diff --git a/src/lex/lexer.l b/src/lex/lexer.l
index a932b11..8823195 100644
--- a/src/lex/lexer.l
+++ b/src/lex/lexer.l
@@ -1,84 +1,83 @@
 %option noyywrap
 %{
     #include <yacc/parser.tab.h>
+    #include <sys/log.h>
 
     int yyLineNumber = 1;
     int yylex();
 %}
 
-
 /* disable the following functions */
 /* to avoid failing code check */
 %option nounput
 %option noinput
 
-
 %%
 "\n"    yyLineNumber++;
 
-":" return(':');
-"=" return('=');
-"+"  return('+');
-"-"  return('-');
-"*"  return('*');
-"/"  return('/');
-"," return(',');
-";"  return(';');
-"." return('.');
-"#" return('#');
+":" {DEBUG("\"%s\" tokenized with \':\'", yytext); return(':');};
+"=" {DEBUG("\"%s\" tokenized with \'=\'", yytext); return('=');};
+"+" {DEBUG("\"%s\" tokenized with \'+\'", yytext); return('+');};
+"-" {DEBUG("\"%s\" tokenized with \'-\'", yytext); return('-');};
+"*" {DEBUG("\"%s\" tokenized with \'*\'", yytext); return('*');};
+"/" {DEBUG("\"%s\" tokenized with \'/\'", yytext); return('/');};
+"," {DEBUG("\"%s\" tokenized with \',\'", yytext); return(',');};
+";" {DEBUG("\"%s\" tokenized with \';\'", yytext); return(';');};
+"." {DEBUG("\"%s\" tokenized with \'.\'", yytext); return('.');};
+"#" {DEBUG("\"%s\" tokenized with \'#\'", yytext); return('#');};
 
-"("  return('(');
-")"  return(')');
-"["  return('[');
-"]"  return(']');
-"{"  return('{');
-"}"  return('}');
-">"  return('>');
-"<"  return('<');
+"(" {DEBUG("\"%s\" tokenized with \'(\'", yytext); return('(');};
+")" {DEBUG("\"%s\" tokenized with \')\'", yytext); return(')');};
+"[" {DEBUG("\"%s\" tokenized with \'[\'", yytext); return('[');};
+"]" {DEBUG("\"%s\" tokenized with \']\'", yytext); return(']');};
+"{" {DEBUG("\"%s\" tokenized with \'{\'", yytext); return('{');};
+"}" {DEBUG("\"%s\" tokenized with \'}\'", yytext); return('}');};
+">" {DEBUG("\"%s\" tokenized with \'>\'", yytext); return('>');};
+"<" {DEBUG("\"%s\" tokenized with \'<\'", yytext); return('<');};
 
-"int" return(KeyInt);
-"float" return(KeyFloat);
-"as" return (KeyAs);
-"short"  return(KeyShort);
-"long" return(KeyLong);
-"half"  return(KeyHalf);
-"double" return(KeyDouble); 
-"signed" return(KeySigned);
-"unsigned" return(Keyunsigned);
-"ref" return(KeyRef);
-"type" return(KeyType);
-"local" return(KeyLocal);
-"global" return(KeyGlobal);
-"static" return(KeyStatic);
-"if" return(KeyIf);
-"else" return(KeyElse);
-"while" return(KeyWhile);
-"in" return(KeyIn);
-"out" return(KeyOut);
-"fun" return(KeyFun);
-"==" return(OpEquals);
-"&&" return(OpAnd);
-"||" return(OpOr);
-"!!" return(OpNot);
-"^^" return(OpXor);
-"&" return(OpBitand);
-"|" return(OpBitor);
-"!" return(OpBitnot);
-"^" return(OpBitxor);
-"import" return(KeyImport);
-"silent" return(KeySilent);
-"box" return(KeyBox);
-"typeof" return(FunTypeof);
-"sizeof" return(FunSizeof);
-"filename" return(FunFilename);
-"funname" return(FunFunname);
-"lineno" return(FunLineno);
-"extsupport" return(FunExtsupport);
+"int" {DEBUG("\"%s\" tokenized with \'<KeyInt'", yytext); return(KeyInt);};
+"float" {DEBUG("\"%s\" tokenized with \'KeyFloat\'", yytext); return(KeyFloat);};
+"as" {DEBUG("\"%s\" tokenized with \'<KeyAs'", yytext); return (KeyAs);};
+"short" {DEBUG("\"%s\" tokenized with \'KeyShort\'", yytext); return(KeyShort);};
+"long" {DEBUG("\"%s\" tokenized with \'KeyLong\'", yytext); return(KeyLong);};
+"half" {DEBUG("\"%s\" tokenized with \'KeyHalf\'", yytext); return(KeyHalf);};
+"double" {DEBUG("\"%s\" tokenized with \'KeyDouble\'", yytext); return(KeyDouble);}; 
+"signed" {DEBUG("\"%s\" tokenized with \'KeySigned\'", yytext); return(KeySigned);};
+"unsigned" {DEBUG("\"%s\" tokenized with \'KeyUnsigned\'", yytext); return(KeyUnsigned);};
+"ref" {DEBUG("\"%s\" tokenized with \'KeyRef\'", yytext); return(KeyRef);};
+"type" {DEBUG("\"%s\" tokenized with \'KeyType\'", yytext); return(KeyType);};
+"local" {DEBUG("\"%s\" tokenized with \'KeyLocal\'", yytext); return(KeyLocal);};
+"global" {DEBUG("\"%s\" tokenized with \'KeyGlobal\'", yytext); return(KeyGlobal);};
+"static" {DEBUG("\"%s\" tokenized with \'KeyStatic\'", yytext); return(KeyStatic);};
+"if" {DEBUG("\"%s\" tokenized with \'KeyIf\'", yytext); return(KeyIf);};
+"else" {DEBUG("\"%s\" tokenized with \'KeyElse\'", yytext); return(KeyElse);};
+"while" {DEBUG("\"%s\" tokenized with \'KeyWhile\'", yytext); return(KeyWhile);};
+"in" {DEBUG("\"%s\" tokenized with \'KeyIn\'", yytext); return(KeyIn);};
+"out" {DEBUG("\"%s\" tokenized with \'KeyOut\'", yytext); return(KeyOut);};
+"fun" {DEBUG("\"%s\" tokenized with \'KeyFun\'", yytext); return(KeyFun);};
+"==" {DEBUG("\"%s\" tokenized with \'OpEquals\'", yytext); return(OpEquals);};
+"&&" {DEBUG("\"%s\" tokenized with \'OpAnd\'", yytext); return(OpAnd);};
+"||" {DEBUG("\"%s\" tokenized with \'OpOr\'", yytext); return(OpOr);};
+"!!" {DEBUG("\"%s\" tokenized with \'OpNot\'", yytext); return(OpNot);};
+"^^" {DEBUG("\"%s\" tokenized with \'OpXor\'", yytext); return(OpXor);};
+"&" {DEBUG("\"%s\" tokenized with \'OpBitand\'", yytext); return(OpBitand);};
+"|" {DEBUG("\"%s\" tokenized with \'OpBitor\'", yytext); return(OpBitor);};
+"!" {DEBUG("\"%s\" tokenized with \'OpBitnot\'", yytext); return(OpBitnot);};
+"^" {DEBUG("\"%s\" tokenized with \'OpBitxor\'", yytext); return(OpBitxor);};
+"import" {DEBUG("\"%s\" tokenized with \'KeyImport\'", yytext); return(KeyImport);};
+"silent" {DEBUG("\"%s\" tokenized with \'KeySilent\'", yytext); return(KeySilent);};
+"box" {DEBUG("\"%s\" tokenized with \'KeyBox\'", yytext); return(KeyBox);};
+"typeof" {DEBUG("\"%s\" tokenized with \'FunTypeof\'", yytext); return(FunTypeof);};
+"sizeof" {DEBUG("\"%s\" tokenized with \'FunSizeof\'", yytext); return(FunSizeof);};
+"filename" {DEBUG("\"%s\" tokenized with \'FunFilename\'", yytext); return(FunFilename);};
+"funname" {DEBUG("\"%s\" tokenized with \'FunFunname\'", yytext); return(FunFunname);};
+"lineno" {DEBUG("\"%s\" tokenized with \'FunLineno\'", yytext); return(FunLineno);};
+"extsupport" {DEBUG("\"%s\" tokenized with \'FunExtsupport\'", yytext); return(FunExtsupport);};
 
-[a-zA-Z_]+ { yylval.string = strdup(yytext); return(Ident); };
-[0-9]+    { yylval.string = strdup(yytext); return(ValInt); };
-\"([^\"\n])*\" {yylval.string = strdup(yytext); return(ValStr);};
-\"\"\"([^\"\n]|\\\n)*\"\"\" {yylval.string = strdup(yytext); return(ValMultistr);};
-[0-9]*\.[0-9]+ {yylval.string = strdup(yytext); return(ValFloat);};
+[0-9]+    {DEBUG("\"%s\" tokenized with \'ValInt\'", yytext); yylval.string = strdup(yytext); return(ValInt); };
+[0-9]*\.[0-9]+ {DEBUG("\"%s\" tokenized with \'ValFloat\'", yytext); yylval.string = strdup(yytext); return(ValFloat);};
+[a-zA-Z_0-9]+ {DEBUG("\"%s\" tokenized with \'Ident\'", yytext); yylval.string = strdup(yytext); return(Ident); };
+\"([^\"\n])*\" {DEBUG("\"%s\" tokenized with \'ValStr\'", yytext); yylval.string = strdup(yytext); return(ValStr);};
+\"\"\"([^\"\n]|\\\n)*\"\"\" {DEBUG("\"%s\" tokenized with \'ValMultistr\'", yytext); yylval.string = strdup(yytext); return(ValMultistr);};
 .;
 %%
diff --git a/src/yacc/parser.y b/src/yacc/parser.y
index 7415547..8dc3d64 100644
--- a/src/yacc/parser.y
+++ b/src/yacc/parser.y
@@ -24,7 +24,7 @@
 %token KeyHalf
 %token KeyDouble
 %token KeySigned
-%token Keyunsigned
+%token KeyUnsigned
 %token KeyRef
 %token KeyType
 %token KeyLocal