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use std::collections::HashMap;
use crate::operations::{normalize_operation, OpKind};
use crate::semantics::NzEnv;
use crate::semantics::{Binder, Closure, Hir, HirKind, Nir, NirKind, TextLit};
use crate::syntax::{ExprKind, InterpolatedTextContents};
pub fn apply_any<'cx>(f: &Nir<'cx>, a: Nir<'cx>) -> NirKind<'cx> {
match f.kind() {
NirKind::LamClosure { closure, .. } => closure.apply(a).kind().clone(),
NirKind::AppliedBuiltin(closure) => closure.apply(a),
NirKind::UnionConstructor(l, kts) => {
NirKind::UnionLit(l.clone(), a, kts.clone())
}
_ => NirKind::Op(OpKind::App(f.clone(), a)),
}
}
pub fn squash_textlit<'cx>(
elts: impl Iterator<Item = InterpolatedTextContents<Nir<'cx>>>,
) -> Vec<InterpolatedTextContents<Nir<'cx>>> {
use std::mem::replace;
use InterpolatedTextContents::{Expr, Text};
fn inner<'cx>(
elts: impl Iterator<Item = InterpolatedTextContents<Nir<'cx>>>,
crnt_str: &mut String,
ret: &mut Vec<InterpolatedTextContents<Nir<'cx>>>,
) {
for contents in elts {
match contents {
Text(s) => crnt_str.push_str(&s),
Expr(e) => match e.kind() {
NirKind::TextLit(elts2) => {
inner(elts2.iter().cloned(), crnt_str, ret)
}
_ => {
if !crnt_str.is_empty() {
ret.push(Text(replace(crnt_str, String::new())))
}
ret.push(Expr(e.clone()))
}
},
}
}
}
let mut crnt_str = String::new();
let mut ret = Vec::new();
inner(elts, &mut crnt_str, &mut ret);
if !crnt_str.is_empty() {
ret.push(Text(replace(&mut crnt_str, String::new())))
}
ret
}
pub fn merge_maps<K, V, F>(
map1: &HashMap<K, V>,
map2: &HashMap<K, V>,
mut f: F,
) -> HashMap<K, V>
where
F: FnMut(&K, &V, &V) -> V,
K: std::hash::Hash + Eq + Clone,
V: Clone,
{
let mut kvs = HashMap::new();
for (x, v2) in map2 {
let newv = if let Some(v1) = map1.get(x) {
// Collision: the key is present in both maps
f(x, v1, v2)
} else {
v2.clone()
};
kvs.insert(x.clone(), newv);
}
for (x, v1) in map1 {
// Insert only if key not already present
kvs.entry(x.clone()).or_insert_with(|| v1.clone());
}
kvs
}
pub type Ret<'cx> = NirKind<'cx>;
pub fn ret_nir<'cx>(x: Nir<'cx>) -> Ret<'cx> {
x.into_kind()
}
pub fn ret_kind<'cx>(x: NirKind<'cx>) -> Ret<'cx> {
x
}
pub fn ret_ref<'cx>(x: &Nir<'cx>) -> Ret<'cx> {
x.kind().clone()
}
pub fn ret_op<'cx>(x: OpKind<Nir<'cx>>) -> Ret<'cx> {
NirKind::Op(x)
}
pub fn normalize_one_layer<'cx>(expr: ExprKind<Nir<'cx>>) -> NirKind<'cx> {
use NirKind::{
Assert, Const, NEListLit, NEOptionalLit, Num, RecordLit, RecordType,
UnionType,
};
match expr {
ExprKind::Var(..)
| ExprKind::Lam(..)
| ExprKind::Pi(..)
| ExprKind::Let(..)
| ExprKind::Builtin(..) => {
unreachable!("This case should have been handled in normalize_hir")
}
ExprKind::Const(c) => ret_kind(Const(c)),
ExprKind::Num(l) => ret_kind(Num(l)),
ExprKind::TextLit(elts) => {
let tlit = TextLit::new(elts.into_iter());
// Simplify bare interpolation
if let Some(v) = tlit.as_single_expr() {
ret_ref(v)
} else {
ret_kind(NirKind::TextLit(tlit))
}
}
ExprKind::SomeLit(e) => ret_kind(NEOptionalLit(e)),
ExprKind::EmptyListLit(t) => {
let arg = match t.kind() {
NirKind::ListType(t) => t.clone(),
_ => panic!("internal type error"),
};
ret_kind(NirKind::EmptyListLit(arg))
}
ExprKind::NEListLit(elts) => {
ret_kind(NEListLit(elts.into_iter().collect()))
}
ExprKind::RecordLit(kvs) => {
ret_kind(RecordLit(kvs.into_iter().collect()))
}
ExprKind::RecordType(kvs) => {
ret_kind(RecordType(kvs.into_iter().collect()))
}
ExprKind::UnionType(kvs) => {
ret_kind(UnionType(kvs.into_iter().collect()))
}
ExprKind::Op(op) => normalize_operation(op),
ExprKind::Annot(x, _) => ret_nir(x),
ExprKind::Assert(x) => ret_kind(Assert(x)),
ExprKind::Import(..) => {
unreachable!("This case should have been handled in resolution")
}
}
}
/// Normalize Hir into WHNF
pub fn normalize_hir<'cx>(env: &NzEnv<'cx>, hir: &Hir<'cx>) -> NirKind<'cx> {
match hir.kind() {
HirKind::MissingVar(..) => unreachable!("ruled out by typechecking"),
HirKind::Var(var) => env.lookup_val(*var),
HirKind::Import(import) => {
let typed = env.cx()[import].unwrap_result();
normalize_hir(env, &typed.hir)
}
HirKind::Expr(ExprKind::Lam(binder, annot, body)) => {
let annot = annot.eval(env);
NirKind::LamClosure {
binder: Binder::new(binder.clone()),
annot,
closure: Closure::new(env, body.clone()),
}
}
HirKind::Expr(ExprKind::Pi(binder, annot, body)) => {
let annot = annot.eval(env);
NirKind::PiClosure {
binder: Binder::new(binder.clone()),
annot,
closure: Closure::new(env, body.clone()),
}
}
HirKind::Expr(ExprKind::Let(_, _, val, body)) => {
let val = val.eval(env);
body.eval(env.insert_value(val, ())).kind().clone()
}
HirKind::Expr(ExprKind::Builtin(b)) => {
NirKind::from_builtin_env(*b, env.clone())
}
HirKind::Expr(e) => {
let e = e.map_ref(|hir| hir.eval(env));
normalize_one_layer(e)
}
}
}
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