[fpc-devel] rebuilding source form passrc parser token tree

Michael Van Canneyt michael at freepascal.org
Sat Aug 21 16:54:54 CEST 2010

On Sat, 21 Aug 2010, Graeme Geldenhuys wrote:

> Hi,
> I'm working on a project where I parse source code, then use the token
> tree to modify the source code, and write new units out again.
> I found a few limitation in fcl-passrc which prevents rebuilding
> source code from a token tree, but it was easy to fix by introducing a
> few new tokens. I'll submit a patch for this on Monday.
> Anyway, while working with fcl-passrc I noticed something really
> strange. The token list is in reverse order! Why is that?  So to
> insert for instance a new uses clause in the Interface section, I have
> to do something like this:
>  for i := tokenlist.Count-1 downto 0 do
>  begin
>     if tokenlist[i].token = tkUses then
>        ....
>  end;
> Otherwise it finds the Implemenation section's uses clause first.
> It's not hard to work with it like this (if you know about it), I just
> find it odd and wondered if there is any technical reason why the
> token tree is in reverse.

Ehm. Are you sure this is about fcl-passrc ?

Where do you see the token list ? I searched for tokenlist, but didn't
see it anywhere ? The scanner doesnt produce a list, and the parser is


More information about the fpc-devel mailing list