src/lua/exec_scan_script_parse.c

   1 /* libquvi
   2  * Copyright (C) 2012  Toni Gundogdu <legatvs@gmail.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301  USA
  18  */
  19
  20 #include "config.h"
  21
  22 #include <lauxlib.h>
  23 #include <glib.h>
  24
  25 #include "quvi.h"
  26 /* -- */
  27 #include "_quvi_s.h"
  28 #include "_quvi_scan_s.h"
  29 #include "_quvi_script_s.h"
  30 /* -- */
  31 #include "lua/setfield.h"
  32 #include "lua/def.h"
  33
  34 /*
  35  * NOTE: The error messages produced in these functions are intended for
  36  * developers. They would typically be seen when a new media script is
  37  * being developed or an old one is being maintained.
  38  *
  39  * The messages should be clear, indicating the actual error, minimizing
  40  * the time spent on locating the actual problem in the script.
  41  */
  42
  43 static const gchar script_func[] = "parse";
  44
  45 static void _foreach_media_url(lua_State *l, _quvi_scan_t qs,
  46                                const gchar *script_path)
  47 {
  48   lua_pushnil(l);
  49   while (lua_next(l, LI_KEY))
  50     {
  51       if (lua_isstring(l, LI_KEY) && lua_isstring(l, LI_VALUE))
  52         {
  53           const gchar *url = lua_tostring(l, LI_VALUE);
  54           qs->url.media = g_slist_prepend(qs->url.media, g_strdup(url));
  55         }
  56       lua_pop(l, 1);
  57     }
  58   qs->url.media = g_slist_reverse(qs->url.media);
  59 }
  60
  61 /* Check for 'qargs.media_url'. */
  62 static void _chk_media_url(lua_State *l, _quvi_scan_t qs,
  63                            const gchar *script_path)
  64 {
  65   lua_pushstring(l, SS_MEDIA_URL);
  66   lua_gettable(l, LI_KEY);
  67
  68   if (lua_istable(l, LI_VALUE))
  69     _foreach_media_url(l, qs, script_path);
  70   else
  71     {
  72       g_warning("%s: %s: should return a dictionary containing "
  73                 "the `qargs.%s'",
  74                 script_path, script_func, SS_MEDIA_URL);
  75     }
  76   lua_pop(l, 1);
  77 }
  78
  79 QuviError l_exec_scan_script_parse(gpointer p, gpointer _qss,
  80                                    const gchar *data)
  81 {
  82   _quvi_script_t qss;
  83   _quvi_scan_t qs;
  84   lua_State *l;
  85
  86   qss = (_quvi_script_t) _qss;
  87   qs = (_quvi_scan_t) p;
  88
  89   l = qs->handle.quvi->handle.lua;
  90   lua_pushnil(l);
  91
  92   if (luaL_dofile(l, qss->fpath->str))
  93     luaL_error(l, "%s", lua_tostring(l, -1));
  94
  95   lua_getglobal(l, script_func);
  96
  97   if (!lua_isfunction(l, -1))
  98     {
  99       luaL_error(l, "%s: the function `%s' was not found",
 100                  qss->fpath->str, script_func);
 101     }
 102
 103   lua_newtable(l);
 104   l_set_reg_userdata(l, USERDATA_QUVI_T, (gpointer) qs->handle.quvi);
 105   l_setfield_b(l, GS_VERBOSE, qs->handle.quvi->opt.scripts.verbose);
 106   l_setfield_s(l, SS_INPUT_URL, qs->url.input->str);
 107   l_setfield_s(l, SS_CONTENT, data);
 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: */