Added guarded context

src/rsprocess/structure.rs

@@ -143,7 +143,7 @@ impl IntoIterator for RSset {
 // -----------------------------------------------------------------------------
 
 /// Basic structure for a reaction.
-#[derive(Clone, Debug, Serialize, Deserialize)]
+#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq, Hash)]
 pub struct RSreaction {
     pub reactants: RSset,
     pub inhibitors: RSset,
@@ -195,6 +195,10 @@ pub enum RSprocess {
         entities: RSset,
         next_process: Rc<RSprocess>,
     },
+    Guarded {
+	reaction: RSreaction,
+	next_process: Rc<RSprocess>,
+    },
     WaitEntity {
         repeat: i64,
         repeated_process: Rc<RSprocess>,
@@ -248,6 +252,12 @@ impl RSprocess {
                     elements.push(entities);
                     queue.push_back(next_process);
                 }
+		Self::Guarded { reaction, next_process } => {
+		    elements.push(&reaction.reactants);
+		    elements.push(&reaction.inhibitors);
+		    elements.push(&reaction.products);
+		    queue.push_back(next_process);
+		}
                 Self::WaitEntity {
                     repeat: _,
                     repeated_process,

src/rsprocess/support_structures.rs

@@ -14,7 +14,7 @@ impl<'a> TransitionsIterator<'a> {
     pub fn from(
 	system: &'a RSsystem
     ) -> Result<TransitionsIterator<'a>, String> {
-        match unfold(&system.delta, &system.context_process) {
+        match unfold(&system.delta, &system.context_process, &system.available_entities) {
             Ok(o) => Ok(TransitionsIterator {
                 choices_iterator: o.into_iter(),
                 system,

src/rsprocess/transitions.rs

@@ -16,44 +16,46 @@ use std::rc::Rc;
 pub fn unfold(
     environment: &RSenvironment,
     context_process: &RSprocess,
+    current_entities: &RSset,
 ) -> Result<RSchoices, String> {
     match context_process {
-        RSprocess::Nill => Ok(RSchoices::new()),
+        RSprocess::Nill => {
+	    Ok(RSchoices::new())
+	},
         RSprocess::RecursiveIdentifier { identifier } => {
             let newprocess = environment.get(*identifier);
             if let Some(newprocess) = newprocess {
-                unfold(environment, newprocess)
+                unfold(environment, newprocess, current_entities)
             } else {
                 Err(format!("Missing symbol in context: {identifier}"))
             }
         }
-        RSprocess::EntitySet {
-            entities,
-            next_process,
-        } => Ok(RSchoices::from(vec![(
+        RSprocess::EntitySet { entities, next_process, } => {
+	    Ok(RSchoices::from([(
 		Rc::new(entities.clone()),
 		Rc::clone(next_process),
-        )])),
-        RSprocess::WaitEntity {
-            repeat,
-            repeated_process: _,
-            next_process,
-        } if *repeat <= 0 => unfold(environment, next_process),
-        RSprocess::WaitEntity {
-            repeat,
-            repeated_process,
-            next_process,
-        } if *repeat == 1 => {
-            let mut choices1 = unfold(environment, repeated_process)?;
+            )]))
+	},
+	RSprocess::Guarded { reaction, next_process } => {
+	    if reaction.enabled(current_entities) {
+		Ok(RSchoices::from([(Rc::new(reaction.products.clone()),
+				     Rc::clone(next_process))]))
+	    } else {
+		Ok(RSchoices::new())
+	    }
+	}
+        RSprocess::WaitEntity { repeat, repeated_process: _, next_process, }
+	if *repeat <= 0 => {
+	    unfold(environment, next_process, current_entities)
+	},
+        RSprocess::WaitEntity { repeat, repeated_process, next_process, }
+	if *repeat == 1 => {
+            let mut choices1 = unfold(environment, repeated_process, current_entities)?;
             choices1.replace(Rc::clone(next_process));
             Ok(choices1)
         }
-        RSprocess::WaitEntity {
-            repeat,
-            repeated_process,
-            next_process,
-        } => {
-            let mut choices1 = unfold(environment, repeated_process)?;
+        RSprocess::WaitEntity { repeat, repeated_process, next_process, } => {
+            let mut choices1 = unfold(environment, repeated_process, current_entities)?;
             choices1.replace(Rc::new(RSprocess::WaitEntity {
                 repeat: (*repeat - 1),
                 repeated_process: Rc::clone(repeated_process),
@@ -64,7 +66,7 @@ pub fn unfold(
         RSprocess::Summation { children } => {
             // short-circuits with try_fold.
             children.iter().try_fold(RSchoices::new(), |mut acc, x| {
-                match unfold(environment, x) {
+                match unfold(environment, x, current_entities) {
                     Ok(mut choices) => {
                         acc.append(&mut choices);
                         Ok(acc)
@@ -82,7 +84,7 @@ pub fn unfold(
                 )]))
             } else {
                 children.iter().try_fold(RSchoices::new(), |mut acc, x| {
-                    acc.shuffle(unfold(environment, x)?);
+                    acc.shuffle(unfold(environment, x, current_entities)?);
                     Ok(acc)
                 })
             }

src/rsprocess/translator.rs

@@ -166,28 +166,27 @@ fn print_process(
     match process {
         Nill => {
             write!(f, "Nill")
-        }
+        },
         RecursiveIdentifier { identifier } => {
             write!(f,
 		   "[{}]",
 		   translator.decode(*identifier).unwrap_or("Missing".into()))
-        }
-        EntitySet {
-            entities,
-            next_process,
-        } => {
+        },
+        EntitySet { entities, next_process, } => {
             write!(
                 f,
                 "{}.{}",
                 RSsetDisplay::from(translator, entities),
                 RSprocessDisplay::from(translator, next_process)
             )
-        }
-        WaitEntity {
-            repeat,
-            repeated_process,
-            next_process,
-        } => {
+        },
+	Guarded { reaction, next_process } => {
+	    write!(f,
+		   "?{}?.{}",
+		   RSreactionDisplay::from(translator, reaction),
+		   RSprocessDisplay::from(translator, next_process))
+	},
+        WaitEntity { repeat, repeated_process, next_process, } => {
             write!(
                 f,
                 "({})^{repeat}.{}",