closes #17, великое переименование классов для автозагрузчика, актуализация кода

2022-08-25 14:23:36 +03:00
parent 6cd7b13db0
commit 42714daeda
203 changed files with 38783 additions and 39766 deletions
@@ -0,0 +1,63 @@
+<?php
+/** Ïîëó÷àåì íà âõîä ñòðîêó, à íà âûõîä ðåçóëüòàò ìàòåìàòè÷åñêîé îïåðàöèè â ñòðîêå. */
+class CalculateFromString
+{
+    const PATTERN = '/(?:\-?\d+(?:\.?\d+)?[\+\-\*\/])+\-?\d+(?:\.?\d+)?/';
+    const PARENTHESIS_DEPTH = 10;
+
+    public function calculate($input){
+        if(strpos($input, '+') != null || strpos($input, '-') != null || strpos($input, '/') != null || strpos($input, '*') != null){
+            //  Remove white spaces and invalid math chars
+            $input = str_replace(',', '.', $input);
+            $input = str_replace(' ', '', $input);
+            $input = preg_replace('[^0-9\.\+\-\*\/\(\)]', '', $input);
+
+            //  Calculate each of the parenthesis from the top
+            $i = 0;
+            while(strpos($input, '(') || strpos($input, ')')){
+                $input = preg_replace_callback('/\(([^\(\)]+)\)/', 'self::callback', $input);
+
+                $i++;
+                if($i > self::PARENTHESIS_DEPTH){
+                    break;
+                }
+            }
+
+            //  Calculate the result
+            if(preg_match(self::PATTERN, $input, $match)){
+                return $this->compute($match[0]);
+            }
+            // To handle the special case of expressions surrounded by global parenthesis like "(1+1)"
+            if(is_numeric($input)){
+                return $input;
+            }
+
+            return 0;
+        }
+
+        return $input;
+    }
+
+    private function compute($input){
+        $compute = create_function('', 'return '.$input.';');
+
+        return 0 + $compute();
+    }
+
+    private function callback($input){
+        if(is_numeric($input[1])){
+            return $input[1];
+        }
+        elseif(preg_match(self::PATTERN, $input[1], $match)){
+            return $this->compute($match[0]);
+        }
+
+        return 0;
+    }
+}
+
+$Cal = new CalculateFromString();
+$xyz='(100 * 25000) + (250 * 25000) + ((500/100) * 25000)';
+$result = $Cal->calculate($xyz);
+echo $result;
+