Lexicographic versioning scheme

src/univers/version_range.py

@@ -968,6 +968,11 @@ class GolangVersionRange(VersionRange):
     }
 
 
+class LexicographicVersionRange(VersionRange):
+    scheme = "lexicographic"
+    version_class = versions.LexicographicVersion
+
+
 class GenericVersionRange(VersionRange):
     scheme = "generic"
     version_class = versions.SemverVersion
@@ -1426,6 +1431,7 @@ def build_range_from_snyk_advisory_string(scheme: str, string: Union[str, List])
     "gem": GemVersionRange,
     "rpm": RpmVersionRange,
     "golang": GolangVersionRange,
+    "lexicographic": LexicographicVersionRange,
     "generic": GenericVersionRange,
     "apache": ApacheVersionRange,
     "hex": HexVersionRange,

src/univers/versions.py

@@ -143,6 +143,29 @@ class NoneVersion(Version):
     @classmethod
     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 GenericVersion(Version):
@@ -702,6 +725,7 @@ def bump(self, index):
     SemverVersion,
     GolangVersion,
     PypiVersion,
+    LexicographicVersion,
     GenericVersion,
     ComposerVersion,
     NginxVersion,

tests/test_version_range.py

@@ -23,6 +23,7 @@
 from univers.version_range import build_range_from_snyk_advisory_string
 from univers.version_range import from_gitlab_native
 from univers.versions import InvalidVersion
+from univers.versions import LexicographicVersion
 from univers.versions import NugetVersion
 from univers.versions import OpensslVersion
 from univers.versions import PypiVersion
@@ -569,3 +570,12 @@ def test_version_range_none():
         VersionRange.from_string("vers:none/!1.2.3")
     with pytest.raises(Exception):
         VersionRange.from_string("vers:none/*|>1.2.3")
+
+
+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

@@ -12,6 +12,7 @@
 from univers.versions import EnhancedSemanticVersion
 from univers.versions import GentooVersion
 from univers.versions import GolangVersion
+from univers.versions import LexicographicVersion
 from univers.versions import MavenVersion
 from univers.versions import NginxVersion
 from univers.versions import NugetVersion
@@ -218,3 +219,13 @@ def test_golang_version():
     assert GolangVersion("v0.1.1") >= GolangVersion("v0.1.1")
     assert GolangVersion("v0.1.1") <= GolangVersion("v0.1.1")
     assert GolangVersion("v0.1.1") <= GolangVersion("v0.1.2")
+
+
+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")