%{
#define _XOPEN_SOURCE 2
#include <locale.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include "expr.h"
%}

DIGIT [0-9]

%%

"|"	puts("or");
"&"	puts("and");
"="	puts("equal");
">"	puts("greater");
">="	puts("greater or equal");
"<"	puts("less");
"<="	puts("less or equal");
"!="	puts("not equal");
"+"	puts("plus");
"-"	puts("minus");
"*"	puts("times");
"/"	puts("divide");
"%"	puts("remainder");
"("	puts("lparen");
")"	puts("rparen");
{DIGIT}+	printf("number %s\n", yytext);
-{DIGIT}+	printf("negative %s\n", yytext);
.+		printf("string '%s'\n", yytext);

%%

int main(int argc, char *argv[])
{
	setlocale(LC_ALL, "");

	int c;
	while ((c = getopt(argc, argv, "")) != -1) {
		switch (c) {
		default:
			return -1;
		}
	}

	if (optind >= argc) {
		fprintf(stderr, "expr: missing operands\n");
		return 1;
	}

	size_t n = 1;
	for (int i = optind; i < argc; i++) {
		n += strlen(argv[i]) + 1;
	}

	FILE *mem = fmemopen(NULL, n, "w+");
	for (int i = optind; i < argc; i++) {
		fprintf(mem, "%s\n", argv[i]);
	}
	fprintf(mem, "\n");
	rewind(mem);

	yyin = mem;


	return yylex();
}