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<?php
namespace Kanboard\Core\Filter;
/**
* Lexer
*
* @package filter
* @author Frederic Guillot
*/
class Lexer
{
/**
* Current position
*
* @access private
* @var integer
*/
private $offset = 0;
/**
* Token map
*
* @access private
* @var array
*/
private $tokenMap = array(
'/^(\s+)/' => 'T_WHITESPACE',
'/^([<=>]{0,2}[0-9]{4}-[0-9]{2}-[0-9]{2})/' => 'T_STRING',
'/^([<=>]{1,2}\w+)/u' => 'T_STRING',
'/^([<=>]{1,2}".+")/' => 'T_STRING',
'/^("(.*?)")/' => 'T_STRING',
'/^(\S+)/u' => 'T_STRING',
'/^(#\d+)/' => 'T_STRING',
);
/**
* Default token
*
* @access private
* @var string
*/
private $defaultToken = '';
/**
* Add token
*
* @access public
* @param string $regex
* @param string $token
* @return $this
*/
public function addToken($regex, $token)
{
$this->tokenMap = array($regex => $token) + $this->tokenMap;
return $this;
}
/**
* Set default token
*
* @access public
* @param string $token
* @return $this
*/
public function setDefaultToken($token)
{
$this->defaultToken = $token;
return $this;
}
/**
* Tokenize input string
*
* @access public
* @param string $input
* @return array
*/
public function tokenize($input)
{
$tokens = array();
$this->offset = 0;
$input_length = mb_strlen($input, 'UTF-8');
while ($this->offset < $input_length) {
$result = $this->match(mb_substr($input, $this->offset, $input_length, 'UTF-8'));
if ($result === false) {
return array();
}
$tokens[] = $result;
}
return $this->map($tokens);
}
/**
* Find a token that match and move the offset
*
* @access protected
* @param string $string
* @return array|boolean
*/
protected function match($string)
{
foreach ($this->tokenMap as $pattern => $name) {
if (preg_match($pattern, $string, $matches)) {
$this->offset += mb_strlen($matches[1], 'UTF-8');
return array(
'match' => str_replace('"', '', $matches[1]),
'token' => $name,
);
}
}
return false;
}
/**
* Build map of tokens and matches
*
* @access protected
* @param array $tokens
* @return array
*/
protected function map(array $tokens)
{
$map = array();
$leftOver = '';
while (false !== ($token = current($tokens))) {
if ($token['token'] === 'T_STRING' || $token['token'] === 'T_WHITESPACE') {
$leftOver .= $token['match'];
} else {
$next = next($tokens);
if ($next !== false && $next['token'] === 'T_STRING') {
$map[$token['token']][] = $next['match'];
}
}
next($tokens);
}
$leftOver = trim($leftOver);
if ($this->defaultToken !== '' && $leftOver !== '') {
$map[$this->defaultToken] = array($leftOver);
}
return $map;
}
}
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