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  1. <?php
  2. 	// Staring straight up into the sky ... oh my my
  3. 	error_reporting(-1);
  4. 	mb_internal_encoding('utf-8');
  5.  
  6. 	define( 'UNDEFTOK', '0' );
  7. 	define( 'NUMBERTOK', '1' );
  8. 	define( 'OPERATORTOK', '2' );
  9. 	define( 'ENDPARSE', '3' );
  10.  
  11. 	class Calculator{
  12. 		private $token_type = 0;
  13. 		private $token = "";
  14. 		private $exp_ptr = 0;
  15.  
  16. 		public $parse_string = "";
  17.  
  18. 		function __construct($str){
  19. 			$this->parse_string = preg_replace("/\s+/", "", $str);
  20. 			$this->exp_ptr = 0;
  21.  
  22. 			$this->tok_type = ENDPARSE;
  23. 			$this->token = "";
  24. 		}
  25.  
  26. 		private function isoperator($tok){
  27. 			return preg_match_all("/[\+\-\*\/\^\=\(\)%]/u", $tok, $temp);
  28. 		}
  29.  
  30. 		private function isdigit($tok){
  31. 			return preg_match_all("/[\d\.]/u", $tok, $temp);
  32. 		}
  33.  
  34. 		public function get_token(){
  35. 			$tok = "";
  36. 			$this->token_type = UNDEFTOK;
  37. 			$this->token = "";
  38. 			if($this->parse_string == ""){
  39. 				$this->token_type = UNDEFTOK;
  40. 				$this->token = "";
  41. 				return;
  42. 			}
  43. 			if($this->exp_ptr == strlen($this->parse_string)){
  44. 				$this->token_type = ENDPARSE;
  45. 				$this->token = "";
  46. 				return;
  47. 			}
  48. 			$tok = substr($this->parse_string, $this->exp_ptr, 1);
  49. 			if($this->isoperator($tok)){
  50. 				$this->token_type = OPERATORTOK;
  51. 				$this->token = $tok;
  52. 				$this->exp_ptr++;
  53. 			}elseif($this->isdigit($tok)){
  54. 				$this->token_type = NUMBERTOK;
  55. 				while($this->isdigit($tok)){
  56. 					$this->token = $this->token.$tok;
  57. 					$this->exp_ptr++;
  58. 					$tok = substr($this->parse_string, $this->exp_ptr, 1);
  59. 				}
  60. 			}else{
  61. 				return;
  62. 			}
  63. 		}
  64.  
  65. 		public function compute(){
  66. 			$result = 0.0;
  67. 			$this->get_token();
  68. 			if($this->token == ""){
  69. 				echo "Выражение отсутствует";
  70. 				return 0.0;
  71. 			}
  72. 			$this->addOrSubtractMembers($result);
  73. 			return $result;
  74. 		}
  75.  
  76. 		// Сложить или вычесть два члена
  77. 		public function addOrSubtractMembers(&$result){
  78. 			$op = "";
  79. 			$temp = 0.0;
  80.  
  81. 			$this->multiplyOrDivide($result);
  82. 			$op = $this->token;
  83.  
  84. 			While ($op == "+" || $op == "-") {
  85. 				$this->get_token();
  86. 				$this->multiplyOrDivide($temp);
  87. 				switch ($op) {
  88. 					case "-":
  89. 						$result = $result - $temp;
  90. 						break;
  91. 					case "+":
  92. 						$result = $result + $temp;
  93. 						break;
  94. 				}
  95. 				$op = $this->token;
  96. 			}
  97. 		}
  98.  
  99. 		// Перемножить или поделить
  100. 		public function multiplyOrDivide(&$result){
  101. 			$op = "";
  102. 			$temp = 0.0;
  103.  
  104. 			$this->processingDegree($result);
  105. 			$op = $this->token;
  106. 			While ($op == "*" || $op == "/" || $op == "%") {
  107. 				$this->get_token();
  108. 				$this->processingDegree($temp);
  109. 				switch ($op) {
  110. 					case "*":
  111. 						$result = $result * $temp;
  112. 						break;
  113. 					case "/":
  114. 						if($temp == 0){
  115. 							echo "Делим на ноль";
  116. 							exit(-1);
  117. 						}
  118. 						$result = $result / $temp;
  119. 						break;
  120. 					case "%":
  121. 						$result = $result % $temp;
  122. 						break;
  123. 				}
  124. 				$op = $this->token;
  125. 			}
  126. 			return;
  127. 		}
  128.  
  129. 		// обработка степени
  130. 		public function processingDegree(&$result){
  131. 			$op = "";
  132. 			$temp = 0.0;
  133. 			$ex = 0.0;
  134.  
  135. 			$this->unaryOperation($result);
  136. 			if($this->token == "^"){
  137. 				$this->get_token();
  138. 				$this->processingDegree($temp);
  139. 				$ex = $result;
  140. 				if($temp == 0){
  141. 					$result = 0.0;
  142. 					return;
  143. 				}
  144. 				$result = pow($result, $temp);
  145. 			}
  146. 			return;
  147. 		}
  148.  
  149. 		// Унарный + или -
  150. 		public function unaryOperation(&$result){
  151. 			$op = "";
  152. 			if($this->token_type == OPERATORTOK && $this->token == "+" || $this->token == "-" ){
  153. 				$op = $this->token;
  154. 				$this->get_token();
  155. 			}
  156. 			$this->processingBrackets($result);
  157. 			if($op == "-"){
  158. 				$result = -1 * $result;
  159. 			}
  160. 			return;
  161. 		}
  162.  
  163. 		// Выражения в скобках
  164. 		public function processingBrackets(&$result){
  165. 			if($this->token == "("){
  166. 				$this->get_token();
  167. 				$this->addOrSubtractMembers($result);
  168. 				if($this->token != ")"){
  169. 					exit("Не хватает скобок");
  170. 				}
  171. 				$this->get_token();
  172. 			} else {
  173. 				$this->receiveValueNumber($result);
  174. 			}
  175. 		}
  176.  
  177. 		// Получить значение числа
  178. 		public function receiveValueNumber(&$result){
  179. 			switch ($this->token_type) {
  180. 				case NUMBERTOK:
  181. 					$result = (double)$this->token;
  182. 					$this->get_token();
  183. 					return;
  184. 				default:
  185. 					exit("Что-то пошло не так receiveValueNumber()\t\$this->token = {$this->token}\t\$this->token_type = {$this->token_type}");
  186. 			}
  187. 		}
  188. 	}
  189.  
  190. 	function test(&$tst){
  191. 		$tst++;
  192. 	}
  193.  
  194. 	$test = new Calculator("6+5/8+15*9/8*9/8*(55+6*5)");
  195. 	echo "{$test->parse_string} = ".$test->compute()."\n";
  196.  
  197. 	$test2 = new Calculator("6 + 5^2*8 + 6 / 89*8 - 9+3");
  198. 	echo "{$test2->parse_string} = ".$test2->compute()."\n";
  199.  
  200. 	$test3 = new Calculator("6.6 + 5.2^5.5555+6/8*9.9^55.66");
  201. 	echo "{$test3->parse_string} = ".$test3->compute()."\n";
  202.  
  203. 	$test4 = new Calculator("6.6 * (2+(6+(9/8)*6/(5+9)))");
  204. 	echo "{$test4->parse_string} = ".$test4->compute()."\n";
  205.  
  206. ?>
Success #stdin #stdout 0.02s 52432KB
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6+5/8+15*9/8*9/8*(55+6*5) = 1620.296875
6+5^2*8+6/89*8-9+3 = 200.5393258427
6.6+5.2^5.5555+6/8*9.9^55.66 = 1.9593688289175E+55
6.6*(2+(6+(9/8)*6/(5+9))) = 55.982142857143
https://ideone.com/ERuDLR
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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