Add normalizer support for E701-E704.

parso/python/normalizer.py

@@ -119,6 +119,20 @@ class PEP8Normalizer(Normalizer):
                     self.add_issue(743, message % 'function', leaf)
                 else:
                     self.add_issuadd_issue(741, message % 'variables', leaf)
+        elif leaf.value == ':':
+            from parso.python.tree import Flow, Scope
+            if isinstance(leaf.parent, (Flow, Scope)) and leaf.parent.type != 'lambdef':
+                next_leaf = leaf.get_next_leaf()
+                if next_leaf.type != 'newline':
+                    if leaf.parent.type == 'funcdef':
+                        self.add_issue(704, 'Multiple statements on one line (def)', next_leaf)
+                    else:
+                        self.add_issue(701, 'Multiple statements on one line (colon)', next_leaf)
+        elif leaf.value == ';':
+            if leaf.get_next_leaf().type in ('newline', 'endmarker'):
+                self.add_issue(703, 'Statement ends with a semicolon', leaf)
+            else:
+                self.add_issue(702, 'Multiple statements on one line (semicolon)', leaf)
 
         for part in leaf._split_prefix():
             part

test/normalizer_issue_files/E70.py

@@ -0,0 +1,21 @@
+#: E701:6
+if a: a = False
+#: E701:41
+if not header or header[:6] != 'bytes=': return
+#: E702:9
+a = False; b = True
+#: E702:16 E402
+import bdist_egg; bdist_egg.write_safety_flag(cmd.egg_info, safe)
+#: E703:12 E402
+import shlex;
+#: E702:8 E703:22
+del a[:]; a.append(42);
+#: E704:10
+def f(x): return 2
+#: E704:16
+async def f(x): return 2
+#: E704:10
+def f(x): return 2 * x
+while all is round:
+    #: E704:10
+    def f(x): return 2 * x