271 lines
9.5 KiB
Python
271 lines
9.5 KiB
Python
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from __future__ import absolute_import
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import inspect
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from inspect import cleandoc, getdoc, getfile, isclass, ismodule, signature
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from typing import Any, Collection, Iterable, Optional, Tuple, Type, Union
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from .console import Group, RenderableType
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from .control import escape_control_codes
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from .highlighter import ReprHighlighter
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from .jupyter import JupyterMixin
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from .panel import Panel
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from .pretty import Pretty
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from .table import Table
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from .text import Text, TextType
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def _first_paragraph(doc: str) -> str:
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"""Get the first paragraph from a docstring."""
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paragraph, _, _ = doc.partition("\n\n")
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return paragraph
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class Inspect(JupyterMixin):
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"""A renderable to inspect any Python Object.
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Args:
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obj (Any): An object to inspect.
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title (str, optional): Title to display over inspect result, or None use type. Defaults to None.
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help (bool, optional): Show full help text rather than just first paragraph. Defaults to False.
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methods (bool, optional): Enable inspection of callables. Defaults to False.
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docs (bool, optional): Also render doc strings. Defaults to True.
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private (bool, optional): Show private attributes (beginning with underscore). Defaults to False.
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dunder (bool, optional): Show attributes starting with double underscore. Defaults to False.
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sort (bool, optional): Sort attributes alphabetically. Defaults to True.
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all (bool, optional): Show all attributes. Defaults to False.
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value (bool, optional): Pretty print value of object. Defaults to True.
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"""
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def __init__(
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self,
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obj: Any,
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*,
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title: Optional[TextType] = None,
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help: bool = False,
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methods: bool = False,
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docs: bool = True,
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private: bool = False,
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dunder: bool = False,
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sort: bool = True,
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all: bool = True,
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value: bool = True,
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) -> None:
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self.highlighter = ReprHighlighter()
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self.obj = obj
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self.title = title or self._make_title(obj)
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if all:
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methods = private = dunder = True
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self.help = help
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self.methods = methods
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self.docs = docs or help
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self.private = private or dunder
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self.dunder = dunder
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self.sort = sort
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self.value = value
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def _make_title(self, obj: Any) -> Text:
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"""Make a default title."""
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title_str = (
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str(obj)
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if (isclass(obj) or callable(obj) or ismodule(obj))
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else str(type(obj))
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)
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title_text = self.highlighter(title_str)
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return title_text
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def __rich__(self) -> Panel:
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return Panel.fit(
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Group(*self._render()),
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title=self.title,
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border_style="scope.border",
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padding=(0, 1),
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)
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def _get_signature(self, name: str, obj: Any) -> Optional[Text]:
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"""Get a signature for a callable."""
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try:
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_signature = str(signature(obj)) + ":"
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except ValueError:
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_signature = "(...)"
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except TypeError:
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return None
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source_filename: Optional[str] = None
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try:
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source_filename = getfile(obj)
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except (OSError, TypeError):
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# OSError is raised if obj has no source file, e.g. when defined in REPL.
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pass
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callable_name = Text(name, style="inspect.callable")
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if source_filename:
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callable_name.stylize(f"link file://{source_filename}")
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signature_text = self.highlighter(_signature)
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qualname = name or getattr(obj, "__qualname__", name)
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# If obj is a module, there may be classes (which are callable) to display
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if inspect.isclass(obj):
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prefix = "class"
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elif inspect.iscoroutinefunction(obj):
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prefix = "async def"
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else:
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prefix = "def"
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qual_signature = Text.assemble(
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(f"{prefix} ", f"inspect.{prefix.replace(' ', '_')}"),
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(qualname, "inspect.callable"),
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signature_text,
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)
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return qual_signature
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def _render(self) -> Iterable[RenderableType]:
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"""Render object."""
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def sort_items(item: Tuple[str, Any]) -> Tuple[bool, str]:
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key, (_error, value) = item
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return (callable(value), key.strip("_").lower())
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def safe_getattr(attr_name: str) -> Tuple[Any, Any]:
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"""Get attribute or any exception."""
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try:
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return (None, getattr(obj, attr_name))
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except Exception as error:
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return (error, None)
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obj = self.obj
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keys = dir(obj)
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total_items = len(keys)
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if not self.dunder:
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keys = [key for key in keys if not key.startswith("__")]
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if not self.private:
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keys = [key for key in keys if not key.startswith("_")]
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not_shown_count = total_items - len(keys)
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items = [(key, safe_getattr(key)) for key in keys]
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if self.sort:
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items.sort(key=sort_items)
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items_table = Table.grid(padding=(0, 1), expand=False)
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items_table.add_column(justify="right")
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add_row = items_table.add_row
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highlighter = self.highlighter
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if callable(obj):
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signature = self._get_signature("", obj)
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if signature is not None:
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yield signature
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yield ""
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if self.docs:
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_doc = self._get_formatted_doc(obj)
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if _doc is not None:
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doc_text = Text(_doc, style="inspect.help")
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doc_text = highlighter(doc_text)
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yield doc_text
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yield ""
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if self.value and not (isclass(obj) or callable(obj) or ismodule(obj)):
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yield Panel(
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Pretty(obj, indent_guides=True, max_length=10, max_string=60),
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border_style="inspect.value.border",
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)
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yield ""
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for key, (error, value) in items:
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key_text = Text.assemble(
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(
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key,
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"inspect.attr.dunder" if key.startswith("__") else "inspect.attr",
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),
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(" =", "inspect.equals"),
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)
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if error is not None:
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warning = key_text.copy()
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warning.stylize("inspect.error")
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add_row(warning, highlighter(repr(error)))
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continue
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if callable(value):
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if not self.methods:
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continue
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_signature_text = self._get_signature(key, value)
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if _signature_text is None:
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add_row(key_text, Pretty(value, highlighter=highlighter))
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else:
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if self.docs:
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docs = self._get_formatted_doc(value)
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if docs is not None:
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_signature_text.append("\n" if "\n" in docs else " ")
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doc = highlighter(docs)
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doc.stylize("inspect.doc")
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_signature_text.append(doc)
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add_row(key_text, _signature_text)
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else:
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add_row(key_text, Pretty(value, highlighter=highlighter))
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if items_table.row_count:
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yield items_table
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elif not_shown_count:
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yield Text.from_markup(
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f"[b cyan]{not_shown_count}[/][i] attribute(s) not shown.[/i] "
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f"Run [b][magenta]inspect[/]([not b]inspect[/])[/b] for options."
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)
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def _get_formatted_doc(self, object_: Any) -> Optional[str]:
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"""
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Extract the docstring of an object, process it and returns it.
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The processing consists in cleaning up the doctring's indentation,
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taking only its 1st paragraph if `self.help` is not True,
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and escape its control codes.
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Args:
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object_ (Any): the object to get the docstring from.
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Returns:
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Optional[str]: the processed docstring, or None if no docstring was found.
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"""
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docs = getdoc(object_)
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if docs is None:
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return None
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docs = cleandoc(docs).strip()
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if not self.help:
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docs = _first_paragraph(docs)
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return escape_control_codes(docs)
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def get_object_types_mro(obj: Union[object, Type[Any]]) -> Tuple[type, ...]:
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"""Returns the MRO of an object's class, or of the object itself if it's a class."""
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if not hasattr(obj, "__mro__"):
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# N.B. we cannot use `if type(obj) is type` here because it doesn't work with
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# some types of classes, such as the ones that use abc.ABCMeta.
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obj = type(obj)
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return getattr(obj, "__mro__", ())
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def get_object_types_mro_as_strings(obj: object) -> Collection[str]:
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"""
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Returns the MRO of an object's class as full qualified names, or of the object itself if it's a class.
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Examples:
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`object_types_mro_as_strings(JSONDecoder)` will return `['json.decoder.JSONDecoder', 'builtins.object']`
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"""
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return [
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f'{getattr(type_, "__module__", "")}.{getattr(type_, "__qualname__", "")}'
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for type_ in get_object_types_mro(obj)
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]
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def is_object_one_of_types(
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obj: object, fully_qualified_types_names: Collection[str]
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) -> bool:
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"""
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Returns `True` if the given object's class (or the object itself, if it's a class) has one of the
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fully qualified names in its MRO.
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"""
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for type_name in get_object_types_mro_as_strings(obj):
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if type_name in fully_qualified_types_names:
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return True
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return False
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