Merge pull request #990 from cdce8p/whitespace-match-case

Add whitespace checks for ``match`` and ``case``

Author: asottile

pycodestyle.py

@@ -163,6 +163,7 @@ def lru_cache(maxsize=128):  # noqa as it's a fake implementation.
     )))
 )
 DUNDER_REGEX = re.compile(r'^__([^\s]+)__ = ')
+MATCH_CASE_REGEX = re.compile(r'^\s*\b(?:match|case)(\s*)(?=.*\:)')
 
 _checks = {'physical_line': {}, 'logical_line': {}, 'tree': {}}
 
@@ -493,6 +494,16 @@ def whitespace_around_keywords(logical_line):
         elif len(after) > 1:
             yield match.start(2), "E271 multiple spaces after keyword"
 
+    if sys.version_info >= (3, 10):
+        match = MATCH_CASE_REGEX.match(logical_line)
+        if match:
+            if match[1] == ' ':
+                return
+            if match[1] == '':
+                yield match.start(1), "E275 missing whitespace after keyword"
+            else:
+                yield match.start(1), "E271 multiple spaces after keyword"
+
 
 @register_check
 def missing_whitespace_after_import_keyword(logical_line):

testsuite/python310.py

@@ -7,3 +7,21 @@
         pass
     case _:
         print("Default")
+#: E271:2:6 E271:3:9 E271:5:9 E271:7:9
+var = 1
+match  var:
+    case  1:
+        pass
+    case	2:
+        pass
+    case  (
+        3
+    ):
+        pass
+#: E275:2:6 E275:3:9 E275:5:9
+var = 1
+match(var):
+    case(1):
+        pass
+    case_:
+        pass

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27, py34, py35, py36, py37, py38, pypy, pypy3, jython
+envlist = py27, py34, py35, py36, py37, py38, py39, py310, pypy, pypy3, jython
 skip_missing_interpreters = True
 
 [testenv]