gruggers 0.9.0

rust implementation of the grug language
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use crate::backend::Backend;
use crate::types::{FileId, GrugEntity, Value};
use crate::ast::GrugAst;

use gruggers_core::state::State;

/// An empty backend that simply throws away any file given to it.
/// Cannot be used to create entities or call functions.
/// 
/// Will throw if another backend is swapped into this
pub struct StubBackend;

impl Backend for StubBackend {
	fn insert_file(&self, _id: FileId, _file: &GrugAst) { }
	fn init_entity<GrugState: State>(&self, _state: &GrugState, _entity: &GrugEntity) -> bool {
		panic!("Tried to initialize entity with stub backend");
	}
	fn clear_entities(&mut self) { }
	unsafe fn destroy_entity_data(&self, _entity: &GrugEntity) { }
	unsafe fn call_on_function_raw<GrugState: State>(&self, _state: &GrugState, _entity: &GrugEntity, _on_fn_index: usize, _values: *const Value) -> bool {
		panic!("Tried to call export function with stub backend");
	}
	fn call_on_function<GrugState: State>(&self, _state: &GrugState, _entity: &GrugEntity, _on_fn_index: usize, _values: &[Value]) -> bool {
		panic!("Tried to call export function with stub backend");
	}	
	fn raise_runtime_error<GrugState: State>(&self, _state: &GrugState, _message: &str) {
		panic!();
	}
}