RE: LPEG for C++

[Ben Harper <ben@...>]

Thanks!

That's exactly what I was looking for. Looks like it parses my existing (small) sources correctly.

I'll post further as applicable...



-----Original Message-----
From: lua-bounces@bazar2.conectiva.com.br [mailto:lua-bounces@bazar2.conectiva.com.br] On Behalf Of Peter Cawley
Sent: Friday, September 18, 2009 2:48 PM
To: Lua list
Subject: Re: LPEG for C++

You might be interested in reusing some code I wrote recently. It is a
Lua/LPEG creation to parse C++ source files, extract information, and
then output it in wiki markup. For example, given a C++ file looking
something along the lines of:

static int l_map_getsize(lua_State *L)
{
    THMap* pMap = luaT_testuserdata<THMap>(L);
    lua_pushinteger(L, pMap->getWidth());
    lua_pushinteger(L, pMap->getHeight());
    return 2;
}
//
// Then later on:
//
luaT_class(THMap, l_map_new, "map", iMapMT);
luaT_setfunction(l_map_getsize, "size");
// ...
luaT_endclass();

The Lua/LPEG script can parse the above, and work out that the Lua
class "map" wraps the C++ class "THMap", and that the "size" method on
a Lua "map" class calls the "l_map_getsize" glue function, which in
turn calls THMap::getWidth and THMap::getHeight. The final output
would be the following Google Code wiki markup:

=== TH.map ===
Wraps the C++ class *{{{THMap}}}*.
|| *Lua method* || *C++ function(s)* || *Glue function* ||
|| *{{{size}}}* || *{{{THMap::getWidth}}}*, *{{{THMap::getHeight}}}*
|| *{{{l_map_getsize}}}* ||

You can find the source code at
http://code.google.com/p/corsix-th/source/browse/trunk/LDocGen/ -
there are three Lua files there:
c_tokenise.lua - The LPEG grammar for turning a C/C++ file into an
array of tokens. Also has code for pretty printing a token array as
HTML, but that code can be ignored.
helpers.lua - A collection of helper functions. The most important of
these is tokens_gfind, which provides functionality similar to
string.gmatch - it finds a string of tokens in an array of tokens,
ignoring whitespace tokens.
main.lua - The actual application logic

Let me know if it proves useful,
Peter

On Fri, Sep 18, 2009 at 12:43 PM, Ben Harper <ben@imqs.co.za> wrote:
> I want to parse C++ header files (not for classes, just Plain Old C
> functions), and automatically generate entry points for another language.
>
>
>
> Has anybody created an LPEG grammar capable of parsing a reasonable subset
> of C++?
>
>
>
> Thanks,
>
> Ben