Tokenizer: simplification of typedefs in _Generic arguments (danmar#5059)

Author: danmar

lib/tokenize.cpp

@@ -935,6 +935,18 @@ namespace {
                     return true;
                 if (Token::Match(tok->previous(), "public|protected|private"))
                     return true;
+                if (Token::Match(tok->previous(), ", %name% :")) {
+                    bool isGeneric = false;
+                    for (; tok; tok = tok->previous()) {
+                        if (Token::Match(tok, ")|]"))
+                            tok = tok->link();
+                        else if (Token::Match(tok, "[;{}(]")) {
+                            isGeneric = Token::simpleMatch(tok->previous(), "_Generic (");
+                            break;
+                        }
+                    }
+                    return isGeneric;
+                }
                 return false;
             }
             if (Token::Match(tok->previous(), "%name%") && !tok->previous()->isKeyword())

test/testsimplifytypedef.cpp

@@ -69,6 +69,7 @@ class TestSimplifyTypedef : public TestFixture {
         TEST_CASE(carray2);
         TEST_CASE(cdonotreplace1);
         TEST_CASE(cppfp1);
+        TEST_CASE(Generic1);
 
         TEST_CASE(simplifyTypedef1);
         TEST_CASE(simplifyTypedef2);
@@ -463,6 +464,12 @@ class TestSimplifyTypedef : public TestFixture {
         ASSERT_EQUALS("void foo ( void ( * p ) ( void ) ) ;", tok(code));
     }
 
+    void Generic1() {
+        const char code[] = "typedef void func(void);\n"
+                            "_Generic((x), func: 1, default: 2);";
+        ASSERT_EQUALS("_Generic ( x , void ( ) : 1 , default : 2 ) ;", tok(code));
+    }
+
     void simplifyTypedef1() {
         const char code[] = "class A\n"
                             "{\n"