Create tools/math_tool.py

tools/tools/math_tool.py

@@ -0,0 +1,46 @@
+import re
+import ast
+import operator
+
+def safe_eval(expression: str) -> float:
+    """Säkert evaluera matematiska uttryck"""
+    # Tillåtna operatorer
+    operators = {
+        ast.Add: operator.add,
+        ast.Sub: operator.sub,
+        ast.Mult: operator.mul,
+        ast.Div: operator.truediv,
+        ast.Pow: operator.pow,
+        ast.BitXor: operator.xor,
+        ast.USub: operator.neg,
+    }
+    
+    def eval_expr(node):
+        if isinstance(node, ast.Num):
+            return node.n
+        elif isinstance(node, ast.BinOp):
+            return operators[type(node.op)](eval_expr(node.left), eval_expr(node.right))
+        elif isinstance(node, ast.UnaryOp):
+            return operators[type(node.op)](eval_expr(node.operand))
+        else:
+            raise TypeError(node)
+    
+    try:
+        return eval_expr(ast.parse(expression, mode='eval').body)
+    except:
+        return None
+
+def calculate_math(expression: str) -> str:
+    """Beräkna matematiska uttryck"""
+    try:
+        # Rensa uttrycket
+        clean_expr = re.sub(r'[^0-9+\-*/().\s]', '', expression)
+        
+        result = safe_eval(clean_expr)
+        if result is not None:
+            return str(result)
+        else:
+            return f"Cannot calculate: {expression}"
+    
+    except Exception as e:
+        return f"Math error: {str(e)}"