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use std::{collections::HashMap, ops::Deref};
use rebel_parse::ast::{self, expr};
use crate::{
func::Func,
typing::{self, Type, TypeError, TypeFamily},
value::{self, EvalError, Value},
};
#[derive(Debug, Clone)]
pub struct Var {
pub explicit_type: Type,
pub inferred_type: Type,
pub value: Option<Value>,
}
#[derive(Debug, Clone, Default)]
pub struct Context {
pub vars: Module<Var>,
pub methods: HashMap<TypeFamily, HashMap<&'static str, Func>>,
}
impl Context {
pub fn record_type(&mut self, stmt: &ast::BodyStmt) -> typing::Result<Type> {
match stmt {
ast::BodyStmt::Assign { dest, expr } => {
let typ = Type::ast_expr_type(self, expr)?;
// TODO: Handle explicit type
let ast::TypedExpr {
expr: dest_expr,
typ: _,
} = dest.deref();
// TODO: Handle other assignable expressions
let dest_path = match dest_expr {
expr::Expr::Path(path) => path,
_ => return Err(TypeError),
};
let [dest_ident] = dest_path.components[..] else {
return Err(TypeError);
};
// TODO: Lexical scoping
self.vars.0.insert(
dest_ident.name.to_owned(),
ModuleEntry::Def(Var {
explicit_type: Type::Free,
inferred_type: typ.clone(),
value: None,
}),
);
Ok(typ)
}
ast::BodyStmt::Expr { expr } => Type::ast_expr_type(self, expr),
ast::BodyStmt::Empty => Ok(Type::Unit),
}
}
pub fn execute(&mut self, stmt: &ast::BodyStmt) -> value::Result<Value> {
match stmt {
ast::BodyStmt::Assign { dest, expr } => {
let value = Value::eval(self, expr)?;
let typ = value.typ().or(Err(EvalError))?;
// TODO: Handle explicit type
let ast::TypedExpr {
expr: dest_expr,
typ: _,
} = dest.deref();
// TODO: Handle other assignable expressions
let dest_path = match dest_expr {
expr::Expr::Path(path) => path,
_ => return Err(EvalError),
};
let [dest_ident] = dest_path.components[..] else {
return Err(EvalError);
};
// TODO: Lexical scoping
self.vars.0.insert(
dest_ident.name.to_owned(),
ModuleEntry::Def(Var {
explicit_type: Type::Free,
inferred_type: typ,
value: Some(value.clone()),
}),
);
Ok(value)
}
ast::BodyStmt::Expr { expr } => Value::eval(self, expr),
ast::BodyStmt::Empty => Ok(Value::Unit),
}
}
}
#[derive(Debug, Clone)]
pub struct Module<T>(pub HashMap<String, ModuleEntry<T>>);
impl<T> Module<T> {
pub fn lookup(&self, path: &[ast::Ident<'_>]) -> Option<&T> {
let (ident, rest) = path.split_first()?;
match self.0.get(ident.name)? {
ModuleEntry::Module(module) => module.lookup(rest),
ModuleEntry::Def(def) => {
if rest.is_empty() {
Some(def)
} else {
None
}
}
}
}
}
impl<T> Default for Module<T> {
fn default() -> Self {
Self(HashMap::new())
}
}
#[derive(Debug, Clone)]
pub enum ModuleEntry<T> {
Module(Module<T>),
Def(T),
}
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