Create expression precendence level

smnp/ast/node/factor.py

@@ -1,12 +1,30 @@
 from smnp.ast.node.chain import ChainParser
 from smnp.ast.node.operator import BinaryOperator
+from smnp.ast.node.valuable import Valuable
 from smnp.ast.parser import Parser
 from smnp.token.type import TokenType
 
 
-class Factor(BinaryOperator):
+class Factor(Valuable):
     pass
 
 
-FactorParser = Parser.leftAssociativeOperatorParser(ChainParser, [TokenType.DOUBLE_ASTERISK], ChainParser,
-                                                    lambda left, op, right: Factor.withValues(left, op, right))
+powerFactor = Parser.leftAssociativeOperatorParser(ChainParser, [TokenType.DOUBLE_ASTERISK], ChainParser,
+                                                    lambda left, op, right: Factor.withValue(BinaryOperator.withValues(left, op, right)))
+
+
+def exprFactor():
+    from smnp.ast.node.expression import ExpressionParser
+
+    return Parser.allOf(
+        Parser.terminalParser(TokenType.OPEN_PAREN),
+        ExpressionParser,
+        Parser.terminalParser(TokenType.CLOSE_PAREN),
+        createNode=lambda open, expr, close: expr
+    )
+
+def FactorParser(input):
+    return Parser.oneOf(
+        powerFactor,
+        exprFactor()
+    )(input)