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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\TokenStringSingleQuoted;
use NXP\Classes\Token\TokenVariable;
use NXP\Classes\Token\TokenStringDoubleQuoted;
use NXP\Exception\UnknownFunctionException;
use NXP\Exception\UnknownOperatorException;
use NXP\Exception\UnknownTokenException;
/**
* @author Alexander Kiryukhin <a.kiryukhin@mail.ru>
*/
class TokenFactory
{
/**
* Available operators
*
* @var array
*/
protected $operators = [];
/**
* Divide by zero reporting
*
* @var bool
*/
protected $divideByZeroReporting = false;
/**
* Available functions
*
* @var array
*/
protected $functions = [];
/**
* Add function
* @param string $name
* @param callable $function
* @param int $places
* @throws \ReflectionException
*/
public function addFunction($name, callable $function, $places = null)
{
if ($places === null) {
$reflector = new \ReflectionFunction($function);
$places = $reflector->getNumberOfParameters();
}
$this->functions[$name] = [$places, $function];
}
/**
* get functions
*
* @return array containing callback and places indexed by
* function name
*/
public function getFunctions()
{
return $this->functions;
}
/**
* Add operator
* @param string $operatorClass
* @throws UnknownOperatorException
* @throws \ReflectionException
*/
public function addOperator($operatorClass)
{
$class = new \ReflectionClass($operatorClass);
if (!in_array('NXP\Classes\Token\InterfaceToken', $class->getInterfaceNames())) {
throw new UnknownOperatorException($operatorClass);
}
$this->operators[$operatorClass::getRegex()] = $operatorClass;
}
/**
* Get registered operators
*
* @return array of operator class names
*/
public function getOperators()
{
return $this->operators;
}
/**
* Set division by zero exception reporting
*
* @param bool $exception default true
*
* @return TokenFactory
*/
public function setDivisionByZeroException($exception = true)
{
$this->divideByZeroReporting = $exception;
return $this;
}
/**
* Get division by zero exception status
*
* @return bool
*/
public function getDivisionByZeroException()
{
return $this->divideByZeroReporting;
}
/**
* @return string
*/
public function getTokenParserRegex()
{
$operatorsRegex = '';
foreach ($this->operators as $operator) {
$operatorsRegex .= '|(' . $operator::getRegex() . ')';
}
$s = sprintf(
'/(%s)|(%s)|(%s)|(%s)|(%s)|([%s%s%s])',
TokenNumber::getRegex(),
TokenStringDoubleQuoted::getRegex(),
TokenStringSingleQuoted::getRegex(),
TokenFunction::getRegex(),
TokenVariable::getRegex(),
TokenLeftBracket::getRegex(),
TokenRightBracket::getRegex(),
TokenComma::getRegex()
);
$s .= $operatorsRegex . '/i';
return $s;
}
/**
* @param string $token
* @return InterfaceToken
* @throws UnknownTokenException
* @throws UnknownFunctionException
*/
public function createToken($token)
{
if (is_numeric($token)) {
return new TokenNumber($token);
}
if ($token == '(') {
return new TokenLeftBracket();
}
if ($token == ')') {
return new TokenRightBracket();
}
if ($token[0] == '"') {
return new TokenStringDoubleQuoted(str_replace('"', '', $token));
}
if ($token[0] == "'") {
return new TokenStringSingleQuoted(str_replace("'", '', $token));
}
if ($token == ',') {
return new TokenComma();
}
foreach ($this->operators as $operator) {
$regex = sprintf('/%s/i', $operator::getRegex());
if (preg_match($regex, $token)) {
$op = new $operator;
return $op->setDivisionByZeroException($this->getDivisionByZeroException());
}
}
$regex = sprintf('/%s/i', TokenVariable::getRegex());
if (preg_match($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[$token]);
} else {
throw new UnknownFunctionException($token);
}
}
throw new UnknownTokenException($token);
}
}
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