traverse

package
v0.19.2-0...-3168bd4 Latest Latest
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Published: Sep 6, 2017 License: Apache-2.0, BSD-3-Clause Imports: 3 Imported by: 0

Documentation

Overview

Package traverse provides basic graph traversal primitives.

Package traverse provides basic graph traversal primitives.

Index

Constants

This section is empty.

Variables

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Functions

This section is empty.

Types

type BreadthFirst

type BreadthFirst struct {
	EdgeFilter func(graph.Edge) bool
	Visit      func(u, v graph.Node)
	// 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.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 the EdgeFilter field and the until parameter if they are non-nil. The traversal follows edges for which EdgeFilter(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 the nodes joined by each followed edge.

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 {
	EdgeFilter func(graph.Edge) bool
	Visit      func(u, v graph.Node)
	// 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.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 the EdgeFilter field and the until parameter if they are non-nil. The traversal follows edges for which EdgeFilter(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 the nodes joined by each followed edge.

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 VisitableGraph

type VisitableGraph interface {
	graph.Graph

	// VisitFrom invokes visitor with all nodes that can be reached directly from the given node.
	// If visitor returns false, visiting is short-circuited.
	VisitFrom(from graph.Node, visitor func(graph.Node) (shouldContinue bool))
}

VisitableGraph

type VisitingDepthFirst

type VisitingDepthFirst struct {
	EdgeFilter func(graph.Edge) bool
	Visit      func(u, v graph.Node)
	// contains filtered or unexported fields
}

VisitingDepthFirst implements stateful depth-first graph traversal on a visitable graph.

func (*VisitingDepthFirst) Reset

func (d *VisitingDepthFirst) Reset()

Reset resets the state of the traverser for reuse.

func (*VisitingDepthFirst) Visited

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

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

func (*VisitingDepthFirst) Walk

func (d *VisitingDepthFirst) Walk(g VisitableGraph, 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 the EdgeFilter field and the until parameter if they are non-nil. The traversal follows edges for which EdgeFilter(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 the nodes joined by each followed edge.

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