beet_dom 0.0.8

Utilities for dom rendering and interaction
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use crate::prelude::*;
use beet_core::prelude::*;

/// Specify types for variadic functions like TokenizeComponent
pub type RsxDirectives = (SlotChild, SlotTarget);

/// Directive indicating a node should be moved to the slot with the given name.
/// All nodes without this directive are moved to the default slot.
#[derive(Debug, Default, Clone, PartialEq, Eq, Component, Reflect)]
#[reflect(Component)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[cfg_attr(feature = "tokens", derive(ToTokens))]
pub enum SlotChild {
	/// Default slot indicated by the `slot="default"`, or `slot` attribute without a value.
	#[default]
	Default,
	/// Named slot indicated by the `slot="name"` attribute.
	Named(String),
}

impl TemplateDirective for SlotChild {
	fn try_from_attribute(key: &str, value: Option<&TextNode>) -> Option<Self> {
		match (key, value) {
			("slot", Some(value)) if value.as_str() == "default" => {
				Some(Self::Default)
			}
			("slot", Some(value)) => Some(Self::Named(value.to_string())),
			("slot", None) => Some(Self::Default),
			_ => None,
		}
	}
}



/// The target for slots, defined with a tag `<slot>` or <slot name="foo">`.
/// This directive is unique as its defined by the tag name, not an attribute.
#[derive(Debug, Default, Clone, PartialEq, Eq, Component, Reflect)]
#[reflect(Component)]
#[require(FragmentNode)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[cfg_attr(feature = "tokens", derive(ToTokens))]
pub enum SlotTarget {
	#[default]
	Default,
	Named(String),
}

impl SlotTarget {
	pub fn named(name: impl Into<String>) -> Self {
		SlotTarget::Named(name.into())
	}

	/// Returns the name of the slot target, or `None` if it's the default slot.
	pub fn name(&self) -> Option<&str> {
		match self {
			SlotTarget::Default => None,
			SlotTarget::Named(name) => Some(name),
		}
	}
}

/// convert all nodes with the `slot` tag into a `SlotTarget`,
/// this does not address slot children, ie `<div slot="foo">`
pub fn extract_slot_targets(
	mut commands: Commands,
	query: Populated<(Entity, &NodeTag), Added<ElementNode>>,
	attributes: FindAttribute,
) {
	for (node_ent, node_tag) in query.iter() {
		if **node_tag != "slot" {
			continue;
		}
		let target = attributes
			.find(node_ent, "name")
			.map(|(entity, value)| {
				commands.entity(entity).despawn();
				if let Some(value) = value.as_ref() {
					SlotTarget::Named(value.0.clone())
				} else {
					SlotTarget::Default
				}
			})
			.unwrap_or(SlotTarget::Default);

		commands
			.entity(node_ent)
			.remove::<NodeTag>()
			.remove::<ElementNode>()
			// requires fragment
			.insert(target);
	}
}



#[cfg(test)]
mod test {
	use crate::prelude::*;
	use beet_core::prelude::*;
	use bevy::ecs::system::RunSystemOnce;

	#[test]
	fn default_slot_target() {
		let mut app = App::new();
		let entity = app
			.world_mut()
			.spawn((ElementNode::self_closing(), NodeTag("slot".to_string())))
			.id();
		app.world_mut()
			.run_system_once(extract_slot_targets)
			.unwrap();

		app.world_mut()
			.entity(entity)
			.get::<SlotTarget>()
			.xpect_eq(Some(&SlotTarget::default()));
	}
	#[test]
	fn named_slot_target() {
		let mut app = App::new();
		let entity = app
			.world_mut()
			.spawn((
				ElementNode::self_closing(),
				NodeTag("slot".to_string()),
				related!(
					Attributes
						[(AttributeKey::new("name"), "foo".into_bundle())]
				),
			))
			.id();
		app.world_mut()
			.run_system_once(extract_slot_targets)
			.unwrap();

		app.world_mut()
			.entity(entity)
			.get::<SlotTarget>()
			.xpect_eq(Some(&SlotTarget::Named("foo".to_string())));
	}
}