feat: Adding list_clone() function

Author: phorward

src/_builtins.rs

@@ -6,7 +6,7 @@
 use crate::builtin::Builtin;
 
 /*GENERATE cargo run -- _builtins.tok -- `find . -name "*.rs"` */
-pub static BUILTINS: [Builtin; 68] = [
+pub static BUILTINS: [Builtin; 69] = [
     Builtin {
         name: "Float",
         func: crate::value::token::tokay_token_float,
@@ -163,6 +163,10 @@ pub static BUILTINS: [Builtin; 68] = [
         name: "list_add",
         func: crate::value::list::List::tokay_method_list_add,
     },
+    Builtin {
+        name: "list_clone",
+        func: crate::value::list::List::tokay_method_list_clone,
+    },
     Builtin {
         name: "list_flatten",
         func: crate::value::list::List::tokay_method_list_flatten,

src/value/list.rs

@@ -50,6 +50,7 @@ impl Object for List {
     }
 }
 
+#[allow(unused_doc_comments)]
 impl List {
     pub fn new() -> Self {
         Self {
@@ -84,6 +85,17 @@ impl List {
         Ok(RefValue::from(list))
     });
 
+    /// Clone `list` into a standalone copy.
+    tokay_method!("list_clone : @list", {
+        let borrowed = list.borrow();
+
+        if let Some(list) = borrowed.object::<List>() {
+            Ok(RefValue::from(list.clone()))
+        } else {
+            Ok(RefValue::from(List { list: vec![list.clone()] }))
+        }
+    });
+
     tokay_method!("list_len : @list", {
         let list = list.borrow();
 

tests/list_clone.tok

@@ -0,0 +1,13 @@
+#testmode:repl
+
+l = 1,2,3
+m = l.clone()
+l += 4
+m += 5, 6, 7
+
+l
+m
+
+#---
+#(1, 2, 3, 4)
+#(1, 2, 3, 5, 6, 7)