From 82bf14785b0133808c9192dd03b6e1c185cb9c0d Mon Sep 17 00:00:00 2001
From: David Mak <chmakac@connect.ust.hk>
Date: Tue, 4 Jun 2024 18:00:42 +0800
Subject: [PATCH] core: Add multidimensional array helpers

---
 nac3core/src/toplevel/helper.rs | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/nac3core/src/toplevel/helper.rs b/nac3core/src/toplevel/helper.rs
index e212ac8b..fdef020a 100644
--- a/nac3core/src/toplevel/helper.rs
+++ b/nac3core/src/toplevel/helper.rs
@@ -1,6 +1,7 @@
 use std::convert::TryInto;
 
 use crate::symbol_resolver::SymbolValue;
+use crate::toplevel::numpy::unpack_ndarray_var_tys;
 use crate::typecheck::typedef::{Mapping, VarMap};
 use nac3parser::ast::{Constant, Location};
 
@@ -691,3 +692,35 @@ pub fn parse_parameter_default_value(
         ]))
     }
 }
+
+/// Obtains the element type of an array-like type.
+pub fn arraylike_flatten_element_type(unifier: &mut Unifier, ty: Type) -> Type {
+    match &*unifier.get_ty(ty) {
+        TypeEnum::TObj { obj_id, .. } if *obj_id == PRIMITIVE_DEF_IDS.ndarray => 
+            unpack_ndarray_var_tys(unifier, ty).0,
+
+        TypeEnum::TList { ty } => arraylike_flatten_element_type(unifier, *ty),
+        _ => ty
+    }
+}
+
+/// Obtains the number of dimensions of an array-like type.
+pub fn arraylike_get_ndims(unifier: &mut Unifier, ty: Type) -> u64 {
+    match &*unifier.get_ty(ty) {
+        TypeEnum::TObj { obj_id, .. } if *obj_id == PRIMITIVE_DEF_IDS.ndarray => {
+            let ndims = unpack_ndarray_var_tys(unifier, ty).1;
+            let TypeEnum::TLiteral { values, .. } = &*unifier.get_ty_immutable(ndims) else {
+                panic!("Expected TLiteral for ndarray.ndims, got {}", unifier.stringify(ndims))
+            };
+
+            if values.len() > 1 {
+                todo!("Getting num of dimensions for ndarray with more than one ndim bound is unimplemented")
+            }
+
+            u64::try_from(values[0].clone()).unwrap()
+        }
+
+        TypeEnum::TList { ty } => arraylike_get_ndims(unifier, *ty) + 1,
+        _ => 0
+    }
+}