This template allows branching without mw:Extension:ParserFunctions.

It uses the code `{{{3{{{1|}}}|{{{1{{{1|}}}|{{{2|}}}}}}}}}`

Cases:

• If {{{1}}} is defined and not empty, this reduces to `{{{2|}}}`
• If {{{1}}} is defined and empty, this reduces to `{{{3|}}}`
• If {{{1}}} is undefined, this reduces to `{{{3|{{{2|}}}}}}`

If the intention is to treat empty and undefined as equivalent, then:

If {{{1}}} is defined, we successfully avoid different results for {{{2}}} undefined or empty, and for {{{3}}} undefined or empty.

If {{{1}}} is undefined and {{{3}}} is defined, we successfully avoid different results for {{{2}}} undefined or empty.

If {{{1}}} and {{{3}}} are undefined, we successfully avoid different results for {{{2}}} undefined or empty.

If {{{1}}} is undefined and {{{2}}} is defined, we have {{{2}}} for {{{3}}} undefined, but empty for {{{3}}} empty. This is different if {{{2}}} is defined and not empty!

If {{{1}}} and {{{2}}} are undefined, we successfully avoid different results for {{{3}}} undefined or empty.

If {{{2}}} is defined and not empty and {{{3}}} is undefined, we get {{{2}}} if {{{1}}} is undefined, but empty if {{{1}}} is empty!

Summarizing: there is one deviating result: if {{{2}}} is defined and not empty, we get this value if {{{1}}} and {{{3}}} are both undefined, but not if one of both are empty.

With ParserFunctions we can use `{{#if:{{{1|}}}|{{{2|}}}|{{{3|}}}}}`.

## Examples

 Code Result `{{ifwp|x|y|z}}` y `{{ifwp||y|z}}` z `{{ifwp|x||z}}` `{{ifwp|x|y|}}` y `{{ifwp|x||}}` `{{ifwp||y|}}` `{{ifwp|||z}}` z `{{ifwp|||}}` `{{ifwp|2=y|3=z}}` z `{{ifwp|1=x|3=z}}` `{{ifwp|x|y}}` y `{{ifwp|2=|3=z}}` z `{{ifwp|1=|3=z}}` z `{{ifwp||y}}` `{{ifwp|2=y|3=}}` `{{ifwp|1=x|3=}}` `{{ifwp|x|}}` `{{ifwp|2=|3=}}` `{{ifwp|1=|3=}}` `{{ifwp||}}` `{{ifwp|x}}` `{{ifwp|2=y}}` y `{{ifwp|3=z}}` z `{{ifwp|}}` `{{ifwp|2=}}` `{{ifwp|3=}}` `{{ifwp}}`

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