github.com/dolthub/dolt/go@v0.40.5-0.20240520175717-68db7794bea6/store/val/prefix.go (about) 1 // Copyright 2023 Dolthub, Inc. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package val 16 17 // TrimValueToPrefixLength trims |value| to |prefixLength| if it is longer 18 // and if it is either a []byte or string type. If |prefixLength| is zero, 19 // then |value| will be returned without being trimmed. 20 func TrimValueToPrefixLength(value interface{}, prefixLength uint16) interface{} { 21 if prefixLength == 0 { 22 return value 23 } 24 25 switch v := value.(type) { 26 case string: 27 if prefixLength > uint16(len(v)) { 28 prefixLength = uint16(len(v)) 29 } 30 value = v[:prefixLength] 31 case []uint8: 32 if prefixLength > uint16(len(v)) { 33 prefixLength = uint16(len(v)) 34 } 35 value = v[:prefixLength] 36 } 37 38 return value 39 }