1use crate::{2 future_wrapper, rc_fn_helper, resolved_lazy_val, LazyBinding, LazyVal, ObjValue, Result, Val,3};4use std::{cell::RefCell, collections::HashMap, fmt::Debug, rc::Rc};56rc_fn_helper!(7 ContextCreator,8 context_creator,9 dyn Fn(Option<ObjValue>, Option<ObjValue>) -> Result<Context>10);1112future_wrapper!(Context, FutureContext);1314#[derive(Debug)]15struct ContextInternals {16 dollar: Option<ObjValue>,17 this: Option<ObjValue>,18 super_obj: Option<ObjValue>,19 bindings: Rc<HashMap<String, LazyVal>>,20}21pub struct Context(Rc<ContextInternals>);22impl Debug for Context {23 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {24 f.debug_struct("Context")25 .field("this", &self.0.this.clone().map(|e| Rc::as_ptr(&e.0)))26 .finish()27 }28}29impl Context {30 pub fn new_future() -> FutureContext {31 FutureContext(Rc::new(RefCell::new(None)))32 }3334 pub fn dollar(&self) -> &Option<ObjValue> {35 &self.0.dollar36 }3738 pub fn this(&self) -> &Option<ObjValue> {39 &self.0.this40 }4142 pub fn super_obj(&self) -> &Option<ObjValue> {43 &self.0.super_obj44 }4546 pub fn new() -> Context {47 Context(Rc::new(ContextInternals {48 dollar: None,49 this: None,50 super_obj: None,51 bindings: Rc::new(HashMap::new()),52 }))53 }5455 pub fn binding(&self, name: &str) -> LazyVal {56 self.0.bindings.get(name).cloned().unwrap_or_else(|| {57 panic!("can't find {} in {:?}", name, self);58 })59 }60 pub fn into_future(self, ctx: FutureContext) -> Context {61 {62 ctx.0.borrow_mut().replace(self);63 }64 ctx.unwrap()65 }6667 pub fn with_var(&self, name: String, value: Val) -> Result<Context> {68 let mut new_bindings: HashMap<_, LazyBinding> = HashMap::new();69 new_bindings.insert(name, LazyBinding::Bound(resolved_lazy_val!(value.clone())));70 self.extend(new_bindings, None, None, None)71 }7273 pub fn extend(74 &self,75 new_bindings: HashMap<String, LazyBinding>,76 new_dollar: Option<ObjValue>,77 new_this: Option<ObjValue>,78 new_super_obj: Option<ObjValue>,79 ) -> Result<Context> {80 let dollar = new_dollar.or_else(|| self.0.dollar.clone());81 let this = new_this.or_else(|| self.0.this.clone());82 let super_obj = new_super_obj.or_else(|| self.0.super_obj.clone());83 let bindings = if new_bindings.is_empty() {84 self.0.bindings.clone()85 } else {86 let mut new = HashMap::new(); 87 for (k, v) in self.0.bindings.iter() {88 new.insert(k.clone(), v.clone());89 }90 for (k, v) in new_bindings.into_iter() {91 new.insert(k, v.evaluate(this.clone(), super_obj.clone())?);92 }93 Rc::new(new)94 };95 Ok(Context(Rc::new(ContextInternals {96 dollar,97 this,98 super_obj,99 bindings,100 })))101 }102}103104impl Default for Context {105 fn default() -> Self {106 Self::new()107 }108}109110impl PartialEq for Context {111 fn eq(&self, other: &Self) -> bool {112 Rc::ptr_eq(&self.0, &other.0)113 }114}115116impl Clone for Context {117 fn clone(&self) -> Self {118 Context(self.0.clone())119 }120}