git.delta.rocks / jrsonnet / refs/commits / 64fb3950ee00

1use crate::{future_wrapper, rc_fn_helper, LazyBinding, ObjValue, LazyVal, Val};2use std::{cell::RefCell, collections::HashMap, fmt::Debug, rc::Rc};34rc_fn_helper!(5	ContextCreator,6	context_creator,7	dyn Fn(Option<ObjValue>, Option<ObjValue>) -> Context8);910future_wrapper!(Context, FutureContext);1112#[derive(Debug)]13struct ContextInternals {14	dollar: Option<ObjValue>,15	this: Option<ObjValue>,16	super_obj: Option<ObjValue>,17	bindings: Rc<HashMap<String, LazyVal>>,18}19pub struct Context(Rc<ContextInternals>);20impl Debug for Context {21	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {22		f.debug_struct("Context")23			.field("this", &self.0.this.clone().map(|e| Rc::as_ptr(&e.0)))24			.finish()25	}26}27impl Context {28	pub fn new_future() -> FutureContext {29		FutureContext(Rc::new(RefCell::new(None)))30	}3132	pub fn dollar(&self) -> &Option<ObjValue> {33		&self.0.dollar34	}3536	pub fn this(&self) -> &Option<ObjValue> {37		&self.0.this38	}3940	pub fn super_obj(&self) -> &Option<ObjValue> {41		&self.0.super_obj42	}4344	pub fn new() -> Context {45		Context(Rc::new(ContextInternals {46			dollar: None,47			this: None,48			super_obj: None,49			bindings: Rc::new(HashMap::new()),50		}))51	}5253	pub fn binding(&self, name: &str) -> LazyVal {54		self.055			.bindings56			.get(name)57			.cloned()58			.unwrap_or_else(|| {59				panic!("can't find {} in {:?}", name, self);60			})61	}62	pub fn into_future(self, ctx: FutureContext) -> Context {63		{64			ctx.0.borrow_mut().replace(self);65		}66		ctx.unwrap()67	}6869	pub fn extend(70		&self,71		new_bindings: HashMap<String, LazyBinding>,72		new_dollar: Option<ObjValue>,73		new_this: Option<ObjValue>,74		new_super_obj: Option<ObjValue>,75	) -> Context {76		let dollar = new_dollar.or_else(|| self.0.dollar.clone());77		let this = new_this.or_else(|| self.0.this.clone());78		let super_obj = new_super_obj.or_else(|| self.0.super_obj.clone());79		let bindings = if new_bindings.is_empty() {80			self.0.bindings.clone()81		} else {82			let mut new = HashMap::new(); // = self.0.bindings.clone();83			for (k, v) in self.0.bindings.iter() {84				new.insert(k.clone(), v.clone());85			}86			for (k, v) in new_bindings.into_iter() {87				new.insert(k, v.0(this.clone(), super_obj.clone()));88			}89			Rc::new(new)90		};91		Context(Rc::new(ContextInternals {92			dollar,93			this,94			super_obj,95			bindings,96		}))97	}98}99100impl Default for Context {101	fn default() -> Self {102		Self::new()103	}104}105106impl PartialEq for Context {107	fn eq(&self, other: &Self) -> bool {108		Rc::ptr_eq(&self.0, &other.0)109	}110}111112impl Clone for Context {113	fn clone(&self) -> Self {114		Context(self.0.clone())115	}116}