SID-00093: How to work around IF statement limitation in 4.1.1?

Status:	Unanswered	TWiki version:	4.1.1	Perl version:
Category:	CategoryAPI	Server OS:		Last update:	16 years ago

The percent IF statement in my TWiki version seems to have a problem. For example, if I run the following test:

1. percent IF{" ('T'='F' or 'T'='F') and ('T'='T' or 'T'='F' or 'T'='F')" then = "true WRONG!" else = "false CORRECT"}percent
2. percent IF{" ('T'='F' or 'T'='F') and ('T'='T' or 'T'='F')" then = "true WRONG!" else = "false CORRECT"}percent

I get the following output on my 4.1.1 version:

I get the following output:

1. true WRONG!
2. true WRONG!

But if I try it in the sandbox here with version 4.2.2, it works correctly.

1. false CORRECT
2. false CORRECT

So it seems like this is a bug that was fixed. Since we're unfortunately not going to be upgrading our version of TWiki soon, is there another way to do this test with percent IF that works around the problem? I seem to remember reading somewhere that you can't nest percent IF statements, so I don't think that will work.

I tried rewriting the statement, even with duplicating one of the parenthesized clauses with mixed success; it's hard to work around the bug without knowing what the problem actually is.

(I'm doing this as a part of a percent SEARCH format statement, and I can't use the spreadsheet IF due to quotes in the included text, so I have to stick with the IF statement.)

-- AndyEvans - 10 Feb 2009

Discussion and Answer

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