/* xgettext Desktop Entry backend.
   Copyright (C) 2014-2015 Free Software Foundation, Inc.

   This file was written by Daiki Ueno <ueno@gnu.org>, 2014.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

/* Specification.  */
#include "x-desktop.h"

#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "message.h"
#include "xgettext.h"
#include "error.h"
#include "error-progname.h"
#include "xalloc.h"
#include "xvasprintf.h"
#include "hash.h"
#include "gettext.h"
#include "read-desktop.h"
#include "po-charset.h"
#include "c-ctype.h"

#define _(s) gettext(s)

#define SIZEOF(a) (sizeof(a) / sizeof(a[0]))

/* ====================== Keyword set customization.  ====================== */

/* The syntax of a Desktop Entry file is defined at
   http://standards.freedesktop.org/desktop-entry-spec/latest/index.html

   Basically, values with 'localestring' type can be translated.

   The type of a value is determined by looking at the key associated
   with it.  The list of available keys are listed on:
   http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s05.html  */

static hash_table keywords;
static bool default_keywords = true;

static void
add_keyword (const char *name, hash_table *keywords, bool is_list)
{
  if (name == NULL)
    default_keywords = false;
  else
    {
      if (keywords->table == NULL)
        hash_init (keywords, 100);

      desktop_add_keyword (keywords, name, is_list);
    }
}

void
x_desktop_keyword (const char *name)
{
  add_keyword (name, &keywords, false);
}

static void
init_keywords (void)
{
  if (default_keywords)
    {
      if (keywords.table == NULL)
        hash_init (&keywords, 100);

      desktop_add_default_keywords (&keywords);
      default_keywords = false;
    }
}

typedef struct extract_desktop_reader_ty extract_desktop_reader_ty;
struct extract_desktop_reader_ty
{
  DESKTOP_READER_TY

  message_list_ty *mlp;
};

static void
extract_desktop_handle_group (struct desktop_reader_ty *reader,
                              const char *group)
{
  savable_comment_reset ();
}

static void
extract_desktop_handle_pair (struct desktop_reader_ty *reader,
                             lex_pos_ty *key_pos,
                             const char *key,
                             const char *locale,
                             const char *value)
{
  extract_desktop_reader_ty *extract_reader =
    (extract_desktop_reader_ty *) reader;
  void *keyword_value;

  if (!locale                   /* Skip already translated entry.  */
      && hash_find_entry (&keywords, key, strlen (key), &keyword_value) == 0)
    {
      bool is_list = (bool) keyword_value;

      remember_a_message (extract_reader->mlp, NULL,
                          desktop_unescape_string (value, is_list),
                          null_context, key_pos,
                          NULL, savable_comment);
    }
  savable_comment_reset ();
}

static void
extract_desktop_handle_comment (struct desktop_reader_ty *reader,
                                const char *buffer)
{
  size_t buflen = strlen (buffer);
  size_t bufpos = 0;

  while (bufpos < buflen
         && c_isspace (buffer[bufpos]))
    ++bufpos;
  while (buflen >= bufpos
         && c_isspace (buffer[buflen - 1]))
    --buflen;
  if (bufpos < buflen)
    {
      char *comment = xstrdup (buffer);
      comment[buflen] = 0;
      savable_comment_add (&comment[bufpos]);
      free (comment);
    }
}

static void
extract_desktop_handle_blank (struct desktop_reader_ty *reader,
                              const char *s)
{
  savable_comment_reset ();
}

desktop_reader_class_ty extract_methods =
  {
    sizeof (extract_desktop_reader_ty),
    NULL,
    NULL,
    extract_desktop_handle_group,
    extract_desktop_handle_pair,
    extract_desktop_handle_comment,
    extract_desktop_handle_blank
  };

void
extract_desktop (FILE *f,
                 const char *real_filename, const char *logical_filename,
                 flag_context_list_table_ty *flag_table,
                 msgdomain_list_ty *mdlp)
{
  desktop_reader_ty *reader = desktop_reader_alloc (&extract_methods);
  extract_desktop_reader_ty *extract_reader =
    (extract_desktop_reader_ty *) reader;

  init_keywords ();
  xgettext_current_source_encoding = po_charset_utf8;

  extract_reader->mlp = mdlp->item[0]->messages;

  desktop_parse (reader, f, real_filename, logical_filename);
  desktop_reader_free (reader);

  reader = NULL;
}
