Template:Ifnotempty

With this template #if can be used in a way such that it does not strip spaces and newlines from the "then" and "else" part. For evaluating the condition spaces and newlines are stripped like with ParserFunctions.

Usage
Compare: Note that, unlike parser functions, templates require writing equals signs in values of unnamed parameters as
 * gives "p"
 * gives "q"
 * gives ""

For full substitution, simply use or. If the condition contains a parser function, template, or variable, that should be substituted too. Optionally the "then" or "else" part can also be substituted.

Expansion depth limit
13 levels allowed:

gives a

gives a

Internal technical details
For evaluating the condition the template uses the actual parser function; however, not directly with p and q, because this strips spaces and newlines from the result, but with index values 1 and 2. The result can be 1, 2. The template with the applicable name is called (Template:P1 or Template:P2), with as parameters p and q.