1use crate::{2 future_wrapper, map::LayeredHashMap, rc_fn_helper, resolved_lazy_val, LazyBinding, LazyVal,3 ObjValue, Result, Val,4};5use std::{cell::RefCell, collections::HashMap, fmt::Debug, rc::Rc};67rc_fn_helper!(8 ContextCreator,9 context_creator,10 dyn Fn(Option<ObjValue>, Option<ObjValue>) -> Result<Context>11);1213future_wrapper!(Context, FutureContext);1415struct ContextInternals {16 dollar: Option<ObjValue>,17 this: Option<ObjValue>,18 super_obj: Option<ObjValue>,19 bindings: LayeredHashMap<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: LayeredHashMap::default(),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::new();69 new_bindings.insert(name, resolved_lazy_val!(value));70 self.extend(new_bindings, None, None, None)71 }7273 pub fn extend(74 &self,75 new_bindings: HashMap<String, LazyVal>,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 self.0.bindings.extend(new_bindings)87 };88 Ok(Context(Rc::new(ContextInternals {89 dollar,90 this,91 super_obj,92 bindings,93 })))94 }95 pub fn extend_unbound(96 &self,97 new_bindings: HashMap<String, LazyBinding>,98 new_dollar: Option<ObjValue>,99 new_this: Option<ObjValue>,100 new_super_obj: Option<ObjValue>,101 ) -> Result<Context> {102 let this = new_this.or_else(|| self.0.this.clone());103 let super_obj = new_super_obj.or_else(|| self.0.super_obj.clone());104 let mut new = HashMap::new();105 for (k, v) in new_bindings.into_iter() {106 new.insert(k, v.evaluate(this.clone(), super_obj.clone())?);107 }108 self.extend(new, new_dollar, this, super_obj)109 }110}111112impl Default for Context {113 fn default() -> Self {114 Self::new()115 }116}117118impl PartialEq for Context {119 fn eq(&self, other: &Self) -> bool {120 Rc::ptr_eq(&self.0, &other.0)121 }122}123124impl Clone for Context {125 fn clone(&self) -> Self {126 Context(self.0.clone())127 }128}