/*
Lexical analyser
for `flex`
*/
%{
#include "eval.tab.h" // From bison
%}

%option noinput
%option nounput
%option noyywrap

VOID [ \n\t]

%%

[0-9]+      yylval = atoi(yytext); return number; // Number token
[-*+()=/]   return yytext[0]; // Operators
{VOID}+     ; // Skip white characters
.           fprintf(stderr, "Input '%c' unknown\n", yytext[0]); // Fallback error