github.com/coreos/mantle@v0.13.0/lang/natsort/sort.go (about)

     1  // Copyright 2016 CoreOS, 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 natsort
    16  
    17  import (
    18  	"sort"
    19  )
    20  
    21  // Less determines if a naturally comes before b. Unlike Compare it will
    22  // fall back to a normal string comparison which considers spaces if the
    23  // two would otherwise be equal. That helps ensure the stability of sorts.
    24  func Less(a, b string) bool {
    25  	if r := Compare(a, b); r == 0 {
    26  		return a < b
    27  	} else {
    28  		return r < 0
    29  	}
    30  }
    31  
    32  // Strings natural sorts a slice of strings.
    33  func Strings(s []string) {
    34  	sort.Slice(s, func(i, j int) bool {
    35  		return Less(s[i], s[j])
    36  	})
    37  }
    38  
    39  // StringsAreSorted tests whether a slice of strings is natural sorted.
    40  func StringsAreSorted(s []string) bool {
    41  	return sort.SliceIsSorted(s, func(i, j int) bool {
    42  		return Less(s[i], s[j])
    43  	})
    44  }