[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.
Massimiliano
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