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graph_test.go
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graph_test.go
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package graphman
import "fmt"
func ExampleGraph_ConnectedSubgraphs() {
graph := New()
// component 1
graph.AddEdge("A", "B")
graph.AddEdge("B", "C")
graph.AddEdge("C", "D")
graph.AddEdge("D", "A")
// component 2
graph.AddEdge("E", "E")
// component 3
graph.AddEdge("F", "G")
graph.AddEdge("G", "H")
graph.AddEdge("G", "I")
graph.AddEdge("H", "J")
graph.AddEdge("I", "J")
graph.AddEdge("J", "K")
for _, subgraph := range graph.ConnectedSubgraphs() {
fmt.Println(subgraph, subgraph.vertices)
}
// Output:
// {(D,A),(A,B),(B,C),(C,D)} {A,B,C,D}
// {(E,E)} {E}
// {(F,G),(G,H),(G,I),(H,J),(I,J),(J,K)} {F,G,H,J,K,I}
}
func ExampleGraph_simple() {
graph := New()
graph.AddVertex("A")
graph.AddVertex("B")
graph.AddVertex("C")
graph.AddVertex("D")
graph.AddVertex("E")
graph.AddVertex("F")
graph.AddEdge("A", "B")
graph.AddEdge("B", "C")
graph.AddEdge("E", "F")
fmt.Println(graph)
// Output: {(A,B),(B,C),(E,F),D}
}
func ExampleGraph_components() {
graph := New()
// component 1: loop
graph.AddEdge("A", "B")
graph.AddEdge("B", "C")
graph.AddEdge("C", "D")
graph.AddEdge("D", "A")
// component 2: standard
graph.AddEdge("L", "M")
graph.AddEdge("M", "N")
graph.AddEdge("M", "O")
graph.AddEdge("M", "P")
graph.AddEdge("N", "Q")
graph.AddEdge("O", "Q")
graph.AddEdge("P", "Q")
graph.AddEdge("Q", "R")
// component 3: self loop
graph.AddEdge("Z", "Z")
// component 4: reverse (sorted string)
graph.AddEdge("Y", "X")
graph.AddEdge("X", "W")
graph.AddEdge("W", "V")
graph.AddEdge("V", "U")
for _, couple := range [][2]string{
{"A", "D"}, // using the loop from component 1
{"B", "A"}, // same
{"A", "L"}, // two components
{"L", "R"}, // through all the component 2
{"Z", "Z"}, // self loop
{"Y", "U"}, // reverse sorted string
} {
fmt.Printf("couple %s-%s:\n", couple[0], couple[1])
for _, path := range graph.FindAllPaths(couple[0], couple[1]) {
fmt.Println("-", path)
}
path, dist := graph.FindShortestPath(couple[0], couple[1])
fmt.Println("shortest:", path, dist)
fmt.Println()
}
// Output:
// couple A-D:
// - (A,B,C,D)
// shortest: (A,B,C,D) 3
//
// couple B-A:
// - (B,C,D,A)
// shortest: (B,C,D,A) 3
//
// couple A-L:
// shortest: [INVALID] -1
//
// couple L-R:
// - (L,M,N,Q,R)
// - (L,M,O,Q,R)
// - (L,M,P,Q,R)
// shortest: (L,M,N,Q,R) 4
//
// couple Z-Z:
// - (Z,Z)
// shortest: () 0
//
// couple Y-U:
// - (Y,X,W,V,U)
// shortest: (Y,X,W,V,U) 4
}
func ExampleGraph_FindAllPaths() {
graph := New()
graph.AddEdge("G", "H")
graph.AddEdge("A", "B")
graph.AddEdge("A", "B")
graph.AddEdge("F", "H")
graph.AddEdge("A", "C")
graph.AddEdge("B", "E")
graph.AddEdge("B", "G")
graph.AddEdge("C", "F")
graph.AddEdge("D", "H")
graph.AddEdge("A", "D")
graph.AddEdge("E", "G")
graph.AddEdge("E", "H")
graph.AddEdge("F", "G")
for _, path := range graph.FindAllPaths("A", "H") {
fmt.Println(path)
}
fmt.Println()
path, dist := graph.FindShortestPath("A", "H")
fmt.Printf("shortest (distance=%d): %s\n", dist, path)
// Output:
// (A,B,E,G,H)
// (A,B,E,G,H)
// (A,B,E,H)
// (A,B,E,H)
// (A,B,G,H)
// (A,B,G,H)
// (A,C,F,G,H)
// (A,C,F,H)
// (A,D,H)
//
// shortest (distance=2): (A,D,H)
}
func ExampleGraph_complex() {
graph := New()
graph.AddVertex("A", Attrs{"hello": "world"}) // create a vertex with attributes
graph.AddVertex("B") // create an empty vertex
graph.AddVertex("temp") // create a vertex that we will delete later
graph.AddVertex("isolated") // create a vertex that won't have any edge
graph.AddEdge("A", "B") // connect existing vertices A and B
graph.AddEdge("B", "C") // connect existing vertex A with newly created vertex C
graph.RemoveVertex("temp")
fmt.Println(graph)
// Output: {(A,B),(B,C),isolated}
}
func ExampleGraph_big() {
graph := New()
amount := 100
for i := 0; i <= amount; i++ {
graph.AddVertex(fmt.Sprintf("%d", i))
}
for i := 0; i <= amount-1; i++ {
graph.AddEdge(
fmt.Sprintf("%d", i),
fmt.Sprintf("%d", i+1),
)
}
fmt.Println(graph)
path, dist := graph.FindShortestPath("0", "100")
fmt.Println("0-100:", path, dist)
// Output:
// {(0,1),(1,2),(2,3),(3,4),(4,5),(5,6),(6,7),(7,8),(8,9),(9,10),(10,11),(11,12),(12,13),(13,14),(14,15),(15,16),(16,17),(17,18),(18,19),(19,20),(20,21),(21,22),(22,23),(23,24),(24,25),(25,26),(26,27),(27,28),(28,29),(29,30),(30,31),(31,32),(32,33),(33,34),(34,35),(35,36),(36,37),(37,38),(38,39),(39,40),(40,41),(41,42),(42,43),(43,44),(44,45),(45,46),(46,47),(47,48),(48,49),(49,50),(50,51),(51,52),(52,53),(53,54),(54,55),(55,56),(56,57),(57,58),(58,59),(59,60),(60,61),(61,62),(62,63),(63,64),(64,65),(65,66),(66,67),(67,68),(68,69),(69,70),(70,71),(71,72),(72,73),(73,74),(74,75),(75,76),(76,77),(77,78),(78,79),(79,80),(80,81),(81,82),(82,83),(83,84),(84,85),(85,86),(86,87),(87,88),(88,89),(89,90),(90,91),(91,92),(92,93),(93,94),(94,95),(95,96),(96,97),(97,98),(98,99),(99,100)}
// 0-100: (0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100) 100
}
func ExampleGraph_Human() {
graph := New()
graph.AddEdge("G", "H")
graph.AddEdge("A", "B")
graph.AddEdge("A", "B")
graph.AddEdge("F", "H")
graph.AddEdge("A", "C")
graph.AddEdge("B", "E")
graph.AddEdge("B", "G")
graph.AddEdge("C", "F")
graph.AddEdge("D", "H")
graph.AddEdge("A", "D")
graph.AddEdge("E", "G")
graph.AddEdge("E", "H")
graph.AddEdge("F", "G")
graph.AddVertex("I")
graph.AddVertex("J")
graph.AddVertex("K")
fmt.Println(graph.Human())
// Output:
// * A
// * (A,B)
// * (A,B)
// * (A,C)
// * (A,D)
// * B
// * (A,B)
// * (A,B)
// * (B,E)
// * (B,G)
// * C
// * (A,C)
// * (C,F)
// * D
// * (A,D)
// * (D,H)
// * E
// * (B,E)
// * (E,G)
// * (E,H)
// * F
// * (C,F)
// * (F,H)
// * (F,G)
// * G
// * (B,G)
// * (E,G)
// * (F,G)
// * (G,H)
// * H
// * (G,H)
// * (F,H)
// * (D,H)
// * (E,H)
// * I
// * J
// * K
}