From: Alan Mackenzie <acm@muc.de>
To: Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
Subject: HELP, PLEASE! Syntax problem!
Date: Wed, 25 Nov 2009 12:58:10 +0000 [thread overview]
Message-ID: <20091125125810.GA4734@muc.de> (raw)
Hello Stefan, Hello Emacs,
In the following fragment of code:
1 int a = foo (
2 1);
3 #define X(A, B) \
4 do { \
5 printf (A, B); \
6 } while (0)
7 int a = foo (
8 1);
, there is a C macro between lines 3 and 6. The syntax-table properties
here have been manipulated (see below). Putting point at the "(" in L5
and doing C-M-n takes point to after ")" ON LINE 8. Similar things
happen with C-M-p, C-M-u from various places inside the macro
Evidently, all syntactic properties inside the macro have been
suppressed. This is not wanted.
The manipulation is as follows:
(i) Every paren/brace/bracket inside the macro has a category text
property 'c-{}-syntax-in-cpp. This symbol has a syntax table
property, value '(1), i.e. "punctuation syntax". This is intended to
make the paren invisible to scan-lists, etc. It does this. But...
(ii) Over the entire macro is an overlay with a 'syntax-table property.
This overlay should prevail over the text property, since overlays
always do. The value of this 'syntax-table property is the actual
syntax table currently in use. The effect of this should be that all
characters in the macro should appear to have their normal syntax.
[The purpose of this is to assist a low level parsing routine in CC Mode
which needs to ignore parens inside macros, except for the macro
currently containing point.]
So, what am I doing wrong, that the syntax of the parens is invisible?
The parens are equally invisible to parse-partial-sexp. Alternatively,
could it be that scan-lists is neglecting to take account of the overlay?
Thanks in advance for the help!
--
Alan Mackenzie (Nuremberg, Germany).
next reply other threads:[~2009-11-25 12:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-25 12:58 Alan Mackenzie [this message]
2009-11-25 14:43 ` HELP, PLEASE! Syntax problem! Stefan Monnier
2009-11-25 20:30 ` Alan Mackenzie
2009-11-25 21:45 ` Stefan Monnier
2009-11-25 22:13 ` Alan Mackenzie
2009-11-26 0:12 ` Stephen J. Turnbull
2009-11-26 8:53 ` Alan Mackenzie
2009-11-26 15:48 ` Stephen J. Turnbull
2009-11-27 9:16 ` Alan Mackenzie
2009-11-27 9:56 ` David Kastrup
2009-11-27 10:44 ` Alan Mackenzie
2009-11-27 8:16 ` A Soare
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