Add version range support for maven

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

Author: TG1999

src/univers/version_range.py

@@ -12,6 +12,7 @@
 from semantic_version.base import AnyOf
 
 from univers import gem
+from univers import maven
 from univers import versions
 from univers.utils import remove_spaces
 from univers.version_constraint import VersionConstraint
@@ -590,6 +591,62 @@ class MavenVersionRange(VersionRange):
     scheme = "maven"
     version_class = versions.MavenVersion
 
+    @classmethod
+    def from_native(cls, string):
+        """
+        Return a VersionRange built from a Maven version specifier ``string``.
+        """
+
+        string = "".join(string.split(" "))
+
+        restrictions = maven.VersionRange(string).restrictions
+        constraints = []
+
+        for restriction in restrictions:
+            lower_bound = restriction.lower_bound
+            upper_bound = restriction.upper_bound
+            lower_inclusive = restriction.lower_bound_inclusive
+            upper_inclusive = restriction.upper_bound_inclusive
+
+            if lower_bound == upper_bound:
+                constraints.append(
+                    VersionConstraint(comparator="=", version=cls.version_class(str(lower_bound)))
+                )
+                continue
+
+            if lower_bound:
+                if lower_inclusive:
+                    comparator = ">="
+                else:
+                    comparator = ">"
+                constraints.append(
+                    VersionConstraint(
+                        comparator=comparator, version=cls.version_class(str(lower_bound))
+                    )
+                )
+
+            if upper_bound:
+                if upper_inclusive:
+                    comparator = "<="
+                else:
+                    comparator = "<"
+                constraints.append(
+                    VersionConstraint(
+                        comparator=comparator, version=cls.version_class(str(upper_bound))
+                    )
+                )
+
+        return cls(constraints=constraints)
+
+    @classmethod
+    def from_natives(cls, strings):
+        if isinstance(strings, str):
+            return cls.from_native(strings)
+        constraints = []
+        for rel in strings:
+            constraints.extend(cls.from_native(rel).constraints)
+        return cls(constraints=constraints)
+
 
 class NugetVersionRange(VersionRange):
     """

tests/test_maven_version_range.py

@@ -0,0 +1,75 @@
+#
+# Copyright (c) nexB Inc. and others.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Visit https://aboutcode.org and https://github.com/nexB/univers for support and download.
+
+from univers.version_range import MavenVersionRange
+from univers.version_constraint import VersionConstraint
+from univers.versions import MavenVersion
+
+
+def test_maven_version_range_from_native_with_lower_inclusive():
+    version_range = MavenVersionRange.from_native("[1.0.0,2.0.0)")
+    assert version_range == MavenVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=MavenVersion(string="1.0.0")),
+            VersionConstraint(comparator="<", version=MavenVersion(string="2.0.0")),
+        )
+    )
+
+
+def test_maven_version_range_from_native_with_nothing_inclusive():
+    version_range = MavenVersionRange.from_native(" ( 1.0.0 , 2.1.4 ) ")
+    assert version_range == MavenVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">", version=MavenVersion(string="1.0.0")),
+            VersionConstraint(comparator="<", version=MavenVersion(string="2.1.4")),
+        )
+    )
+
+
+def test_maven_version_range_from_native_for_pinned_version():
+    version_range = MavenVersionRange.from_native("[1.0.0]")
+    assert version_range == MavenVersionRange(
+        constraints=(VersionConstraint(comparator="=", version=MavenVersion(string="1.0.0")),)
+    )
+
+
+def test_maven_version_range_from_native_for_illformed_version():
+    try:
+        MavenVersionRange.from_native("(1.0.0]")
+        assert False, "should have raised an exception"
+    except ValueError:
+        assert True
+
+
+def test_maven_version_range_from_native_str_representation():
+    version_range = MavenVersionRange.from_native("[1.0.0,5.1)")
+    assert str(version_range) == "vers:maven/>=1.0.0|<5.1"
+
+
+def test_maven_version_range_from_native_for_multiple_version_ranges():
+    version_range = MavenVersionRange.from_native("[2.0,2.3.1] , [2.4.0,2.12.2) , [2.13.0,2.15.0)")
+    assert version_range == MavenVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=MavenVersion(string="2.0")),
+            VersionConstraint(comparator="<=", version=MavenVersion(string="2.3.1")),
+            VersionConstraint(comparator=">=", version=MavenVersion(string="2.4.0")),
+            VersionConstraint(comparator="<", version=MavenVersion(string="2.12.2")),
+            VersionConstraint(comparator=">=", version=MavenVersion(string="2.13.0")),
+            VersionConstraint(comparator="<", version=MavenVersion(string="2.15.0")),
+        )
+    )
+
+
+def test_maven_version_range_from_native_for_multiple_pinned_versions_and_a_range():
+    version_range = MavenVersionRange.from_native("[2.0] , [2.4.0] , [2.13.0,2.15.0)")
+    assert version_range == MavenVersionRange(
+        constraints=(
+            VersionConstraint(comparator="=", version=MavenVersion(string="2.0")),
+            VersionConstraint(comparator="=", version=MavenVersion(string="2.4.0")),
+            VersionConstraint(comparator=">=", version=MavenVersion(string="2.13.0")),
+            VersionConstraint(comparator="<", version=MavenVersion(string="2.15.0")),
+        )
+    )