Re: Lua AST and Parsing a "C" Like language

[Lorenzo Donati <lorenzodonatibz@...>]

On 23/08/2011 0.15, HyperHacker wrote:
> On Mon, Aug 22, 2011 at 16:07, Axel Kittenberger<axkibe@gmail.com>  wrote:
[...]
> > IMPORT  WIDGET mywidget
> > {
> >     REFINE widget_name{
> >         REDEFINE TITLE "Your widget";
> >     }
> > }
[...]
> >
>
> ....how exactly are statements like "IMPORT WIDGET" made into valid Lua code?

It is not valid, to my knowledge. The closer I can come is:


-----------------------------------------------

local function data_handler( data_table )
   print( "data " .. tostring( data_table ) )
end

-- action marker tables:
WIDGET = {}

ACTIONS = {
 [ WIDGET ] = function( widget_id )
    print( "importing widget: " .. widget_id )
    return data_handler
 end

}

function  IMPORT( action_marker )
   local action = ACTIONS[ action_marker ]
   if not action then error "unknown action!" end
   return action
end

-- Here comes the content of the "config files"

IMPORT(WIDGET) "mywidget"
{
   -- do the same for the inner stuff
}

IMPORT(STUFF) "great stuff!" { } --> error! unknown action!
---------------------------------------------------------------------



But it seems a bit overcomplicated. For simple configuration needs I 
find Lua syntax already powerful as it is, without too much magic. Of 
course it depends on the level of expertise of who will be editing those 
files: if users are non-programmers more safety-nets and "syntax 
simplification layers" may be useful.

cheers.
-- Lorenzo