Fix handling pre-1.0.0 caret versions (Closes #35)

Thanks to @autopulated for pointing the issue!

4 files changed, 25 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index 423e3bd..7352663 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,15 @@
 ChangeLog
 =========
 
+
+2.5.1 (master)
+--------------
+
+*Bugfix:*
+
+    * `#35 <https://github.com/rbarrois/python-semanticversion/issues/35>`_:
+      Properly handle `^0.X.Y` in a NPM-compatible way
+
 2.5.0 (2016-02-12)
 ------------------
 
diff --git a/semantic_version/base.py b/semantic_version/base.py
index 8877dbf..1504642 100644
--- a/semantic_version/base.py
+++ b/semantic_version/base.py
@@ -459,7 +459,13 @@ class SpecItem(object):
         elif self.kind == self.KIND_NEQ:
             return version != self.spec
         elif self.kind == self.KIND_CARET:
-            return self.spec <= version < self.spec.next_major()
+            if self.spec.major != 0:
+                upper = self.spec.next_major()
+            elif self.spec.minor != 0:
+                upper = self.spec.next_minor()
+            else:
+                upper = self.spec.next_patch()
+            return self.spec <= version < upper
         elif self.kind == self.KIND_TILDE:
             return self.spec <= version < self.spec.next_minor()
         else:  # pragma: no cover
diff --git a/tests/test_base.py b/tests/test_base.py
index 1fcce8c..24bf86e 100755
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -506,6 +506,14 @@ class SpecItemTestCase(unittest.TestCase):
             ['1.1.3', '1.2.1', '1.1.2-alpha', '1.1.2-alpha+b1'],
             ['1.1.1', '2.1.0'],
         ),
+        '^0.1.2': (
+            ['0.1.2', '0.1.2-alpha', '0.1.3'],
+            ['0.2.0', '1.1.2', '0.1.1'],
+        ),
+        '^0.0.2': (
+            ['0.0.2', '0.0.2-alpha', '0.0.2+abb'],
+            ['0.1.0', '0.0.3', '1.0.0'],
+        ),
     }
 
     def test_matches(self):
diff --git a/tests/test_match.py b/tests/test_match.py
index f0b0fe8..49464f8 100755
--- a/tests/test_match.py
+++ b/tests/test_match.py
@@ -106,7 +106,7 @@ class MatchTestCase(unittest.TestCase):
             '0.1.2',
             '0.1.2+build4.5',
             '0.1.3-rc1.3',
-            '0.2.0',
+            '0.1.4',
         ],
         '~0.1.2': [
             '0.1.2',