430 lines
15 KiB
Python
430 lines
15 KiB
Python
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import abc
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import collections
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import inspect
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import sys
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import uuid
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import random
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from .._utils import patch_collections_abc, stringify_id, OrderedSet
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MutableSequence = patch_collections_abc("MutableSequence")
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rd = random.Random(0)
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# pylint: disable=no-init,too-few-public-methods
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class ComponentRegistry:
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"""Holds a registry of the namespaces used by components."""
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registry = OrderedSet()
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children_props = collections.defaultdict(dict)
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@classmethod
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def get_resources(cls, resource_name):
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resources = []
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for module_name in cls.registry:
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module = sys.modules[module_name]
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resources.extend(getattr(module, resource_name, []))
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return resources
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class ComponentMeta(abc.ABCMeta):
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# pylint: disable=arguments-differ
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def __new__(mcs, name, bases, attributes):
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component = abc.ABCMeta.__new__(mcs, name, bases, attributes)
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module = attributes["__module__"].split(".")[0]
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if name == "Component" or module == "builtins":
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# Don't do the base component
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# and the components loaded dynamically by load_component
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# as it doesn't have the namespace.
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return component
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ComponentRegistry.registry.add(module)
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ComponentRegistry.children_props[attributes.get("_namespace", module)][
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name
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] = attributes.get("_children_props")
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return component
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def is_number(s):
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try:
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float(s)
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return True
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except ValueError:
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return False
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def _check_if_has_indexable_children(item):
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if not hasattr(item, "children") or (
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not isinstance(item.children, Component)
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and not isinstance(item.children, (tuple, MutableSequence))
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):
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raise KeyError
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class Component(metaclass=ComponentMeta):
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_children_props = []
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_base_nodes = ["children"]
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class _UNDEFINED:
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def __repr__(self):
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return "undefined"
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def __str__(self):
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return "undefined"
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UNDEFINED = _UNDEFINED()
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class _REQUIRED:
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def __repr__(self):
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return "required"
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def __str__(self):
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return "required"
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REQUIRED = _REQUIRED()
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def __init__(self, **kwargs):
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import dash # pylint: disable=import-outside-toplevel, cyclic-import
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# pylint: disable=super-init-not-called
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for k, v in list(kwargs.items()):
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# pylint: disable=no-member
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k_in_propnames = k in self._prop_names
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k_in_wildcards = any(
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k.startswith(w) for w in self._valid_wildcard_attributes
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)
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# e.g. "The dash_core_components.Dropdown component (version 1.6.0)
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# with the ID "my-dropdown"
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id_suffix = f' with the ID "{kwargs["id"]}"' if "id" in kwargs else ""
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try:
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# Get fancy error strings that have the version numbers
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error_string_prefix = "The `{}.{}` component (version {}){}"
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# These components are part of dash now, so extract the dash version:
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dash_packages = {
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"dash_html_components": "html",
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"dash_core_components": "dcc",
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"dash_table": "dash_table",
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}
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if self._namespace in dash_packages:
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error_string_prefix = error_string_prefix.format(
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dash_packages[self._namespace],
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self._type,
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dash.__version__,
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id_suffix,
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)
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else:
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# Otherwise import the package and extract the version number
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error_string_prefix = error_string_prefix.format(
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self._namespace,
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self._type,
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getattr(__import__(self._namespace), "__version__", "unknown"),
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id_suffix,
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)
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except ImportError:
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# Our tests create mock components with libraries that
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# aren't importable
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error_string_prefix = f"The `{self._type}` component{id_suffix}"
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if not k_in_propnames and not k_in_wildcards:
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allowed_args = ", ".join(
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sorted(self._prop_names)
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) # pylint: disable=no-member
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raise TypeError(
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f"{error_string_prefix} received an unexpected keyword argument: `{k}`"
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f"\nAllowed arguments: {allowed_args}"
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)
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if k not in self._base_nodes and isinstance(v, Component):
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raise TypeError(
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error_string_prefix
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+ " detected a Component for a prop other than `children`\n"
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+ f"Prop {k} has value {v!r}\n\n"
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+ "Did you forget to wrap multiple `children` in an array?\n"
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+ 'For example, it must be html.Div(["a", "b", "c"]) not html.Div("a", "b", "c")\n'
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)
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if k == "id":
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if isinstance(v, dict):
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for id_key, id_val in v.items():
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if not isinstance(id_key, str):
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raise TypeError(
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"dict id keys must be strings,\n"
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+ f"found {id_key!r} in id {v!r}"
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)
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if not isinstance(id_val, (str, int, float, bool)):
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raise TypeError(
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"dict id values must be strings, numbers or bools,\n"
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+ f"found {id_val!r} in id {v!r}"
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)
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elif not isinstance(v, str):
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raise TypeError(f"`id` prop must be a string or dict, not {v!r}")
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setattr(self, k, v)
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def _set_random_id(self):
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if hasattr(self, "id"):
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return getattr(self, "id")
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kind = f"`{self._namespace}.{self._type}`" # pylint: disable=no-member
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if getattr(self, "persistence", False):
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raise RuntimeError(
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f"""
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Attempting to use an auto-generated ID with the `persistence` prop.
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This is prohibited because persistence is tied to component IDs and
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auto-generated IDs can easily change.
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Please assign an explicit ID to this {kind} component.
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"""
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)
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if "dash_snapshots" in sys.modules:
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raise RuntimeError(
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f"""
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Attempting to use an auto-generated ID in an app with `dash_snapshots`.
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This is prohibited because snapshots saves the whole app layout,
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including component IDs, and auto-generated IDs can easily change.
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Callbacks referencing the new IDs will not work with old snapshots.
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Please assign an explicit ID to this {kind} component.
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"""
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)
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v = str(uuid.UUID(int=rd.randint(0, 2**128)))
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setattr(self, "id", v)
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return v
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def to_plotly_json(self):
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# Add normal properties
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props = {
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p: getattr(self, p)
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for p in self._prop_names # pylint: disable=no-member
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if hasattr(self, p)
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}
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# Add the wildcard properties data-* and aria-*
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props.update(
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{
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k: getattr(self, k)
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for k in self.__dict__
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if any(
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k.startswith(w)
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# pylint:disable=no-member
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for w in self._valid_wildcard_attributes
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)
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}
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)
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as_json = {
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"props": props,
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"type": self._type, # pylint: disable=no-member
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"namespace": self._namespace, # pylint: disable=no-member
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}
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return as_json
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# pylint: disable=too-many-branches, too-many-return-statements
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# pylint: disable=redefined-builtin, inconsistent-return-statements
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def _get_set_or_delete(self, id, operation, new_item=None):
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_check_if_has_indexable_children(self)
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# pylint: disable=access-member-before-definition,
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# pylint: disable=attribute-defined-outside-init
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if isinstance(self.children, Component):
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if getattr(self.children, "id", None) is not None:
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# Woohoo! It's the item that we're looking for
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if self.children.id == id:
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if operation == "get":
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return self.children
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if operation == "set":
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self.children = new_item
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return
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if operation == "delete":
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self.children = None
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return
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# Recursively dig into its subtree
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try:
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if operation == "get":
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return self.children.__getitem__(id)
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if operation == "set":
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self.children.__setitem__(id, new_item)
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return
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if operation == "delete":
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self.children.__delitem__(id)
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return
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except KeyError:
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pass
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# if children is like a list
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if isinstance(self.children, (tuple, MutableSequence)):
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for i, item in enumerate(self.children):
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# If the item itself is the one we're looking for
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if getattr(item, "id", None) == id:
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if operation == "get":
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return item
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if operation == "set":
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self.children[i] = new_item
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return
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if operation == "delete":
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del self.children[i]
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return
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# Otherwise, recursively dig into that item's subtree
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# Make sure it's not like a string
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elif isinstance(item, Component):
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try:
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if operation == "get":
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return item.__getitem__(id)
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if operation == "set":
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item.__setitem__(id, new_item)
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return
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if operation == "delete":
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item.__delitem__(id)
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return
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except KeyError:
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pass
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# The end of our branch
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# If we were in a list, then this exception will get caught
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raise KeyError(id)
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# Magic methods for a mapping interface:
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# - __getitem__
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# - __setitem__
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# - __delitem__
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# - __iter__
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# - __len__
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def __getitem__(self, id): # pylint: disable=redefined-builtin
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"""Recursively find the element with the given ID through the tree of
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children."""
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# A component's children can be undefined, a string, another component,
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# or a list of components.
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return self._get_set_or_delete(id, "get")
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def __setitem__(self, id, item): # pylint: disable=redefined-builtin
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"""Set an element by its ID."""
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return self._get_set_or_delete(id, "set", item)
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def __delitem__(self, id): # pylint: disable=redefined-builtin
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"""Delete items by ID in the tree of children."""
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return self._get_set_or_delete(id, "delete")
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def _traverse(self):
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"""Yield each item in the tree."""
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for t in self._traverse_with_paths():
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yield t[1]
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@staticmethod
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def _id_str(component):
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id_ = stringify_id(getattr(component, "id", ""))
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return id_ and f" (id={id_:s})"
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def _traverse_with_paths(self):
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"""Yield each item with its path in the tree."""
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children = getattr(self, "children", None)
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children_type = type(children).__name__
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children_string = children_type + self._id_str(children)
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# children is just a component
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if isinstance(children, Component):
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yield "[*] " + children_string, children
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# pylint: disable=protected-access
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for p, t in children._traverse_with_paths():
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yield "\n".join(["[*] " + children_string, p]), t
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# children is a list of components
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elif isinstance(children, (tuple, MutableSequence)):
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for idx, i in enumerate(children):
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list_path = f"[{idx:d}] {type(i).__name__:s}{self._id_str(i)}"
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yield list_path, i
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if isinstance(i, Component):
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# pylint: disable=protected-access
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for p, t in i._traverse_with_paths():
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yield "\n".join([list_path, p]), t
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def _traverse_ids(self):
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"""Yield components with IDs in the tree of children."""
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for t in self._traverse():
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if isinstance(t, Component) and getattr(t, "id", None) is not None:
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yield t
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def __iter__(self):
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"""Yield IDs in the tree of children."""
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for t in self._traverse_ids():
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yield t.id
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def __len__(self):
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"""Return the number of items in the tree."""
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# TODO - Should we return the number of items that have IDs
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# or just the number of items?
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# The number of items is more intuitive but returning the number
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# of IDs matches __iter__ better.
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length = 0
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if getattr(self, "children", None) is None:
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length = 0
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elif isinstance(self.children, Component):
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length = 1
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length += len(self.children)
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elif isinstance(self.children, (tuple, MutableSequence)):
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for c in self.children:
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length += 1
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if isinstance(c, Component):
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length += len(c)
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else:
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# string or number
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length = 1
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return length
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def __repr__(self):
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# pylint: disable=no-member
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props_with_values = [
|
||
|
|
c for c in self._prop_names if getattr(self, c, None) is not None
|
||
|
|
] + [
|
||
|
|
c
|
||
|
|
for c in self.__dict__
|
||
|
|
if any(c.startswith(wc_attr) for wc_attr in self._valid_wildcard_attributes)
|
||
|
|
]
|
||
|
|
if any(p != "children" for p in props_with_values):
|
||
|
|
props_string = ", ".join(
|
||
|
|
f"{p}={getattr(self, p)!r}" for p in props_with_values
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
props_string = repr(getattr(self, "children", None))
|
||
|
|
return f"{self._type}({props_string})"
|
||
|
|
|
||
|
|
|
||
|
|
def _explicitize_args(func):
|
||
|
|
# Python 2
|
||
|
|
if hasattr(func, "func_code"):
|
||
|
|
varnames = func.func_code.co_varnames
|
||
|
|
# Python 3
|
||
|
|
else:
|
||
|
|
varnames = func.__code__.co_varnames
|
||
|
|
|
||
|
|
def wrapper(*args, **kwargs):
|
||
|
|
if "_explicit_args" in kwargs:
|
||
|
|
raise Exception("Variable _explicit_args should not be set.")
|
||
|
|
kwargs["_explicit_args"] = list(
|
||
|
|
set(list(varnames[: len(args)]) + [k for k, _ in kwargs.items()])
|
||
|
|
)
|
||
|
|
if "self" in kwargs["_explicit_args"]:
|
||
|
|
kwargs["_explicit_args"].remove("self")
|
||
|
|
return func(*args, **kwargs)
|
||
|
|
|
||
|
|
# If Python 3, we can set the function signature to be correct
|
||
|
|
if hasattr(inspect, "signature"):
|
||
|
|
# pylint: disable=no-member
|
||
|
|
new_sig = inspect.signature(wrapper).replace(
|
||
|
|
parameters=inspect.signature(func).parameters.values()
|
||
|
|
)
|
||
|
|
wrapper.__signature__ = new_sig
|
||
|
|
return wrapper
|