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common_prefix.go
36 lines (33 loc) · 1.04 KB
/
common_prefix.go
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// Copyright (c) 2017 Tigera, Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package stringutils
func CommonPrefix(strs []string) string {
if len(strs) == 0 {
return ""
}
candidatePrefix := strs[0]
for _, s := range strs[1:] {
candidatePrefix = commonPrefixTwoStrings(candidatePrefix, s)
}
return candidatePrefix
}
func commonPrefixTwoStrings(a, b string) string {
commonLen := 0
for ; commonLen < len(a) && commonLen < len(b); commonLen++ {
if a[commonLen] != b[commonLen] {
break
}
}
return a[:commonLen]
}