Renamed len() to capacity() in EntityMap, VertexMap, and EdgeMap

len() is generally expected to describe the number of elements in a collection,
but in this case elements beyond len() are accessible without restriction.
capacity() is a better name because it describes data storage size.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "grapherity"
-version = "0.1.0"
+version = "0.2.1"
 authors = ["Stefan Müller"]
 edition = "2024"
 rust-version = "1.85.0"

src/algorithms.rs

@@ -261,14 +261,14 @@ where
     (visited, None)
 }
 
-pub fn find_path<G>(graph: &G, source: G::Vertex, target: G::Vertex) -> Option<Vec<G::Edge>>
+pub fn dfs_find_path<G>(graph: &G, source: G::Vertex, target: G::Vertex) -> Option<Vec<G::Edge>>
 where
     G: GraphTopology,
 {
-    find_path_where(graph, source, |v| v == target)
+    dfs_find_path_where(graph, source, |v| v == target)
 }
 
-pub fn find_path_where<G, P>(graph: &G, source: G::Vertex, predicate: P) -> Option<Vec<G::Edge>>
+pub fn dfs_find_path_where<G, P>(graph: &G, source: G::Vertex, predicate: P) -> Option<Vec<G::Edge>>
 where
     G: GraphTopology,
     P: Fn(G::Vertex) -> bool,

src/lib.rs

@@ -3,4 +3,8 @@ pub mod maps;
 pub mod models;
 pub mod traits;
 
+pub mod prelude {
+    pub use crate::traits::{GraphTopology, GraphTopologyDeletion};
+}
+
 mod testing;

src/maps.rs

@@ -13,9 +13,9 @@ impl<V: Copy, T: Clone> VertexMap<V, T> {
         }
     }
 
-    // Reads beyond len() are valid and return the default value.
-    pub fn len(&self) -> usize {
-        self.inner.len()
+    // Reads beyond capacity() are valid and return the default value.
+    pub fn capacity(&self) -> usize {
+        self.inner.capacity()
     }
 
     pub fn sync<G: GraphTopology<Vertex = V>>(&mut self, graph: &G) {
@@ -48,9 +48,9 @@ impl<E: Copy, T: Clone> EdgeMap<E, T> {
         }
     }
 
-    // Reads beyond len() are valid and return the default value.
-    pub fn len(&self) -> usize {
-        self.inner.len()
+    // Reads beyond capacity() are valid and return the default value.
+    pub fn capacity(&self) -> usize {
+        self.inner.capacity()
     }
 
     pub fn sync<G: GraphTopology<Edge = E>>(&mut self, graph: &G) {
@@ -87,7 +87,7 @@ impl<E: Copy, T: Clone> EntityMap<E, T> {
         }
     }
 
-    pub fn len(&self) -> usize {
+    pub fn capacity(&self) -> usize {
         self.data.len()
     }
 

src/models.rs

@@ -1,2 +1,5 @@
 pub mod append_graph;
 pub mod graph;
+
+pub use append_graph::{AppendGraph, AppendGraphEdgeMap, AppendGraphVertexMap};
+pub use graph::{Graph, GraphEdgeMap, GraphVertexMap};

src/models/append_graph.rs

@@ -5,9 +5,12 @@ use crate::traits::{GraphTopology, IncidenceCursor};
 pub struct Vertex(usize);
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
-pub struct Incidence(usize);
+pub struct Edge(usize);
 
-impl Incidence {
+pub type AppendGraphVertexMap<T> = VertexMap<Vertex, T>;
+pub type AppendGraphEdgeMap<T> = EdgeMap<Edge, T>;
+
+impl Edge {
     fn normalize(&self) -> Self {
         Self(self.0 & !1)
     }
@@ -15,22 +18,22 @@ impl Incidence {
 
 struct VertexIncidenceHeader {
     incidence_count: usize,
-    first_incidence: Option<Incidence>,
+    first_incidence: Option<Edge>,
 }
 
 #[derive(Copy, Clone)]
 struct IncidenceEntry {
-    next: Option<Incidence>,
+    next: Option<Edge>,
     adjacent: Vertex,
 }
 
 #[derive(Copy, Clone)]
 pub struct AppendGraphIncidenceCursor {
-    incidence: Option<Incidence>,
+    incidence: Option<Edge>,
 }
 
 impl IncidenceCursor<AppendGraph> for AppendGraphIncidenceCursor {
-    fn next(&mut self, graph: &AppendGraph) -> Option<(Vertex, Incidence)> {
+    fn next(&mut self, graph: &AppendGraph) -> Option<(Vertex, Edge)> {
         graph.step_incidence(&mut self.incidence)
     }
 }
@@ -56,15 +59,15 @@ impl AppendGraph {
             adjacent: v2,
         });
         self.vertices[v1.0].incidence_count += 1;
-        self.vertices[v1.0].first_incidence = Some(Incidence(self.incidences.len() - 1));
+        self.vertices[v1.0].first_incidence = Some(Edge(self.incidences.len() - 1));
     }
 
-    fn raw_incidences(&self, v: Vertex) -> impl Iterator<Item = (Vertex, Incidence)> {
+    fn raw_incidences(&self, v: Vertex) -> impl Iterator<Item = (Vertex, Edge)> {
         let mut incidence = self.vertices[v.0].first_incidence;
         std::iter::from_fn(move || self.step_incidence(&mut incidence))
     }
 
-    fn step_incidence(&self, incidence: &mut Option<Incidence>) -> Option<(Vertex, Incidence)> {
+    fn step_incidence(&self, incidence: &mut Option<Edge>) -> Option<(Vertex, Edge)> {
         let current = (*incidence)?;
         let entry = self.incidences[current.0];
         *incidence = entry.next;
@@ -80,7 +83,7 @@ impl Default for AppendGraph {
 
 impl GraphTopology for AppendGraph {
     type Vertex = Vertex;
-    type Edge = Incidence;
+    type Edge = Edge;
     type IncidenceCursor = AppendGraphIncidenceCursor;
 
     fn vertex_count(&self) -> usize {
@@ -130,7 +133,7 @@ impl GraphTopology for AppendGraph {
     }
 
     fn edges(&self) -> impl Iterator<Item = Self::Edge> {
-        (0..self.incidences.len()).step_by(2).map(Incidence)
+        (0..self.incidences.len()).step_by(2).map(Edge)
     }
 
     fn incident_edges(&self, v: Self::Vertex) -> impl Iterator<Item = Self::Edge> {
@@ -158,7 +161,7 @@ impl GraphTopology for AppendGraph {
     fn add_edge(&mut self, v1: Self::Vertex, v2: Self::Vertex) -> Self::Edge {
         self.add_incidence(v1, v2);
         self.add_incidence(v2, v1);
-        Incidence(self.incidences.len() - 2)
+        Edge(self.incidences.len() - 2)
     }
 }
 
@@ -175,7 +178,7 @@ mod tests {
         let v1 = graph.add_vertex();
         let v2 = graph.add_vertex();
         let e = graph.add_edge(v1, v2);
-        let f = Incidence(e.0 + 1);
+        let f = Edge(e.0 + 1);
         let (u1, u2) = graph.incident_vertices(f);
         assert!(
             (u1 == v1 && u2 == v2) || (u1 == v2 && u2 == v1),

src/models/graph.rs

@@ -3,9 +3,11 @@ use typed_generational_arena::{Arena, Index};
 use crate::maps::{EdgeMap, VertexMap};
 use crate::traits::{GraphTopology, GraphTopologyDeletion, IncidenceCursor};
 
-type Vertex = Index<VertexIncidenceHeader, usize, usize>;
+pub type Vertex = Index<VertexIncidenceHeader, usize, usize>;
+pub type Edge = Index<IncidenceEntry, usize, usize>;
 
-type Edge = Index<IncidenceEntry, usize, usize>;
+pub type GraphVertexMap<T> = VertexMap<Vertex, T>;
+pub type GraphEdgeMap<T> = EdgeMap<Edge, T>;
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 struct VertexSlot(usize);

src/testing/bfs_testing.rs

@@ -1,3 +1,4 @@
+#[doc(hidden)]
 #[macro_export]
 macro_rules! bfs_tests {
     ($T:ty) => {

src/testing/dfs_testing.rs

@@ -1,3 +1,4 @@
+#[doc(hidden)]
 #[macro_export]
 macro_rules! dfs_tests {
     ($T:ty) => {

src/testing/dijkstra_testing.rs

@@ -1,3 +1,4 @@
+#[doc(hidden)]
 #[macro_export]
 macro_rules! dijkstra_tests {
     ($T:ty) => {

src/testing/find_path_testing.rs

@@ -1,3 +1,4 @@
+#[doc(hidden)]
 #[macro_export]
 macro_rules! find_path_tests {
     ($T:ty) => {
@@ -7,7 +8,7 @@ macro_rules! find_path_tests {
             let mut graph = <$T>::new();
             let v = graph.add_vertex();
             assert_eq!(
-                $crate::algorithms::find_path(&graph, v, v),
+                $crate::algorithms::dfs_find_path(&graph, v, v),
                 Some(vec![]),
                 "path from source to itself should be empty"
             );
@@ -17,7 +18,7 @@ macro_rules! find_path_tests {
         fn find_path_disconnected() {
             let (graph, vertices) = make_test_graph_disconnected();
             assert_eq!(
-                $crate::algorithms::find_path(&graph, vertices[0], vertices[1]),
+                $crate::algorithms::dfs_find_path(&graph, vertices[0], vertices[1]),
                 None,
                 "no path should exist to disconnected vertex"
             );
@@ -30,7 +31,7 @@ macro_rules! find_path_tests {
             let v1 = graph.add_vertex();
             let v2 = graph.add_vertex();
             let e = graph.add_edge(v1, v2);
-            let path = $crate::algorithms::find_path(&graph, v1, v2)
+            let path = $crate::algorithms::dfs_find_path(&graph, v1, v2)
                 .expect("path should exist between adjacent vertices");
             assert_eq!(
                 path.len(),
@@ -43,7 +44,7 @@ macro_rules! find_path_tests {
         #[test]
         fn find_path() {
             let (graph, vertices, _, _) = make_test_graph();
-            let path = $crate::algorithms::find_path(&graph, vertices[0], vertices[9])
+            let path = $crate::algorithms::dfs_find_path(&graph, vertices[0], vertices[9])
                 .expect(&format!(
                     "path should exist between connected vertices {:?} and {:?}",
                     vertices[0], vertices[9]
@@ -57,7 +58,7 @@ macro_rules! find_path_tests {
             let mut graph = <$T>::new();
             let v = graph.add_vertex();
             assert_eq!(
-                $crate::algorithms::find_path_where(&graph, v, |u| u == v),
+                $crate::algorithms::dfs_find_path_where(&graph, v, |u| u == v),
                 Some(vec![]),
                 "path from source to itself should be empty"
             );
@@ -67,7 +68,7 @@ macro_rules! find_path_tests {
         fn find_path_where_disconnected() {
             let (graph, vertices) = make_test_graph_disconnected();
             assert_eq!(
-                $crate::algorithms::find_path_where(&graph, vertices[0], |v| v == vertices[1]),
+                $crate::algorithms::dfs_find_path_where(&graph, vertices[0], |v| v == vertices[1]),
                 None,
                 "no path should exist to disconnected vertex"
             );
@@ -77,7 +78,7 @@ macro_rules! find_path_tests {
         fn find_path_where_no_match() {
             let (graph, vertices, _, _) = make_test_graph();
             assert_eq!(
-                $crate::algorithms::find_path_where(&graph, vertices[0], |_| false),
+                $crate::algorithms::dfs_find_path_where(&graph, vertices[0], |_| false),
                 None,
                 "no path should exist when predicate never matches"
             );
@@ -87,7 +88,7 @@ macro_rules! find_path_tests {
         fn find_path_where() {
             let (graph, vertices, _, _) = make_test_graph();
             let path =
-                $crate::algorithms::find_path_where(&graph, vertices[0], |v| v == vertices[9])
+                $crate::algorithms::dfs_find_path_where(&graph, vertices[0], |v| v == vertices[9])
                     .expect(&format!(
                         "path should exist between connected vertices {:?} and {:?}",
                         vertices[0], vertices[9]

src/testing/graph_topology_testing.rs

@@ -1,3 +1,4 @@
+#[doc(hidden)]
 #[macro_export]
 macro_rules! graph_topology_test_fixtures {
     ($T:ty) => {
@@ -101,6 +102,7 @@ macro_rules! graph_topology_test_fixtures {
     };
 }
 
+#[doc(hidden)]
 #[macro_export]
 macro_rules! graph_topology_tests {
     ($T:ty) => {
@@ -748,6 +750,7 @@ macro_rules! graph_topology_tests {
     };
 }
 
+#[doc(hidden)]
 #[macro_export]
 macro_rules! graph_topology_deletion_tests {
     ($T:ty) => {

src/testing/maps_testing.rs

@@ -1,3 +1,4 @@
+#[doc(hidden)]
 #[macro_export]
 macro_rules! vertex_map_tests {
     ($T:ty) => {
@@ -52,16 +53,16 @@ macro_rules! vertex_map_tests {
             let mut graph = <$T>::new();
             graph.add_vertex();
             let mut map = graph.vertex_map(42);
-            let initial_len = map.len();
+            let initial_len = map.capacity();
             while graph.vertex_capacity() <= initial_len {
                 graph.add_vertex();
             }
             assert!(
-                map.len() < graph.vertex_capacity(),
+                map.capacity() < graph.vertex_capacity(),
                 "precondition: map is stale before sync"
             );
             map.sync(&graph);
-            assert_eq!(map.len(), graph.vertex_capacity());
+            assert_eq!(map.capacity(), graph.vertex_capacity());
         }
 
         #[test]
@@ -78,6 +79,7 @@ macro_rules! vertex_map_tests {
     };
 }
 
+#[doc(hidden)]
 #[macro_export]
 macro_rules! vertex_map_deletion_tests {
     ($T:ty) => {
@@ -107,7 +109,7 @@ macro_rules! vertex_map_deletion_tests {
             let capacity_before = graph.vertex_capacity();
             graph.delete_vertex(v2);
             map.sync(&graph);
-            assert_eq!(map.len(), capacity_before);
+            assert_eq!(map.capacity(), capacity_before);
             assert_eq!(map[v1], 5);
         }
 
@@ -130,6 +132,7 @@ macro_rules! vertex_map_deletion_tests {
     };
 }
 
+#[doc(hidden)]
 #[macro_export]
 macro_rules! edge_map_tests {
     ($T:ty) => {
@@ -194,16 +197,16 @@ macro_rules! edge_map_tests {
             let v2 = graph.add_vertex();
             graph.add_edge(v1, v2);
             let mut map = graph.edge_map(42);
-            let initial_len = map.len();
+            let initial_len = map.capacity();
             while graph.edge_capacity() <= initial_len {
                 graph.add_edge(v1, v2);
             }
             assert!(
-                map.len() < graph.edge_capacity(),
+                map.capacity() < graph.edge_capacity(),
                 "precondition: map is stale before sync"
             );
             map.sync(&graph);
-            assert_eq!(map.len(), graph.edge_capacity());
+            assert_eq!(map.capacity(), graph.edge_capacity());
         }
 
         #[test]
@@ -222,6 +225,7 @@ macro_rules! edge_map_tests {
     };
 }
 
+#[doc(hidden)]
 #[macro_export]
 macro_rules! edge_map_deletion_tests {
     ($T:ty) => {
@@ -255,7 +259,7 @@ macro_rules! edge_map_deletion_tests {
             let capacity_before = graph.edge_capacity();
             graph.delete_edge(e2);
             map.sync(&graph);
-            assert_eq!(map.len(), capacity_before);
+            assert_eq!(map.capacity(), capacity_before);
             assert_eq!(map[e1], 5);
         }
 

tests/bfs.rs

@@ -1,12 +1,12 @@
 mod append_graph_tests {
-    use grapherity::models::append_graph::AppendGraph;
+    use grapherity::models::AppendGraph;
 
     grapherity::graph_topology_test_fixtures!(AppendGraph);
     grapherity::bfs_tests!(AppendGraph);
 }
 
 mod graph_tests {
-    use grapherity::models::graph::Graph;
+    use grapherity::models::Graph;
 
     grapherity::graph_topology_test_fixtures!(Graph);
     grapherity::bfs_tests!(Graph);

tests/dfs.rs

@@ -1,12 +1,12 @@
 mod append_graph_tests {
-    use grapherity::models::append_graph::AppendGraph;
+    use grapherity::models::AppendGraph;
 
     grapherity::graph_topology_test_fixtures!(AppendGraph);
     grapherity::dfs_tests!(AppendGraph);
 }
 
 mod graph_tests {
-    use grapherity::models::graph::Graph;
+    use grapherity::models::Graph;
 
     grapherity::graph_topology_test_fixtures!(Graph);
     grapherity::dfs_tests!(Graph);

tests/dijkstra.rs

@@ -1,12 +1,12 @@
 mod append_graph_tests {
-    use grapherity::models::append_graph::AppendGraph;
+    use grapherity::models::AppendGraph;
 
     grapherity::graph_topology_test_fixtures!(AppendGraph);
     grapherity::dijkstra_tests!(AppendGraph);
 }
 
 mod graph_tests {
-    use grapherity::models::graph::Graph;
+    use grapherity::models::Graph;
 
     grapherity::graph_topology_test_fixtures!(Graph);
     grapherity::dijkstra_tests!(Graph);

tests/find_path.rs

@@ -1,12 +1,12 @@
 mod append_graph_tests {
-    use grapherity::models::append_graph::AppendGraph;
+    use grapherity::models::AppendGraph;
 
     grapherity::graph_topology_test_fixtures!(AppendGraph);
     grapherity::find_path_tests!(AppendGraph);
 }
 
 mod graph_tests {
-    use grapherity::models::graph::Graph;
+    use grapherity::models::Graph;
 
     grapherity::graph_topology_test_fixtures!(Graph);
     grapherity::find_path_tests!(Graph);

tests/maps.rs

@@ -1,24 +1,24 @@
 mod append_graph_vertex_map_tests {
-    use grapherity::models::append_graph::AppendGraph;
+    use grapherity::models::AppendGraph;
 
     grapherity::vertex_map_tests!(AppendGraph);
 }
 
 mod append_graph_edge_map_tests {
-    use grapherity::models::append_graph::AppendGraph;
+    use grapherity::models::AppendGraph;
 
     grapherity::edge_map_tests!(AppendGraph);
 }
 
 mod graph_vertex_map_tests {
-    use grapherity::models::graph::Graph;
+    use grapherity::models::Graph;
 
     grapherity::vertex_map_tests!(Graph);
     grapherity::vertex_map_deletion_tests!(Graph);
 }
 
 mod graph_edge_map_tests {
-    use grapherity::models::graph::Graph;
+    use grapherity::models::Graph;
 
     grapherity::edge_map_tests!(Graph);
     grapherity::edge_map_deletion_tests!(Graph);