Adding transitions support

src/main.rs

@@ -12,21 +12,28 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // let result = grammar::SetParser::new().parse(&buffer).unwrap();
 
 
-    let reactants = grammar::SetParser::new().parse("{a}").unwrap();
-    let inihibitors = grammar::SetParser::new().parse("{c}").unwrap();
-    let products = grammar::SetParser::new().parse("{a,c}").unwrap();
+    // -------------------------------------------------------------------------
+    // let reactants = grammar::SetParser::new().parse("{a}").unwrap();
+    // let inihibitors = grammar::SetParser::new().parse("{c}").unwrap();
+    // let products = grammar::SetParser::new().parse("{a,c}").unwrap();
 
-    let process1 = rsprocess::structure::RSreaction::from(reactants, inihibitors, products);
+    // let process1 = rsprocess::structure::RSreaction::from(reactants, inihibitors, products);
 
-    let reactants = grammar::SetParser::new().parse("{b}").unwrap();
-    let inihibitors = grammar::SetParser::new().parse("{c}").unwrap();
-    let products = grammar::SetParser::new().parse("{b,c}").unwrap();
+    // let reactants = grammar::SetParser::new().parse("{b}").unwrap();
+    // let inihibitors = grammar::SetParser::new().parse("{c}").unwrap();
+    // let products = grammar::SetParser::new().parse("{b,c}").unwrap();
 
-    let process2 = rsprocess::structure::RSreaction::from(reactants, inihibitors, products);
+    // let process2 = rsprocess::structure::RSreaction::from(reactants, inihibitors, products);
 
-    let current_state = grammar::SetParser::new().parse("{b}").unwrap();
+    // let current_state = grammar::SetParser::new().parse("{b}").unwrap();
 
-    println!("{:?}", rsprocess::classical::compute_all(&current_state, vec![&process1, &process2]));
+    // println!("{:?}", rsprocess::classical::compute_all(&current_state, vec![&process1, &process2]));
 
+
+    // -------------------------------------------------------------------------
+    let env = grammar::EnvironmentParser::new().parse("[x = {a}.{b}.x , y = ({a,c}.y + {b,c}.y)]").unwrap();
+    let process = grammar::ContextParser::new().parse("[({a}.nil + x + y)]").unwrap();
+
+    println!("{:?}", rsprocess::transitions::unfold(&env, &process));
     Ok(())
 }

src/rsprocess/classical.rs

@@ -4,6 +4,7 @@
 //! Reaction System (RS) Framework.
 //! The data is held in RSset or RSreaction, in the latter the reagents,
 //! inhibitors and products are held.
+#![allow(dead_code)]
 
 use super::structure::{RSset, RSreaction};
 

src/rsprocess/grammar.lalrpop

@@ -1,3 +1,4 @@
+use std::rc::Rc;
 use std::str::FromStr;
 use lalrpop_util::ParseError;
 use crate::rsprocess::structure::{RSset, RSprocess, RSenvironment, RSassert, RSassertOp, RSBHML};
@@ -39,23 +40,27 @@ Set_of_entities: RSset<'input> = {
 pub Context: Box<RSprocess<'input>> = {
     "[" "]" => Box::new(RSprocess::Nill),
     "[" <t: CTX_process>  "]" => Box::new(t),
-    "[" <t: Separeted<CTX_process, ",">> "]" =>
+    "[" <t: Separeted<Boxed_CTX_process, ",">> "]" =>
 	Box::new(RSprocess::NondeterministicChoice{ children: t })
 };
 
+Boxed_CTX_process: Rc<RSprocess<'input>> = {
+    <t: CTX_process> => Rc::new(t)
+}
+
 CTX_process: RSprocess<'input> = {
     <c: Set_of_entities> "." <k: CTX_process> =>
-	RSprocess::EntitySet{ entities: c, next_process: Box::new(k) },
+	RSprocess::EntitySet{ entities: c, next_process: Rc::new(k) },
     "(" <k: CTX_process>  ")" => k,
     "(" <k: Separeted<CTX_process, "+">> ")" =>
 	RSprocess::Summation{ children: k },
     "<" <n: Num> <k1: CTX_process> ">" "." <k: CTX_process> =>
 	RSprocess::WaitEntity{ repeat: n,
-			       repeated_process: Box::new(k1),
-			       next_process: Box::new(k)},
+			       repeated_process: Rc::new(k1),
+			       next_process: Rc::new(k)},
     "nil" => RSprocess::Nill,
     <identifier: Literal> =>
-	RSprocess::ConstantIdentifier{ identifier }
+	RSprocess::RecursiveIdentifier{ identifier }
 };
 
 // ----- EnvironmentParser -----
@@ -64,8 +69,8 @@ pub Environment: Box<RSenvironment<'input>> = {
     "[" <t: Separeted<Env_term, ",">> "]" => Box::new(RSenvironment::from(t))
 };
 
-Env_term: (&'input str, Box<RSprocess<'input>>) = {
-    <identifier: Literal> "=" <k: CTX_process> => (identifier, Box::new(k))
+Env_term: (&'input str, RSprocess<'input>) = {
+    <identifier: Literal> "=" <k: CTX_process> => (identifier, k)
 };
 
 // ----- AssertParser -----

src/rsprocess/mod.rs

@@ -1,2 +1,3 @@
 pub mod structure;
 pub mod classical;
+pub mod transitions;

src/rsprocess/structure.rs

@@ -1,10 +1,12 @@
-use std::collections::{BTreeMap, HashSet};
+#![allow(dead_code)]
+
+use std::collections::{HashMap, HashSet};
+use std::rc::Rc;
 
 // -----------------------------------------------------------------------------
 // RSset
 // -----------------------------------------------------------------------------
 #[derive(Clone, Debug)]
-#[allow(dead_code)]
 pub struct RSset<'a> {
     identifiers: HashSet<&'a str>
 }
@@ -40,7 +42,6 @@ impl<'a> RSset<'a> {
 	self.identifiers.is_disjoint(&b.identifiers)
     }
 
-    #[allow(dead_code)]
     pub fn union(&self, b: &RSset<'a>) -> RSset<'a> {
 	// TODO maybe find more efficient way
 	let mut ret: RSset = b.clone();
@@ -65,7 +66,6 @@ impl<'a> RSset<'a> {
 // RSreaction
 // -----------------------------------------------------------------------------
 #[derive(Clone, Debug)]
-#[allow(dead_code)]
 pub struct RSreaction<'a> {
     reactants: RSset<'a>,
     inihibitors: RSset<'a>,
@@ -73,7 +73,6 @@ pub struct RSreaction<'a> {
 }
 
 impl<'a> RSreaction<'a> {
-    #[allow(dead_code)]
     pub fn new() -> Self {
 	RSreaction{ reactants:   RSset::new(),
 		    inihibitors: RSset::new(),
@@ -91,7 +90,6 @@ impl<'a> RSreaction<'a> {
 	    && self.inihibitors.is_disjoint(current_state)
     }
 
-    #[allow(dead_code)]
     pub fn products_clone(&self) -> RSset<'a> {
 	self.products.clone()
     }
@@ -107,47 +105,123 @@ impl<'a> RSreaction<'a> {
 // RSprocess
 // -----------------------------------------------------------------------------
 #[derive(Clone, Debug)]
-#[allow(dead_code)]
 pub enum RSprocess<'a> {
     Nill,
-    ConstantIdentifier{identifier: &'a str},
-    EntitySet{entities: RSset<'a>, next_process: Box<RSprocess<'a>>},
-    WaitEntity{repeat: i64, repeated_process: Box<RSprocess<'a>>, next_process: Box<RSprocess<'a>>},
-    NondeterministicChoice{children: Vec<RSprocess<'a>>},
-    Summation{children: Vec<RSprocess<'a>>}
+    RecursiveIdentifier{identifier: &'a str},
+    EntitySet{entities: RSset<'a>, next_process: Rc<RSprocess<'a>>},
+    WaitEntity{repeat: i64, repeated_process: Rc<RSprocess<'a>>, next_process: Rc<RSprocess<'a>>},
+    Summation{children: Vec<RSprocess<'a>>},
+    NondeterministicChoice{children: Vec<Rc<RSprocess<'a>>>}
 }
 
+impl<'a> RSprocess<'a> {
+    // TODO: remove all the clone()
+    pub fn concat(&self, new: &RSprocess<'a>) -> RSprocess<'a>{
+	match (self, new) {
+	    (RSprocess::NondeterministicChoice{children: c1}, RSprocess::NondeterministicChoice{children: c2}) => {
+		RSprocess::NondeterministicChoice { children: [c1.clone(), c2.clone()].concat() }
+	    },
+	    (RSprocess::NondeterministicChoice{children}, new) |
+	    (new, RSprocess::NondeterministicChoice{children}) => {
+		let mut new_children = children.clone();
+		new_children.push(Rc::new(new.clone()));
+		RSprocess::NondeterministicChoice{ children: new_children }
+	    },
+	    (_, _) => {
+		RSprocess::NondeterministicChoice { children: vec![Rc::new(self.clone()), Rc::new(new.clone())] }
+	    }
+	}
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct RSChoices<'a> {
+    context_moves: Vec<(Rc<RSset<'a>>, Rc<RSprocess<'a>>)>
+}
+
+impl<'a> RSChoices<'a> {
+    pub fn new() -> Self {
+	RSChoices{ context_moves: vec![] }
+    }
+
+    pub fn append(&mut self, a: &mut RSChoices<'a>) {
+	self.context_moves.append(&mut a.context_moves);
+    }
+
+    pub fn replace(&mut self, a: Rc<RSprocess<'a>>) {
+	self.context_moves =
+	    self.context_moves
+	    .iter_mut()
+	    .map(|(c1, _)| (Rc::clone(c1), Rc::clone(&a))).collect::<Vec<_>>();
+    }
+
+    pub fn shuffle(&mut self, choices: RSChoices<'a>) {
+	if self.context_moves.is_empty() || choices.context_moves.is_empty() {
+	    self.context_moves = vec![];
+	} else {
+	    let mut new_self = vec![];
+	    for item_self in &self.context_moves {
+		for item_choices in &choices.context_moves {
+		    new_self.push((Rc::new(item_self.0.union(&item_choices.0)),
+				   Rc::new(item_self.1.concat(&item_choices.1))));
+		}
+	    }
+	    self.context_moves = new_self;
+	}
+    }
+}
+
+impl<'a, const N: usize> From<[(Rc<RSset<'a>>, Rc<RSprocess<'a>>); N]> for RSChoices<'a> {
+    fn from(arr: [(Rc<RSset<'a>>, Rc<RSprocess<'a>>); N]) -> Self {
+	RSChoices{context_moves: arr.to_vec()}
+    }
+}
+
+impl<'a> From<&[(Rc<RSset<'a>>, Rc<RSprocess<'a>>)]> for RSChoices<'a> {
+    fn from(arr: &[(Rc<RSset<'a>>, Rc<RSprocess<'a>>)]) -> Self {
+	RSChoices{context_moves: arr.to_vec()}
+    }
+}
+
+impl<'a> From<Vec<(Rc<RSset<'a>>, Rc<RSprocess<'a>>)>> for RSChoices<'a> {
+    fn from(arr: Vec<(Rc<RSset<'a>>, Rc<RSprocess<'a>>)>) -> Self {
+	RSChoices{context_moves: arr}
+    }
+}
 
 // -----------------------------------------------------------------------------
 // RSenvironment
 // -----------------------------------------------------------------------------
 #[derive(Clone, Debug)]
-#[allow(dead_code)]
 pub struct RSenvironment<'a> {
-    definitions: BTreeMap<&'a str, Box<RSprocess<'a>>>,
+    definitions: HashMap<&'a str, RSprocess<'a>>,
 }
 
 impl<'a> RSenvironment<'a> {
     pub fn new() -> RSenvironment<'a> {
-	RSenvironment{definitions: BTreeMap::new()}
+	RSenvironment{definitions: HashMap::new()}
+    }
+
+    pub fn get(&self, k: &'a str) -> Option<&RSprocess<'a>> {
+	self.definitions.get(k)
     }
 }
 
-impl<'a, const N: usize> From<[(&'a str, Box<RSprocess<'a>>); N]> for RSenvironment<'a> {
-    fn from(arr: [(&'a str, Box<RSprocess<'a>>); N]) -> Self {
-	RSenvironment{definitions: BTreeMap::from(arr)}
+impl<'a, const N: usize> From<[(&'a str, RSprocess<'a>); N]> for RSenvironment<'a> {
+    fn from(arr: [(&'a str, RSprocess<'a>); N]) -> Self {
+	RSenvironment{definitions: HashMap::from(arr)}
     }
 }
 
-impl<'a> From<&[(&'a str, Box<RSprocess<'a>>)]> for RSenvironment<'a> {
-    fn from(arr: &[(&'a str, Box<RSprocess<'a>>)]) -> Self {
-	RSenvironment{definitions: BTreeMap::from_iter(arr.to_vec())}
+impl<'a> From<&[(&'a str, RSprocess<'a>)]> for RSenvironment<'a> {
+    fn from(arr: &[(&'a str, RSprocess<'a>)]) -> Self {
+	RSenvironment{definitions: HashMap::from_iter(arr.to_vec())}
     }
 }
 
-impl<'a> From<Vec<(&'a str, Box<RSprocess<'a>>)>> for RSenvironment<'a> {
-    fn from(arr: Vec<(&'a str, Box<RSprocess<'a>>)>) -> Self {
-	RSenvironment{definitions: BTreeMap::from_iter(arr)}
+impl<'a> From<Vec<(&'a str, RSprocess<'a>)>> for RSenvironment<'a> {
+    fn from(arr: Vec<(&'a str, RSprocess<'a>)>) -> Self {
+	RSenvironment{definitions: HashMap::from_iter(arr)}
     }
 }
 
@@ -155,7 +229,6 @@ impl<'a> From<Vec<(&'a str, Box<RSprocess<'a>>)>> for RSenvironment<'a> {
 // RSassertOp
 // -----------------------------------------------------------------------------
 #[derive(Clone, Debug)]
-#[allow(dead_code)]
 pub enum RSassertOp {
     InW,
     InR,
@@ -167,7 +240,6 @@ pub enum RSassertOp {
 // RSassert
 // -----------------------------------------------------------------------------
 #[derive(Clone, Debug)]
-#[allow(dead_code)]
 pub enum RSassert<'a> {
     Not(Box<RSassert<'a>>),
     Xor(Box<RSassert<'a>>, Box<RSassert<'a>>),
@@ -181,7 +253,6 @@ pub enum RSassert<'a> {
 // RSBHML
 // -----------------------------------------------------------------------------
 #[derive(Clone, Debug)]
-#[allow(dead_code)]
 #[allow(clippy::upper_case_acronyms)]
 pub enum RSBHML<'a> {
     True,

src/rsprocess/transitions.rs

@@ -0,0 +1,58 @@
+#![allow(dead_code)]
+
+use std::rc::Rc;
+use super::structure::{RSChoices, RSenvironment, RSprocess};
+
+pub fn unfold<'a>(environment: &'a RSenvironment<'a>, context_process: &'a RSprocess<'a>) -> Result<RSChoices<'a>, String> {
+    match context_process {
+	RSprocess::Nill => Ok(RSChoices::new()),
+	RSprocess::RecursiveIdentifier{identifier} => {
+	    let newprocess = environment.get(identifier);
+	    if let Some(newprocess) = newprocess {
+		unfold(environment, newprocess)
+	    } else {
+		Err(format!("Recursive call to missing symbol: {identifier}"))
+	    }
+	},
+	RSprocess::EntitySet{entities, next_process} => {
+	    Ok(RSChoices::from(vec![(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)?;
+	    choices1.replace(Rc::clone(next_process));
+	    Ok(choices1)
+	},
+	RSprocess::WaitEntity{repeat, repeated_process, next_process} => {
+	    let mut choices1 = unfold(environment, repeated_process)?;
+	    choices1.replace(
+		Rc::new(
+		    RSprocess::WaitEntity{ repeat: (*repeat - 1),
+					   repeated_process: Rc::clone(repeated_process),
+					   next_process: Rc::clone(next_process) }
+		)
+	    );
+	    Ok(choices1)
+	},
+	RSprocess::Summation{children} => {
+	    // short-circuits with try_fold.
+	    children.iter().try_fold(RSChoices::new(), |mut acc, x| {
+		match unfold(environment, x) {
+		    Ok(mut choices) => {acc.append(&mut choices); Ok(acc)},
+		    Err(e) => Err(e)
+		}
+	    })
+	},
+	RSprocess::NondeterministicChoice{children} => {
+	    // short-circuits with try_fold.
+	    children.iter().try_fold(RSChoices::new(), |mut acc, x| {
+		match unfold(environment, x) {
+		    Ok(choices) => {acc.shuffle(choices); Ok(acc)},
+		    Err(e) => Err(e)
+		}
+	    })
+	}
+    }
+}