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Diffstat (limited to '.venv/lib/python3.12/site-packages/fsspec/gui.py')
| -rw-r--r-- | .venv/lib/python3.12/site-packages/fsspec/gui.py | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/fsspec/gui.py b/.venv/lib/python3.12/site-packages/fsspec/gui.py new file mode 100644 index 00000000..321379eb --- /dev/null +++ b/.venv/lib/python3.12/site-packages/fsspec/gui.py @@ -0,0 +1,416 @@ +import ast +import contextlib +import logging +import os +import re +from typing import ClassVar, Sequence + +import panel as pn + +from .core import OpenFile, get_filesystem_class, split_protocol +from .registry import known_implementations + +pn.extension() +logger = logging.getLogger("fsspec.gui") + + +class SigSlot: + """Signal-slot mixin, for Panel event passing + + Include this class in a widget manager's superclasses to be able to + register events and callbacks on Panel widgets managed by that class. + + The method ``_register`` should be called as widgets are added, and external + code should call ``connect`` to associate callbacks. + + By default, all signals emit a DEBUG logging statement. + """ + + # names of signals that this class may emit each of which must be + # set by _register for any new instance + signals: ClassVar[Sequence[str]] = [] + # names of actions that this class may respond to + slots: ClassVar[Sequence[str]] = [] + + # each of which must be a method name + + def __init__(self): + self._ignoring_events = False + self._sigs = {} + self._map = {} + self._setup() + + def _setup(self): + """Create GUI elements and register signals""" + self.panel = pn.pane.PaneBase() + # no signals to set up in the base class + + def _register( + self, widget, name, thing="value", log_level=logging.DEBUG, auto=False + ): + """Watch the given attribute of a widget and assign it a named event + + This is normally called at the time a widget is instantiated, in the + class which owns it. + + Parameters + ---------- + widget : pn.layout.Panel or None + Widget to watch. If None, an anonymous signal not associated with + any widget. + name : str + Name of this event + thing : str + Attribute of the given widget to watch + log_level : int + When the signal is triggered, a logging event of the given level + will be fired in the dfviz logger. + auto : bool + If True, automatically connects with a method in this class of the + same name. + """ + if name not in self.signals: + raise ValueError(f"Attempt to assign an undeclared signal: {name}") + self._sigs[name] = { + "widget": widget, + "callbacks": [], + "thing": thing, + "log": log_level, + } + wn = "-".join( + [ + getattr(widget, "name", str(widget)) if widget is not None else "none", + thing, + ] + ) + self._map[wn] = name + if widget is not None: + widget.param.watch(self._signal, thing, onlychanged=True) + if auto and hasattr(self, name): + self.connect(name, getattr(self, name)) + + def _repr_mimebundle_(self, *args, **kwargs): + """Display in a notebook or a server""" + try: + return self.panel._repr_mimebundle_(*args, **kwargs) + except (ValueError, AttributeError) as exc: + raise NotImplementedError( + "Panel does not seem to be set up properly" + ) from exc + + def connect(self, signal, slot): + """Associate call back with given event + + The callback must be a function which takes the "new" value of the + watched attribute as the only parameter. If the callback return False, + this cancels any further processing of the given event. + + Alternatively, the callback can be a string, in which case it means + emitting the correspondingly-named event (i.e., connect to self) + """ + self._sigs[signal]["callbacks"].append(slot) + + def _signal(self, event): + """This is called by a an action on a widget + + Within an self.ignore_events context, nothing happens. + + Tests can execute this method by directly changing the values of + widget components. + """ + if not self._ignoring_events: + wn = "-".join([event.obj.name, event.name]) + if wn in self._map and self._map[wn] in self._sigs: + self._emit(self._map[wn], event.new) + + @contextlib.contextmanager + def ignore_events(self): + """Temporarily turn off events processing in this instance + + (does not propagate to children) + """ + self._ignoring_events = True + try: + yield + finally: + self._ignoring_events = False + + def _emit(self, sig, value=None): + """An event happened, call its callbacks + + This method can be used in tests to simulate message passing without + directly changing visual elements. + + Calling of callbacks will halt whenever one returns False. + """ + logger.log(self._sigs[sig]["log"], f"{sig}: {value}") + for callback in self._sigs[sig]["callbacks"]: + if isinstance(callback, str): + self._emit(callback) + else: + try: + # running callbacks should not break the interface + ret = callback(value) + if ret is False: + break + except Exception as e: + logger.exception( + "Exception (%s) while executing callback for signal: %s", + e, + sig, + ) + + def show(self, threads=False): + """Open a new browser tab and display this instance's interface""" + self.panel.show(threads=threads, verbose=False) + return self + + +class SingleSelect(SigSlot): + """A multiselect which only allows you to select one item for an event""" + + signals = ["_selected", "selected"] # the first is internal + slots = ["set_options", "set_selection", "add", "clear", "select"] + + def __init__(self, **kwargs): + self.kwargs = kwargs + super().__init__() + + def _setup(self): + self.panel = pn.widgets.MultiSelect(**self.kwargs) + self._register(self.panel, "_selected", "value") + self._register(None, "selected") + self.connect("_selected", self.select_one) + + def _signal(self, *args, **kwargs): + super()._signal(*args, **kwargs) + + def select_one(self, *_): + with self.ignore_events(): + val = [self.panel.value[-1]] if self.panel.value else [] + self.panel.value = val + self._emit("selected", self.panel.value) + + def set_options(self, options): + self.panel.options = options + + def clear(self): + self.panel.options = [] + + @property + def value(self): + return self.panel.value + + def set_selection(self, selection): + self.panel.value = [selection] + + +class FileSelector(SigSlot): + """Panel-based graphical file selector widget + + Instances of this widget are interactive and can be displayed in jupyter by having + them as the output of a cell, or in a separate browser tab using ``.show()``. + """ + + signals = [ + "protocol_changed", + "selection_changed", + "directory_entered", + "home_clicked", + "up_clicked", + "go_clicked", + "filters_changed", + ] + slots = ["set_filters", "go_home"] + + def __init__(self, url=None, filters=None, ignore=None, kwargs=None): + """ + + Parameters + ---------- + url : str (optional) + Initial value of the URL to populate the dialog; should include protocol + filters : list(str) (optional) + File endings to include in the listings. If not included, all files are + allowed. Does not affect directories. + If given, the endings will appear as checkboxes in the interface + ignore : list(str) (optional) + Regex(s) of file basename patterns to ignore, e.g., "\\." for typical + hidden files on posix + kwargs : dict (optional) + To pass to file system instance + """ + if url: + self.init_protocol, url = split_protocol(url) + else: + self.init_protocol, url = "file", os.getcwd() + self.init_url = url + self.init_kwargs = (kwargs if isinstance(kwargs, str) else str(kwargs)) or "{}" + self.filters = filters + self.ignore = [re.compile(i) for i in ignore or []] + self._fs = None + super().__init__() + + def _setup(self): + self.url = pn.widgets.TextInput( + name="url", + value=self.init_url, + align="end", + sizing_mode="stretch_width", + width_policy="max", + ) + self.protocol = pn.widgets.Select( + options=sorted(known_implementations), + value=self.init_protocol, + name="protocol", + align="center", + ) + self.kwargs = pn.widgets.TextInput( + name="kwargs", value=self.init_kwargs, align="center" + ) + self.go = pn.widgets.Button(name="⇨", align="end", width=45) + self.main = SingleSelect(size=10) + self.home = pn.widgets.Button(name="🏠", width=40, height=30, align="end") + self.up = pn.widgets.Button(name="‹", width=30, height=30, align="end") + + self._register(self.protocol, "protocol_changed", auto=True) + self._register(self.go, "go_clicked", "clicks", auto=True) + self._register(self.up, "up_clicked", "clicks", auto=True) + self._register(self.home, "home_clicked", "clicks", auto=True) + self._register(None, "selection_changed") + self.main.connect("selected", self.selection_changed) + self._register(None, "directory_entered") + self.prev_protocol = self.protocol.value + self.prev_kwargs = self.storage_options + + self.filter_sel = pn.widgets.CheckBoxGroup( + value=[], options=[], inline=False, align="end", width_policy="min" + ) + self._register(self.filter_sel, "filters_changed", auto=True) + + self.panel = pn.Column( + pn.Row(self.protocol, self.kwargs), + pn.Row(self.home, self.up, self.url, self.go, self.filter_sel), + self.main.panel, + ) + self.set_filters(self.filters) + self.go_clicked() + + def set_filters(self, filters=None): + self.filters = filters + if filters: + self.filter_sel.options = filters + self.filter_sel.value = filters + else: + self.filter_sel.options = [] + self.filter_sel.value = [] + + @property + def storage_options(self): + """Value of the kwargs box as a dictionary""" + return ast.literal_eval(self.kwargs.value) or {} + + @property + def fs(self): + """Current filesystem instance""" + if self._fs is None: + cls = get_filesystem_class(self.protocol.value) + self._fs = cls(**self.storage_options) + return self._fs + + @property + def urlpath(self): + """URL of currently selected item""" + return ( + (f"{self.protocol.value}://{self.main.value[0]}") + if self.main.value + else None + ) + + def open_file(self, mode="rb", compression=None, encoding=None): + """Create OpenFile instance for the currently selected item + + For example, in a notebook you might do something like + + .. code-block:: + + [ ]: sel = FileSelector(); sel + + # user selects their file + + [ ]: with sel.open_file('rb') as f: + ... out = f.read() + + Parameters + ---------- + mode: str (optional) + Open mode for the file. + compression: str (optional) + The interact with the file as compressed. Set to 'infer' to guess + compression from the file ending + encoding: str (optional) + If using text mode, use this encoding; defaults to UTF8. + """ + if self.urlpath is None: + raise ValueError("No file selected") + return OpenFile(self.fs, self.urlpath, mode, compression, encoding) + + def filters_changed(self, values): + self.filters = values + self.go_clicked() + + def selection_changed(self, *_): + if self.urlpath is None: + return + if self.fs.isdir(self.urlpath): + self.url.value = self.fs._strip_protocol(self.urlpath) + self.go_clicked() + + def go_clicked(self, *_): + if ( + self.prev_protocol != self.protocol.value + or self.prev_kwargs != self.storage_options + ): + self._fs = None # causes fs to be recreated + self.prev_protocol = self.protocol.value + self.prev_kwargs = self.storage_options + listing = sorted( + self.fs.ls(self.url.value, detail=True), key=lambda x: x["name"] + ) + listing = [ + l + for l in listing + if not any(i.match(l["name"].rsplit("/", 1)[-1]) for i in self.ignore) + ] + folders = { + "📁 " + o["name"].rsplit("/", 1)[-1]: o["name"] + for o in listing + if o["type"] == "directory" + } + files = { + "📄 " + o["name"].rsplit("/", 1)[-1]: o["name"] + for o in listing + if o["type"] == "file" + } + if self.filters: + files = { + k: v + for k, v in files.items() + if any(v.endswith(ext) for ext in self.filters) + } + self.main.set_options(dict(**folders, **files)) + + def protocol_changed(self, *_): + self._fs = None + self.main.options = [] + self.url.value = "" + + def home_clicked(self, *_): + self.protocol.value = self.init_protocol + self.kwargs.value = self.init_kwargs + self.url.value = self.init_url + self.go_clicked() + + def up_clicked(self, *_): + self.url.value = self.fs._parent(self.url.value) + self.go_clicked() |