From bb631d0e744fa91c663a7a35195125e36c1139b0 Mon Sep 17 00:00:00 2001
From: Felix Perktold <Felix.Perktold@student.uibk.ac.at>
Date: Sun, 21 Dec 2025 00:35:10 +0100
Subject: remove WHITESPACE token, ignore whitespace in lexer

---
 lisp.l |  4 ++--
 lisp.y | 21 ++++++++-------------
 2 files changed, 10 insertions(+), 15 deletions(-)

diff --git a/lisp.l b/lisp.l
index bbeb02d..7a9eece 100644
--- a/lisp.l
+++ b/lisp.l
@@ -7,7 +7,7 @@ int tcnt = 0;
 %}
 
 %%
-[[:space:]]+      { printf("%d: WHITESPACE\n", ++tcnt); return WHITESPACE; }
+[[:space:]]+      { printf("%d: WHITESPACE\n", tcnt); /*ignore whitespace*/}
 "("             { printf("%d: LPAREN\n", ++tcnt); return LPAREN; }
 ")"             { printf("%d: RPAREN\n", ++tcnt); return RPAREN; }
 "\."            { printf("%d: DOT\n", ++tcnt); return DOT; }
@@ -31,7 +31,7 @@ int tcnt = 0;
                 return STRING;
                 }
 
-[^[:space:]\"()]+ {
+[^[:space:]\"().]+ {
                 yylval.strval = strdup(yytext);
                 printf("%d: SYMBOL: %s\n", ++tcnt, yylval.strval);
                 return SYMBOL;
diff --git a/lisp.y b/lisp.y
index dd6eddf..da1b315 100644
--- a/lisp.y
+++ b/lisp.y
@@ -20,7 +20,7 @@ static int is_integer(double x) {
 }
 %token <dval> NUMBER
 %token <strval> STRING SYMBOL
-%token <ival> LPAREN RPAREN DOT WHITESPACE
+%token <ival> LPAREN RPAREN DOT
 %token <ival> PLUS MINUS MULT DIV
 
 %type <val> sexpr atom list list_items
@@ -28,27 +28,22 @@ static int is_integer(double x) {
 %start sexprs
 
 %%
-opt_ws: /* matches no whitespace */
-      | WHITESPACE;
-
 sexprs: sexpr { print_val($1); printf("\n"); }
-      | sexprs opt_ws sexpr { print_val($3); printf("\n"); };
+      | sexprs sexpr { print_val($2); printf("\n"); };
 
 sexpr:  atom
      |  list
-     |  LPAREN opt_ws sexpr opt_ws DOT opt_ws sexpr opt_ws RPAREN
+     |  LPAREN sexpr DOT sexpr RPAREN
      {
-       $$ = cons($3, $7);
-       print_val($$);
-       printf("\n");
+       $$ = cons($2, $4);
      };
 
-list: LPAREN opt_ws list_items opt_ws RPAREN
-    { $$ = $3; };
+list: LPAREN list_items RPAREN
+    { $$ = $2; };
 
 list_items: /* empty list */ { $$ = make_nil(); }
-          | sexpr opt_ws list_items { $$ = cons($1, $3); }
-          | sexpr WHITESPACE DOT WHITESPACE sexpr { $$ = cons($1, $5); };
+          | sexpr list_items { $$ = cons($1, $2); }
+          | sexpr DOT sexpr { $$ = cons($1, $3); };
 
 atom:   NUMBER
     {
-- 
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