Help:Parameter default: Difference between revisions

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The expression for the parameter name can also contain <code>|</code>, as part of full template or parameter syntax within it.

Examples, using <code><nowiki>{{x3}}</nowiki></code> containing <syntaxhighlight lang="moinwikitext" inline>{{{1}}}{{{1}}}{{{1}}}</syntaxhighlight> and <syntaxhighlight lang="moinwikitext" inline>{{t2}}</syntaxhighlight> containing <syntaxhighlight lang="moinwikitext" inline>start-{{{1}}}-middle-{{{2}}}-end</syntaxhighlight>:

*<syntaxhighlight lang="moinwikitext" inline>{{{a|b|c|d}}}</syntaxhighlight> gives <code>{{{A|b|c|d}}}</code>

*<syntaxhighlight lang="textwikitext" inline>{{{a|{{x3|b}}}}}</syntaxhighlight> gives <code>{{{A|bbb}}}</code>

*<syntaxhighlight lang="textwikitext" inline>{{{a|{{{b|c}}}}}}</syntaxhighlight> gives <code>{{{A|{{{b|c}}}}}}</code>

*<syntaxhighlight lang="moinwikitext" inline>{{{a|[[b|c]]}}}</syntaxhighlight> gives <code>{{{A|[[b|c]]}}}</code>

*<syntaxhighlight lang="moinwikitext" inline>{{{{{x3|a}}|b}}}</syntaxhighlight> gives <code>{{{aaa|b}}}</code> - parameter aaa is undefined

*<syntaxhighlight lang="textwikitext" inline>{{{{{{a|b}}}|c}}}</syntaxhighlight> gives <code>{{{{{{A|b}}}|c}}}</code> - parameter b is undefined

*<syntaxhighlight lang="moinwikitext" inline>{{{a|<nowiki>b|c</nowiki>}}}</syntaxhighlight> gives <code>{{{A|<nowiki>b|c</nowiki>}}}</code> - works fine for rendering text, but is not suitable for putting parameters b and c in a template call (there is no function for removing nowiki tags):

*:<syntaxhighlight lang="moinwikitext" inline>{{t2|{{{a|<nowiki>b|c</nowiki>}}}}}</syntaxhighlight> gives <code>start-b|c-middle-{{{2}}}-end</code>

*<syntaxhighlight lang="moinwikitext" inline>{{{a|b{{!}}c}}}</syntaxhighlight> gives <code>{{{a|b{{!}}c}}}</code>, and the bar will be interpreted by the next layer of templates.

==Expressions containing a parameter, with default==

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For comparison using a="if" and c=d="", and also the shorter class name "if" instead of "HiddenStructure", the two lines are:

<syntaxhighlight lang="wikitext">

<nowiki><span class=" if{{{b|}}} "> ... </span></nowiki>

<nowiki>{{{ span class=" if{{{b|}}} | "> ... }}}</nowikispan>

{{{ if{{{b|}}} | ... }}}

</syntaxhighlight>

In the second method the wikitext in the template is 15 characters shorter for each optional item, but each call is 4 characters ("if=|") longer.

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{{Tim|fors}}, containing:

----

<syntaxhighlight lang="moinwikitext">{{fors/aux

|v@=

|c={{{call}}}

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with {{Tim|fors/aux}}, containing:

----

<syntaxhighlight lang="textwikitext">{{{v{{{1}}}|{{{{{c}}}|{{{pc1}}}|{{{pc2}}}|{{{pc3}}}|{{{pc4}}}|{{{pv}}}={{{1}}}}}}}}

{{{v{{{2}}}|{{{s}}}{{{{{c}}}|{{{pc1}}}|{{{pc2}}}|{{{pc3}}}|{{{pc4}}}|{{{pv}}}={{{2}}}}}}}}

{{{v{{{3}}}|{{{s}}}{{{{{c}}}|{{{pc1}}}|{{{pc2}}}|{{{pc3}}}|{{{pc4}}}|{{{pv}}}={{{3}}}}}}}}</syntaxhighlight>

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In short form the latter consists of components

<syntaxhighlight lang="moinwikitext">[ v[''i''] | [s] {{[c]|[pc1]|[pc2]|[pc3]|[pc4]|[pv]=[''i'']}} ]</syntaxhighlight> (''i'' = 1, 2, 3, for ''i'' = 1 without [s])

or in terms of the parameters of the first template:

<syntaxhighlight lang="moinwikitext">[v[''i''|@] | [sep|] {{[call]|[pc1|]|[pc2|]|[pc3|]|[pc4|]|[pv|1]=[''i'']}} ]</syntaxhighlight>

This is indeed of the above-mentioned form <code>[a[b|c]|f([b])]</code>, with {{mono|1=a=v, b=''i'', c=@}}, and

<syntaxhighlight lang="moinwikitext">f(x) = [sep|] {{[call]|[pc1|]|[pc2|]|[pc3|]|[pc4|]|[pv|1]=x}}</syntaxhighlight>

The assumptions mentioned above apply for d equal to null, and provided that no [''i''] is equal to "@".

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===Variations===

Since {{code|1=v@=null}} we can also take make the concatenation the outer operation:

<syntaxhighlight lang="moinwikitext">[v[''i''|@] | [sep|]] [v[''i''|@] | {{[call]|[pc1|]|[pc2|]|[pc3|]|[pc4|]|[pv|1]=[''i'']}} ]</syntaxhighlight>

==Conditional statement==

{{Tim|if}} contains:

----

<presyntaxhighlight lang="wikitext">{{{else{{{test|}}}|{{{test{{{test|}}}|{{{then|}}}}}}}}}</presyntaxhighlight>

----

or in short form:

<syntaxhighlight lang="text">[ else[test|] | [ test[test|] | [then|] ] ]</syntaxhighlight>

If [<code>{{bracket|test]}}</code> is defined this reduces to

<syntaxhighlight lang="text">[ else[test] | [ test[test] | [then|] ] ]</syntaxhighlight>

For test equal to null this reduces to [else<code>{{bracket|]else{{!}}}}</code>; otherwise, if no parameter name starting with "test" or "else" applies except these themselves, then this reduces to [then<code>{{bracket|]then{{!}}}}</code>.

If [<code>{{bracket|test]}}</code> is undefined we get

<syntaxhighlight lang="text">[ else | [then|] ]</syntaxhighlight>

==Last-but technique==