Re: Constructing new language

[Hans Aberg]

First note that this is the help list of Bison, and that Bison is a program
different from Yacc. Bison is also normally used with Flex, and the latter
is a program different from Lex. And Perl isn't GNU. So you won't get much
help here. Help-flex mailing list:
  address@hidden
  http://mail.gnu.org/mailman/listinfo/help-flex

You question is probably better fitted for the newsgroup comp.compilers, or
perhaps some sysop newsgroup.

Suppose you have Bison/Flex setup. Then one would probably implement USERS,
FILE, etc as tokens: Make a lookup table, and when the lexer sees an
identifier, let it check in the lookup table what token type it is, and
return that value. You must then have a way to enter identifiers onto the
lookup table. If that is done via your language, then you need some
definition clauses, for example:

%token file_key "file"
...
%%
...
definition:
    "file" NAME { put string of $2 onto lookup table }

You can a similar extensibility of the RUNNING_PROC, if each value httpd
etc. is associated with a function pointer, the latter which is put as
semantic value on the lookup table.

At 01:40 +0800 2005/02/12, sam wun wrote:
>Hi,
>
>I would like to consturct a new language to describe the standard
>configuration of the workstations and servers for my company's network.
>This will help administrator quickly identify mis-configuration of all
>1000 workstations and servers.
>
>Here is what I would like to write:
>SYSTEM : id  USERS  APPS  type  space  FILE
>USERS :  bob  sam  cindy  jenny  john  ken  ...
>APPS : RUNNING_PROC
>RUNNING_PROC : httpd  qmail  sshd  squid  ...
>FILE :  slash_root  user_root  usr  var  home  opt
>slash_root :  boot  kernel.sys  loader.conf  device.hints ...
>user_root : dot_cshrc  dot_profile  dot_ssh  ...
>usr :  bin  local  lib  libexec sbin  var  opt  ...
>var : db  crash  named  run   spool  state  lib  ...
>....
>
>Then use yacc/lex generate parser in perl, then use these information to
>further develop applicaiton to monitor configuration of all machines.
>Are these possible to be a solution to monitor the configuration of all
>machines?
>
>Thanks
>Sam
>
>
>
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