Make it possible to create AST, by using the --ast flag

cli/cmdlineparser.cpp

@@ -125,6 +125,10 @@ bool CmdLineParser::ParseFromArgs(int argc, const char* const argv[])
         else if (std::strcmp(argv[i], "--debug-fp") == 0)
             _settings->debugFalsePositive = true;
 
+        // Experimental AST handling
+        else if (std::strcmp(argv[i], "--ast") == 0)
+            _settings->ast = true;
+
         // Inconclusive checking (still in testing phase)
         else if (std::strcmp(argv[i], "--inconclusive") == 0)
             _settings->inconclusive = true;

lib/settings.cpp

@@ -26,7 +26,7 @@
 Settings::Settings()
     : _terminate(false),
       debug(false), debugwarnings(false), debugFalsePositive(false),
-      inconclusive(false), experimental(false),
+      ast(false), inconclusive(false), experimental(false),
       _errorsOnly(false),
       _inlineSuppressions(false),
       _verbose(false),

lib/settings.h

@@ -62,6 +62,9 @@ public:
     /** @brief Is --debug-fp given? */
     bool debugFalsePositive;
 
+    /** @brief Experimental AST handling */
+    bool ast;
+
     /** @brief Inconclusive checks */
     bool inconclusive;
 

lib/token.cpp

@@ -1166,13 +1166,30 @@ void Token::astHandleParentheses()
         innerTop = innerTop->_astParent;
 
     if (_astParent) {
-        if (_str == "(" && _astParent->_astOperand2 != NULL)
+        if (_astParent->_astOperand2 == this)
             _astParent->_astOperand2 = innerTop;
-        else
+        else if (_astParent->_astOperand1 == this)
             _astParent->_astOperand1 = innerTop;
         innerTop->_astParent = _astParent;
-    } else {
+        _astParent = NULL;
-        _astParent = innerTop;
     }
 }
 
+
+void Token::printAst() const
+{
+    bool title = false;
+
+    bool print = true;
+    for (const Token *tok = this; tok; tok = tok->next()) {
+        if (print && tok->_astOperand1) {
+            if (!title)
+                std::cout << "\n\n##AST" << std::endl;
+            title = true;
+            std::cout << tok->astTop()->astString(" ") << std::endl;
+            print = false;
+        }
+        if (Token::Match(tok, "[;{}]"))
+            print = true;
+    }
+}

lib/token.h

@@ -671,14 +671,16 @@ public:
         return ret;
     }
 
-    std::string astString() const {
+    std::string astString(const char *sep = "") const {
         std::string ret;
         if (_astOperand1)
-            ret = _astOperand1->astString();
+            ret = _astOperand1->astString(sep);
         if (_astOperand2)
-            ret += _astOperand2->astString();
+            ret += _astOperand2->astString(sep);
-        return ret+_str;
+        return ret + sep + _str;
     }
+
+    void printAst() const;
 };
 
 /// @}

lib/tokenize.cpp

@@ -3645,6 +3645,12 @@ bool Tokenizer::simplifyTokenList()
             tok->deleteNext();
     }
 
+    // Experimental AST handling. Only for C code now since
+    // uninstantiated C++ templates are not handled well. Fix
+    // TestTokenize::asttemplate
+    if (_settings->ast && isC())
+        list.createAst();
+
     if (_settings->terminated())
         return false;
 
@@ -3653,6 +3659,9 @@ bool Tokenizer::simplifyTokenList()
 
         if (_settings->_verbose)
             _symbolDatabase->printOut("Symbol database");
+
+        if (_settings->ast)
+            list.front()->printAst();
     }
 
     if (_settings->debugwarnings) {

lib/tokenlist.cpp

@@ -392,7 +392,7 @@ void TokenList::createAst() const
             while (tok->next())
                 tok = tok->next();
             for (; tok; tok = tok->previous()) {
-                if ((!tok->previous() || tok->previous()->isOp()) &&
+                if (tok->isOp() && (!tok->previous() || tok->previous()->isOp() || tok->previous()->type() == Token::eOther) &&
                     op.find(" "+tok->str()+" ")!=std::string::npos) {
                     tok->astOperand1(tok->next());
                 }
@@ -401,6 +401,13 @@ void TokenList::createAst() const
             const std::string op(operators[i]);
             for (Token *tok = _front; tok; tok = tok->next()) {
                 if (tok->astOperand1()==NULL && op.find(" "+tok->str()+" ")!=std::string::npos) {
+                    // Don't create AST for "..."
+                    if (tok->str() == "." && (tok->previous()->str() == "." || tok->next()->str() == "."))
+                        continue;
+
+                    if (Token::Match(tok, "* [)]]"))
+                        continue;
+
                     if (tok->type() != Token::eIncDecOp) {
                         tok->astOperand1(tok->previous());
                         tok->astOperand2(tok->next());

test/testtokenize.cpp

@@ -9929,7 +9929,13 @@ private:
         // Create AST..
         tokenList.createAst();
 
-        return tokenList.front()->astTop()->astString();
+        for (const Token *tok = tokenList.front(); tok; tok = tok->next()) {
+            if (tok->astOperand1())
+                return tok->astTop()->astString();
+        }
+
+        // No AST found
+        return "";
     }
 
     void astexpr() const { // simple expressions with arithmetical ops