/*
 * Copyright (c) 2002-2015 Balabit
 * Copyright (c) 1998-2015 Balázs Scheidler
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * As an additional exemption you are allowed to compile & link against the
 * OpenSSL libraries as published by the OpenSSL project. See the file
 * COPYING for details.
 *
 */


#ifndef CSVSCANNER_H_INCLUDED
#define CSVSCANNER_H_INCLUDED

#include "syslog-ng.h"

typedef enum
{
  CSV_SCANNER_ESCAPE_NONE,
  CSV_SCANNER_ESCAPE_BACKSLASH,
  CSV_SCANNER_ESCAPE_BACKSLASH_WITH_SEQUENCES,
  CSV_SCANNER_ESCAPE_DOUBLE_CHAR,
} CSVScannerDialect;

#define CSV_SCANNER_STRIP_WHITESPACE   0x0001
#define CSV_SCANNER_GREEDY             0x0002

typedef struct _CSVScannerOptions
{
  gchar *delimiters;
  gchar *quotes_start;
  gchar *quotes_end;
  gchar *null_value;
  GList *string_delimiters;
  CSVScannerDialect dialect;
  gint expected_columns;
  guint32 flags;
} CSVScannerOptions;

void csv_scanner_options_clean(CSVScannerOptions *options);
void csv_scanner_options_copy(CSVScannerOptions *dst, CSVScannerOptions *src);
gboolean csv_scanner_options_validate(CSVScannerOptions *options);

void csv_scanner_options_set_dialect(CSVScannerOptions *options, CSVScannerDialect dialect);
void csv_scanner_options_set_flags(CSVScannerOptions *options, guint32 flags);
void csv_scanner_options_set_expected_columns(CSVScannerOptions *options, gint expected_columns);
void csv_scanner_options_set_delimiters(CSVScannerOptions *options, const gchar *delimiters);
void csv_scanner_options_set_string_delimiters(CSVScannerOptions *options, GList *string_delimiters);
void csv_scanner_options_set_quotes_start_and_end(CSVScannerOptions *options, const gchar *quotes_start,
                                                  const gchar *quotes_end);
void csv_scanner_options_set_quotes(CSVScannerOptions *options, const gchar *quotes);
void csv_scanner_options_set_quote_pairs(CSVScannerOptions *options, const gchar *quote_pairs);
void csv_scanner_options_set_null_value(CSVScannerOptions *options, const gchar *null_value);

typedef struct
{
  CSVScannerOptions *options;
  enum
  {
    CSV_STATE_INITIAL,
    CSV_STATE_COLUMNS,
    CSV_STATE_GREEDY_COLUMN,
    CSV_STATE_PARTIAL_INPUT,
    CSV_STATE_FINISH,
  } state;
  const gchar *src;
  gint current_column;
  GString *current_value;
  gchar current_quote;
} CSVScanner;

gint csv_scanner_get_current_column(CSVScanner *self);
const gchar *csv_scanner_get_current_value(CSVScanner *pstate);
gint csv_scanner_get_current_value_len(CSVScanner *self);
gboolean csv_scanner_scan_next(CSVScanner *pstate);
gboolean csv_scanner_is_scan_complete(CSVScanner *pstate);
gchar *csv_scanner_dup_current_value(CSVScanner *self);

void csv_scanner_init(CSVScanner *pstate, CSVScannerOptions *options, const gchar *input);
void csv_scanner_deinit(CSVScanner *pstate);

#endif