Fix version parsing for 4 digits versions and post releases

poetry/semver/patterns.py

@@ -2,8 +2,8 @@ import re
 
 MODIFIERS = (
     '[._-]?'
-    '((?:beta|b|c|pre|RC|alpha|a|patch|pl|p|dev)(?:(?:[.-]?\d+)*)?)?'
-    '((?:[+-]|post)?([0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*))?'
+    '((?!post)(?:beta|b|c|pre|RC|alpha|a|patch|pl|p|dev)(?:(?:[.-]?\d+)*)?)?'
+    '([+-]?([0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*))?'
 )
 
 _COMPLETE_VERSION = 'v?(\d+)(?:\.(\d+))?(?:\.(\d+))?{}(?:\+[^\s]+)?'.format(MODIFIERS)

poetry/semver/version.py

@@ -50,6 +50,8 @@ class Version(VersionRange):
         if pre is not None:
             self._prerelease = self._split_parts(pre)
 
+        build = self._normalize_build(build)
+
         self._build = []
         if build is not None:
             if build.startswith(('-', '+')):
@@ -253,6 +255,21 @@ class Version(VersionRange):
 
         return '{}.{}'.format(modifier, number)
 
+    def _normalize_build(self, build):  # type: (str) -> str
+        if not build:
+            return
+
+        if build == '0':
+            return
+
+        if build.startswith('post'):
+            build = build.lstrip('post')
+
+        if not build:
+            return
+
+        return build
+
     def _split_parts(self, text):  # type: (str) -> List[Union[str, int]]
         parts = text.split('.')
 

tests/semver/test_version.py

@@ -18,12 +18,16 @@ from poetry.semver import VersionRange
         ('1.0.0-beta.1', Version(1, 0, 0, 'beta1')),
         ('1.0.0+1', Version(1, 0, 0, None, '1')),
         ('1.0.0-1', Version(1, 0, 0, None, '1')),
+        ('1.0.0.0', Version(1, 0, 0)),
+        ('1.0.0-post', Version(1, 0, 0)),
+        ('1.0.0-post1', Version(1, 0, 0, None, '1')),
         ('0.6c', Version(0, 6, 0, 'rc0')),
         ('0.6pre', Version(0, 6, 0, 'rc0')),
     ]
 )
 def test_parse_valid(input, version):
     parsed = Version.parse(input)
+    print(parsed.build)
 
     assert parsed == version
     assert parsed.text == input