move nested logic into functions

slither/utils/expression_manipulations.py

@@ -23,7 +23,8 @@ from slither.all_exceptions import SlitherException
 
 # pylint: disable=protected-access
 def f_expressions(
-    e: AssignmentOperation, x: Union[Identifier, Literal, MemberAccess, IndexAccess]
+    e: Union[AssignmentOperation, BinaryOperation, TupleExpression],
+    x: Union[Identifier, Literal, MemberAccess, IndexAccess],
 ) -> None:
     e._expressions.append(x)
 
@@ -40,7 +41,7 @@ def f_call_gas(e: CallExpression, x):
     e._gas = x
 
 
-def f_expression(e, x):
+def f_expression(e: Union[TypeConversion, UnaryOperation, MemberAccess], x):
     e._expression = x
 
 
@@ -86,7 +87,6 @@ class SplitTernaryExpression:
         f(false_expression, copy.copy(next_expr))
         return True
 
-    # pylint: disable=too-many-branches
     def copy_expression(
         self, expression: Expression, true_expression: Expression, false_expression: Expression
     ) -> None:
@@ -102,35 +102,42 @@ class SplitTernaryExpression:
         ):
             return
 
-        # case of lib
-        # (.. ? .. : ..).add
-        if isinstance(expression, MemberAccess):
+        elif isinstance(expression, (AssignmentOperation, BinaryOperation, TupleExpression)):
+            true_expression._expressions = []
+            false_expression._expressions = []
+            self.convert_expressions(expression, true_expression, false_expression)
+
+        elif isinstance(expression, CallExpression):
+            next_expr = expression.called
+            self.convert_call_expression(expression, next_expr, true_expression, false_expression)
+
+        elif isinstance(expression, (TypeConversion, UnaryOperation, MemberAccess)):
             next_expr = expression.expression
             if self.conditional_not_ahead(
                 next_expr, true_expression, false_expression, f_expression
             ):
                 self.copy_expression(
-                    next_expr, true_expression.expression, false_expression.expression
+                    expression.expression,
+                    true_expression.expression,
+                    false_expression.expression,
                 )
-        # pylint: disable=too-many-nested-blocks
-        elif isinstance(expression, (AssignmentOperation, BinaryOperation, TupleExpression)):
-            true_expression._expressions = []
-            false_expression._expressions = []
+
+        else:
+            raise SlitherException(
+                f"Ternary operation not handled {expression}({type(expression)})"
+            )
+
+    def convert_expressions(
+        self,
+        expression: Union[AssignmentOperation, BinaryOperation, TupleExpression],
+        true_expression: Expression,
+        false_expression: Expression,
+    ) -> None:
         for next_expr in expression.expressions:
             # TODO: can we get rid of `NoneType` expressions in `TupleExpression`?
             if next_expr:
                 if isinstance(next_expr, IndexAccess):
-                        # create an index access for each branch
-                        #  x[if cond ? 1 : 2] -> if cond { x[1] } else { x[2] }
-                        for expr in next_expr.expressions:
-                            if self.conditional_not_ahead(
-                                expr, true_expression, false_expression, f_expressions
-                            ):
-                                self.copy_expression(
-                                    expr,
-                                    true_expression.expressions[-1],
-                                    false_expression.expressions[-1],
-                                )
+                    self.convert_index_access(next_expr, true_expression, false_expression)
 
                 if self.conditional_not_ahead(
                     next_expr, true_expression, false_expression, f_expressions
@@ -142,9 +149,26 @@ class SplitTernaryExpression:
                         false_expression.expressions[-1],
                     )
 
-        elif isinstance(expression, CallExpression):
-            next_expr = expression.called
+    def convert_index_access(
+        self, next_expr: IndexAccess, true_expression: Expression, false_expression: Expression
+    ) -> None:
+        # create an index access for each branch
+        #  x[if cond ? 1 : 2] -> if cond { x[1] } else { x[2] }
+        for expr in next_expr.expressions:
+            if self.conditional_not_ahead(expr, true_expression, false_expression, f_expressions):
+                self.copy_expression(
+                    expr,
+                    true_expression.expressions[-1],
+                    false_expression.expressions[-1],
+                )
 
+    def convert_call_expression(
+        self,
+        expression: CallExpression,
+        next_expr: Expression,
+        true_expression: Expression,
+        false_expression: Expression,
+    ) -> None:
         # case of lib
         # (.. ? .. : ..).add
         if self.conditional_not_ahead(next_expr, true_expression, false_expression, f_called):
@@ -155,9 +179,7 @@ class SplitTernaryExpression:
         if expression.call_gas:
             # case of (..).func{gas: .. ? .. : ..}()
             next_expr = expression.call_gas
-                if self.conditional_not_ahead(
-                    next_expr, true_expression, false_expression, f_call_gas
-                ):
+            if self.conditional_not_ahead(next_expr, true_expression, false_expression, f_call_gas):
                 self.copy_expression(
                     next_expr,
                     true_expression.call_gas,
@@ -183,27 +205,11 @@ class SplitTernaryExpression:
         true_expression._arguments = []
         false_expression._arguments = []
 
-            for next_expr in expression.arguments:
-                if self.conditional_not_ahead(next_expr, true_expression, false_expression, f_call):
+        for expr in expression.arguments:
+            if self.conditional_not_ahead(expr, true_expression, false_expression, f_call):
                 # always on last arguments added
                 self.copy_expression(
-                        next_expr,
+                    expr,
                     true_expression.arguments[-1],
                     false_expression.arguments[-1],
                 )
-
-        elif isinstance(expression, (TypeConversion, UnaryOperation)):
-            next_expr = expression.expression
-            if self.conditional_not_ahead(
-                next_expr, true_expression, false_expression, f_expression
-            ):
-                self.copy_expression(
-                    expression.expression,
-                    true_expression.expression,
-                    false_expression.expression,
-                )
-
-        else:
-            raise SlitherException(
-                f"Ternary operation not handled {expression}({type(expression)})"
-            )