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How to use ReturnValueResolver method in Robotframework

Best Python code snippet using robotframework

assigner.py

Source:assigner.py

...82        return HandlerExecutionFailed(ErrorDetails(exc_info))83    def assign(self, return_value):84        context = self._context85        context.trace(lambda: 'Return: %s' % prepr(return_value))86        resolver = ReturnValueResolver(self._assignment)87        for name, value in resolver.resolve(return_value):88            if not self._extended_assign(name, value, context.variables):89                value = self._normal_assign(name, value, context.variables)90            context.info(format_assign_message(name, value))91    def _extended_assign(self, name, value, variables):92        if name[0] != '$' or '.' not in name or name in variables:93            return False94        base, attr = self._split_extended_assign(name)95        try:96            var = variables[base]97        except DataError:98            return False99        if not (self._variable_supports_extended_assign(var) and100                self._is_valid_extended_attribute(attr)):101            return False102        try:103            setattr(var, attr, value)104        except:105            raise VariableError("Setting attribute '%s' to variable '%s' "106                                "failed: %s" % (attr, base, get_error_message()))107        return True108    def _split_extended_assign(self, name):109        base, attr = name.rsplit('.', 1)110        return base.strip() + '}', attr[:-1].strip()111    def _variable_supports_extended_assign(self, var):112        return not (is_string(var) or is_number(var))113    def _is_valid_extended_attribute(self, attr):114        return self._valid_extended_attr.match(attr) is not None115    def _normal_assign(self, name, value, variables):116        variables[name] = value117        # Always return the actually assigned value.118        return value if name[0] == '$' else variables[name]119def ReturnValueResolver(assignment):120    if not assignment:121        return NoReturnValueResolver()122    if len(assignment) == 1:123        return OneReturnValueResolver(assignment[0])124    if any(a[0] == '@' for a in assignment):125        return ScalarsAndListReturnValueResolver(assignment)126    return ScalarsOnlyReturnValueResolver(assignment)127class NoReturnValueResolver(object):128    def resolve(self, return_value):129        return []130class OneReturnValueResolver(object):131    def __init__(self, variable):132        self._variable = variable133    def resolve(self, return_value):134        if return_value is None:135            identifier = self._variable[0]136            return_value = {'$': None, '@': [], '&': {}}[identifier]137        return [(self._variable, return_value)]138class _MultiReturnValueResolver(object):139    def __init__(self, variables):140        self._variables = variables141        self._min_count = len(variables)142    def resolve(self, return_value):143        return_value = self._convert_to_list(return_value)144        self._validate(len(return_value))145        return self._resolve(return_value)146    def _convert_to_list(self, return_value):147        if return_value is None:148            return [None] * self._min_count149        if is_string(return_value):150            self._raise_expected_list(return_value)151        try:152            return list(return_value)153        except TypeError:154            self._raise_expected_list(return_value)155    def _raise_expected_list(self, ret):156        self._raise('Expected list-like value, got %s.' % type_name(ret))157    def _raise(self, error):158        raise VariableError('Cannot set variables: %s' % error)159    def _validate(self, return_count):160        raise NotImplementedError161    def _resolve(self, return_value):162        raise NotImplementedError163class ScalarsOnlyReturnValueResolver(_MultiReturnValueResolver):164    def _validate(self, return_count):165        if return_count != self._min_count:166            self._raise('Expected %d return values, got %d.'167                        % (self._min_count, return_count))168    def _resolve(self, return_value):169        return list(zip(self._variables, return_value))170class ScalarsAndListReturnValueResolver(_MultiReturnValueResolver):171    def __init__(self, variables):172        _MultiReturnValueResolver.__init__(self, variables)173        self._min_count -= 1174    def _validate(self, return_count):175        if return_count < self._min_count:176            self._raise('Expected %d or more return values, got %d.'177                        % (self._min_count, return_count))178    def _resolve(self, return_value):179        before_vars, list_var, after_vars \180            = self._split_variables(self._variables)181        before_items, list_items, after_items \182            = self._split_return(return_value, before_vars, after_vars)183        before = list(zip(before_vars, before_items))184        after = list(zip(after_vars, after_items))...

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