Add lexicographic versioning scheme

src/univers/version_range.py

@@ -1201,6 +1201,11 @@ class NoneVersionRange(VersionRange):
     version_class = versions.NoneVersion
 
 
+class LexicographicVersionRange(VersionRange):
+    scheme = "lexicographic"
+    version_class = versions.LexicographicVersion
+
+
 def from_gitlab_native(gitlab_scheme, string):
     purl_scheme = gitlab_scheme
     if gitlab_scheme not in PURL_TYPE_BY_GITLAB_SCHEME.values():
@@ -1446,6 +1451,7 @@ def build_range_from_snyk_advisory_string(scheme: str, string: Union[str, List])
     "all": AllVersionRange,
     "none": NoneVersionRange,
     "intdot": IntdotVersionRange,
+    "lexicographic": LexicographicVersionRange,
 }
 
 PURL_TYPE_BY_GITLAB_SCHEME = {

src/univers/versions.py

@@ -146,6 +146,29 @@ def is_valid(cls, string):
         return string == "vers:none/*"
 
 
+class LexicographicVersion(Version):
+    @classmethod
+    def build_value(cls, string):
+        return str(string)
+
+    """
+    Create a string, even if, e.g., an integer is given
+    """
+
+    @classmethod
+    def normalize(cls, string):
+        return remove_spaces(str(string))
+
+    def __lt__(self, other):
+        return self.value.encode("utf-8") < other.value.encode("utf-8")
+
+    def __gt__(self, other):
+        return self.value.encode("utf-8") > other.value.encode("utf-8")
+
+    def __eq__(self, other):
+        return self.value.encode("utf-8") == other.value.encode("utf-8")
+
+
 class IntdotVersion(Version):
     @classmethod
     def build_value(cls, string):
@@ -726,4 +749,5 @@ def bump(self, index):
     LegacyOpensslVersion,
     AlpineLinuxVersion,
     IntdotVersion,
+    LexicographicVersion,
 ]

tests/test_version_range.py

@@ -22,6 +22,7 @@
 from univers.version_range import build_range_from_snyk_advisory_string
 from univers.version_range import from_gitlab_native
 from univers.versions import IntdotVersion
+from univers.versions import LexicographicVersion
 from univers.versions import OpensslVersion
 from univers.versions import PypiVersion
 from univers.versions import SemverVersion
@@ -366,3 +367,12 @@ def test_version_range_intdot():
     assert IntdotVersion("1.3.3alpha") in intdot_range
     assert IntdotVersion("1.2.2.pre") not in intdot_range
     assert IntdotVersion("1010.23.234203.0") in IntdotVersionRange.from_string("vers:intdot/*")
+
+
+def test_version_range_lexicographic():
+    assert LexicographicVersion("1.2.3") in VersionRange.from_string(
+        "vers:lexicographic/<1.2.4|>0.9"
+    )
+    assert LexicographicVersion(-123) in VersionRange.from_string("vers:lexicographic/<~")
+    assert LexicographicVersion(None) in VersionRange.from_string("vers:lexicographic/*")
+    assert LexicographicVersion("ABC") in VersionRange.from_string("vers:lexicographic/>abc|<=None")

tests/test_versions.py

@@ -13,6 +13,7 @@
 from univers.versions import GentooVersion
 from univers.versions import GolangVersion
 from univers.versions import IntdotVersion
+from univers.versions import LexicographicVersion
 from univers.versions import MavenVersion
 from univers.versions import NginxVersion
 from univers.versions import NugetVersion
@@ -230,3 +231,13 @@ def test_intdot_version():
     assert IntdotVersion("1.2.3.4.6-pre") <= IntdotVersion("2.2.3.4.5.pre")
     assert IntdotVersion("1.2.3.4.6-pre") <= IntdotVersion("2.2.3.4.5-10")
     assert IntdotVersion("1.2.3.4.6-pre") <= IntdotVersion("2.2.3.4.5-10")
+
+
+def test_lexicographic_version():
+    assert LexicographicVersion("abc") == LexicographicVersion("abc")
+    assert LexicographicVersion(" abc") == LexicographicVersion("abc")
+    assert LexicographicVersion("123") == LexicographicVersion(123)
+    assert LexicographicVersion("abc") > LexicographicVersion(None)
+    assert LexicographicVersion("Abc") < LexicographicVersion(None)
+    assert LexicographicVersion("123") < LexicographicVersion("bbc")
+    assert LexicographicVersion("2.3.4") > LexicographicVersion("1.2.3")