bendns' repos / rust-fsm
Finite state machines in rust; bendns fork to add types.
Diffstat (limited to 'rust-fsm-dsl/src/parser.rs')
-rw-r--r--rust-fsm-dsl/src/parser.rs32
1 files changed, 32 insertions, 0 deletions
diff --git a/rust-fsm-dsl/src/parser.rs b/rust-fsm-dsl/src/parser.rs
index 25a1283..7ea732d 100644
--- a/rust-fsm-dsl/src/parser.rs
+++ b/rust-fsm-dsl/src/parser.rs
@@ -7,6 +7,7 @@ use syn::{
mod kw {
syn::custom_keyword!(derive);
+ syn::custom_keyword!(repr_c);
}
/// The output of a state transition
@@ -105,6 +106,34 @@ impl Parse for TransitionDef {
}
}
+
+struct ReprC {
+ repr_c: Option<bool>,
+}
+
+impl Parse for ReprC {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let lookahead = input.lookahead1();
+ if lookahead.peek(kw::repr_c) {
+ let kw_repr_c = input.parse::<kw::repr_c>()?;
+ let entries_content;
+ parenthesized!(entries_content in input);
+ match entries_content.parse::<syn::Lit>() {
+ Ok(syn::Lit::Bool(b)) => {
+ return Ok( ReprC {
+ repr_c: Some(b.value()),
+ });
+ },
+ _ => {
+ return Err(Error::new_spanned(kw_repr_c, "Invalid repr_c argument"));
+ },
+ }
+ }
+ Ok(ReprC { repr_c: None })
+ }
+}
+
+
struct Derives {
derives: Option<Vec<Ident>>,
}
@@ -152,11 +181,13 @@ pub struct StateMachineDef {
pub initial_state: Ident,
pub transitions: Vec<TransitionDef>,
pub derives: Option<Vec<Ident>>,
+ pub repr_c: Option<bool>,
}
impl Parse for StateMachineDef {
fn parse(input: ParseStream) -> Result<Self> {
let Derives { derives } = input.parse()?;
+ let ReprC { repr_c } = input.parse()?;
let visibility = input.parse()?;
let name = input.parse()?;
@@ -176,6 +207,7 @@ impl Parse for StateMachineDef {
initial_state,
transitions,
derives,
+ repr_c,
})
}
}