117 lines
2.6 KiB
Go
117 lines
2.6 KiB
Go
// Copyright 2021 Google Inc. All rights reserved.
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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 blueprint
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import (
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"sort"
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)
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func abs(a int) int {
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if a < 0 {
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return -a
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}
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return a
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}
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// This implementation is written to be recursive, because
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// we know Soong names are short, so we shouldn't hit the stack
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// depth. Also, the buffer is indexed this way so that new
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// allocations aren't needed.
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func levenshtein(a, b string, ai, bi, max int, buf [][]int) int {
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if max == 0 {
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return 0
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}
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if ai >= len(a) {
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return len(b) - bi
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}
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if bi >= len(b) {
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return len(a) - ai
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}
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if buf[bi][ai] != 0 {
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return buf[bi][ai]
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}
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if abs(len(a)-len(b)) >= max {
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return max
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}
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var res = max
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if a[ai] == b[bi] {
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res = levenshtein(a, b, ai+1, bi+1, max, buf)
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} else {
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if c := levenshtein(a, b, ai+1, bi+1, max-1, buf); c < res {
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res = c // replace
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}
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if c := levenshtein(a, b, ai+1, bi, max-1, buf); c < res {
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res = c // delete from a
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}
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if c := levenshtein(a, b, ai, bi+1, max-1, buf); c < res {
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res = c // delete from b
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}
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res += 1
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}
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buf[bi][ai] = res
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return res
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}
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func stringIn(arr []string, str string) bool {
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for _, a := range arr {
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if a == str {
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return true
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}
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}
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return false
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}
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func namesLike(name string, unlike string, moduleGroups []*moduleGroup) []string {
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const kAllowedDifferences = 10
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buf := make([][]int, len(name)+kAllowedDifferences)
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for i := range buf {
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buf[i] = make([]int, len(name))
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}
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var best []string
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bestVal := kAllowedDifferences + 1
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for _, group := range moduleGroups {
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other := group.name
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if other == unlike {
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continue
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}
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l := levenshtein(name, other, 0, 0, kAllowedDifferences, buf)
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// fmt.Printf("levenshtein %q %q %d\n", name, other, l)
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// slightly better to use a min-heap
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if l == 0 {
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// these are the same, so it must be in a different namespace
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// ignore...
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} else if l < bestVal {
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bestVal = l
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best = []string{other}
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} else if l == bestVal && !stringIn(best, other) {
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best = append(best, other)
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}
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// zero buffer once used
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for _, v := range buf {
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for j := range v {
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v[j] = 0
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}
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}
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}
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sort.Strings(best)
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return best
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}
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