Source code for pytezos.michelson.types.option

from typing import Callable
from typing import List
from typing import Optional
from typing import Type

from pytezos.context.abstract import AbstractContext
from pytezos.michelson.micheline import Micheline
from pytezos.michelson.micheline import parse_micheline_value
from pytezos.michelson.types.base import MichelsonType


class NoneLiteral(Micheline, prim='None'):
    pass


class SomeLiteral(Micheline, prim='Some', args_len=1):
    pass


class OptionType(MichelsonType, prim='option', args_len=1):
    def __init__(self, item: Optional[MichelsonType]):
        super(OptionType, self).__init__()
        self.item = item

    def __lt__(self, other: 'OptionType') -> bool:  # type: ignore
        if other.item is None:
            return False
        elif self.item is None:
            return True
        else:
            return self.item < other.item

    def __eq__(self, other) -> bool:  # type: ignore
        if not isinstance(other, OptionType):
            return False
        return self.item == other.item  # type: ignore

    def __hash__(self):
        return hash(self.item)

    def __repr__(self):
        return f'{repr(self.item)}?' if self.item else 'None'

    @staticmethod
    def none(some_type: Type[MichelsonType]) -> 'OptionType':
        cls = OptionType.create_type(args=[some_type])
        return cls(None)  # type: ignore

    @staticmethod
    def from_some(item: MichelsonType) -> 'OptionType':
        cls = OptionType.create_type(args=[item.get_anon_type()])
        return cls(item)  # type: ignore

    @classmethod
    def dummy(cls, context: AbstractContext) -> 'OptionType':
        return cls(None)

    @classmethod
    def generate_pydoc(cls, definitions: list, inferred_name=None, comparable=False):
        name = cls.field_name or cls.type_name or inferred_name
        arg_doc = cls.args[0].generate_pydoc(definitions, inferred_name=name)
        return f'{arg_doc} || None'

    @classmethod
    def from_micheline_value(cls, val_expr):
        item = parse_micheline_value(
            val_expr,
            {
                ('Some', 1): lambda x: cls.args[0].from_micheline_value(x[0]),
                ('None', 0): lambda x: None,
            },
        )
        return cls(item)

    @classmethod
    def from_python_object(cls, py_obj):
        if py_obj is None:
            item = None
        else:
            item = cls.args[0].from_python_object(py_obj)
        return cls(item)

    def is_none(self) -> bool:
        return self.item is None

    def get_some(self) -> MichelsonType:
        assert not self.is_none()
        return self.item  # type: ignore

    def to_literal(self) -> Type[Micheline]:
        if self.is_none():
            return NoneLiteral
        else:
            return SomeLiteral.create_type(args=[self.item.to_literal()])  # type: ignore

    def to_micheline_value(self, mode='readable', lazy_diff=False):
        if self.is_none():
            return {'prim': 'None'}
        else:
            arg = self.item.to_micheline_value(mode=mode, lazy_diff=lazy_diff)
            return {'prim': 'Some', 'args': [arg]}

    def to_python_object(self, try_unpack=False, lazy_diff=False, comparable=False):
        if self.is_none():
            return None
        else:
            return self.item.to_python_object(
                try_unpack=try_unpack,
                lazy_diff=lazy_diff,
                comparable=comparable,
            )

    def merge_lazy_diff(self, lazy_diff: List[dict]) -> 'MichelsonType':
        item = None if self.is_none() else self.item.merge_lazy_diff(lazy_diff)  # type: ignore
        return type(self)(item)

    def aggregate_lazy_diff(self, lazy_diff: List[dict], mode='readable') -> 'MichelsonType':
        item = None if self.is_none() else self.item.aggregate_lazy_diff(lazy_diff, mode=mode)  # type: ignore
        return type(self)(item)

    def attach_context(self, context: AbstractContext, big_map_copy=False):
        if not self.is_none():
            self.item.attach_context(context, big_map_copy=big_map_copy)  # type: ignore

    def find(self, predicate: Callable[['MichelsonType'], bool]) -> Optional['MichelsonType']:
        if predicate(self):
            return self
        if self.item is not None:
            return self.item.find(predicate)
        return None