General comment searching?

General comment searching?

[Douglas Lewan]

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Hi,

I'd like to have search/match code that recognizes comments in a variety of
languages (C, perl, lisp, etc.).

My natural inclination would to write a regular expression based on the
syntax of the characters that make up comments in the style of, say, "\\s-+"
for whitespace.  That is, I would like a single regular expression to match
both

    1. "(*" in Pascal as a comment start and 
    2. "/*" in C as a comment start.

I can't see any way to get at the comment information for, say, "/" in C
since it's not in the syntax _class_, but hidden in the flags.

Can anyone help me?

Thanks.

Hi,

The introduction of (pop-tag-mark) in emacs 20 answered a real need for me
(and I assume many, many others).

It is clearly great for traversing back up a stack I've already traversed
down, but sometimes I want to go the other way around:  Find possible
callers of a function.  To that end I've written a simple (tag-come-from)
function that wraps (grep) with a bit of tag-relevant code.  (The code for
(tag-come-from) can be found below.)

By and large it works well, but occasionally it leaves a inappropriate match
in the *grep* buffer.  For example, looking for uses of that tag 'main' I
normally get in part:

    ...
    miner_peer.c:289:main(int argc, char **argv) {
    MultiBucket.c:49:    int remainder[MAXBKTS];
    rmipc.c:27:main(int argc, char **argv)
    ...


The word "remainder" should not be there even though many unwanted matches
are in fact eliminated.

Sounds like an opportunity for debugging, but in either the "ordinary
debugger" or Edebug the right thing happens, i.e. "remainder" is eliminated.
Further, if I uncomment the line marked with the arrow below, the right
thing happens too.

Have I done something wrong?  Am I missing something?  Is there a bug to
report here?  (And just what would it be?)

Thanks in advance.

,Doug
Douglas Lewan
ADIR Technologies
732 836 3916
dlewan@adirtech.com

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