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{#
# Python has a built-in `enum` module which is nice to use, but doesn't support
# variants with associated data. So, we switch here, and generate a stdlib `enum`
# when none of the variants have associated data, or a generic nested-class
# construct when they do.
#}
{% if e.is_flat() %}
class {{ type_name }}(enum.Enum):
{% for variant in e.variants() -%}
{{ variant.name()|enum_variant_py }} = {{ loop.index }}
{% endfor %}
{% else %}
class {{ type_name }}:
def __init__(self):
raise RuntimeError("{{ type_name }} cannot be instantiated directly")
# Each enum variant is a nested class of the enum itself.
{% for variant in e.variants() -%}
class {{ variant.name()|enum_variant_py }}:
{% for field in variant.fields() %}
{{- field.name()|var_name }}: "{{- field|type_name }}";
{%- endfor %}
@typing.no_type_check
def __init__(self,{% for field in variant.fields() %}{{ field.name()|var_name }}: "{{- field|type_name }}"{% if loop.last %}{% else %}, {% endif %}{% endfor %}):
{% if variant.has_fields() %}
{%- for field in variant.fields() %}
self.{{ field.name()|var_name }} = {{ field.name()|var_name }}
{%- endfor %}
{% else %}
pass
{% endif %}
def __str__(self):
return "{{ type_name }}.{{ variant.name()|enum_variant_py }}({% for field in variant.fields() %}{{ field.name()|var_name }}={}{% if loop.last %}{% else %}, {% endif %}{% endfor %})".format({% for field in variant.fields() %}self.{{ field.name()|var_name }}{% if loop.last %}{% else %}, {% endif %}{% endfor %})
def __eq__(self, other):
if not other.is_{{ variant.name()|var_name }}():
return False
{%- for field in variant.fields() %}
if self.{{ field.name()|var_name }} != other.{{ field.name()|var_name }}:
return False
{%- endfor %}
return True
{% endfor %}
# For each variant, we have an `is_NAME` method for easily checking
# whether an instance is that variant.
{% for variant in e.variants() -%}
def is_{{ variant.name()|var_name }}(self) -> bool:
return isinstance(self, {{ type_name }}.{{ variant.name()|enum_variant_py }})
{% endfor %}
# Now, a little trick - we make each nested variant class be a subclass of the main
# enum class, so that method calls and instance checks etc will work intuitively.
# We might be able to do this a little more neatly with a metaclass, but this'll do.
{% for variant in e.variants() -%}
{{ type_name }}.{{ variant.name()|enum_variant_py }} = type("{{ type_name }}.{{ variant.name()|enum_variant_py }}", ({{ type_name }}.{{variant.name()|enum_variant_py}}, {{ type_name }},), {}) # type: ignore
{% endfor %}
{% endif %}
class {{ ffi_converter_name }}(_UniffiConverterRustBuffer):
@staticmethod
def read(buf):
variant = buf.read_i32()
{%- for variant in e.variants() %}
if variant == {{ loop.index }}:
{%- if e.is_flat() %}
return {{ type_name }}.{{variant.name()|enum_variant_py}}
{%- else %}
return {{ type_name }}.{{variant.name()|enum_variant_py}}(
{%- for field in variant.fields() %}
{{ field|read_fn }}(buf),
{%- endfor %}
)
{%- endif %}
{%- endfor %}
raise InternalError("Raw enum value doesn't match any cases")
def write(value, buf):
{%- for variant in e.variants() %}
{%- if e.is_flat() %}
if value == {{ type_name }}.{{ variant.name()|enum_variant_py }}:
buf.write_i32({{ loop.index }})
{%- else %}
if value.is_{{ variant.name()|var_name }}():
buf.write_i32({{ loop.index }})
{%- for field in variant.fields() %}
{{ field|write_fn }}(value.{{ field.name()|var_name }}, buf)
{%- endfor %}
{%- endif %}
{%- endfor %}
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