github.com/google/osv-scalibr@v0.4.1/semantic/version-rubygems.go (about)

     1  // Copyright 2025 Google LLC
     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 semantic
    16  
    17  import (
    18  	"strings"
    19  )
    20  
    21  func canonicalizeRubyGemVersion(str string) string {
    22  	var res strings.Builder
    23  
    24  	checkPrevious := false
    25  	previousWasDigit := true
    26  
    27  	for _, c := range str {
    28  		if c == 46 {
    29  			checkPrevious = false
    30  			res.WriteString(".")
    31  
    32  			continue
    33  		}
    34  
    35  		isDigit := isASCIIDigit(c)
    36  
    37  		if checkPrevious && previousWasDigit != isDigit {
    38  			res.WriteString(".")
    39  		}
    40  
    41  		res.WriteRune(c)
    42  
    43  		previousWasDigit = isDigit
    44  		checkPrevious = true
    45  	}
    46  
    47  	return res.String()
    48  }
    49  
    50  func groupSegments(segs []string) (numbers []string, build []string) {
    51  	for _, seg := range segs {
    52  		_, err := convertToBigInt(seg)
    53  
    54  		if len(build) > 0 || err != nil {
    55  			build = append(build, seg)
    56  
    57  			continue
    58  		}
    59  
    60  		numbers = append(numbers, seg)
    61  	}
    62  
    63  	return numbers, build
    64  }
    65  
    66  func removeZeros(segs []string) []string {
    67  	i := len(segs) - 1
    68  
    69  	for i >= 0 {
    70  		if segs[i] != "0" {
    71  			i++
    72  
    73  			break
    74  		}
    75  
    76  		i--
    77  	}
    78  
    79  	return segs[:max(i, 0)]
    80  }
    81  
    82  func canonicalSegments(segs []string) (canSegs []string) {
    83  	numbers, build := groupSegments(segs)
    84  
    85  	return append(removeZeros(numbers), removeZeros(build)...)
    86  }
    87  
    88  func compareRubyGemsComponents(a, b []string) int {
    89  	numberOfComponents := max(len(a), len(b))
    90  
    91  	for i := range numberOfComponents {
    92  		as := fetch(a, i, "0")
    93  		bs := fetch(b, i, "0")
    94  
    95  		ai, aErr := convertToBigInt(as)
    96  		bi, bErr := convertToBigInt(bs)
    97  
    98  		switch {
    99  		case aErr == nil && bErr == nil:
   100  			if diff := ai.Cmp(bi); diff != 0 {
   101  				return diff
   102  			}
   103  		case aErr != nil && bErr != nil:
   104  			if diff := strings.Compare(as, bs); diff != 0 {
   105  				return diff
   106  			}
   107  		case aErr == nil:
   108  			return +1
   109  		default:
   110  			return -1
   111  		}
   112  	}
   113  
   114  	return 0
   115  }
   116  
   117  type rubyGemsVersion struct {
   118  	Original string
   119  	Segments []string
   120  }
   121  
   122  func parseRubyGemsVersion(str string) rubyGemsVersion {
   123  	return rubyGemsVersion{
   124  		str,
   125  		canonicalSegments(strings.Split(canonicalizeRubyGemVersion(str), ".")),
   126  	}
   127  }
   128  
   129  func (v rubyGemsVersion) compare(w rubyGemsVersion) int {
   130  	return compareRubyGemsComponents(v.Segments, w.Segments)
   131  }
   132  
   133  func (v rubyGemsVersion) CompareStr(str string) (int, error) {
   134  	return v.compare(parseRubyGemsVersion(str)), nil
   135  }