Add support for pypi, npm, gem

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

Author: TG1999

src/univers/version_range.py

@@ -260,6 +260,37 @@ def from_native(cls, string):
 
         return cls(constraints=anyof_constraints)
 
+    @classmethod
+    def from_gitlab_native(cls, string):
+        constraints = []
+        parsed_constraints = set()
+        pipe_separated_constraints = string.split("||")
+        for pipe_separated_constraints in pipe_separated_constraints:
+            space_seperated_constraints = pipe_separated_constraints.split(" ")
+            constraints.extend(space_seperated_constraints)
+        comparator = ""
+        while "" in constraints:
+            constraints.remove("")
+        for constraint in constraints:
+            if constraint in cls.vers_by_native_comparators:
+                comparator = cls.vers_by_native_comparators[constraint]
+                continue
+            if comparator:
+                parsed_constraints.add(
+                    VersionConstraint(comparator=comparator, version=cls.version_class(constraint))
+                )
+            else:
+                comparator, version_constraint = split_req(
+                    constraint, cls.vers_by_native_comparators
+                )
+                parsed_constraints.add(
+                    VersionConstraint(
+                        comparator=comparator, version=cls.version_class(version_constraint)
+                    )
+                )
+            comparator = ""
+        return cls(constraints=list(parsed_constraints))
+
 
 def get_allof_constraints(cls, clause):
     """
@@ -319,6 +350,18 @@ def from_native(cls, string):
 
         return cls(constraints=constraints)
 
+    @classmethod
+    def from_gitlab_native(cls, string):
+        constraints = set()
+        parsed_constraints = []
+        pipe_separated_constraints = string.split("||")
+        for pipe_separated_constraints in pipe_separated_constraints:
+            space_seperated_constraints = pipe_separated_constraints.split(" ")
+            constraints.update(space_seperated_constraints)
+        for constraint in constraints:
+            parsed_constraints.extend(cls.from_native(constraint).constraints)
+        return cls(constraints=parsed_constraints)
+
 
 def split_req(string, comparators, default=None, strip=""):
     """
@@ -583,6 +626,14 @@ def from_native(cls, string):
 
         return cls(constraints=constraints)
 
+    @classmethod
+    def from_gitlab_native(cls, string):
+        constraints = []
+        pipe_separated_constraints = string.split("||")
+        for pipe_separated_constraints in pipe_separated_constraints:
+            constraints.extend(cls.from_native(pipe_separated_constraints).constraints)
+        return cls(constraints=constraints)
+
 
 class MavenVersionRange(VersionRange):
     """