src/lua/exec_subtitle_export_script_ident.c

   1 /* libquvi
   2  * Copyright (C) 2013  Toni Gundogdu <legatvs@gmail.com>
   3  *
   4  * This file is part of libquvi <http://quvi.sourceforge.net/>.
   5  *
   6  * This library is free software: you can redistribute it and/or
   7  * modify it under the terms of the GNU Affero General Public
   8  * License as published by the Free Software Foundation, either
   9  * version 3 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Affero General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Affero General
  17  * Public License along with this library.  If not, see
  18  * <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /*
  22  * NOTE: The error messages produced in these functions are intended for
  23  *       developers. They would typically be seen when a new script is
  24  *       being developed or an old one is being maintained.
  25  *
  26  *       These messages should be clear, indicating the actual error,
  27  *       minimizing the time spent on locating the problem in the script.
  28  */
  29
  30 #include "config.h"
  31
  32 #include <lauxlib.h>
  33 #include <glib.h>
  34
  35 #include "quvi.h"
  36 /* -- */
  37 #include "_quvi_s.h"
  38 #include "_quvi_subtitle_export_s.h"
  39 #include "_quvi_script_s.h"
  40 /* -- */
  41 #include "lua/setfield.h"
  42 #include "lua/chk.h"
  43 #include "lua/def.h"
  44
  45 static const gchar script_func[] = "ident";
  46
  47 static QuviError _chk_results(lua_State *l, _quvi_script_t qs)
  48 {
  49   gboolean r = FALSE;
  50
  51   lua_pushnil(l);
  52   while (lua_next(l, LI_KEY))
  53     {
  54       l_chk_assign_s(l, SUES_EXPORT_FORMAT, qs->export.format, TRUE, FALSE);
  55       l_chk_assign_b(l, SUES_CAN_EXPORT_DATA, &r);
  56       lua_pop(l, 1);
  57     }
  58
  59   if (qs->export.format->len ==0)
  60     {
  61       luaL_error(l, "%s: %s: the returned dictionary must contain "
  62                  "a string value `%s'",
  63                  qs->fpath->str, script_func, SUES_EXPORT_FORMAT);
  64     }
  65   lua_pop(l, 1);
  66
  67   return ((r == TRUE)
  68           ? QUVI_OK
  69           : QUVI_ERROR_NO_SUPPORT);
  70 }
  71
  72 QuviError l_exec_subtitle_export_script_ident(gpointer p, GSList *sl)
  73 {
  74   _quvi_subtitle_export_t qse;
  75   _quvi_script_t qs;
  76   lua_State *l;
  77
  78   qse = (_quvi_subtitle_export_t) p;
  79   l = qse->handle.quvi->handle.lua;
  80
  81   qs = (_quvi_script_t) sl->data;
  82   lua_pushnil(l);
  83
  84   if (luaL_dofile(l, qs->fpath->str))
  85     luaL_error(l, "%s", lua_tostring(l, -1));
  86
  87   lua_getglobal(l, script_func);
  88
  89   if (!lua_isfunction(l, -1))
  90     {
  91       static const gchar *_E = "%s: the function `%s' was not found";
  92       luaL_error(l, _E, qs->fpath->str, script_func);
  93     }
  94
  95   lua_newtable(l);
  96   l_setfield_s(l, SUES_TO_FORMAT, qse->format.to->str, -1);
  97
  98   if (lua_pcall(l, 1, 1, 0))
  99     {
 100       g_string_assign(qse->handle.quvi->status.errmsg, lua_tostring(l, -1));
 101       return (QUVI_ERROR_SCRIPT);
 102     }
 103
 104   if (!lua_istable(l, -1))
 105     {
 106       luaL_error(l, "%s: %s: must return a dictionary",
 107                  qs->fpath->str, script_func);
 108     }
 109   return (_chk_results(l, qs));
 110 }
 111
 112 /* vim: set ts=2 sw=2 tw=72 expandtab: */