github.com/lmars/docker@v1.6.0-rc2/pkg/version/version.go (about)

     1  package version
     2  
     3  import (
     4  	"strconv"
     5  	"strings"
     6  )
     7  
     8  // Version provides utility methods for comparing versions.
     9  type Version string
    10  
    11  func (v Version) compareTo(other Version) int {
    12  	var (
    13  		currTab  = strings.Split(string(v), ".")
    14  		otherTab = strings.Split(string(other), ".")
    15  	)
    16  
    17  	max := len(currTab)
    18  	if len(otherTab) > max {
    19  		max = len(otherTab)
    20  	}
    21  	for i := 0; i < max; i++ {
    22  		var currInt, otherInt int
    23  
    24  		if len(currTab) > i {
    25  			currInt, _ = strconv.Atoi(currTab[i])
    26  		}
    27  		if len(otherTab) > i {
    28  			otherInt, _ = strconv.Atoi(otherTab[i])
    29  		}
    30  		if currInt > otherInt {
    31  			return 1
    32  		}
    33  		if otherInt > currInt {
    34  			return -1
    35  		}
    36  	}
    37  	return 0
    38  }
    39  
    40  // LessThan checks if a version is less than another version
    41  func (v Version) LessThan(other Version) bool {
    42  	return v.compareTo(other) == -1
    43  }
    44  
    45  // LessThanOrEqualTo checks if a version is less than or equal to another
    46  func (v Version) LessThanOrEqualTo(other Version) bool {
    47  	return v.compareTo(other) <= 0
    48  }
    49  
    50  // GreaterThan checks if a version is greater than another one
    51  func (v Version) GreaterThan(other Version) bool {
    52  	return v.compareTo(other) == 1
    53  }
    54  
    55  // GreaterThanOrEqualTo checks ia version is greater than or equal to another
    56  func (v Version) GreaterThanOrEqualTo(other Version) bool {
    57  	return v.compareTo(other) >= 0
    58  }
    59  
    60  // Equal checks if a version is equal to another
    61  func (v Version) Equal(other Version) bool {
    62  	return v.compareTo(other) == 0
    63  }