kythe.io@v0.0.68-0.20240422202219-7225dbc01741/kythe/go/util/vnameutil/order.go (about)

     1  /*
     2   * Copyright 2017 The Kythe Authors. All rights reserved.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *   http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package vnameutil
    18  
    19  import (
    20  	"strings"
    21  
    22  	spb "kythe.io/kythe/proto/storage_go_proto"
    23  )
    24  
    25  // Compare reports the relative order of two vnames, returning -1 if a < b, 0
    26  // if a == b, and 1 if a > b.
    27  func Compare(a, b *spb.VName) int {
    28  	for _, v := range [...]struct{ ap, bp *string }{
    29  		{&a.Corpus, &b.Corpus},
    30  		{&a.Language, &b.Language},
    31  		{&a.Path, &b.Path},
    32  		{&a.Root, &b.Root},
    33  		{&a.Signature, &b.Signature},
    34  	} {
    35  		if n := strings.Compare(*v.ap, *v.bp); n != 0 {
    36  			return n
    37  		}
    38  	}
    39  	return 0
    40  }