Return the source mapping where the variable is declared

        Args:
            var (str): variable name
        Returns:
            (dict): sourceMapping

def get_source_var_declaration(self, var):
        """ Return the source mapping where the variable is declared

        Args:
            var (str): variable name
        Returns:
            (dict): sourceMapping
        """
        return next((x.source_mapping for x in self.variables if x.name == var))