Template:Ifwp
This template allows branching without 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
edit| 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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See also
edit