Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.arch.embedded > #18943

Re: Parsers for extensible grammars?

Show all headers | View raw

On 2014-10-23, Don Y <this@is.not.me.com> wrote:
>
> I hadn't considered the idea of expressing "new" commands in terms
> of "old"/common commands.
>
> What I am looking for is the ability to define a set of commands
> that will "always" be used/useful.  Then, allow others to add
> to that set of commands to address specific needs that are
> necessary/unique to their environment.  (i.e., the environment
> in which these common commands are deployed)
>
> Contrived example:
>
> MESSAGE <text>
> PAUSE <delay>
> STDIN <device>
> STDOUT <device>
>

[snip]

Are you familiar with how the VMS operating system handles a similar
issue for it's CLI command language ?

The VMS CLI is called DCL and DCL has an extendable command language
which allows users/programmers to add new commands, which follow
certain DCL imposed syntax rules, to the process specific command table.

Unlike with Unix and friends, much of a DCL command line, such as if a
qualifier/option is supported for this command, or if required values
for a option is missing, is actually validated by DCL before the
executable behind the command itself is actually run.

This is possible because each command has a command definition file
which describes what the list of options, their types, and what
combinations are disallowed, for each command. This command definition
file is compiled into a binary form which is directly accessible from
DCL.

While this isn't a direct match for what you are describing, it sounds
pretty close and you might get some ideas from it.

The VMS documentation is online at:

	http://h71000.www7.hp.com/doc/os84_index.html

and you want the first part of the "HP OpenVMS Command Definition,
Librarian, and Message Utilities Manual", which is available from:

	http://h71000.www7.hp.com/doc/82final/6100/aa-qsbde-te.PDF

(Ignore the Message Utilities and Librarian sections; they are not
relevant here.)

Any other manuals mentioned in this manual are also available from
the above os84_index.html link. I recommend you follow the PDF link
for each manual; the HTML documentation is not as well done as it
should be.

Simon.

PS: And yes, this is a part of my day job. :-) (For now...)

-- 
Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world

Back to comp.arch.embedded | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-22 12:14 -0700
  Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-22 12:17 -0700
  Re: Parsers for extensible grammars? Tim Wescott <seemywebsite@myfooter.really> - 2014-10-22 15:13 -0500
    Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-22 22:54 -0700
      Re: Parsers for extensible grammars? Stefan Reuther <stefan.news@arcor.de> - 2014-10-23 18:36 +0200
        Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-23 12:10 -0700
      Re: Parsers for extensible grammars? Tim Wescott <seemywebsite@myfooter.really> - 2014-10-23 13:45 -0500
        Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-23 12:15 -0700
      Re: Parsers for extensible grammars? jim.brakefield@ieee.org - 2014-10-24 07:05 -0700
        Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-24 08:04 -0700
  Re: Parsers for extensible grammars? Clifford Heath <no.spam@please.net> - 2014-10-23 08:22 +1100
    Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-22 23:25 -0700
    Re: Parsers for extensible grammars? George Neuner <gneuner2@comcast.net> - 2014-10-23 04:45 -0400
      Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-23 04:14 -0700
        Re: Parsers for extensible grammars? George Neuner <gneuner2@comcast.net> - 2014-10-23 16:49 -0400
          Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-24 07:38 -0700
            Re: Parsers for extensible grammars? George Neuner <gneuner2@comcast.net> - 2014-10-26 03:47 -0400
              Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-26 08:41 -0700
                Re: Parsers for extensible grammars? George Neuner <gneuner2@comcast.net> - 2014-10-26 14:36 -0400
                Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-26 12:37 -0700
                Re: Parsers for extensible grammars? George Neuner <gneuner2@comcast.net> - 2014-10-26 18:54 -0400
        Re: Parsers for extensible grammars? Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2014-10-25 02:02 +0000
          Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-25 01:56 -0700
            Re: Parsers for extensible grammars? Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2014-10-25 11:15 +0000
              Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-25 10:21 -0700
                Re: Parsers for extensible grammars? Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2014-10-26 01:05 +0000
                Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-25 19:37 -0700
  Re: Parsers for extensible grammars? Andrew Smallshaw <andrews@sdf.lonestar.org> - 2014-10-23 20:04 +0000
  Re: Parsers for extensible grammars? Les Cargill <lcargill99@comcast.com> - 2014-10-23 22:30 -0500
    Re: Parsers for extensible grammars? rickman <gnuarm@gmail.com> - 2014-10-25 13:36 -0400
      Re: Parsers for extensible grammars? Les Cargill <lcargill99@comcast.com> - 2014-10-25 13:14 -0500
        Re: Parsers for extensible grammars? rickman <gnuarm@gmail.com> - 2014-10-25 14:23 -0400
          Re: Parsers for extensible grammars? Les Cargill <lcargill99@comcast.com> - 2014-10-26 00:50 -0500
          Re: Parsers for extensible grammars? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-10-26 19:21 +0000
            Re: Parsers for extensible grammars? rickman <gnuarm@gmail.com> - 2014-10-26 15:29 -0400
  Re: Parsers for extensible grammars? Paul E Bennett <Paul_E.Bennett@topmail.co.uk> - 2014-10-24 09:56 +0100
    Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-24 07:46 -0700
      Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-25 19:54 -0700
        Re: Parsers for extensible grammars? Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2014-10-26 12:15 +0000
          Re: Parsers for extensible grammars? Don Y <this@is.not.me.com> - 2014-10-26 09:02 -0700
            Re: Parsers for extensible grammars? rickman <gnuarm@gmail.com> - 2014-10-26 12:13 -0400
    Re: Parsers for extensible grammars? rickman <gnuarm@gmail.com> - 2014-10-25 13:35 -0400
      Re: Parsers for extensible grammars? Paul E Bennett <Paul_E.Bennett@topmail.co.uk> - 2014-10-26 01:29 +0100
        Re: Parsers for extensible grammars? rickman <gnuarm@gmail.com> - 2014-10-25 21:11 -0400

csiph-web