src/lua/exec_scan_script_parse.c

   1 /* libquvi
   2  * Copyright (C) 2012  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_scan_s.h"
  39 #include "_quvi_script_s.h"
  40 /* -- */
  41 #include "lua/setfield.h"
  42 #include "lua/def.h"
  43
  44 static const gchar script_func[] = "parse";
  45
  46 static void _foreach_media_url(lua_State *l, _quvi_scan_t qs,
  47                                const gchar *script_path)
  48 {
  49   lua_pushnil(l);
  50   while (lua_next(l, LI_KEY))
  51     {
  52       if (lua_isstring(l, LI_KEY) && lua_isstring(l, LI_VALUE))
  53         {
  54           const gchar *url = lua_tostring(l, LI_VALUE);
  55           qs->url.media = g_slist_prepend(qs->url.media, g_strdup(url));
  56         }
  57       lua_pop(l, 1);
  58     }
  59   qs->url.media = g_slist_reverse(qs->url.media);
  60 }
  61
  62 /* Check for 'qargs.media_url'. */
  63 static void _chk_media_url(lua_State *l, _quvi_scan_t qs,
  64                            const gchar *script_path)
  65 {
  66   lua_pushstring(l, SS_MEDIA_URL);
  67   lua_gettable(l, LI_KEY);
  68
  69   if (lua_istable(l, LI_VALUE))
  70     _foreach_media_url(l, qs, script_path);
  71   else
  72     {
  73       g_warning("%s: %s: should return a dictionary containing "
  74                 "the `qargs.%s'",
  75                 script_path, script_func, SS_MEDIA_URL);
  76     }
  77   lua_pop(l, 1);
  78 }
  79
  80 QuviError l_exec_scan_script_parse(gpointer p, gpointer _qss,
  81                                    const gchar *data)
  82 {
  83   _quvi_script_t qss;
  84   _quvi_scan_t qs;
  85   lua_State *l;
  86
  87   qss = (_quvi_script_t) _qss;
  88   qs = (_quvi_scan_t) p;
  89
  90   l = qs->handle.quvi->handle.lua;
  91   lua_pushnil(l);
  92
  93   if (luaL_dofile(l, qss->fpath->str))
  94     luaL_error(l, "%s", lua_tostring(l, -1));
  95
  96   lua_getglobal(l, script_func);
  97
  98   if (!lua_isfunction(l, -1))
  99     {
 100       luaL_error(l, "%s: the function `%s' was not found",
 101                  qss->fpath->str, script_func);
 102     }
 103
 104   lua_newtable(l);
 105   l_set_reg_userdata(l, USERDATA_QUVI_T, (gpointer) qs->handle.quvi);
 106   l_setfield_s(l, SS_INPUT_URL, qs->url.input->str, -1);
 107   l_setfield_s(l, SS_CONTENT, data, -1);
 108
 109   if (lua_pcall(l, 1, 1, 0))
 110     {
 111       g_string_assign(qs->handle.quvi->status.errmsg, lua_tostring(l, -1));
 112       return (QUVI_ERROR_SCRIPT);
 113     }
 114
 115   if (!lua_istable(l, -1))
 116     {
 117       static const gchar *_E =
 118         "%s: %s: must return a dictionary, this is typically the `qargs'";
 119
 120       luaL_error(l, _E, qss->fpath->str, script_func);
 121     }
 122
 123   _chk_media_url(l, qs, qss->fpath->str);
 124   lua_pop(l, 1);
 125
 126   return (QUVI_OK);
 127 }
 128
 129 /* vim: set ts=2 sw=2 tw=72 expandtab: */