Seems like (at least) the API of #pos in ParserFunctions is
different from the one in StringFunctions.
{{#pos: haysack|needle|offset}}
While the StringFunctions #pos in MediaWiki 1.14 returned an
empty string when the needle was not found, the ParserFunctions
implementation of #pos in svn now returns -1.
This is most unfortunate since current usage depends on this.
Example:
{{#if: {{#pos: abcd|b}} | found | not found }}
{{#if: {{#pos: abcd|x}} | found | not found }}
Now both of these example will return "found"!
Usage scenario:
I try to use #pos in template calls to implement a sort-of-database
functionality in a mediawiki.
I have a big template that contains data in named parameters.
those parameters get passed along to a template that can select "columns"
by rendering some of those named parameters and ignoring others.
Now I want to implement "row selection" by passing along a parameter name
and a substring that should be in the value of that parameter in order
for the data to be rendered.
something like this:
{{#if: {{#pos: {{{ {{{selectionattribute}}} }}} | {{{selectionvalue}}} }} |
render_row | render_nothing }}
If I want this to work in different MediaWiki installations I need
to rely on the API of #pos.
Currently there is seems to be no way to use #pos in a way that works
on 1.14 and on 1.15-svn.
cheers
-henrik
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