106 lines
3.8 KiB
Python
106 lines
3.8 KiB
Python
from __future__ import annotations
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import inspect
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from functools import update_wrapper
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from pathlib import Path
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from typing import Callable, Generic, ParamSpec
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from .registry import PageDefinition, registry
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P = ParamSpec("P")
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VariantSelection = int | list[int] | tuple[int, ...]
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def normalise_variants(value: VariantSelection) -> tuple[int, ...]:
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"""Snapshot a 1-based priority list, validating every fallback eagerly."""
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variants = (value,) if type(value) is int else value
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if not isinstance(variants, (list, tuple)) or not variants or any(
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type(item) is not int or item < 1 for item in variants
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):
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raise ValueError(
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"component_variant must be a positive integer or a non-empty list/tuple "
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"of positive integers (1-based)"
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)
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return tuple(variants)
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class ComponentOutput(tuple[str, ...]):
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"""A component's alternatives, distinct from a page's sequence of blocks."""
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component_name: str
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def __new__(cls, variants: tuple[str, ...], name: str):
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output = super().__new__(cls, variants)
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output.component_name = name
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return output
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def select(self, variant: VariantSelection) -> str:
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variants = normalise_variants(variant)
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for candidate in variants:
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if candidate <= len(self):
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return self[candidate - 1]
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requested = f"variant {variants[0]}" if len(variants) == 1 else f"variants {list(variants)}"
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raise ValueError(
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f"Component {self.component_name} has {len(self)} variant(s); requested {requested}"
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)
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def _normalise_page_number(number: str | int | float) -> str:
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value = str(number).strip().strip(".")
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parts = [part.strip() for part in value.split(".")]
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if not value or any(not part for part in parts):
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raise ValueError("Page number must contain non-empty dot-separated parts")
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return ".".join(parts)
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class Component(Generic[P]):
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"""Normalise a component's string or list/tuple of strings into variants."""
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def __init__(self, function: Callable[P, str | list[str] | tuple[str, ...]]) -> None:
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if not callable(function):
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raise TypeError("@Component must decorate a callable")
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self.function = function
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update_wrapper(self, function)
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def __call__(self, *args: P.args, **kwargs: P.kwargs) -> ComponentOutput:
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result = self.function(*args, **kwargs)
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if isinstance(result, str):
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result = (result,)
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if not isinstance(result, (list, tuple)) or not result or any(
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not isinstance(item, str) for item in result
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):
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raise TypeError(
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f"Component {self.__name__} must return str or a non-empty list/tuple of strings"
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)
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return ComponentOutput(tuple(result), self.__name__)
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class Page:
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"""Register a zero-argument function as a numbered documentation page."""
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def __init__(self, number: str | int | float, title: str) -> None:
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self.number = _normalise_page_number(number)
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self.title = str(title).strip()
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if not self.title:
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raise ValueError("Page title cannot be empty")
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def __call__(self, function: Callable[[], object]) -> Callable[[], object]:
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signature = inspect.signature(function)
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if signature.parameters:
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raise TypeError(f"Page function {function.__name__} must not accept arguments")
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source = inspect.getsourcefile(function)
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source_file = str(Path(source).resolve()) if source else None
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registry.register(
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PageDefinition(
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number=self.number,
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title=self.title,
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render=function,
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module=function.__module__,
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source_file=source_file,
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)
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)
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return function
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__all__ = ["Component", "Page"]
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