Re: Short function definition syntax; thoughts on Lua

["Juris Kalnins" <juris@...>]

On Mon, 07 Dec 2009 10:10:27 +0200, steve donovan  
<steve.j.donovan@gmail.com> wrote:

> This is the best way to accommodate everybody and their 'special
> needs'.  I'd suggest looking into a new API for the token-filter patch
> so (a) it has minimal impact on programs that don't need it (b) that
> it cannot be accidently invoked by defining a global FILTER and (c)
> that different token filters can co-exist.

Token filter patch is rather invasive, does not really provide C interface,
and bulks up code. What would be good to see is something similar to the
lua_Reader callback interface, and have the standard Lua lexer
implemented using this interface. Something similar to:

int mylex(lua_State *L, void *data, void *dst) {
  struct MyLexData *d = (struct MyLexData *) data;
  ...
    return TK_LE;
  ...
    return luaX_string(L, dst, TK_GLOBAL, s, len);
  ...
    return luaX_num(L, dst, n);
  ...
  return TK_EOS;
}

...
  MyLexData d;
  ...
  lua_xload(L, &mylex, &d);