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Description

An implementation of the Levenshtein distance for Golang

Programming language: Go
License: MIT License
Tags: Math     Algorithms     Sequences    

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README

levenshtein

An implementation of the Levenshtein distance for Golang

Sources

Levenshtein distance

Golang

Install

go get github.com/gitchander/levenshtein

Examples

package main

import (
    "fmt"

    lev "github.com/gitchander/levenshtein"
)

func main() {
    var (
        a = "exponential"
        b = "polynomial"
    )
    distance := lev.Strings(a, b)
    fmt.Printf("the levenshtein distance between %q and %q = %d\n", a, b, distance)
}

result:

the levenshtein distance between "exponential" and "polynomial" = 6

Example the distance by words:

package main

import (
    "fmt"
    "strings"

    lev "github.com/gitchander/levenshtein"
)

func main() {
    var (
        line1 = "one two three four"
        line2 = "one two three"
    )
    var (
        a = strings.Split(line1, " ")
        b = strings.Split(line2, " ")
    )
    distance := lev.Distance(lev.StringSlices{a, b})
    fmt.Printf("the levenshtein distance between %q and %q = %d\n", a, b, distance)
}

result:

the levenshtein distance between ["one" "two" "three" "four"] and ["one" "two" "three"] = 1

Example with print matrix:

package main

import (
    "fmt"

    lev "github.com/gitchander/levenshtein"
)

func main() {
    var (
        a = []rune("sitting")
        b = []rune("kitten")
    )
    costs := lev.DefaultCosts
    fmt.Print(lev.PrintableMatrix(costs, a, b, ""))
}

result:

. . k i t t e n 
. 0 1 2 3 4 5 6 
s 1 1 2 3 4 5 6 
i 2 2 1 2 3 4 5 
t 3 3 2 1 2 3 4 
t 4 4 3 2 1 2 3 
i 5 5 4 3 2 2 3 
n 6 6 5 4 3 3 2 
g 7 7 6 5 4 4 3

Example the distance by interfaces:

package main

import (
    "fmt"

    lev "github.com/gitchander/levenshtein"
)

func main() {
    var (
        a = []Person{{"one", 1}, {"two", 2}, {"three", 3}, {"four", 4}}
        b = []Person{{"one", 1}, {"two", 2}, {"three", 3}}
    )
    distance := lev.Distance(PersonSlices{a, b})
    fmt.Printf("the levenshtein distance = %d\n", distance)
}

type Person struct {
    Name string
    Age  int
}

type PersonSlices [2][]Person

var _ lev.Interface = PersonSlices{}

func (p PersonSlices) Len(k int) int {
    return len(p[k])
}

func (p PersonSlices) Match(i, j int) bool {
    return p[0][i] == p[1][j]
}

result:

the levenshtein distance = 1