go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/lucicfg/interner.go (about)

     1  // Copyright 2022 The LUCI Authors.
     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 lucicfg
    16  
    17  // stringInterner can be used to save memory by interning strings.
    18  type stringInterner map[string]string
    19  
    20  // internString returns an interned copy of `s`.
    21  func (si stringInterner) internString(s string) string {
    22  	if interned, ok := si[s]; ok {
    23  		return interned
    24  	}
    25  	si[s] = s
    26  	return s
    27  }