| # Copyright 2019 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| from .idl_type import IdlType |
| |
| |
| class LiteralConstant(object): |
| """ |
| Represents a literal constant. |
| |
| Literal constants are used as: |
| - constant values of IDL constants |
| - default values of IDL operation's arguments |
| - default values of IDL dictionary members |
| """ |
| |
| def __init__(self, idl_type=None, value=None, literal=None): |
| assert isinstance(idl_type, IdlType) |
| assert isinstance(literal, str) |
| |
| self._idl_type = idl_type |
| self._value = value |
| self._literal = literal |
| |
| @property |
| def idl_type(self): |
| """ |
| Returns the type of the literal constant. |
| |
| The types of the following literals are represented as follows. |
| - null: any? |
| - []: sequence<any> |
| - {}: object |
| - true / false: boolean |
| - INTEGER_NUMERICS: long |
| - FLOATING_POINTS: double |
| - STRING: DOMString |
| """ |
| return self._idl_type |
| |
| @property |
| def value(self): |
| """ |
| Returns the value as a Python value. |
| |
| The values of the following literals are represented as follows. |
| - null: None |
| - []: list() |
| - {}: dict() |
| - true / false: True / False |
| - INTEGER_NUMERICS: an instance of long |
| - FLOATING_POINTS: an instance of float |
| - STRING: an instance of str |
| """ |
| return self._value |
| |
| @property |
| def literal(self): |
| """Returns the literal representation.""" |
| return self._literal |
| |
| def is_type_compatible_with(self, idl_type): |
| """Returns True if |idl_type| can store this value.""" |
| assert isinstance(idl_type, IdlType) |
| |
| idl_type = idl_type.unwrap(nullable=False) |
| |
| if idl_type.is_any: |
| return True |
| |
| if self.idl_type.is_nullable: |
| return idl_type.does_include_nullable_type |
| |
| idl_type = idl_type.unwrap() |
| |
| if idl_type.is_union: |
| return any( |
| self.is_type_compatible_with(member_type) |
| for member_type in idl_type.flattened_member_types) |
| |
| if self.idl_type.is_sequence: |
| return idl_type.is_sequence |
| if self.idl_type.is_object: |
| return idl_type.is_dictionary |
| if self.idl_type.is_boolean: |
| return idl_type.is_boolean |
| if self.idl_type.is_integer: |
| return idl_type.is_numeric |
| if self.idl_type.is_floating_point_numeric: |
| return idl_type.is_floating_point_numeric |
| if self.idl_type.is_string: |
| return idl_type.is_string or idl_type.is_enumeration |
