%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "parser.h"

%}

%option warn nodefault

/* makes the scanner terminate after reaching <<EOF>> instead of assuming a new input was provided */
%option noyywrap
/* disable some unused functionality, add scanner tracking */
%option nounput noinput batch debug

/* gimme a reentrant parser (overkill but more pure) */
%option reentrant

%option bison-bridge


NL                  [\n]
SPACE               " "

DOWN                "D"
UP                  "U"
LEFT                "L"
RIGHT               "R"

/*general definitions*/
NUM                 [0-9]

%%

{NL}                { return NEWLINE; }
{SPACE}             { /* return SPACE; */ }
{DOWN}              { return DOWN; }
{UP}                { return UP; }
{LEFT}              { return LEFT; }
{RIGHT}             { return RIGHT; }

{NUM}+              {
                        unsigned long num = strtoul(yytext, NULL, 10);
                        yylval->num = num;
                        return NUM;
                    }

<<EOF>>             {
                        return END_OF_FILE;
                    }
.                   {
                        printf("[error] Encountered unexpected token %s\n", yytext);
                        return 0;
                    }

%%