From 6ed456e3ff303234bfbcbe3408002ff39ab6a782 Mon Sep 17 00:00:00 2001
From: Michael Sippel <micha@fragmental.art>
Date: Sun, 1 Sep 2024 23:21:49 +0200
Subject: [PATCH] add morphisms between machine.UInt64 and PosInt

---
 lib-nested-core/src/editors/integer/ctx.rs | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/lib-nested-core/src/editors/integer/ctx.rs b/lib-nested-core/src/editors/integer/ctx.rs
index dc6aa61..d7df660 100644
--- a/lib-nested-core/src/editors/integer/ctx.rs
+++ b/lib-nested-core/src/editors/integer/ctx.rs
@@ -170,9 +170,52 @@ pub fn init_ctx(ctx: Arc<RwLock<Context>>) {
         }
     );
 
+    let posint_list_morph_from_u64 = GenericReprTreeMorphism::new(
+        Context::parse(&ctx, "ℕ ~ machine.UInt64"),
+        Context::parse(&ctx, "ℕ ~ <PosInt 0 LittleEndian> ~ <Seq~List <Digit 0>~ℤ_2^64~machine.UInt64>"),
+        {
+            let ctx = ctx.clone();
+            move |rt, σ| {
+                let digits = rt
+                    .descend(Context::parse(&ctx, "ℕ ~ machine.UInt64")).unwrap()
+                    .view_u64()
+                    .to_sequence()
+                    .to_list();
+
+                rt.attach_leaf_to(
+                    Context::parse(&ctx, "ℕ ~ <PosInt 0 LittleEndian> ~ <Seq~List <Digit 0>~ℤ_2^64~machine.UInt64>"),
+                    digits
+                );
+            }
+        }
+    );
+    let posint_list_morph_to_u64 = GenericReprTreeMorphism::new(
+        Context::parse(&ctx, "ℕ ~ <PosInt 0 LittleEndian> ~ <Seq~List <Digit 0>~ℤ_2^64~machine.UInt64> ~ <Vec machine.UInt64>"),
+        Context::parse(&ctx, "ℕ ~ machine.UInt64"),
+        {
+            let ctx = ctx.clone();
+            move |rt, σ| {
+                let u64_view = rt
+                    .descend(Context::parse(&ctx, "ℕ ~ <PosInt 0 LittleEndian> ~ <Seq~List <Digit 0>~ℤ_2^64~machine.UInt64> ~ <Vec machine.UInt64>")).unwrap()
+                    .get_port::< RwLock<Vec< u64 >> >().unwrap()
+                    .to_singleton()
+                    .map(|digits| {
+                        digits.get(0).cloned().unwrap_or(0)
+                    });
+
+                rt.attach_leaf_to(
+                    Context::parse(&ctx, "ℕ ~ machine.UInt64"),
+                    u64_view
+                );
+            }
+        }
+    );
+
     ctx.write().unwrap().morphisms.add_morphism( posint_seq_morph_big_to_little );
     ctx.write().unwrap().morphisms.add_morphism( posint_list_morph_big_to_little );
     ctx.write().unwrap().morphisms.add_morphism( posint_list_morph_little_to_big );    
     ctx.write().unwrap().morphisms.add_morphism( posint_list_morph_radix );
+    ctx.write().unwrap().morphisms.add_morphism( posint_list_morph_from_u64 );
+    ctx.write().unwrap().morphisms.add_morphism( posint_list_morph_to_u64 );
 }