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<?php
/**
* This file is part of the MathExecutor package
*
* (c) Alexander Kiryukhin
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code
*/
namespace NXP\Classes;
use NXP\Classes\Token\InterfaceToken;
use NXP\Classes\Token\TokenComma;
use NXP\Classes\Token\TokenFunction;
use NXP\Classes\Token\TokenLeftBracket;
use NXP\Classes\Token\TokenNumber;
use NXP\Classes\Token\TokenRightBracket;
use NXP\Classes\Token\TokenVariable;
use NXP\Exception\UnknownFunctionException;
use NXP\Exception\UnknownOperatorException;
use NXP\Exception\UnknownTokenException;
/**
* @author Alexander Kiryukhin <alexander@symdev.org>
*/
class TokenFactory
{
/**
* Available operators
*
* @var array
*/
protected $operators = array();
/**
* Available functions
*
* @var array
*/
protected $functions = array();
/**
* Add function
* @param $name
* @param $function
* @param $places
*/
public function addFunction($name, $function, $places = 1)
{
$this->functions[$name] = array($places, $function);
}
/**
* get functions
*
* @return array containing callback and places indexed by
* function name
*/
public function getFunctions()
{
return $this->functions;
}
/**
* Add operator
* @param string $operatorClass
* @throws \NXP\Exception\UnknownOperatorException
*/
public function addOperator($operatorClass)
{
$class = new \ReflectionClass($operatorClass);
if (!in_array('NXP\Classes\Token\InterfaceToken', $class->getInterfaceNames())) {
throw new UnknownOperatorException;
}
$this->operators[] = $operatorClass;
$this->operators = array_unique($this->operators);
}
/**
* Get registered operators
*
* @return array of operator class names
*/
public function getOperators()
{
return $this->operators;
}
/**
* Add variable
* @param string $name
* @param mixed $value
*/
public function addVariable($name, $value)
{
}
/**
* @return string
*/
public function getTokenParserRegex()
{
$operatorsRegex = '';
foreach ($this->operators as $operator) {
$operatorsRegex .= $operator::getRegex();
}
return sprintf(
'/(%s)|([%s])|(%s)|(%s)|([%s%s%s])/i',
TokenNumber::getRegex(),
$operatorsRegex,
TokenFunction::getRegex(),
TokenVariable::getRegex(),
TokenLeftBracket::getRegex(),
TokenRightBracket::getRegex(),
TokenComma::getRegex()
);
}
/**
* @param string $token
* @return InterfaceToken
* @throws UnknownTokenException
*/
public function createToken($token)
{
if (is_numeric($token)) {
return new TokenNumber($token);
}
if ($token == '(') {
return new TokenLeftBracket();
}
if ($token == ')') {
return new TokenRightBracket();
}
if ($token == ',') {
return new TokenComma();
}
foreach ($this->operators as $operator) {
$regex = sprintf('/%s/i', $operator::getRegex());
if (preg_match($regex, $token)) {
return new $operator;
}
}
$regex = sprintf('/%s/i', TokenVariable::getRegex());
if (preg_match($regex, $token)) {
return new TokenVariable(substr($token,1));
}
$regex = sprintf('/%s/i', TokenFunction::getRegex());
if (preg_match($regex, $token)) {
if (isset($this->functions[$token])) {
return new TokenFunction($this->functions[$token]);
} else {
throw new UnknownFunctionException();
}
}
throw new UnknownTokenException();
}
}
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