Add mattermost version range

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

src/univers/version_range.py

@@ -1092,6 +1092,11 @@ def from_native(cls, string):
         return cls(constraints=constraints)
 
 
+class MattermostVersionRange(VersionRange):
+    scheme = "mattermost"
+    version_class = versions.SemverVersion
+
+
 def from_gitlab_native(gitlab_scheme, string):
     purl_scheme = PURL_TYPE_BY_GITLAB_SCHEME[gitlab_scheme]
     vrc = RANGE_CLASS_BY_SCHEMES[purl_scheme]
@@ -1217,6 +1222,7 @@ def build_range_from_github_advisory_constraint(scheme: str, string: str):
     "alpm": ArchLinuxVersionRange,
     "nginx": NginxVersionRange,
     "openssl": OpensslVersionRange,
+    "mattermost": MattermostVersionRange,
 }
 
 PURL_TYPE_BY_GITLAB_SCHEME = {

tests/test_version_range.py

@@ -9,7 +9,7 @@
 import pytest
 
 from univers.version_constraint import VersionConstraint
-from univers.version_range import GemVersionRange
+from univers.version_range import GemVersionRange, MattermostVersionRange
 from univers.version_range import from_gitlab_native
 from univers.version_range import NugetVersionRange
 from univers.version_range import InvalidVersionRange
@@ -413,3 +413,17 @@ def test_invert():
 
     vers_with_star_operator = VersionRange.from_string("vers:gem/*")
     assert vers_with_star_operator.invert() == None
+
+
+def test_mattermost_version_range():
+    assert MattermostVersionRange(
+        constraints=[
+            VersionConstraint(comparator="=", version=SemverVersion("5.0")),
+        ]
+    ) == VersionRange.from_string("vers:mattermost/5.0")
+
+    assert MattermostVersionRange(
+        constraints=[
+            VersionConstraint(comparator=">=", version=SemverVersion("5.0")),
+        ]
+    ) == VersionRange.from_string("vers:mattermost/>=5.0")