William Allen Simpson wrote:
> {{{{{subst|}}}#if:{{{par1|}}}|[[Category:{{{par1}}}{{{{{subst|}}}#if:{{{key1|}}}{{{{{subst|}}}!}}{{{key1}}}}}]]
> <!-- bpar1 -->
> }}{{{{{subst|}}}#if:{{{par2|}}}|[[Category:{{{par2}}}{{{{{subst|}}}#if:{{{key2|}}}{{{{{subst|}}}!}}{{{key2}}}}}]]
> <!-- bpar2 -->
> }}{{{{{subst|}}}#if:{{{par3|}}}|[[Category:{{{par3}}}{{{{{subst|}}}#if:{{{key3|}}}{{{{{subst|}}}!}}{{{key3}}}}}]]
> <!-- bpar3 -->
> }}
Nothing like a wikitext puzzle to start off your day.
> Did the evaluation order change, so the inner {{subst:!}} happens first
> instead of second, and loses the C parameter (interpreting it as "else")?
{{subst:!}} no longer works as a separator between parser function
parameters, it just works as a literal character. Welcome to MediaWiki
1.12. See:
http://meta.wikimedia.org/wiki/MNPP
For those playing at home, the simplified test case is:
{{#if: a {{!}} b }}
The condition "a | b" is true, but no return value is specified, so
the default return is used, i.e. an empty string
> And the leading and trailing linebreaks are slurped up and ignored?
Whitespace at the beginning and end of a parameter to #if, #ifeq,
#switch, etc. is stripped. This was always the case in HTML mode, at
least since MW 1.7. It's possible MW 1.12 changed it for subst mode.
> Any known work around? (I tried searching meta and elsewhere, but no joy.)
Use "|" instead of "{{{{{subst|}}}!}}". Not only will it work, it'll
be easier to read.
The workarounds that come to mind for the line break issue are fairly
obscure and complex. If I were you I'd just put the categories on the
same line and be done with it.
-- Tim Starling
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