init commit

1 files changed, 25 insertions, 0 deletions

diff --git a/lisp.l b/lisp.l
new file mode 100644
index 0000000..329fc0f
--- /dev/null
+++ b/lisp.l
@@ -0,0 +1,25 @@
+%{
+#include <stdlib.h>
+#include "lisp.h"
+#include "lisp.tab.h"
+
+int tcnt = 0;
+%}
+
+%%
+[+-]?([0-9]+|([0-9]*\.[0-9]+))([eE][-+]?[0-9]+)? {
+                yylval.dval = atof(yytext);
+                printf("%d: NUMBER: %f\n", ++tcnt, yylval.dval);
+                return NUMBER;
+        }
+[ \t\n]+        { printf("%d: WHITESPACE\n", tcnt); return WHITESPACE; }
+"("             { printf("%d: LPAREN\n", ++tcnt); return LPAREN; }
+")"             { printf("%d: RPAREN\n", ++tcnt); return RPAREN; }
+"\."            { printf("%d: DOT\n", ++tcnt); return DOT; }
+"+"             { printf("%d: PLUS\n", ++tcnt); return PLUS; }
+"-"             { printf("%d: MINUS\n", ++tcnt); return MINUS; }
+"*"             { printf("%d: MULT\n", ++tcnt); return MULT; }
+"/"             { printf("%d: DIV\n", ++tcnt); return DIV; }
+\".*\"          { printf("%d: STRING\n", ++tcnt); return STRING; }
+.               ; // do nothing 
+%%