initial commit: hsmc v0.2 with during: activities

Hierarchical statechart codegen for Rust with:
- during: activities for state-scoped concurrent I/O
- field-list borrowing (split-borrow inside the run loop)
- embassy-first async with tokio support
- STATE_CHART const for tooling/inspection
- examples: microwave, microwave_tui, embassy_full, during_radio

hsmc-macros/tests/ui/t10_1_during_duplicate_field.rs

@@ -0,0 +1,28 @@
+//! t10.1: a single `during:` listing the same field twice is a compile error.
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { Halt }
+
+pub struct Ctx {
+    pub a: u32,
+}
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(S);
+    terminate(Halt);
+
+    state S {
+        during: tick(a, a);
+    }
+}
+}
+
+async fn tick(_: &mut u32, _: &mut u32) -> Ev { Ev::Halt }
+
+impl MActions for MActionContext<'_> {}
+
+fn main() {}

hsmc-macros/tests/ui/t10_1_during_duplicate_field.stderr

@@ -0,0 +1,17 @@
+error: field `a` listed twice in `during: tick(...)` — each field can only be borrowed once per during
+  --> tests/ui/t10_1_during_duplicate_field.rs:19:25
+   |
+19 |         during: tick(a, a);
+   |                         ^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t10_1_during_duplicate_field.rs:26:6
+   |
+26 | impl MActions for MActionContext<'_> {}
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t10_1_during_duplicate_field.rs:26:19
+   |
+26 | impl MActions for MActionContext<'_> {}
+   |                   ^^^^^^^^^^^^^^ not found in this scope

hsmc-macros/tests/ui/t10_2_during_overlap_same_state.rs

@@ -0,0 +1,31 @@
+//! t10.2: two `during:` declarations on the same state borrowing the same
+//! field produce a clear macro-level error.
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { Halt }
+
+pub struct Ctx {
+    pub a: u32,
+}
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(S);
+    terminate(Halt);
+
+    state S {
+        during: one(a);
+        during: two(a);
+    }
+}
+}
+
+async fn one(_: &mut u32) -> Ev { Ev::Halt }
+async fn two(_: &mut u32) -> Ev { Ev::Halt }
+
+impl MActions for MActionContext<'_> {}
+
+fn main() {}

hsmc-macros/tests/ui/t10_2_during_overlap_same_state.stderr

@@ -0,0 +1,17 @@
+error: field `a` is borrowed by two concurrent durings on state `S` (`one` and `two`) — move one of them to a disjoint field or combine the activities into a single during that uses `select`
+  --> tests/ui/t10_2_during_overlap_same_state.rs:21:21
+   |
+21 |         during: two(a);
+   |                     ^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t10_2_during_overlap_same_state.rs:29:6
+   |
+29 | impl MActions for MActionContext<'_> {}
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t10_2_during_overlap_same_state.rs:29:19
+   |
+29 | impl MActions for MActionContext<'_> {}
+   |                   ^^^^^^^^^^^^^^ not found in this scope

hsmc-macros/tests/ui/t9_1_duplicate_transition.rs

@@ -0,0 +1,26 @@
+use hsmc::{statechart, Duration};
+
+#[derive(Debug, Clone)]
+pub enum Ev { Go }
+
+pub struct Ctx;
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(Red);
+    state Red {
+        on(Go) => Green;
+        on(Go) => Yellow;
+    }
+    state Green { entry: e; }
+    state Yellow { entry: e; }
+}
+}
+
+impl MActions for MActionContext<'_> {
+    fn e(&mut self) {}
+}
+
+fn main() {}

hsmc-macros/tests/ui/t9_1_duplicate_transition.stderr

@@ -0,0 +1,25 @@
+error: duplicate transition on trigger `Go` in state `Red`
+  --> tests/ui/t9_1_duplicate_transition.rs:15:12
+   |
+15 |         on(Go) => Yellow;
+   |            ^^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t9_1_duplicate_transition.rs:22:6
+   |
+22 | impl MActions for MActionContext<'_> {
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t9_1_duplicate_transition.rs:22:19
+   |
+22 | impl MActions for MActionContext<'_> {
+   |                   ^^^^^^^^^^^^^^ not found in this scope
+
+warning: unused import: `Duration`
+ --> tests/ui/t9_1_duplicate_transition.rs:1:24
+  |
+1 | use hsmc::{statechart, Duration};
+  |                        ^^^^^^^^
+  |
+  = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default

hsmc-macros/tests/ui/t9_2_missing_default.rs

@@ -0,0 +1,24 @@
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { _U }
+
+pub struct Ctx;
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(Parent);
+    state Parent {
+        state ChildA { entry: e; }
+        state ChildB { entry: e; }
+    }
+}
+}
+
+impl MActions for MActionContext<'_> {
+    fn e(&mut self) {}
+}
+
+fn main() {}

hsmc-macros/tests/ui/t9_2_missing_default.stderr

@@ -0,0 +1,17 @@
+error: state `Parent` has children but no `default` declaration
+  --> tests/ui/t9_2_missing_default.rs:13:11
+   |
+13 |     state Parent {
+   |           ^^^^^^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t9_2_missing_default.rs:20:6
+   |
+20 | impl MActions for MActionContext<'_> {
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t9_2_missing_default.rs:20:19
+   |
+20 | impl MActions for MActionContext<'_> {
+   |                   ^^^^^^^^^^^^^^ not found in this scope

hsmc-macros/tests/ui/t9_3_terminate_in_child.rs

@@ -0,0 +1,24 @@
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { Halt }
+
+pub struct Ctx;
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(Child);
+    state Child {
+        terminate(Halt);
+        entry: e;
+    }
+}
+}
+
+impl MActions for MActionContext<'_> {
+    fn e(&mut self) {}
+}
+
+fn main() {}

hsmc-macros/tests/ui/t9_3_terminate_in_child.stderr

@@ -0,0 +1,17 @@
+error: `terminate` is only valid at the root level
+  --> tests/ui/t9_3_terminate_in_child.rs:14:9
+   |
+14 |         terminate(Halt);
+   |         ^^^^^^^^^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t9_3_terminate_in_child.rs:20:6
+   |
+20 | impl MActions for MActionContext<'_> {
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t9_3_terminate_in_child.rs:20:19
+   |
+20 | impl MActions for MActionContext<'_> {
+   |                   ^^^^^^^^^^^^^^ not found in this scope

hsmc-macros/tests/ui/t9_4_default_non_child.rs

@@ -0,0 +1,25 @@
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { _U }
+
+pub struct Ctx;
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(Parent);
+    state Parent {
+        default(Cousin);
+        state Child { entry: e; }
+    }
+    state Cousin { entry: e; }
+}
+}
+
+impl MActions for MActionContext<'_> {
+    fn e(&mut self) {}
+}
+
+fn main() {}

hsmc-macros/tests/ui/t9_4_default_non_child.stderr

@@ -0,0 +1,17 @@
+error: `default(Cousin)` in state `Parent`: `Cousin` is not a direct child of `Parent`
+  --> tests/ui/t9_4_default_non_child.rs:14:9
+   |
+14 |         default(Cousin);
+   |         ^^^^^^^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t9_4_default_non_child.rs:21:6
+   |
+21 | impl MActions for MActionContext<'_> {
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t9_4_default_non_child.rs:21:19
+   |
+21 | impl MActions for MActionContext<'_> {
+   |                   ^^^^^^^^^^^^^^ not found in this scope

hsmc-macros/tests/ui/t9_5_default_childless.rs

@@ -0,0 +1,24 @@
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { _U }
+
+pub struct Ctx;
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(Leaf);
+    state Leaf {
+        default(Ghost);
+        entry: e;
+    }
+}
+}
+
+impl MActions for MActionContext<'_> {
+    fn e(&mut self) {}
+}
+
+fn main() {}

hsmc-macros/tests/ui/t9_5_default_childless.stderr

@@ -0,0 +1,17 @@
+error: `default` in state `Leaf` which has no child states
+  --> tests/ui/t9_5_default_childless.rs:14:9
+   |
+14 |         default(Ghost);
+   |         ^^^^^^^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t9_5_default_childless.rs:20:6
+   |
+20 | impl MActions for MActionContext<'_> {
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t9_5_default_childless.rs:20:19
+   |
+20 | impl MActions for MActionContext<'_> {
+   |                   ^^^^^^^^^^^^^^ not found in this scope

hsmc-macros/tests/ui/t9_6_empty_state.rs

@@ -0,0 +1,22 @@
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { _U }
+
+pub struct Ctx;
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(A);
+    state A { entry: e; }
+    state Empty {}
+}
+}
+
+impl MActions for MActionContext<'_> {
+    fn e(&mut self) {}
+}
+
+fn main() {}

hsmc-macros/tests/ui/t9_6_empty_state.stderr

@@ -0,0 +1,17 @@
+error: empty state `Empty`
+  --> tests/ui/t9_6_empty_state.rs:14:11
+   |
+14 |     state Empty {}
+   |           ^^^^^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t9_6_empty_state.rs:18:6
+   |
+18 | impl MActions for MActionContext<'_> {
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t9_6_empty_state.rs:18:19
+   |
+18 | impl MActions for MActionContext<'_> {
+   |                   ^^^^^^^^^^^^^^ not found in this scope

hsmc-macros/tests/ui/t9_7_duplicate_default.rs

@@ -0,0 +1,26 @@
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { _U }
+
+pub struct Ctx;
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(Parent);
+    state Parent {
+        default(A);
+        default(B);
+        state A { entry: e; }
+        state B { entry: e; }
+    }
+}
+}
+
+impl MActions for MActionContext<'_> {
+    fn e(&mut self) {}
+}
+
+fn main() {}

hsmc-macros/tests/ui/t9_7_duplicate_default.stderr

@@ -0,0 +1,17 @@
+error: multiple `default` declarations in state `Parent`
+  --> tests/ui/t9_7_duplicate_default.rs:14:9
+   |
+14 |         default(A);
+   |         ^^^^^^^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t9_7_duplicate_default.rs:22:6
+   |
+22 | impl MActions for MActionContext<'_> {
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t9_7_duplicate_default.rs:22:19
+   |
+22 | impl MActions for MActionContext<'_> {
+   |                   ^^^^^^^^^^^^^^ not found in this scope

hsmc-macros/tests/ui/t9_8_unknown_target.rs

@@ -0,0 +1,21 @@
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { Go }
+
+pub struct Ctx;
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(A);
+    state A {
+        on(Go) => NonExistent;
+    }
+}
+}
+
+impl MActions for MActionContext<'_> {}
+
+fn main() {}

hsmc-macros/tests/ui/t9_8_unknown_target.stderr

@@ -0,0 +1,50 @@
+warning: unexpected `cfg` condition value: `tokio`
+  --> tests/ui/t9_8_unknown_target.rs:8:1
+   |
+ 8 | / statechart! {
+ 9 | | M {
+10 | |     context: Ctx;
+11 | |     events: Ev;
+...  |
+17 | | }
+   | |_^
+   |
+   = note: no expected values for `feature`
+   = note: using a cfg inside a macro will use the cfgs from the destination crate and not the ones from the defining crate
+   = help: try referring to `statechart` crate for guidance on how handle this unexpected cfg
+   = help: the macro `statechart` may come from an old version of the `hsmc_macros` crate, try updating your dependency with `cargo update -p hsmc_macros`
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
+   = note: `#[warn(unexpected_cfgs)]` on by default
+   = note: this warning originates in the macro `statechart` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+warning: unexpected `cfg` condition value: `embassy`
+  --> tests/ui/t9_8_unknown_target.rs:8:1
+   |
+ 8 | / statechart! {
+ 9 | | M {
+10 | |     context: Ctx;
+11 | |     events: Ev;
+...  |
+17 | | }
+   | |_^
+   |
+   = note: no expected values for `feature`
+   = note: using a cfg inside a macro will use the cfgs from the destination crate and not the ones from the defining crate
+   = help: try referring to `statechart` crate for guidance on how handle this unexpected cfg
+   = help: the macro `statechart` may come from an old version of the `hsmc_macros` crate, try updating your dependency with `cargo update -p hsmc_macros`
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
+   = note: this warning originates in the macro `statechart` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0046]: not all trait items implemented, missing: `NonExistent`
+  --> tests/ui/t9_8_unknown_target.rs:19:1
+   |
+ 8 | / statechart! {
+ 9 | | M {
+10 | |     context: Ctx;
+11 | |     events: Ev;
+...  |
+17 | | }
+   | |_- `NonExistent` from trait
+18 |
+19 |   impl MActions for MActionContext<'_> {}
+   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `NonExistent` in implementation

hsmc-macros/tests/ui/t9_9_multiple_terminate.rs

@@ -0,0 +1,23 @@
+use hsmc::statechart;
+
+#[derive(Debug, Clone)]
+pub enum Ev { Halt, Abort }
+
+pub struct Ctx;
+
+statechart! {
+M {
+    context: Ctx;
+    events: Ev;
+    default(A);
+    terminate(Halt);
+    terminate(Abort);
+    state A { entry: e; }
+}
+}
+
+impl MActions for MActionContext<'_> {
+    fn e(&mut self) {}
+}
+
+fn main() {}

hsmc-macros/tests/ui/t9_9_multiple_terminate.stderr

@@ -0,0 +1,17 @@
+error: multiple `terminate` declarations
+  --> tests/ui/t9_9_multiple_terminate.rs:13:5
+   |
+13 |     terminate(Halt);
+   |     ^^^^^^^^^
+
+error[E0405]: cannot find trait `MActions` in this scope
+  --> tests/ui/t9_9_multiple_terminate.rs:19:6
+   |
+19 | impl MActions for MActionContext<'_> {
+   |      ^^^^^^^^ not found in this scope
+
+error[E0425]: cannot find type `MActionContext` in this scope
+  --> tests/ui/t9_9_multiple_terminate.rs:19:19
+   |
+19 | impl MActions for MActionContext<'_> {
+   |                   ^^^^^^^^^^^^^^ not found in this scope