%{

#include "scanner.h"

/* --- Your code here ---
 *
 * This is where C declarations go. If you need to include
 * files for the actions below, this is where you do it.
 */

/* --- End your code --- */

extern void yyerror(char *);
%}

%option yylineno
%option noyywrap
%option 8bit
%option caseless
%option nodefault
%option outfile="scanner.cc"

/* --- Your code here ---
 *
 * This is where Flex declarations go. If you need to include
 * any such declarations, this is where you do it.
 */

/* --- End your code --- */
DIGIT [0-9]
INTEGER ("-"|[1-9]){DIGIT}*
REAL ({INTEGER}|"."){DIGIT}*(("E"|"E-"){DIGIT}+|{DIGIT}*)
LITERAL ([a-z]|[A-Z])
IDENTIFIER {LITERAL}+({LITERAL}|{DIGIT}|"_")*

BADCOMMENT "//"[^"\n""/*"]*"/*"
COMMENT "//"[^"\n"]*
temp "*/"
MCOMMENT "/*"[^("*\//)"]*"*/"

%%

if                                  return IF;
then                                return THEN;
elseif                              return ELSEIF;
else                                return ELSE;
begin                               return XBEGIN;
end                                 return XEND;
while                               return WHILE;
function                            return FUNCTION;
program                             return PROGRAM;
return                              return RETURN;
declare                             return DECLARE;
do                                  return DO;
and                                 return AND;
or                                  return OR;
not                                 return NOT;
:=                                  return ASSIGN;
">="                                return GE;
"<="                                return LE;
==                                  return EQ;
"<>"                                return NE;
array                               return ARRAY;
of                                  return OF;


{INTEGER}                           return INTEGER;
{REAL}                              return REAL;
{IDENTIFIER}                        return ID;
"\n"                                ;
{BADCOMMENT}                        printf("\nWARNING: Multiline comment inside single line comment\n");
{COMMENT}                           ;
{MCOMMENT}                          ;
<<EOF>>                             yyterminate();
.                                   return yytext[0];

%%