error.c

#include "header.h"
#include "std.h"
#include "std_io.h"

_Noreturn void error_unexpected_token(const struct Token *tokvec,
                                      const char *str)
{
	fprintf(stderr, "Unexpected token: `");
	print_token_at(tokvec);
	fprintf(stderr, "` while expecting %s. \n", str);
	fprintf(stderr, "Next token: `");
	print_token_at(tokvec + 1);
	fprintf(stderr, "`\n");
	fprintf(stderr, "Previous token: `");
	print_token_at(tokvec - 1);
	/* it does not fail if tokvec[0] was the
	   first token, since there always is at least one token (BEGINNING) */
	fprintf(stderr, "`\n");
	exit(EXIT_FAILURE);
}

_Noreturn void simple_error(const char *str)
{
	fprintf(stderr, "%s", str);
	exit(EXIT_FAILURE);
}

void expect_and_consume(const struct Token **ptr_tokvec, enum TokenKind kind,
                        const char *str)
{
	const struct Token *tokvec = *ptr_tokvec;

	if (tokvec[0].kind != kind) {
		error_unexpected_token(tokvec, str);
	}
	++tokvec;
	*ptr_tokvec = tokvec;
}

_Noreturn void unsupported(const char *str)
{
	fprintf(stderr, "unsupported: %s\n", str);
	exit(EXIT_FAILURE);
}