Add composer and golang versions

And also support gitlab native ranges for them

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

Author: TG1999

src/univers/version_range.py

@@ -664,7 +664,16 @@ class ComposerVersionRange(VersionRange):
     # TODO composer may need its own scheme see https//github.com/nexB/univers/issues/5
     # and https//getcomposer.org/doc/articles/versions.md
     scheme = "composer"
-    version_class = versions.SemverVersion
+    version_class = versions.ComposerVersion
+
+    vers_by_native_comparators = {
+        "==": "=",
+        "<=": "<=",
+        ">=": ">=",
+        "<": "<",
+        ">": ">",
+        "=": "=",  # This is not a native composer-semver comparator, but is used in the gitlab version range for composer packages.
+    }
 
 
 class RpmVersionRange(VersionRange):
@@ -757,7 +766,16 @@ class GolangVersionRange(VersionRange):
     """
 
     scheme = "golang"
-    version_class = versions.SemverVersion
+    version_class = versions.GolangVersion
+
+    vers_by_native_comparators = {
+        "==": "=",
+        "<=": "<=",
+        ">=": ">=",
+        "<": "<",
+        ">": ">",
+        "=": "=",  # This is not a native golang-semver comparator, but is used in the gitlab version range for go packages.
+    }
 
 
 class GenericVersionRange(VersionRange):
@@ -980,7 +998,8 @@ def from_gitlab_native(cls, scheme, string):
         constraint_items = []
         constraints = []
         split = " "
-        if scheme == "pypi":
+        split_by_comma_schemes = ["pypi", "composer"]
+        if scheme in split_by_comma_schemes:
             split = ","
         pipe_separated_constraints = string.split("||")
         for pipe_separated_constraint in pipe_separated_constraints:

src/univers/versions.py

@@ -427,6 +427,38 @@ def __gt__(self, other):
         return gentoo.vercmp(self.value, other.value) > 0
 
 
+@attr.s(frozen=True, order=False, eq=False, hash=True)
+class ComposerVersion(SemverVersion):
+    @classmethod
+    def build_value(cls, string):
+        string = string.lstrip("vV")
+        return SemverVersion(string=string)
+
+    @classmethod
+    def is_valid(cls, string):
+        try:
+            cls.build_value(string)
+            return True
+        except ValueError:
+            return False
+
+
+@attr.s(frozen=True, order=False, eq=False, hash=True)
+class GolangVersion(SemverVersion):
+    @classmethod
+    def build_value(cls, string):
+        string = string.lstrip("vV")
+        return SemverVersion(string=string)
+
+    @classmethod
+    def is_valid(cls, string):
+        try:
+            cls.build_value(string)
+            return True
+        except ValueError:
+            return False
+
+
 @attr.s(frozen=True, order=False, eq=False, hash=True)
 class LegacyOpensslVersion(Version):
     """