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gonum.org/v1/gonum / graph / traverse

Package traverse

v0.7.0
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Published: Feb 26, 2020 | License: BSD-3-Clause | Module: gonum.org/v1/gonum

Overview

Package traverse provides basic graph traversal primitives.

Index

Package Files

type BreadthFirst

type BreadthFirst struct {
	// Visit is called on all nodes on their first visit.
	Visit func(graph.Node)

	// Traverse is called on all edges that may be traversed
	// during the walk. This includes edges that would hop to
	// an already visited node.
	//
	// The value returned by Traverse determines whether
	// an edge can be traversed during the walk.
	Traverse func(graph.Edge) bool
	// contains filtered or unexported fields
}

BreadthFirst implements stateful breadth-first graph traversal.

func (*BreadthFirst) Reset

func (b *BreadthFirst) Reset()

Reset resets the state of the traverser for reuse.

func (*BreadthFirst) Visited

func (b *BreadthFirst) Visited(n graph.Node) bool

Visited returned whether the node n was visited during a traverse.

func (*BreadthFirst) Walk

func (b *BreadthFirst) Walk(g Graph, from graph.Node, until func(n graph.Node, d int) bool) graph.Node

Walk performs a breadth-first traversal of the graph g starting from the given node, depending on the Traverse field and the until parameter if they are non-nil. The traversal follows edges for which Traverse(edge) is true and returns the first node for which until(node, depth) is true. During the traversal, if the Visit field is non-nil, it is called with each node the first time it is visited.

func (*BreadthFirst) WalkAll

func (b *BreadthFirst) WalkAll(g graph.Undirected, before, after func(), during func(graph.Node))

WalkAll calls Walk for each unvisited node of the graph g using edges independent of their direction. The functions before and after are called prior to commencing and after completing each walk if they are non-nil respectively. The function during is called on each node as it is traversed.

type DepthFirst

type DepthFirst struct {
	// Visit is called on all nodes on their first visit.
	Visit func(graph.Node)

	// Traverse is called on all edges that may be traversed
	// during the walk. This includes edges that would hop to
	// an already visited node.
	//
	// The value returned by Traverse determines whether an
	// edge can be traversed during the walk.
	Traverse func(graph.Edge) bool
	// contains filtered or unexported fields
}

DepthFirst implements stateful depth-first graph traversal.

func (*DepthFirst) Reset

func (d *DepthFirst) Reset()

Reset resets the state of the traverser for reuse.

func (*DepthFirst) Visited

func (d *DepthFirst) Visited(n graph.Node) bool

Visited returned whether the node n was visited during a traverse.

func (*DepthFirst) Walk

func (d *DepthFirst) Walk(g Graph, from graph.Node, until func(graph.Node) bool) graph.Node

Walk performs a depth-first traversal of the graph g starting from the given node, depending on the Traverse field and the until parameter if they are non-nil. The traversal follows edges for which Traverse(edge) is true and returns the first node for which until(node) is true. During the traversal, if the Visit field is non-nil, it is called with each node the first time it is visited.

func (*DepthFirst) WalkAll

func (d *DepthFirst) WalkAll(g graph.Undirected, before, after func(), during func(graph.Node))

WalkAll calls Walk for each unvisited node of the graph g using edges independent of their direction. The functions before and after are called prior to commencing and after completing each walk if they are non-nil respectively. The function during is called on each node as it is traversed.

type Graph

type Graph interface {
	// From returns all nodes that can be reached directly
	// from the node with the given ID.
	From(id int64) graph.Nodes

	// Edge returns the edge from u to v, with IDs uid and vid,
	// if such an edge exists and nil otherwise. The node v
	// must be directly reachable from u as defined by
	// the From method.
	Edge(uid, vid int64) graph.Edge
}

Graph is the subset of graph.Graph necessary for graph traversal.

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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