def visit_expr(self, node): # Attempt compile-time evaluation first try: result = eval_ast(node, self.symdict) except: result = None if isinstance(result, int): return result if isinstance(node, ast.Call): return self.visit_expr_call(node) elif isinstance(node, ast.BinOp): return self.visit_expr_binop(node) elif isinstance(node, ast.Compare): return self.visit_expr_compare(node) elif isinstance(node, ast.Name): return self.visit_expr_name(node) elif isinstance(node, ast.Num): return self.visit_expr_num(node) elif isinstance(node, ast.Attribute): return self.visit_expr_attribute(node) elif isinstance(node, ast.Subscript): return self.visit_expr_subscript(node) else: raise NotImplementedError
def visit_expr(self, node):
# Attempt compile-time evaluation first
try:
result = eval_ast(node, self.symdict)
except:
result = None
if isinstance(result, int):
return result
if isinstance(node, ast.Call):
return self.visit_expr_call(node)
elif isinstance(node, ast.BinOp):
return self.visit_expr_binop(node)
elif isinstance(node, ast.Compare):
return self.visit_expr_compare(node)
elif isinstance(node, ast.Name):
return self.visit_expr_name(node)
elif isinstance(node, ast.Num):
return self.visit_expr_num(node)
elif isinstance(node, ast.Attribute):
return self.visit_expr_attribute(node)
elif isinstance(node, ast.Subscript):
return self.visit_expr_subscript(node)
else:
raise NotImplementedError
def visit_expr_call(self, node):
if isinstance(node.func, ast.Name):
callee = self.symdict[node.func.id]
else:
raise NotImplementedError
if callee == transel.bitslice:
if len(node.args) != 2 and len(node.args) != 3:
raise TypeError("bitslice() takes 2 or 3 arguments")
val = self.visit_expr(node.args[0])
low = eval_ast(node.args[1], self.symdict)
if len(node.args) == 3:
up = eval_ast(node.args[2], self.symdict)
else:
up = low + 1
return _Slice(val, low, up)
else:
raise NotImplementedError
def visit_expr_call(self, node):
if isinstance(node.func, ast.Name):
callee = self.symdict[node.func.id]
else:
raise NotImplementedError
if callee == transel.bitslice:
if len(node.args) != 2 and len(node.args) != 3:
raise TypeError("bitslice() takes 2 or 3 arguments")
val = self.visit_expr(node.args[0])
low = eval_ast(node.args[1], self.symdict)
if len(node.args) == 3:
up = eval_ast(node.args[2], self.symdict)
else:
up = low + 1
return _Slice(val, low, up)
else:
raise NotImplementedError