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Re: generic buffer parsing cache data
From: |
Paul Pogonyshev |
Subject: |
Re: generic buffer parsing cache data |
Date: |
Sun, 1 Jul 2007 15:16:31 +0300 |
User-agent: |
KMail/1.7.2 |
martin rudalics wrote:
> > I propose that each point position could have "cached parsing data".
> > This would be an alist indexed with cache data identifier.
>
> Have you experimented with `syntax-ppss'?
I propose to add something generic. For instance, Python mode needs to
know indentation level of blocks. It seems that `syntax-ppss` doesn't
return it at all. And adding everything that might ever be needed by
some XYZ mode seems counter-productive and complicates an already complex
function and its return value.
I just mean that major modes can have needs beyond that suited by
`syntax-ppss`. And as far as I can see, they can either parse half of
the buffer each time they need something, or invent some ad-hoc custom
code for caching such data.
As a side note, I was told somewhen that `parse-partial-sexp` is not
limited to Lisp syntax. How about this amendment to documentation?
Paul
*** syntax.c 23 Jun 2007 12:18:14 +0300 1.206
--- syntax.c 01 Jul 2007 15:13:54 +0300
***************
*** 3021,3028 ****
}
DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 6,
0,
! doc: /* Parse Lisp syntax starting at FROM until TO; return status of
parse at TO.
! Parsing stops at TO or when certain criteria are met;
point is set to where parsing stops.
If fifth arg OLDSTATE is omitted or nil,
parsing assumes that FROM is the beginning of a function.
--- 3021,3029 ----
}
DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 6,
0,
! doc: /* Parse syntax starting at FROM until TO; return status of parse
at TO.
! Exact rules are determined by buffer's major mode. Parsing stops at
! TO or when certain criteria are met;
point is set to where parsing stops.
If fifth arg OLDSTATE is omitted or nil,
parsing assumes that FROM is the beginning of a function.
Re: generic buffer parsing cache data, Stefan Monnier, 2007/07/01