ps2: remove comments from scanner.l

ps2/src/scanner.l

@@ -23,35 +23,17 @@ BINDING ^[a-zA-Z]+[a-zA-Z0-9_]*$
 {WHITESPACE}+           { /* Eliminate whitespace */ }
 {QUOTED}                { return STRING_TOKEN; }
 
-/*
- * TODO:
- *
- * Add the rest of the translation rules here.
- * See the lexical structure definition of the modified VSL in PS2.
- * Also see the `%token` directives in parser.y for all symbolic names that can be returned - e.g. FUNC, IF, IDENTIFIER_TOKEN.
- *
- * Hint to get you started:
- * The WHITESPACE regex defined above is not quite finished. Finish it.
- * The scanner returns STRING_TOKEN when matching the QUOTED regex above.
- * When should the scanner return a NUMBER_TOKEN, IDENTIFIER_TOKEN, etc?
- * In which specific scenarios should the scanner return keyword tokens like FUNC or PRINT?
- *
- * For operators, which are all a single char or two chars, we let each char be a separate token.
- * This is achieved by using the "catch-all" rule at the very bottom of this file.
- */
-
-  /* All other chars get returned as single char tokens */
-{func}                  { return FUNC; }
-{var}                   { return VAR; }
-{return}                { return RETURN; }
-{print}                 { return PRINT; }
-{println}               { return PRINTLN; }
-{if}                    { return IF; }
-{else}                  { return ELSE; }
-{while}                 { return WHILE; }
-{break}                 { return BREAK; }
-{and}                   { return AND; }
-{or}                    { return OR; }
+func                    { return FUNC; }
+var                     { return VAR; }
+return                  { return RETURN; }
+print                   { return PRINT; }
+println                 { return PRINTLN; }
+if                      { return IF; }
+else                    { return ELSE; }
+while                   { return WHILE; }
+break                   { return BREAK; }
+and                     { return AND; }
+or                      { return OR; }
 {NUMERIC}               { return NUMBER_TOKEN; }
 {BINDING}               { return IDENTIFIER_TOKEN; }
 .                       { return yytext[0]; }