Template:Ifwp
transcluded from Template:Ifwp/doc. (Edit | history)Note to editors: Please don't categorize this template by editing it directly. Instead, place the category in its documentation page, in its "includeonly" section.
This template allows branching without Extension:ParserFunctions.
It uses the code {{{3{{{1|}}}|{{{1{{{1|}}}|{{{2|}}}}}}}}}
Cases:
- If __p1= is defined and not empty, this reduces to
{{{2|}}} - If __p1= is defined and empty, this reduces to
{{{3|}}} - If __p1= is undefined, this reduces to
{{{3|{{{2|}}}}}}
If the intention is to treat empty and undefined as equivalent, then:
If __p1= is defined, we successfully avoid different results for __p2= undefined or empty, and for __p3= undefined or empty.
If __p1= is undefined and __p3= is defined, we successfully avoid different results for __p2= undefined or empty.
If __p1= and __p3= are undefined, we successfully avoid different results for __p2= undefined or empty.
If __p1= is undefined and __p2= is defined, we have __p2= for __p3= undefined, but empty for __p3= empty. This is different if __p2= is defined and not empty!
If __p1= and __p2= are undefined, we successfully avoid different results for __p3= undefined or empty.
If __p2= is defined and not empty and __p3= is undefined, we get __p2= if __p1= is undefined, but empty if __p1= is empty!
Summarizing: there is one deviating result: if __p2= is defined and not empty, we get this value if __p1= and __p3= 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}}
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y |
{{ifwp||y|z}}
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z |
{{ifwp|x||z}}
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{{ifwp|x|y|}}
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y |
{{ifwp|x||}}
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{{ifwp||y|}}
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{{ifwp|||z}}
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z |
{{ifwp|||}}
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{{ifwp|2=y|3=z}}
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z |
{{ifwp|1=x|3=z}}
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{{ifwp|x|y}}
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y |
{{ifwp|2=|3=z}}
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z |
{{ifwp|1=|3=z}}
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z |
{{ifwp||y}}
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{{ifwp|2=y|3=}}
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{{ifwp|1=x|3=}}
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{{ifwp|x|}}
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{{ifwp|2=|3=}}
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{{ifwp|1=|3=}}
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{{ifwp||}}
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{{ifwp|x}}
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{{ifwp|2=y}}
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y |
{{ifwp|3=z}}
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z |
{{ifwp|}}
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{{ifwp|2=}}
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{{ifwp|3=}}
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{{ifwp}}
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