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40 lines
1.2 KiB
Go
40 lines
1.2 KiB
Go
/*
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Copyright 2013 The Perkeep Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package strutil
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var internStr = map[string]string{}
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// RegisterCommonString adds common strings to the interned string
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// table. This should be called during init from the main
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// goroutine, not later at runtime.
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func RegisterCommonString(s ...string) {
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for _, v := range s {
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internStr[v] = v
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}
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}
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// StringFromBytes returns string(v), minimizing copies for common values of v
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// as previously registered with RegisterCommonString.
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func StringFromBytes(v []byte) string {
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// In Go 1.3, this string conversion in the map lookup does not allocate
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// to make a new string. We depend on Go 1.3, so this is always free:
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if s, ok := internStr[string(v)]; ok {
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return s
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}
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return string(v)
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}
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