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use std::collections::HashMap;
use crate::ast::hir::{Binding, Decl, Expr};
use crate::ast::{BinaryOperator, Ident, Literal, UnaryOperator};
pub(crate) mod monomorphize;
pub(crate) mod strip_positive_units;
pub(crate) trait Visitor<'a, 'ast, T: 'ast>: Sized + 'a {
type Error;
fn visit_type(&mut self, _type: &mut T) -> Result<(), Self::Error> {
Ok(())
}
fn visit_ident(&mut self, _ident: &mut Ident<'ast>) -> Result<(), Self::Error> {
Ok(())
}
fn visit_literal(&mut self, _literal: &mut Literal<'ast>) -> Result<(), Self::Error> {
Ok(())
}
fn visit_unary_operator(&mut self, _op: &mut UnaryOperator) -> Result<(), Self::Error> {
Ok(())
}
fn visit_binary_operator(&mut self, _op: &mut BinaryOperator) -> Result<(), Self::Error> {
Ok(())
}
fn visit_binding(&mut self, binding: &mut Binding<'ast, T>) -> Result<(), Self::Error> {
self.visit_ident(&mut binding.ident)?;
self.visit_type(&mut binding.type_)?;
self.visit_expr(&mut binding.body)?;
Ok(())
}
fn post_visit_call(
&mut self,
_fun: &mut Expr<'ast, T>,
_type_args: &mut HashMap<Ident<'ast>, T>,
_args: &mut Vec<Expr<'ast, T>>,
) -> Result<(), Self::Error> {
Ok(())
}
fn pre_visit_call(
&mut self,
_fun: &mut Expr<'ast, T>,
_type_args: &mut HashMap<Ident<'ast>, T>,
_args: &mut Vec<Expr<'ast, T>>,
) -> Result<(), Self::Error> {
Ok(())
}
fn pre_visit_expr(&mut self, _expr: &mut Expr<'ast, T>) -> Result<(), Self::Error> {
Ok(())
}
fn visit_expr(&mut self, expr: &mut Expr<'ast, T>) -> Result<(), Self::Error> {
self.pre_visit_expr(expr)?;
match expr {
Expr::Ident(id, t) => {
self.visit_ident(id)?;
self.visit_type(t)?;
}
Expr::Literal(lit, t) => {
self.visit_literal(lit)?;
self.visit_type(t)?;
}
Expr::UnaryOp { op, rhs, type_ } => {
self.visit_unary_operator(op)?;
self.visit_expr(rhs)?;
self.visit_type(type_)?;
}
Expr::BinaryOp {
lhs,
op,
rhs,
type_,
} => {
self.visit_expr(lhs)?;
self.visit_binary_operator(op)?;
self.visit_expr(rhs)?;
self.visit_type(type_)?;
}
Expr::Let {
bindings,
body,
type_,
} => {
for binding in bindings.iter_mut() {
self.visit_binding(binding)?;
}
self.visit_expr(body)?;
self.visit_type(type_)?;
}
Expr::If {
condition,
then,
else_,
type_,
} => {
self.visit_expr(condition)?;
self.visit_expr(then)?;
self.visit_expr(else_)?;
self.visit_type(type_)?;
}
Expr::Fun {
args,
body,
type_args,
type_,
} => {
for (ident, t) in args {
self.visit_ident(ident)?;
self.visit_type(t)?;
}
for ta in type_args {
self.visit_ident(ta)?;
}
self.visit_expr(body)?;
self.visit_type(type_)?;
}
Expr::Call {
fun,
args,
type_args,
type_,
} => {
self.pre_visit_call(fun, type_args, args)?;
self.visit_expr(fun)?;
for arg in args.iter_mut() {
self.visit_expr(arg)?;
}
self.visit_type(type_)?;
self.post_visit_call(fun, type_args, args)?;
}
}
Ok(())
}
fn post_visit_decl(&mut self, decl: &'a Decl<'ast, T>) -> Result<(), Self::Error> {
Ok(())
}
fn post_visit_fun_decl(
&mut self,
_name: &mut Ident<'ast>,
_type_args: &mut Vec<Ident>,
_args: &mut Vec<(Ident, T)>,
_body: &mut Box<Expr<T>>,
_type_: &mut T,
) -> Result<(), Self::Error> {
Ok(())
}
fn visit_decl(&mut self, decl: &'a mut Decl<'ast, T>) -> Result<(), Self::Error> {
match decl {
Decl::Fun {
name,
type_args,
args,
body,
type_,
} => {
self.visit_ident(name)?;
for type_arg in type_args.iter_mut() {
self.visit_ident(type_arg)?;
}
for (arg, t) in args.iter_mut() {
self.visit_ident(arg)?;
self.visit_type(t)?;
}
self.visit_expr(body)?;
self.visit_type(type_)?;
self.post_visit_fun_decl(name, type_args, args, body, type_)?;
}
Decl::Extern {
name,
arg_types,
ret_type,
} => {
self.visit_ident(name)?;
for arg_t in arg_types {
self.visit_type(arg_t)?;
}
self.visit_type(ret_type)?;
}
}
self.post_visit_decl(decl)?;
Ok(())
}
}
|
