Merge branch 'bug-fixes'

CHANGELOG.md

@@ -59,6 +59,10 @@ Enhancements
 * `StaticVec` is changed to keep three items inline instead of four.
 
 
+Version 1.0.7
+=============
+
+
 Version 1.0.6
 =============
 
@@ -66,6 +70,7 @@ Bug fixes
 ---------
 
 * Eliminate unnecessary property write-back when accessed via a getter since property getters are assumed to be _pure_.
+* Writing to a property of an indexed valued obtained via an indexer now works properly by writing back the changed value via an index setter.
 
 Enhancements
 ------------

src/engine.rs

@@ -336,6 +336,20 @@ impl ChainArgument {
             _ => None,
         }
     }
+    /// Return the [position][Position].
+    #[inline(always)]
+    #[must_use]
+    #[allow(dead_code)]
+    pub const fn position(&self) -> Position {
+        match self {
+            #[cfg(not(feature = "no_object"))]
+            ChainArgument::Property(pos) => *pos,
+            #[cfg(not(feature = "no_object"))]
+            ChainArgument::MethodCallArgs(_, pos) => *pos,
+            #[cfg(not(feature = "no_index"))]
+            ChainArgument::IndexValue(_, pos) => *pos,
+        }
+    }
 }
 
 #[cfg(not(feature = "no_object"))]
@@ -1279,6 +1293,7 @@ impl Engine {
             #[cfg(not(feature = "no_index"))]
             ChainType::Indexing => {
                 let pos = rhs.position();
+                let root_pos = idx_val.position();
                 let idx_val = idx_val
                     .into_index_value()
                     .expect("`chain_type` is `ChainType::Index`");
@@ -1288,17 +1303,50 @@ impl Engine {
                     Expr::Dot(x, term, x_pos) | Expr::Index(x, term, x_pos)
                         if !_terminate_chaining =>
                     {
+                        let mut idx_val_for_setter = idx_val.clone();
                         let idx_pos = x.lhs.position();
-                        let obj_ptr = &mut self.get_indexed_mut(
+                        let rhs_chain = match_chaining_type(rhs);
+
+                        let (try_setter, result) = {
+                            let mut obj = self.get_indexed_mut(
                                 mods, state, lib, target, idx_val, idx_pos, false, true, level,
                             )?;
+                            let is_obj_temp_val = obj.is_temp_value();
+                            let obj_ptr = &mut obj;
 
-                        let rhs_chain = match_chaining_type(rhs);
+                            match self.eval_dot_index_chain_helper(
-                        self.eval_dot_index_chain_helper(
+                                mods, state, lib, this_ptr, obj_ptr, root, &x.rhs, *term,
-                            mods, state, lib, this_ptr, obj_ptr, root, &x.rhs, *term, idx_values,
+                                idx_values, rhs_chain, level, new_val,
-                            rhs_chain, level, new_val,
+                            ) {
-                        )
+                                Ok((result, true)) if is_obj_temp_val => {
-                        .map_err(|err| err.fill_position(*x_pos))
+                                    (Some(obj.take_or_clone()), (result, true))
+                                }
+                                Ok(result) => (None, result),
+                                Err(err) => return Err(err.fill_position(*x_pos)),
+                            }
+                        };
+
+                        if let Some(mut new_val) = try_setter {
+                            // Try to call index setter if value is changed
+                            let hash_set =
+                                FnCallHashes::from_native(self.constants.fn_hash_idx_set);
+                            let args = &mut [target, &mut idx_val_for_setter, &mut new_val];
+
+                            if let Err(err) = self.exec_fn_call(
+                                mods, state, lib, FN_IDX_SET, hash_set, args, is_ref_mut, true,
+                                root_pos, None, level,
+                            ) {
+                                // Just ignore if there is no index setter
+                                if !matches!(*err, EvalAltResult::ErrorFunctionNotFound(_, _)) {
+                                    return Err(err);
+                                }
+                            }
+                        }
+
+                        self.check_data_size(target.as_ref())
+                            .map_err(|err| err.fill_position(root.1))?;
+
+                        Ok(result)
                     }
                     // xxx[rhs] op= new_val
                     _ if new_val.is_some() => {
@@ -1331,11 +1379,10 @@ impl Engine {
                             let hash_set =
                                 FnCallHashes::from_native(self.constants.fn_hash_idx_set);
                             let args = &mut [target, &mut idx_val_for_setter, &mut new_val];
-                            let pos = Position::NONE;
 
                             self.exec_fn_call(
                                 mods, state, lib, FN_IDX_SET, hash_set, args, is_ref_mut, true,
-                                pos, None, level,
+                                root_pos, None, level,
                             )?;
                         }
 
@@ -2368,7 +2415,7 @@ impl Engine {
                 let args = &mut [lhs_ptr_inner, &mut new_val];
 
                 match self.call_native_fn(mods, state, lib, op, hash, args, true, true, op_pos) {
-                    Err(err) if matches!(err.as_ref(), EvalAltResult::ErrorFunctionNotFound(f, _) if f.starts_with(op)) =>
+                    Err(err) if matches!(*err, EvalAltResult::ErrorFunctionNotFound(ref f, _) if f.starts_with(op)) =>
                     {
                         // Expand to `var = var op rhs`
                         let op = &op[..op.len() - 1]; // extract operator without =

tests/get_set.rs

@@ -119,7 +119,17 @@ fn test_get_set_chain_with_write_back() -> Result<(), Box<EvalAltResult>> {
     engine.register_get_set("x", TestChild::get_x, TestChild::set_x);
     engine.register_get_set("child", TestParent::get_child, TestParent::set_child);
 
+    #[cfg(not(feature = "no_index"))]
+    engine.register_indexer_get_set(
+        |parent: &mut TestParent, _: INT| parent.child.clone(),
+        |parent: &mut TestParent, n: INT, mut new_child: TestChild| {
+            new_child.x *= n;
+            parent.child = new_child;
+        },
+    );
+
     engine.register_fn("new_tp", TestParent::new);
+    engine.register_fn("new_tc", TestChild::new);
 
     assert_eq!(engine.eval::<INT>("let a = new_tp(); a.child.x")?, 1);
     assert_eq!(
@@ -132,6 +142,18 @@ fn test_get_set_chain_with_write_back() -> Result<(), Box<EvalAltResult>> {
         "TestParent"
     );
 
+    #[cfg(not(feature = "no_index"))]
+    assert_eq!(
+        engine.eval::<INT>("let a = new_tp(); let c = new_tc(); c.x = 123; a[2] = c; a.child.x")?,
+        246
+    );
+
+    #[cfg(not(feature = "no_index"))]
+    assert_eq!(
+        engine.eval::<INT>("let a = new_tp(); a[2].x = 42; a.child.x")?,
+        84
+    );
+
     Ok(())
 }
 
@@ -204,11 +226,31 @@ fn test_get_set_chain_without_write_back() -> Result<(), Box<EvalAltResult>> {
             |_: &mut Outer, new: Inner| panic!("Outer::inner setter called with {:?}", new),
         );
 
+    #[cfg(not(feature = "no_index"))]
+    engine.register_indexer_get_set(
+        |t: &mut Outer, n: INT| Inner {
+            value: t.inner.value * n,
+        },
+        |_: &mut Outer, n: INT, new: Inner| {
+            panic!("Outer::inner index setter called with {} and {:?}", n, new)
+        },
+    );
+
     assert_eq!(
         engine.eval_with_scope::<INT>(&mut scope, "outer.inner.value")?,
         42
     );
+
+    #[cfg(not(feature = "no_index"))]
+    assert_eq!(
+        engine.eval_with_scope::<INT>(&mut scope, "outer[2].value")?,
+        84
+    );
+
     engine.run_with_scope(&mut scope, "print(outer.inner.value)")?;
 
+    #[cfg(not(feature = "no_index"))]
+    engine.run_with_scope(&mut scope, "print(outer[0].value)")?;
+
     Ok(())
 }