pub fn validate_declaration_deps(&self) -> Result<Vec<&Decl>, ParseError> {
        // The number of undelcared dependencies for each decl.
        let mut degrees: BTreeMap<&Decl, u32> = BTreeMap::new();
        // Records the decls that depend on each other.
        let mut inverse_dependencies: BTreeMap<&Decl, Vec<&Decl>> = BTreeMap::new();

        for decl in self.namespaces.iter().flat_map(|(_, decls)| decls.iter()) {
            degrees.insert(&decl, 0);
        }

        for decl in self.namespaces.iter().flat_map(|(_, decls)| decls.iter()) {
            let deps = self.decl_dependencies(&decl)?;
            for dep in deps.iter().filter(|&dep| dep != &decl) {
                let entry = degrees.get_mut(&decl).unwrap();
                *entry += 1;
                let entry = inverse_dependencies.entry(&dep).or_insert(Vec::new());
                entry.push(&decl);
            }
        }

        // Remove mutability.
        let inverse_dependencies = inverse_dependencies;

        // Start with all decls that have no incoming edges.
        // The list is initially sorted in ascending order and newly-available declarations are
        // simply added to the back of the list.
        let mut decls_without_deps = degrees
            .iter()
            .filter(|(_, &degrees)| degrees == 0)
            .map(|(&decl, _)| decl)
            .sorted()
            .collect::<Vec<_>>();

        let mut decl_order = Vec::new();
        // Pull one out of the queue.
        while let Some(decl) = decls_without_deps.pop() {
            assert_eq!(degrees.get(decl), Some(&0));
            decl_order.push(decl);

            // Decrement the incoming degree of all other decls it points to.
            if let Some(inverse_deps) = inverse_dependencies.get(decl) {
                for inverse_dep in inverse_deps.iter().sorted() {
                    let degree = degrees.get_mut(inverse_dep).unwrap();
                    assert_ne!(*degree, 0);
                    *degree -= 1;
                    if *degree == 0 {
                        decls_without_deps.push(inverse_dep);
                    }
                }
            }
        }

        if decl_order.len() != degrees.len() {
            // We didn't visit all the edges! There was a cycle.
            return Err(ParseError::InvalidDeps(String::from(
                "There is a cycle in the declarations",
            )));
        }

        Ok(decl_order
            .into_iter()
            .filter(|decl| {
                if is_placeholder_struct(decl) {
                    return false;
                }
                let ident: Option<&Ident> = match decl {
                    Decl::Protocol { name, .. } => Some(name),
                    Decl::Struct { name, .. } => Some(name),
                    Decl::Union { name, .. } => Some(name),
                    Decl::Enum { name, .. } => Some(name),
                    Decl::Alias(to, _from) => Some(to),
                    Decl::Constant { name, .. } => Some(name),
                    Decl::Resource { .. } => None,
                };
                match ident {
                    Some(ident) => {
                        if let Some(ref ns) = ident.fq().0 {
                            ns == &self.primary_namespace
                        } else {
                            true
                        }
                    }
                    None => true,
                }
            })
            .collect())
    }
/// Validates that the declarations are cycle free and returns declaration ordering.
Validates that the declarations are cycle free and returns declaration ordering.
Validates that the declarations are cycle free and returns declaration ordering .
pub fn validate_declaration_deps(&self) -> Result<Vec<&Decl>, ParseError> {
        // The number of undelcared dependencies for each decl.
        let mut degrees: BTreeMap<&Decl, u32> = BTreeMap::new();
        // Records the decls that depend on each other.
        let mut inverse_dependencies: BTreeMap<&Decl, Vec<&Decl>> = BTreeMap::new();
        for decl in self.namespaces.iter().flat_map(|(_, decls)| decls.iter()) {
            degrees.insert(&decl, 0);
        }
        for decl in self.namespaces.iter().flat_map(|(_, decls)| decls.iter()) {
            let deps = self.decl_dependencies(&decl)?;
            for dep in deps.iter().filter(|&dep| dep != &decl) {
                let entry = degrees.get_mut(&decl).unwrap();
                *entry += 1;
                let entry = inverse_dependencies.entry(&dep).or_insert(Vec::new());
                entry.push(&decl);
            }
        }
        // Remove mutability.
        let inverse_dependencies = inverse_dependencies;
        // Start with all decls that have no incoming edges.
        // The list is initially sorted in ascending order and newly-available declarations are
        // simply added to the back of the list.
        let mut decls_without_deps = degrees
            .iter()
            .filter(|(_, &degrees)| degrees == 0)
            .map(|(&decl, _)| decl)
            .sorted()
            .collect::<Vec<_>>();
        let mut decl_order = Vec::new();
        // Pull one out of the queue.
        while let Some(decl) = decls_without_deps.pop() {
            assert_eq!(degrees.get(decl), Some(&0));
            decl_order.push(decl);
            // Decrement the incoming degree of all other decls it points to.
            if let Some(inverse_deps) = inverse_dependencies.get(decl) {
                for inverse_dep in inverse_deps.iter().sorted() {
                    let degree = degrees.get_mut(inverse_dep).unwrap();
                    assert_ne!(*degree, 0);
                    *degree -= 1;
                    if *degree == 0 {
                        decls_without_deps.push(inverse_dep);
                    }
                }
            }
        }
        if decl_order.len() != degrees.len() {
            // We didn't visit all the edges! There was a cycle.
            return Err(ParseError::InvalidDeps(String::from(
                "There is a cycle in the declarations",
            )));
        }
        Ok(decl_order
            .into_iter()
            .filter(|decl| {
                if is_placeholder_struct(decl) {
                    return false;
                }
                let ident: Option<&Ident> = match decl {
                    Decl::Protocol { name, .. } => Some(name),
                    Decl::Struct { name, .. } => Some(name),
                    Decl::Union { name, .. } => Some(name),
                    Decl::Enum { name, .. } => Some(name),
                    Decl::Alias(to, _from) => Some(to),
                    Decl::Constant { name, .. } => Some(name),
                    Decl::Resource { .. } => None,
                };
                match ident {
                    Some(ident) => {
                        if let Some(ref ns) = ident.fq().0 {
                            ns == &self.primary_namespace
                        } else {
                            true
                        }
                    }
                    None => true,
                }
            })
            .collect())
    }
pub fn validate_declaration_deps ( & self ) -> Result < Vec < & Decl > , ParseError > { // The number of undelcared dependencies for each decl. let mut degrees : BTreeMap < & Decl , u32 > = BTreeMap :: new ( ) ; // Records the decls that depend on each other. let mut inverse_dependencies : BTreeMap < & Decl , Vec < & Decl > > = BTreeMap :: new ( ) ; for decl in self . namespaces . iter ( ) . flat_map ( | ( _ , decls ) | decls . iter ( ) ) { degrees . insert ( & decl , 0 ) ; } for decl in self . namespaces . iter ( ) . flat_map ( | ( _ , decls ) | decls . iter ( ) ) { let deps = self . decl_dependencies ( & decl ) ? ; for dep in deps . iter ( ) . filter ( | & dep | dep != & decl ) { let entry = degrees . get_mut ( & decl ) . unwrap ( ) ; * entry += 1 ; let entry = inverse_dependencies . entry ( & dep ) . or_insert ( Vec :: new ( ) ) ; entry . push ( & decl ) ; } } // Remove mutability. let inverse_dependencies = inverse_dependencies ; // Start with all decls that have no incoming edges. // The list is initially sorted in ascending order and newly-available declarations are // simply added to the back of the list. let mut decls_without_deps = degrees . iter ( ) . filter ( | ( _ , & degrees ) | degrees == 0 ) . map ( | ( & decl , _ ) | decl ) . sorted ( ) . collect :: < Vec < _ > > ( ) ; let mut decl_order = Vec :: new ( ) ; // Pull one out of the queue. while let Some ( decl ) = decls_without_deps . pop ( ) { assert_eq ! ( degrees get ( decl ) Some ( 0 ) ) ; decl_order . push ( decl ) ; // Decrement the incoming degree of all other decls it points to. if let Some ( inverse_deps ) = inverse_dependencies . get ( decl ) { for inverse_dep in inverse_deps . iter ( ) . sorted ( ) { let degree = degrees . get_mut ( inverse_dep ) . unwrap ( ) ; assert_ne ! ( degree 0 ) ; * degree -= 1 ; if * degree == 0 { decls_without_deps . push ( inverse_dep ) ; } } } } if decl_order . len ( ) != degrees . len ( ) { // We didn't visit all the edges! There was a cycle. return Err ( ParseError :: InvalidDeps ( String :: from ( " " , ) ) ) ; } Ok ( decl_order . into_iter ( ) . filter ( | decl | { if is_placeholder_struct ( decl ) { return false ; } let ident : Option < & Ident > = match decl { Decl :: Protocol { name , .. } => Some ( name ) , Decl :: Struct { name , .. } => Some ( name ) , Decl :: Union { name , .. } => Some ( name ) , Decl :: Enum { name , .. } => Some ( name ) , Decl :: Alias ( to , _from ) => Some ( to ) , Decl :: Constant { name , .. } => Some ( name ) , Decl :: Resource { .. } => None , } ; match ident { Some ( ident ) => { if let Some ( ref ns ) = ident . fq ( ) . 0 { ns == & self . primary_namespace } else { true } } None => true , } } ) . collect ( ) ) }
Validates that the declarations are cycle free and returns declaration ordering.
Validates that the declarations are cycle free and returns declaration ordering .
&self
&self