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Re: Finding if a structure tag name is defined? [message #36688]

Wed, 15 October 2003 11:51

mvukovic
Messages: 63
Registered: July 1998

Member

wmc@bas.ac.uk wrote in message news:<3f8bebd3@news.nwl.ac.uk>...
> I want to know if a given keyword has been passed down via _extra, so
> I said "if (n_elements(e.c_linestyle) ne 0)" which of course doesn't
> work because if it isn't there you can't say e.linestyle (bring on
> perl...). I can use tag names to get all the tags, then search through
> for a match, but that seems silly and ugly. What is the correct way
> to find if a given structure has a certain tag in it? (And why
> couldn't I find the answer buried within DF's site ;-)?
>
> -W.

You may find the following routine usefull. It uses regular
expression matching to check for matches.

You may off course, combine it with some of the type-checking routines
posted on this thread

Mirko

function WhereKwdLike,vsStringVector,sString,cFound,_extra=_extra
; function returns matches of String in String Vector. A match occurs
; when the string, of length N matches the first N characters of a
; vector element. This function mimics the behavior of IDL when it
; matches an incomplete keyword.

;; Use a regular expression match. We match the String vector against
;; the string regular expression. In the regular expression, ^
matches
;; the string beginning and .* will match any number of characters
viMatches=StRegEx(vsStringVector,'^'+sString+'.*',/Fold_Case , $
_extra=_extra)
viFound=where(viMatches eq 0,cFound)
return,viFound
end

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[Message index]

		Re: Finding if a structure tag name is defined? By: mvukovic on Wed, 15 October 2003 11:51
		Re: Finding if a structure tag name is defined? By: Mark Hadfield on Tue, 14 October 2003 19:35
		Re: Finding if a structure tag name is defined? By: David Fanning on Tue, 14 October 2003 15:19
		Re: Finding if a structure tag name is defined? By: wmconnolley on Tue, 14 October 2003 14:53
		Re: Finding if a structure tag name is defined? By: David Fanning on Tue, 14 October 2003 09:55
		Re: Finding if a structure tag name is defined? By: R.Bauer on Tue, 14 October 2003 09:34
		Re: Finding if a structure tag name is defined? By: David Fanning on Tue, 14 October 2003 07:32

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