Struct RewriteGraph 

pub struct RewriteGraph(/* private fields */);

A wrapper around a graph

Methods from Deref<Target = Graph<String, String>>

pub fn node_count(&self) -> usize

Return the number of nodes (also called vertices) in the graph.

Computes in O(1) time.

pub fn edge_count(&self) -> usize

Return the number of edges in the graph.

Computes in O(1) time.

pub fn is_directed(&self) -> bool

Whether the graph has directed edges or not.

pub fn node_weight(&self, a: NodeIndex<Ix>) -> Option<&N>

Access the weight for node a.

If node a doesn’t exist in the graph, return None. Also available with indexing syntax: &graph[a].

pub fn edge_weight(&self, e: EdgeIndex<Ix>) -> Option<&E>

Access the weight for edge e.

If edge e doesn’t exist in the graph, return None. Also available with indexing syntax: &graph[e].

pub fn edge_endpoints( &self, e: EdgeIndex<Ix>, ) -> Option<(NodeIndex<Ix>, NodeIndex<Ix>)>

Access the source and target nodes for e.

If edge e doesn’t exist in the graph, return None.

pub fn neighbors(&self, a: NodeIndex<Ix>) -> Neighbors<'_, E, Ix>

Return an iterator of all nodes with an edge starting from a.

• Directed: Outgoing edges from a.
• Undirected: All edges from or to a.

Produces an empty iterator if the node doesn’t exist.
Iterator element type is NodeIndex<Ix>.

Use .neighbors(a).detach() to get a neighbor walker that does not borrow from the graph.

pub fn neighbors_directed( &self, a: NodeIndex<Ix>, dir: Direction, ) -> Neighbors<'_, E, Ix>

Return an iterator of all neighbors that have an edge between them and a, in the specified direction. If the graph’s edges are undirected, this is equivalent to .neighbors(a).

• Directed, Outgoing: All edges from a.
• Directed, Incoming: All edges to a.
• Undirected: All edges from or to a.

Produces an empty iterator if the node doesn’t exist.
Iterator element type is NodeIndex<Ix>.

For a Directed graph, neighbors are listed in reverse order of their addition to the graph, so the most recently added edge’s neighbor is listed first. The order in an Undirected graph is arbitrary.

Use .neighbors_directed(a, dir).detach() to get a neighbor walker that does not borrow from the graph.

pub fn neighbors_undirected(&self, a: NodeIndex<Ix>) -> Neighbors<'_, E, Ix>

Return an iterator of all neighbors that have an edge between them and a, in either direction. If the graph’s edges are undirected, this is equivalent to .neighbors(a).

• Directed and Undirected: All edges from or to a.

Produces an empty iterator if the node doesn’t exist.
Iterator element type is NodeIndex<Ix>.

Use .neighbors_undirected(a).detach() to get a neighbor walker that does not borrow from the graph.

pub fn edges(&self, a: NodeIndex<Ix>) -> Edges<'_, E, Ty, Ix>

Return an iterator of all edges of a.

• Directed: Outgoing edges from a.
• Undirected: All edges connected to a.

Produces an empty iterator if the node doesn’t exist.
Iterator element type is EdgeReference<E, Ix>.

pub fn edges_directed( &self, a: NodeIndex<Ix>, dir: Direction, ) -> Edges<'_, E, Ty, Ix>

Return an iterator of all edges of a, in the specified direction.

• Directed, Outgoing: All edges from a.
• Directed, Incoming: All edges to a.
• Undirected, Outgoing: All edges connected to a, with a being the source of each edge.
• Undirected, Incoming: All edges connected to a, with a being the target of each edge.

Produces an empty iterator if the node a doesn’t exist.
Iterator element type is EdgeReference<E, Ix>.

pub fn edges_connecting( &self, a: NodeIndex<Ix>, b: NodeIndex<Ix>, ) -> EdgesConnecting<'_, E, Ty, Ix>

Return an iterator over all the edges connecting a and b.

• Directed: Outgoing edges from a.
• Undirected: All edges connected to a.

Iterator element type is EdgeReference<E, Ix>.

pub fn contains_edge(&self, a: NodeIndex<Ix>, b: NodeIndex<Ix>) -> bool

Lookup if there is an edge from a to b.

Computes in O(e’) time, where e’ is the number of edges connected to a (and b, if the graph edges are undirected).

pub fn find_edge( &self, a: NodeIndex<Ix>, b: NodeIndex<Ix>, ) -> Option<EdgeIndex<Ix>>

Lookup an edge from a to b.

Computes in O(e’) time, where e’ is the number of edges connected to a (and b, if the graph edges are undirected).

pub fn find_edge_undirected( &self, a: NodeIndex<Ix>, b: NodeIndex<Ix>, ) -> Option<(EdgeIndex<Ix>, Direction)>

Lookup an edge between a and b, in either direction.

If the graph is undirected, then this is equivalent to .find_edge().

Return the edge index and its directionality, with Outgoing meaning from a to b and Incoming the reverse, or None if the edge does not exist.

pub fn externals(&self, dir: Direction) -> Externals<'_, N, Ty, Ix>

Return an iterator over either the nodes without edges to them (Incoming) or from them (Outgoing).

An internal node has both incoming and outgoing edges. The nodes in .externals(Incoming) are the source nodes and .externals(Outgoing) are the sinks of the graph.

For a graph with undirected edges, both the sinks and the sources are just the nodes without edges.

The whole iteration computes in O(|V|) time where V is the set of nodes.

pub fn node_indices(&self) -> NodeIndices<Ix>

Return an iterator over the node indices of the graph.

For example, in a rare case where a graph algorithm were not applicable, the following code will iterate through all nodes to find a specific index:

let index = g.node_indices().find(|i| g[*i] == "book").unwrap();

pub fn node_weights(&self) -> NodeWeights<'_, N, Ix>

Return an iterator yielding immutable access to all node weights.

The order in which weights are yielded matches the order of their node indices.

pub fn edge_indices(&self) -> EdgeIndices<Ix>

Return an iterator over the edge indices of the graph

pub fn edge_references(&self) -> EdgeReferences<'_, E, Ix>

Create an iterator over all edges, in indexed order.

Iterator element type is EdgeReference<E, Ix>.

pub fn edge_weights(&self) -> EdgeWeights<'_, E, Ix>

Return an iterator yielding immutable access to all edge weights.

The order in which weights are yielded matches the order of their edge indices.

pub fn raw_nodes(&self) -> &[Node<N, Ix>]

Access the internal node array.

pub fn raw_edges(&self) -> &[Edge<E, Ix>]

Access the internal edge array.

pub fn first_edge( &self, a: NodeIndex<Ix>, dir: Direction, ) -> Option<EdgeIndex<Ix>>

Accessor for data structure internals: the first edge in the given direction.

pub fn next_edge( &self, e: EdgeIndex<Ix>, dir: Direction, ) -> Option<EdgeIndex<Ix>>

Accessor for data structure internals: the next edge for the given direction.

pub fn capacity(&self) -> (usize, usize)

Return the current node and edge capacity of the graph.

pub fn map<'a, F, G, N2, E2>( &'a self, node_map: F, edge_map: G, ) -> Graph<N2, E2, Ty, Ix>

where F: FnMut(NodeIndex<Ix>, &'a N) -> N2, G: FnMut(EdgeIndex<Ix>, &'a E) -> E2,

Create a new Graph by mapping node and edge weights to new values.

The resulting graph has the same structure and the same graph indices as self.

pub fn filter_map<'a, F, G, N2, E2>( &'a self, node_map: F, edge_map: G, ) -> Graph<N2, E2, Ty, Ix>

where F: FnMut(NodeIndex<Ix>, &'a N) -> Option<N2>, G: FnMut(EdgeIndex<Ix>, &'a E) -> Option<E2>,

Create a new Graph by mapping nodes and edges. A node or edge may be mapped to None to exclude it from the resulting graph.

Nodes are mapped first with the node_map closure, then edge_map is called for the edges that have not had any endpoint removed.

The resulting graph has the structure of a subgraph of the original graph. If no nodes are removed, the resulting graph has compatible node indices; if neither nodes nor edges are removed, the result has the same graph indices as self.

Trait Implementations

impl AsRef<Graph<String, String>> for RewriteGraph

fn as_ref(&self) -> &Graph<String, String>

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for RewriteGraph

fn clone(&self) -> RewriteGraph

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Deref for RewriteGraph

type Target = Graph<String, String>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl From<Graph<String, String>> for RewriteGraph

fn from(value: Graph<String, String>) -> Self

Converts to this type from the input type.