Re: DSL in lua

[Philipp Janda <siffiejoe@...>]

Am 10.12.2012 05:22, schrieb Vasiliy Tolstov:
> 2012/12/7 Philipp Janda <siffiejoe@gmx.net>:
> > - add  +V"file" after V"directory inside the parentheses in the startrule
>
> Does it possible to rewrite example to avoid this big line in case of
> many block/rules ?

If all your blocks look the same, sure:

local btype = C( W"directory" + W"file" + W"link" + W"socket" )
-- or even: local btype = ID

startrule( "dsl", _ * (V"block")^0 * eof )
rule( "block", btype * _ * (str_E) * _ * (P"{"+E"{ expected") * _ *
               (V"owner" + V"group" + V"mode" + V"action")^0 *
               (P"}"+E"owner|group|mode|action|} expected") * _ )

Your ast nodes look slightly different then:
- the node id is "block" instead of "file", "directory", etc.
- the first sub-element is the type of the block -> "file", etc.
- all other sub-elements are shifted by one.

HTH,
Philipp