[cad-linux] Re: An open CAD file format

  • From: Massimiliano Mirra <mmirra@xxxxxxxxx>
  • To: cad-linux@xxxxxxxxxxxxx
  • Date: Sun, 07 Sep 2003 21:56:28 +0200

Bakul Shah <bakul@xxxxxxxxxxxxx> writes:

> Is this your only objection?!  It seems to me it wouldn't be
> hard to add sexp support to grep or even write sexpgrep from
> scratch!  Example use of such a hypothetical program:

I agree.  In fact I guess it could be done n less than twenty lines in
whatever implementation of Scheme.  There are many tools that would
need an equivalent sexp-flavour, though.

> As you can see, the main problem is figuring out exactly what
> to show....  Perhaps it should be the smallest enclosing
> context or the smallest enclosing context if the whole line
> is shown.

As Bruno pointed out, it is less of an issue when structure
information is mapped to directory hierarchy rather than to a file.
But the file format is bound to change drastically, so I am not
discarding any of your considerations.

By the way, I just found this:

Package: sgrep
Description: a tool to search a file for structured pattern
 Sgrep (structured grep) is a tool for searching text files and
 filtering text streams for structured criteria. Sgrep implements
 a query language based on so called region expressions.
 Like grep, sgrep can be used for any kind of text files. However it
 is most useful for text files containing some kind of structured text.
 A file containing structured text could be defined as a file, which
 obeys some syntax. Examples of structured text files are SGML, HTML,
 C, Tex and mail files.

> Unix tools such as grep, awk & sed are fine for line oriented
> data but they don't handle nest structured data very well.  I
> believe it wouldn't be too hard to extend exiting tools such
> that the record delimiter is a matching pair of parentheses.

Mmmh, record delimiter usually define sequential data items, I don't
know to what point this is interchangeable with nesting/recursive
structures as defined by sexps.


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