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/*
* lsfd-filter.c - filtering engine for lsfd
*
* Copyright (C) 2021 Red Hat, Inc.
* Copyright (C) 2021 Masatake YAMATO <yamato@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#ifndef UTIL_LINUX_LSFD_FILTER_H
#define UTIL_LINUX_LSFD_FILTER_H
#include "libsmartcols.h"
#include <stdio.h>
#include <stdbool.h>
#define LSFD_FILTER_UNKNOWN_COL_ID -1
struct lsfd_filter;
/*
* @column_name_to_id: a function converting a column name to its id.
*
* @column_name_to_id should return LSFD_FILTER_UNKNOWN_COL_ID if
* an unknown column name is given.
*/
struct lsfd_filter *lsfd_filter_new(const char *const expr, struct libscols_table *tb,
int ncols,
int (*column_name_to_id)(const char *, void *),
struct libscols_column *(*add_column_by_id)(struct libscols_table *, int, void*),
void *data);
/* Call lsfd_filter_get_errmsg() after lsfd_filter_new() to detect
* whether lsfd_filter_new() is failed or not. Returning NULL means,
* lsfd_filter_new() is successful. */
const char *lsfd_filter_get_errmsg(struct lsfd_filter *filter);
void lsfd_filter_free(struct lsfd_filter *filter);
bool lsfd_filter_apply(struct lsfd_filter *filter, struct libscols_line *ln);
/* Dumping AST. */
void lsfd_filter_dump(struct lsfd_filter *filter, FILE *stream);
#endif /* UTIL_LINUX_LSFD_FILTER_H */