def _validate_return(self, node: ast.AST): if (self._current_method.return_type is not Type.none and hasattr(node, 'body') and not self._has_return(node)): lst = list(self.symbols.items()) keys, values = [key_value[0] for key_value in lst], [key_value[-1] for key_value in lst] self._log_error( CompilerError.MissingReturnStatement( line=node.lineno, col=node.col_offset, symbol_id=keys[values.index(self._current_method)] ) )
def _read_metadata_object(self, function: ast.FunctionDef): """ Gets the metadata object defined in this function :param function: """ if self._metadata is not None: # metadata function has been defined already self._log_warning( CompilerWarning.RedeclaredSymbol( line=function.lineno, col=function.col_offset, symbol_id=Builtin.Metadata.identifier)) # this function must have a return and no arguments elif len(function.args.args) != 0: self._log_error( CompilerError.UnexpectedArgument(line=function.lineno, col=function.col_offset)) elif not any(isinstance(stmt, ast.Return) for stmt in function.body): self._log_error( CompilerError.MissingReturnStatement(line=function.lineno, col=function.col_offset, symbol_id=function.name)) else: function.returns = None function.decorator_list = [] module: ast.Module = ast.parse('') module.body = [ node for node in self._tree.body if isinstance(node, (ast.ImportFrom, ast.Import)) ] module.body.append(function) ast.copy_location(module, function) # executes the function code = compile(module, filename='<boa3>', mode='exec') namespace = {} exec(code, namespace) obj: Any = namespace[function.name]() node: ast.AST = function.body[-1] if len( function.body) > 0 else function # return must be a NeoMetadata object if not isinstance(obj, NeoMetadata): obj_type = self.get_type(obj).identifier if self.get_type( obj) is not Type.any else type(obj).__name__ self._log_error( CompilerError.MismatchedTypes( line=node.lineno, col=node.col_offset, expected_type_id=NeoMetadata.__name__, actual_type_id=obj_type)) return # validates the metadata attributes types attributes: Dict[str, Any] = { attr: value for attr, value in dict(obj.__dict__).items() if attr in Builtin.metadata_fields } if any(not isinstance(value, Builtin.metadata_fields[attr]) for attr, value in attributes.items()): for expected, actual in [ (Builtin.metadata_fields[attr], type(v_type)) for attr, v_type in attributes.items() if not isinstance(v_type, Builtin.metadata_fields[attr]) ]: if isinstance(expected, Iterable): expected_id = 'Union[{0}]'.format(', '.join( [tpe.__name__ for tpe in expected])) elif hasattr(expected, '__name__'): expected_id = expected.__name__ else: expected_id = str(expected) self._log_error( CompilerError.MismatchedTypes( line=node.lineno, col=node.col_offset, expected_type_id=expected_id, actual_type_id=actual.__name__)) else: # if the function was defined correctly, sets the metadata object of the smart contract self._metadata = obj self._metadata_node = function # for error messages only