flecs 0.1.5

Rust bindings for the Flecs Entity Component System
Documentation 
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use crate::cache::WorldInfoCache;
use crate::*;

// This is a first attempt at sharing common term building functionality
// between Filters, Queries, and Systems
//
pub trait TermBuilder: Sized {
	fn world(&mut self) -> *mut ecs_world_t;
	fn filter_desc(&mut self) -> &mut ecs_filter_desc_t;
	fn current_term(&mut self) -> &mut ecs_term_t;
	fn next_term(&mut self);

	// This is not working right
	// fn expr(mut self, expr: &str) -> Self {
	// 	let filter = self.filter_desc();
	// 	if expr.len() > 0 {
	// 		let expr_c_str = std::ffi::CString::new(expr).unwrap();
	// 		filter.expr = expr_c_str.as_ptr() as *const i8;
	// 	}
	// 	self
	// }

	fn term<A: Component>(mut self) -> Self {
		let world_raw = self.world();
		let term = self.current_term();

		term.id = WorldInfoCache::get_component_id_for_type::<A>(world_raw)
			.expect("Component type not registered!");

		self.next_term();
		self
	}

	fn without<A: Component>(mut self) -> Self {
		let world_raw = self.world();
		let term = self.current_term();

		term.id = WorldInfoCache::get_component_id_for_type::<A>(world_raw)
			.expect("Component type not registered!");
		term.oper = ecs_oper_kind_t_EcsNot;

		self.next_term();
		self
	}

	fn term_dynamic(mut self, comp_id: EntityId) -> Self {
		// TODO - validate that the comp_id passed is valid
		let term = self.current_term();
		term.id = comp_id;
		self.next_term();
		self
	}

	fn with_components<'c, G: ComponentGroup<'c>>(mut self) -> Self {
		G::populate(&mut self);
		self
	}
}