< Mode: Return the first matche (if any) */
const ALL_MATCHES = 2; /**< Mode: Return all matches (if any) */
const SPLIT = 3; /**< Mode: Return the split values (if any) */
const REPLACE = 4; /**< Mode: Replace the input key or current */
private $regex; /**< the regular expression to match against */
private $mode; /**< operation mode (one of self::MATCH,
self::GET_MATCH, self::ALL_MATCHES, self::SPLIT) */
private $flags; /**< special flags (self::USE_KEY) */
private $preg_flags;/**< PREG_* flags, see preg_match(), preg_match_all(),
preg_split() */
private $key; /**< the value used for key() */
private $current; /**< the value used for current() */
/**
* Constructs a regular expression filter around an iterator whose
* elemnts or keys are strings.
*
* @param it inner iterator
* @param regex the regular expression to match
* @param mode operation mode (one of self::MATCH, self::GET_MATCH,
* self::ALL_MATCHES, self::SPLIT)
* @param flags special flags (self::USE_KEY)
* @param preg_flags global PREG_* flags, see preg_match(),
* preg_match_all(), preg_split()
*/
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;
}
/**
* Match current or key against regular expression using mode, flags and
* preg_flags.
*
* @return whether this is a match
*
* @warning never call this twice for the same state
*/
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;
}
}
}
/** @return the key after accept has been called
*/
function key()
{
return $this->key;
}
/** @return the current value after accept has been called
*/
function current()
{
return $this->current;
}
/** @return current operation mode
*/
function getMode()
{
return $this->mode;
}
/** @param mode new operaion mode
*/
function setMode($mode)
{
$this->mode = $mode;
}
/** @return current operation flags
*/
function getFlags()
{
return $this->flags;
}
/** @param flags new operaion flags
*/
function setFlags($flags)
{
$this->flags = $flags;
}
/** @return current PREG flags
*/
function getPregFlags()
{
return $this->preg_flags;
}
/** @param preg_flags new PREG flags
*/
function setPregFlags($preg_flags)
{
$this->preg_flags = $preg_flags;
}
/** @return current regular expression
*/
function getRegex()
{
return $this->regex;
}
}
?>