fn build_dependency_trees(definitions: Vec<ExecutableDefinition>) -> FnvHashMap<StringKey, Node> {
    let mut trees = FnvHashMap::with_capacity_and_hasher(definitions.len(), Default::default());

    for definition in definitions.into_iter() {
        let name = match &definition {
            ExecutableDefinition::Operation(operation) => operation.name.item,
            ExecutableDefinition::Fragment(fragment) => fragment.name.item,
        };

        // Visit the selections of the IR to build it's `children`
        let mut children = vec![];
        let selections = match &definition {
            ExecutableDefinition::Operation(operation) => &operation.selections,
            ExecutableDefinition::Fragment(fragment) => &fragment.selections,
        };
        visit_selections(&mut trees, &selections, name, &mut children);

        // Insert or update the representation of the IR in the dependency tree
        match trees.entry(name) {
            // Add a new node for current IR to the dependency tree
            Entry::Vacant(entry) => {
                entry.insert(Node {
                    ir: Some(definition),
                    parents: vec![],
                    children,
                });
            }

            // The node is already created when visiting selections of the IR, but it's `ir` and `children` haven't been set
            Entry::Occupied(mut entry) => {
                let node = entry.get_mut();
                if let Some(def) = &node.ir {
                    panic!(
                        "Duplicate definition: had {:?} and found another {:?}.",
                        def, node.ir
                    );
                }
                node.ir = Some(definition);
                node.children = children;
            }
        }
    }
    trees
}
// Build a set of dependency trees that nodes are "doubly linked"
Build a set of dependency trees that nodes are "doubly linked"
Build a set of dependency trees that nodes are " doubly linked "
fn build_dependency_trees(definitions: Vec<ExecutableDefinition>) -> FnvHashMap<StringKey, Node> {
    let mut trees = FnvHashMap::with_capacity_and_hasher(definitions.len(), Default::default());
    for definition in definitions.into_iter() {
        let name = match &definition {
            ExecutableDefinition::Operation(operation) => operation.name.item,
            ExecutableDefinition::Fragment(fragment) => fragment.name.item,
        };
        // Visit the selections of the IR to build it's `children`
        let mut children = vec![];
        let selections = match &definition {
            ExecutableDefinition::Operation(operation) => &operation.selections,
            ExecutableDefinition::Fragment(fragment) => &fragment.selections,
        };
        visit_selections(&mut trees, &selections, name, &mut children);
        // Insert or update the representation of the IR in the dependency tree
        match trees.entry(name) {
            // Add a new node for current IR to the dependency tree
            Entry::Vacant(entry) => {
                entry.insert(Node {
                    ir: Some(definition),
                    parents: vec![],
                    children,
                });
            }
            // The node is already created when visiting selections of the IR, but it's `ir` and `children` haven't been set
            Entry::Occupied(mut entry) => {
                let node = entry.get_mut();
                if let Some(def) = &node.ir {
                    panic!(
                        "Duplicate definition: had {:?} and found another {:?}.",
                        def, node.ir
                    );
                }
                node.ir = Some(definition);
                node.children = children;
            }
        }
    }
    trees
}
fn build_dependency_trees ( definitions : Vec < ExecutableDefinition > ) -> FnvHashMap < StringKey , Node > { let mut trees = FnvHashMap :: with_capacity_and_hasher ( definitions . len ( ) , Default :: default ( ) ) ; for definition in definitions . into_iter ( ) { let name = match & definition { ExecutableDefinition :: Operation ( operation ) => operation . name . item , ExecutableDefinition :: Fragment ( fragment ) => fragment . name . item , } ; // Visit the selections of the IR to build it's `children` let mut children = vec ! [ ] ; let selections = match & definition { ExecutableDefinition :: Operation ( operation ) => & operation . selections , ExecutableDefinition :: Fragment ( fragment ) => & fragment . selections , } ; visit_selections ( & mut trees , & selections , name , & mut children ) ; // Insert or update the representation of the IR in the dependency tree match trees . entry ( name ) { // Add a new node for current IR to the dependency tree Entry :: Vacant ( entry ) => { entry . insert ( Node { ir : Some ( definition ) , parents : vec ! [ ] , children , } ) ; } // The node is already created when visiting selections of the IR, but it's `ir` and `children` haven't been set Entry :: Occupied ( mut entry ) => { let node = entry . get_mut ( ) ; if let Some ( def ) = & node . ir { panic ! ( " " def node ir ) ; } node . ir = Some ( definition ) ; node . children = children ; } } } trees }
Build a set of dependency trees that nodes are "doubly linked"
Build a set of dependency trees that nodes are " doubly linked "
definitions
Vec<ExecutableDefinition>
definitions
Vec<ExecutableDefinition>