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126 lines
4.2 KiB
126 lines
4.2 KiB
"""Sphinx core events.
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Gracefully adapted from the TextPress system by Armin.
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"""
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from __future__ import annotations
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import contextlib
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from collections import defaultdict
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from operator import attrgetter
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from typing import TYPE_CHECKING, Any, Callable, NamedTuple
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from sphinx.errors import ExtensionError, SphinxError
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from sphinx.locale import __
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from sphinx.util import logging
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from sphinx.util.inspect import safe_getattr
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if TYPE_CHECKING:
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from sphinx.application import Sphinx
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logger = logging.getLogger(__name__)
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class EventListener(NamedTuple):
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id: int
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handler: Callable
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priority: int
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# List of all known core events. Maps name to arguments description.
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core_events = {
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'builder-inited': '',
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'config-inited': 'config',
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'env-get-outdated': 'env, added, changed, removed',
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'env-get-updated': 'env',
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'env-purge-doc': 'env, docname',
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'env-before-read-docs': 'env, docnames',
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'env-check-consistency': 'env',
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'source-read': 'docname, source text',
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'include-read': 'relative path, parent docname, source text',
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'doctree-read': 'the doctree before being pickled',
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'env-merge-info': 'env, read docnames, other env instance',
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'missing-reference': 'env, node, contnode',
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'warn-missing-reference': 'domain, node',
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'doctree-resolved': 'doctree, docname',
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'env-updated': 'env',
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'build-finished': 'exception',
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}
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class EventManager:
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"""Event manager for Sphinx."""
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def __init__(self, app: Sphinx) -> None:
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self.app = app
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self.events = core_events.copy()
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self.listeners: dict[str, list[EventListener]] = defaultdict(list)
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self.next_listener_id = 0
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def add(self, name: str) -> None:
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"""Register a custom Sphinx event."""
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if name in self.events:
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raise ExtensionError(__('Event %r already present') % name)
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self.events[name] = ''
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def connect(self, name: str, callback: Callable, priority: int) -> int:
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"""Connect a handler to specific event."""
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if name not in self.events:
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raise ExtensionError(__('Unknown event name: %s') % name)
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listener_id = self.next_listener_id
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self.next_listener_id += 1
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self.listeners[name].append(EventListener(listener_id, callback, priority))
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return listener_id
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def disconnect(self, listener_id: int) -> None:
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"""Disconnect a handler."""
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for listeners in self.listeners.values():
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for listener in listeners.copy():
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if listener.id == listener_id:
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listeners.remove(listener)
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def emit(
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self, name: str, *args: Any, allowed_exceptions: tuple[type[Exception], ...] = ()
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) -> list:
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"""Emit a Sphinx event."""
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# not every object likes to be repr()'d (think
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# random stuff coming via autodoc)
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with contextlib.suppress(Exception):
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logger.debug('[app] emitting event: %r%s', name, repr(args)[:100])
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results = []
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listeners = sorted(self.listeners[name], key=attrgetter('priority'))
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for listener in listeners:
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try:
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results.append(listener.handler(self.app, *args))
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except allowed_exceptions:
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# pass through the errors specified as *allowed_exceptions*
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raise
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except SphinxError:
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raise
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except Exception as exc:
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if self.app.pdb:
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# Just pass through the error, so that it can be debugged.
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raise
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modname = safe_getattr(listener.handler, '__module__', None)
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raise ExtensionError(
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__('Handler %r for event %r threw an exception')
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% (listener.handler, name),
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exc,
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modname=modname,
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) from exc
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return results
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def emit_firstresult(
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self, name: str, *args: Any, allowed_exceptions: tuple[type[Exception], ...] = ()
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) -> Any:
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"""Emit a Sphinx event and returns first result.
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This returns the result of the first handler that doesn't return ``None``.
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"""
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for result in self.emit(name, *args, allowed_exceptions=allowed_exceptions):
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if result is not None:
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return result
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return None
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