go-tree

A generic unbalanced doubly-linked tree implementation, where you can define which node will be added to each node.

Installation

• With go get:

go get -u github.com/johnfercher/go-tree

Contributing

Command	Description	Dependencies
make build	Build project	go
make test	Run unit tests	go
make fmt	Format files	gofmt, gofumpt and goimports
make lint	Check files	golangci-lint and goreportcard-cli
make dod	(Definition of Done) Format files and check files	Same as make build, make test, make fmt and make lint
make install	Install all dependencies	go, curl and git
make examples	Run all examples	go

Features

Node

• NewNode
• AddNext
• Backtrack
• Get
• GetNexts
• GetPrevious
• GetStructure
• IsLeaf
• IsRoot
• Filter

Tree

• New
• Add
• AddRoot
• Backtrack
• Get
• GetRoot
• GetStructure
• Filter

Example

package main

import (
	"fmt"
	"github.com/johnfercher/go-tree/node"

	"github.com/johnfercher/go-tree/tree"
)

// nolint:gomnd,gocritic
func main() {
	tr := tree.New[string]()

	tr.AddRoot(node.New("0.0").WithID(0))

	tr.Add(0, node.New("0.1").WithID(1))
	tr.Add(0, node.New("0.2").WithID(2))

	tr.Add(1, node.New("1.3").WithID(3))
	tr.Add(1, node.New("1.4").WithID(4))

	tr.Add(2, node.New("2.5").WithID(5))
	tr.Add(2, node.New("2.6").WithID(6))

	root, ok := tr.GetRoot()
	fmt.Println(ok)             // true
	fmt.Println(root.GetData()) // 0.0

	node, ok := tr.Get(3)
	fmt.Println(ok)             // true
	fmt.Println(node.GetData()) // 1.3

	structure, ok := tr.GetStructure()
	fmt.Println(ok)        // true
	fmt.Println(structure) // (NULL) -> (0), (0) -> (1),  (1) -> (3),  (1) -> (4),  (0) -> (2),  (2) -> (5),  (2) -> (6)

	nodes, ok := tr.Backtrack(6)
	fmt.Println(ok) // true
	for _, node := range nodes {
		fmt.Println(node.GetData()) // 2.6; 0.2; 0.0
	}
}