misra: fix misra-3_1 false positive for URIs in block comments (#4939)

* misra: fix misra-3_1 false positive for URIs in block comments

* added unit test, improved new misra 3.1 based on false positives

---------

Co-authored-by: Paul B <unconfigured@null.spigotmc.org>

addons/misra.py

@@ -1543,10 +1543,19 @@ class MisraChecker:
     def misra_3_1(self, rawTokens):
         for token in rawTokens:
             starts_with_double_slash = token.str.startswith('//')
-            if token.str.startswith('/*') or starts_with_double_slash:
-                s = token.str.lstrip('/')
-                if ((not starts_with_double_slash) and '//' in s) or '/*' in s:
-                    self.reportError(token, 3, 1)
+            starts_with_block_comment = token.str.startswith("/*")
+            s = token.str.lstrip('/')
+            if (starts_with_double_slash or starts_with_block_comment) and "/*" in s:
+                # Block comment inside of regular comment, violation
+                self.reportError(token, 3, 1)
+            elif starts_with_block_comment and "//" in s:
+                # "//" in block comment, check if it's a uri
+                while "//" in s:
+                    possible_uri, s = s.split("//", 1)
+                    if not re.search(r"\w+:$", possible_uri):
+                        # Violation if no uri was found
+                        self.reportError(token, 3, 1)
+                        break
 
     def misra_3_2(self, rawTokens):
         for token in rawTokens:

addons/test/misra/misra-test.c

@@ -82,6 +82,7 @@ static void misra_2_2(int x) {
 /* // */   // 3.1
 /* /* */   // 3.1
 ////
+/* https://cppcheck.net */
 
 // http://example.com // no warning