faaf7912b1
- Make struct into a type constuctor - Rework placeholders - Got rid of 'PrimitiveType' as a concept - Moved out the prelude to its own folder
68 lines
1.9 KiB
Python
68 lines
1.9 KiB
Python
"""
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Contains the placeholder for types for use in Phasm.
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These are temporary while the compiler is calculating all the types and validating them.
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"""
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from typing import Any, Iterable, List, Optional, Protocol, Union
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from .types import Type3
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TYPE3_ASSERTION_ERROR = 'You must call phasm_type3 after calling phasm_parse before you can call any other method'
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class ExpressionProtocol(Protocol):
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"""
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A protocol for classes that should be updated on substitution
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"""
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type3: 'Type3OrPlaceholder'
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"""
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The type to update
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"""
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class PlaceholderForType:
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"""
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A placeholder type, for when we don't know the final type yet
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"""
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__slots__ = ('update_on_substitution', 'resolve_as', )
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update_on_substitution: List[ExpressionProtocol]
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resolve_as: Optional[Type3]
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def __init__(self, update_on_substitution: Iterable[ExpressionProtocol]) -> None:
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self.update_on_substitution = [*update_on_substitution]
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self.resolve_as = None
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def __repr__(self) -> str:
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uos = ', '.join(repr(x) for x in self.update_on_substitution)
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return f'PlaceholderForType({id(self)}, [{uos}])'
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def __str__(self) -> str:
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return f'PhFT_{id(self)}'
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def __format__(self, format_spec: str) -> str:
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if format_spec != 's':
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raise TypeError('unsupported format string passed to Type3.__format__')
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return str(self)
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def __eq__(self, other: Any) -> bool:
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if isinstance(other, Type3):
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return False
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if not isinstance(other, PlaceholderForType):
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raise NotImplementedError
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return self is other
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def __ne__(self, other: Any) -> bool:
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return not self.__eq__(other)
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def __hash__(self) -> int:
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return 0 # Valid but performs badly
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def __bool__(self) -> bool:
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raise NotImplementedError
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Type3OrPlaceholder = Union[Type3, PlaceholderForType]
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