Editing Module:Check for unknown parameters/doc

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{{Lua|Module:If preview|noprotcat=yes}}

'''Module:Check for unknown parameters''' is used to check for uses of unknown parameters in a template or module. It may be appended to a template at the end or called directly from a module.

== Usage ==
=== From a template ===
To sort entries into a tracking category by parameter, use:
* {{mlx|Check for unknown parameters|check|unknown{{=}}<nowiki>[</nowiki>[Category:Some tracking category|_VALUE_]]|arg1|arg2|arg3|argN}}

To sort the entries into a tracking category by parameter with a preview error message, use:
* {{mlx|Check for unknown parameters|check|unknown{{=}}<nowiki>[</nowiki>[Category:Some tracking category|_VALUE_]]|preview{{=}}unknown parameter "_VALUE_"|arg1|arg2|...|argN}}

For an explicit red error message, use:
* {{mlx|Check for unknown parameters|check|unknown{{=}}&lt;span class{{=}}"error">Sorry, I don't recognize _VALUE_&lt;/span>|arg1|arg2|...|argN}}

To use Lua patterns, use:
* {{mlx|Check for unknown parameters|check|unknown{{=}}<nowiki>[</nowiki>[Category:Some tracking category|_VALUE_]]|preview{{=}}unknown parameter "_VALUE_"|arg1|arg2|...|argN|regexp1{{=}}header[%d]+|regexp2{{=}}date[1-9]}}

===From a module===
To call from a module, use:
<syntaxhighlight lang="lua">
local checkForUnknownParameters = require("Module:Check for unknown parameters")
local result = checkForUnknownParameters._check(validArgs, args)
</syntaxhighlight>

Where the first set of args are the module args below and the second set of args are the parameters that are checked.

== Parameters ==
* <code>arg1</code>, <code>arg2</code>, ..., <code>argN</code>, are the known parameters.
* Unnamed (positional) parameters can be added too: <code>|1|2|arg1|arg2|...</code>.
* [[:mw:Extension:Scribunto/Lua reference manual#Patterns|Lua patterns]] (similar to [[regular expression]]s) usage with parameters is also supported (such as: {{para|regexp1|header[%d]+}}, {{para|regexp2|date[1-9]}}, {{para|regexp3|data[%d]+[abc]?}}). This is useful when there are many known parameters which use a systematic pattern.
* {{para|unknown}} – what happens when an uknown parameter is used. Typically use either a tracking category to place pages that use unknown parameters, or an error.
* {{para|preview}} – the text to be displayed when in preview mode and an unknown parameter is used.
* The <code>_VALUE_</code> keyword, if used, will be changed to the name of the parameter. This is useful for either sorting the entries in a tracking category, or for provide more explicit information.
* {{para|ignoreblank|1}} – by default, the module makes no distinction between a defined-but-blank parameter and a non-blank parameter. That is, both unlisted {{Para|foo|x}} and {{Para|foo}} are reported. To only track non-blank parameters use {{para|ignoreblank|1}}.
* {{para|showblankpositional|1}} – by default, the module ignores blank positional parameters. That is, an unlisted {{para|2}} is ignored. To {{em|include}} blank positional parameters in the tracking use {{para|showblankpositional|1}}.

== Example ==
<syntaxhighlight lang="wikitext">
{{Infobox
| above = {{{name|}}}

| label1 = Height
| data1 = {{{height|}}}

| label2 = Weight
| data2 = {{{weight|}}}

| label3 = Website
| data3 = {{{website|}}}
}}<!-- 
  end infobox, start tracking
-->{{#invoke:Check for unknown parameters|check
| unknown = {{Main other|[[Category:Some tracking category|_VALUE_]]}}
| preview = unknown parameter "_VALUE_" | height | name | website | weight 
}}
</syntaxhighlight>

==Call from within Lua code==
See the end of [[Module:Rugby box]] for a simple example or [[Module:Infobox3cols]] or [[Module:Flag]] for more complicated examples. 

==See also==
* {{Clc|Unknown parameters}} (category page can have header {{tl|Unknown parameters category}})
* [[Module:Params]] – for complex operations involving parameters
* [[Template:Checks for unknown parameters]] – adds documentation to templates using this module
* [[Module:Check for deprecated parameters]] – similar module that checks for deprecated parameters
* [[Module:Check for clobbered parameters]] – module that checks for conflicting parameters
* [[Module:TemplatePar]] – similar function (originally from dewiki)
* [[Template:Parameters]] and [[Module:Parameters]] – generates a list of parameter names for a given template
* [[Project:TemplateData]] based template parameter validation
* [[Module:Parameter validation]] checks a lot more
* [[User:Bamyers99/TemplateParametersTool]] - A tool for checking usage of template parameters

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[[Category:Module documentation pages]]
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