99 lines
3.2 KiB
Python
99 lines
3.2 KiB
Python
"""Create a list of components from an iterable."""
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from __future__ import annotations
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from typing import Any, Callable, Dict, List, Set, Tuple, Union
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from pynecone.components.component import Component
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from pynecone.components.layout.fragment import Fragment
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from pynecone.components.tags import IterTag
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from pynecone.vars import BaseVar, Var, get_unique_variable_name
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class Foreach(Component):
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"""A component that takes in an iterable and a render function and renders a list of components."""
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# The iterable to create components from.
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iterable: Var[Union[List, Dict, Tuple, Set]]
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# A function from the render args to the component.
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render_fn: Callable = Fragment.create
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@classmethod
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def create(
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cls, iterable: Var[Union[List, Dict, Tuple, Set]], render_fn: Callable, **props
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) -> Foreach:
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"""Create a foreach component.
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Args:
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iterable: The iterable to create components from.
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render_fn: A function from the render args to the component.
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**props: The attributes to pass to each child component.
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Returns:
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The foreach component.
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Raises:
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TypeError: If the iterable is of type Any.
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"""
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try:
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type_ = (
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iterable.type_
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if iterable.type_.mro()[0] == dict
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else iterable.type_.__args__[0]
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)
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except Exception:
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type_ = Any
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iterable = Var.create(iterable) # type: ignore
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if iterable.type_ == Any:
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raise TypeError(
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f"Could not foreach over var of type Any. (If you are trying to foreach over a state var, add a type annotation to the var.)"
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)
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arg = BaseVar(name="_", type_=type_, is_local=True)
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return cls(
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iterable=iterable,
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render_fn=render_fn,
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children=[IterTag.render_component(render_fn, arg=arg)],
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**props,
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)
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def _render(self) -> IterTag:
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return IterTag(iterable=self.iterable, render_fn=self.render_fn)
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def render(self):
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"""Render the component.
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Returns:
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The dictionary for template of component.
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"""
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tag = self._render()
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try:
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type_ = (
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self.iterable.type_
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if self.iterable.type_.mro()[0] == dict
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else self.iterable.type_.__args__[0]
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)
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except Exception:
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type_ = Any
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arg = BaseVar(
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name=get_unique_variable_name(),
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type_=type_,
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)
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index_arg = tag.get_index_var_arg()
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component = tag.render_component(self.render_fn, arg)
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return dict(
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tag.add_props(
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**self.event_triggers,
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key=self.key,
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sx=self.style,
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id=self.id,
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class_name=self.class_name,
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).set(
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children=[component.render()],
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props=tag.format_props(),
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),
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iterable_state=tag.iterable.full_name,
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arg_name=arg.name,
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arg_index=index_arg,
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iterable_type=tag.iterable.type_.mro()[0].__name__,
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)
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