add cminus.l

src/cminus.l

@@ -23,33 +23,43 @@ whitespace  [ \t]+
 %%
 
 "if"            {return IF;}
-"then"          {return THEN;}
 "else"          {return ELSE;}
-"end"           {return END;}
-"repeat"        {return REPEAT;}
-"until"         {return UNTIL;}
-"read"          {return READ;}
-"write"         {return WRITE;}
-":="            {return ASSIGN;}
-"="             {return EQ;}
+"while"         {return WHILE;}
+"return"        {return RETURN;}
+"int"           {return INT;}
+"void"          {return VOID;}
+
+"="             {return ASSIGN;}
+"=="            {return EQ;}
+"!="            {return NE;}
 "<"             {return LT;}
+"<="            {return LE;}
+">"             {return GT;}
+">="            {return GE;}
 "+"             {return PLUS;}
 "-"             {return MINUS;}
 "*"             {return TIMES;}
 "/"             {return OVER;}
 "("             {return LPAREN;}
 ")"             {return RPAREN;}
+"["             {return LBRACE;}
+"]"             {return RBRACE;}
+"{"             {return LCURLY;}
+"}"             {return RCURLY;}
 ";"             {return SEMI;}
+","             {return COMMA;}
 {number}        {return NUM;}
 {identifier}    {return ID;}
 {newline}       {lineno++;}
 {whitespace}    {/* skip whitespace */}
-"{"             { char c;
+"/*"             { char now, prev;
                   do
-                  { c = input();
-                    if (c == EOF) break;
-                    if (c == '\n') lineno++;
-                  } while (c != '}');
+                  { now = input();
+                    if (now == EOF) break;
+                    else if (now == '\n') lineno++;
+                    else if (now == '/' && prev == '*') break;
+                    prev = now;
+                  } while (1);
                 }
 .               {return ERROR;}