Re: Existence of a luabind::execute_file function ?

hi,

here's what we do in our project, maybe it's of some help. It's deliberately 
only the doString part because file loading is a bit more involved (multiple 
possible locations). The return value/exception throwing combination is 
debatable.

best,
Tony

int State::doString(const std::string& inData)
{
  // execute the loaded file and handle errors
  int err = luaL_loadstring(state, inData.c_str());
  if(!err)
  {
    err = luabind::detail::pcall(state, 0, LUA_MULTRET);
  }
  if(err)
  {
    std::string errcode;
    switch(err)
    {
      case LUA_YIELD:errcode="LUA_YIELD";break;
      case LUA_ERRRUN:errcode="LUA_ERRRUN";break;
      case LUA_ERRSYNTAX:errcode="LUA_ERRSYNTAX";break;
      case LUA_ERRMEM:errcode="LUA_ERRMEM";break;
      case LUA_ERRERR:errcode="LUA_ERRERR";break;
      default:errcode="??";break;
    }
    std::string errstring;
    const char* errstringc = lua_tostring(state, -1);
    lua_pop(state,1);
    if (errstringc != NULL)
    {
      errstring = errstringc;
      throw LoadException(getScriptFilename(inData, inData) +" "+ errcode   +": 
"+ errstring);
    }
    else
    {
      throw LoadException(getScriptFilename(inData, inData) +" "+ errcode  +"");
    }
  }
  return err;
}




________________________________
Von: Teto <[email protected]>
An: Ryan Pavlik <[email protected]>
CC: [email protected]
Gesendet: Mittwoch, den 16. März 2011, 0:11:56 Uhr
Betreff: Re: [luabind] Existence of a luabind::execute_file function ?

Just want to make sure before starting and after consulting the pil 
(http://www.lua.org/pil/25.2.html) and this page : 
http://www.corsix.org/content/common-lua-pitfall-loading-code, I should push the 
error handler function on the stack before loading file ( since loading file 
basically embeds the file into a function and pushes it onto the stack). Only 
then can I call pcall ?

So in lua: 
-push error handler
-load file
-lua_pcall(L, 0,LUA_MULTRET, lua_gettop(L)-1)  ?

I could also use luabind::detail::pcall(L,1,0) so that the error handler is 
"lua_inserted" under the loaded file chunk ?


Nb: Just to be sure is answer http://www.luafaq.org/#T7.6 correct ? it looks 
correct to me but as it is an unofficial FAQ...


On Mon, Mar 14, 2011 at 3:43 AM, Ryan Pavlik <[email protected]> wrote:

While it's not as elegant, you could run the string "dofile('whatever')".  Or, 
just fork Luabind on Github and add the header you'd like yourself. I'd find it 
handy too.
>
>
>Ryan
>
>
>On Sun, Mar 13, 2011 at 5:58 PM, Teto <[email protected]> wrote:
>
>Hi,
>>
>>I started lua with luabind using it (or wanting to use it) as a C++
>>wrapper for lua. It allowed me to run my first lua script very quickly
>>(in a day) but also allowed me to avoid learning about lua inner
>>mechanisms (which was a bad thing, I had quite some difficulties to
>>getmyself learning the C api after that, I would recommand anyone to
>>start using lua without luabind and after some time to resort to
>>luabind)
>>I was wrong since many things are not possible with luabind alone. You
>>have to use lua functions. I was wondering to what extent luabind was
>>meant to complete lua. For example, is there any project to create a
>>function that replaces lua_loadfile || lua_pcall such as int
>>luabind::execute_file(const char*).
>>It would basically push the error callback function, load the file
>>chunk and then do an appropriate pcall and pop the callback function.
>>Does that go into the attribution of luabind ? or is luabind focusing
>>on binding only ?
>>
>>Regards
>>
>>
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>
>
>-- 
>Ryan Pavlik
>HCI Graduate Student
>Virtual Reality Applications Center
>Iowa State University
>
>[email protected]
>http://academic.cleardefinition.com
>Internal VRAC/HCI Site: http://tinyurl.com/rpavlik
>

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