tokenizer: Added functions "alwaysTrue" and "alwaysFalse" to check if a

condition is always true / false

testtokenize.cpp

@@ -41,7 +41,10 @@ private:
 
         TEST_CASE( inlineasm );
 
-        TEST_CASE( dupfuncname );
+        TEST_CASE( dupfuncname );
+
+        TEST_CASE( alwaysTrue );
+        TEST_CASE( alwaysFalse );
     }
 
 
@@ -155,6 +158,47 @@ private:
 
         ASSERT_EQUALS( 1, tokenizer.FunctionList.size() );
         ASSERT_EQUALS( std::string("b"), tokenizer.FunctionList[0]->str );
+    }
+
+
+    bool alwaysTrueCheck(const char condition[])
+    {
+        // tokenize..
+        Tokenizer tokenizer( this );
+        tokenizer.getFiles()->push_back( "test.cpp" );
+        std::istringstream istr(condition);
+        tokenizer.TokenizeCode(istr, 0);
+
+        // check..
+        return tokenizer.alwaysTrue( tokenizer.tokens() );
+    }
+
+    void alwaysTrue()
+    {
+        ASSERT_EQUALS(true, alwaysTrueCheck("(1)"));
+        ASSERT_EQUALS(true, alwaysTrueCheck("(true)"));
+        ASSERT_EQUALS(true, alwaysTrueCheck("(true || false)"));
+        ASSERT_EQUALS(false, alwaysTrueCheck("(true && false)"));
+    }
+
+    bool alwaysFalseCheck(const char condition[])
+    {
+        // tokenize..
+        Tokenizer tokenizer( this );
+        tokenizer.getFiles()->push_back( "test.cpp" );
+        std::istringstream istr(condition);
+        tokenizer.TokenizeCode(istr, 0);
+
+        // check..
+        return tokenizer.alwaysFalse( tokenizer.tokens() );
+    }
+
+    void alwaysFalse()
+    {
+        ASSERT_EQUALS(true, alwaysFalseCheck("(0)"));
+        ASSERT_EQUALS(true, alwaysFalseCheck("(false)"));
+        ASSERT_EQUALS(true, alwaysFalseCheck("(false && true)"));
+        ASSERT_EQUALS(false, alwaysFalseCheck("(false || true)"));
     }
 };
 

tokenize.cpp

@@ -1468,7 +1468,7 @@ bool Tokenizer::Match(const TOKEN *tok, const char pattern[], const char *varnam
             return false;
 
         tok = tok->next;
-        if (!tok)
+        if (!tok && *p)
             return false;
     }
 
@@ -1517,3 +1517,17 @@ bool Tokenizer::IsStandardType(const char str[])
         Ret |= (strcmp(str,type[i])==0);
     return Ret;
 }
+//---------------------------------------------------------------------------
+
+bool Tokenizer::alwaysTrue( const TOKEN *tok )
+{
+    return (Match(tok,"( 1 [|)]") | Match(tok,"( 1 ||") |
+            Match(tok,"( true [|)]") | Match(tok,"( true ||"));
+}
+//---------------------------------------------------------------------------
+bool Tokenizer::alwaysFalse( const TOKEN *tok )
+{
+    return (Match(tok,"( 0 [&)]") | Match(tok,"( 0 &&") |
+            Match(tok,"( false [&)]") | Match(tok,"( false &&"));
+}
+//---------------------------------------------------------------------------

tokenize.h

@@ -90,6 +90,8 @@ public:
     static bool IsNumber(const char str[]);
     static bool IsStandardType(const char str[]);
 
+    bool alwaysTrue( const TOKEN *tok );
+    bool alwaysFalse( const TOKEN *tok );
 
     std::string fileLine( const TOKEN *tok );