66 lines
1.2 KiB
Go
66 lines
1.2 KiB
Go
// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package text
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func Levenshtein(one, two string) int {
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var cost, olddiag, lastdiag int
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s1 := []rune(one)
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s2 := []rune(two)
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l1 := len(s1)
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l2 := len(s2)
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column := make([]int, l1+1)
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for y := 1; y <= l1; y++ {
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column[y] = y
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}
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for x := 1; x <= l2; x++ {
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column[0] = x
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lastdiag = x - 1
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for y := 1; y <= l1; y++ {
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olddiag = column[y]
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cost = 0
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if s1[y-1] != s2[x-1] {
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cost = 1
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}
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column[y] = min(
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column[y]+1,
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column[y-1]+1,
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lastdiag+cost,
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)
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lastdiag = olddiag
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}
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}
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return column[l1]
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}
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func min(a, b, c int) int {
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if a < b {
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if a < c {
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return a
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}
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} else {
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if b < c {
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return b
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}
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}
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return c
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}
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