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{{Used in system}}
This module provides easy processing of arguments passed from #invoke. It is a meta-module, meant for use by other modules, and should not be called from #invoke directly. Its features include:
* Easy trimming of arguments and removal of blank arguments.
* Arguments can be passed by both the current frame and by the parent frame at the same time. (More details below.)
* Arguments can be passed in directly from another Lua module or from the debug console.
* Most features can be customized.
First, you need to load the module. It contains one function, named <code>getArgs</code>.
<
local getArgs = require('Module:Arguments').getArgs
</syntaxhighlight>
In the most basic scenario, you can use getArgs inside your main function. The variable <code>args</code> is a table containing the arguments from #invoke. (See below for details.)
<
local getArgs = require('Module:Arguments').getArgs
local p = {}
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return p
</syntaxhighlight>
However, the recommended practice is to use a function just for processing arguments from #invoke. This means that if someone calls your module from another Lua module you don't have to have a frame object available, which improves performance.
<
local getArgs = require('Module:Arguments').getArgs
local p = {}
Line 45:
return p
</syntaxhighlight>
If you want multiple functions to use the arguments, and you also want them to be accessible from #invoke, you can use a wrapper function.
<
local getArgs = require('Module:Arguments').getArgs
local p = {}
local function makeInvokeFunc(funcName)
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end
end
p.func1 = makeInvokeFunc('_func1')
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return p
</syntaxhighlight>
=== Options ===
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The following options are available. They are explained in the sections below.
<
local args = getArgs(frame, {
trim = false,
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parentOnly = true,
parentFirst = true,
wrappers = {
'Template:A wrapper template',
'Template:Another wrapper template'
},
readOnly = true,
noOverwrite = true
})
</syntaxhighlight>
=== Trimming and removing blanks ===
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However, sometimes you want to use blank arguments as input, and sometimes you want to keep additional whitespace. This can be necessary to convert some templates exactly as they were written. If you want to do this, you can set the <code>trim</code> and <code>removeBlanks</code> arguments to <code>false</code>.
<
local args = getArgs(frame, {
trim = false,
removeBlanks = false
})
</syntaxhighlight>
=== Custom formatting of arguments ===
Sometimes you want to remove some blank arguments but not others, or perhaps you might want to put all of the positional arguments in lower case. To do things like this you can use the <code>valueFunc</code> option. The input to this option must be a function that takes two parameters, <code>key</code> and <code>value</code>, and returns
Example 1: this function preserves whitespace for the first positional argument, but trims all other arguments and removes all other blank arguments.
<
local args = getArgs(frame, {
valueFunc = function (key, value)
if key == 1 then
return value
elseif value then
value = mw.text.trim(value)
if value ~= '' then
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end
end
return nil
end
})
</syntaxhighlight>
Example 2: this function removes blank arguments and converts all arguments to lower case, but doesn't trim whitespace from positional parameters.
<
local args = getArgs(frame, {
valueFunc = function (key, value)
if not value then
return nil
end
value = mw.ustring.lower(value)
if mw.ustring.find(value, '%S') then
return value
end
return nil
end
})
</syntaxhighlight>
Note: the above functions will fail if passed input that is not of type <code>string</code> or <code>nil</code>. This might be the case if you use the <code>getArgs</code> function in the main function of your module, and that function is called by another Lua module. In this case, you will need to check the type of your input. This is not a problem if you are using a function specially for arguments from #invoke (i.e. you have <code>p.main</code> and <code>p._main</code> functions, or something similar).
{{cot|Examples 1 and 2 with type checking}}
Example 1:
<
local args = getArgs(frame, {
valueFunc = function (key, value)
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if value ~= '' then
return value
else
return nil
end
else
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end
})
</syntaxhighlight>
Example 2:
<
local args = getArgs(frame, {
valueFunc = function (key, value)
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if mw.ustring.find(value, '%S') then
return value
else
return nil
end
else
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end
})
</syntaxhighlight>
|}
Also, please note that the <code>valueFunc</code> function is called more or less every time an argument is requested from the <code>args</code> table, so if you care about performance you should make sure you aren't doing anything inefficient with your code.
=== Frames and parent frames ===
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{{cot|Module:ExampleArgs code}}
<
local getArgs = require('Module:Arguments').getArgs
local p = {}
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return p
</syntaxhighlight>
|}
<code>Module:ExampleArgs</code> is then called by <code>Template:ExampleArgs</code>, which contains the code <code><nowiki>{{#invoke:ExampleArgs|main|firstInvokeArg}}</nowiki></code>. This produces the result "firstInvokeArg".
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Now if we were to call <code>Template:ExampleArgs</code>, the following would happen:
{| class="wikitable" style="width: 50em; max-width: 100%;"
|-
! style="width: 60%;" | Code
! style="width: 40%;" | Result
|-
| <code><nowiki>{{ExampleArgs}}</nowiki></code>
| firstInvokeArg
|-
| <code><nowiki>{{ExampleArgs|firstTemplateArg}}</nowiki></code>
| firstInvokeArg
|-
| <code><nowiki>{{ExampleArgs|firstTemplateArg|secondTemplateArg}}</nowiki></code>
| firstInvokeArg secondTemplateArg
|}
There are three options you can set to change this behaviour: <code>frameOnly</code>, <code>parentOnly</code> and <code>parentFirst</code>. If you set <code>frameOnly</code> then only arguments passed from the current frame will be accepted; if you set <code>parentOnly</code> then
{| class="wikitable" style="width: 50em; max-width: 100%;"
|-
! style="width: 60%;" | Code
! style="width: 40%;" | Result
|-
| firstInvokeArg
|-
| firstInvokeArg
|-
| <code><nowiki>{{ExampleArgs|firstTemplateArg|secondTemplateArg}}</nowiki></code>
| firstInvokeArg
|}
; parentOnly
{| class="wikitable" style="width: 50em; max-width: 100%;"
|-
! style="width: 60%;" | Code
! style="width: 40%;" | Result
|-
| <code><nowiki>{{ExampleArgs}}</nowiki></code>
|
|-
| <code><nowiki>{{ExampleArgs|firstTemplateArg}}</nowiki></code>
| firstTemplateArg
|-
| <code><nowiki>{{ExampleArgs|firstTemplateArg|secondTemplateArg}}</nowiki></code>
| firstTemplateArg secondTemplateArg
|}
; parentFirst
{| class="wikitable" style="width: 50em; max-width: 100%;"
|-
! style="width: 60%;" | Code
! style="width: 40%;" | Result
|-
| <code><nowiki>{{ExampleArgs}}</nowiki></code>
| firstInvokeArg
|-
| <code><nowiki>{{ExampleArgs|firstTemplateArg}}</nowiki></code>
| firstTemplateArg
|-
| <code><nowiki>{{ExampleArgs|firstTemplateArg|secondTemplateArg}}</nowiki></code>
| firstTemplateArg secondTemplateArg
|}
Notes:
# If you set both the <code>frameOnly</code> and <code>parentOnly</code> options, the module won't fetch any arguments at all from #invoke. This is probably not what you want.
# In some situations a parent frame may not be available, e.g. if getArgs is passed the parent frame rather than the current frame. In this case, only the frame arguments will be used (unless parentOnly is set, in which case no arguments will be used) and the <code>parentFirst</code> and <code>frameOnly</code> options will have no effect.
=== Wrappers ===
The ''wrappers'' option is used to specify a limited number of templates as ''wrapper templates'', that is, templates whose only purpose is to call a module. If the module detects that it is being called from a wrapper template, it will only check for arguments in the parent frame; otherwise it will only check for arguments in the frame passed to getArgs. This allows modules to be called by either #invoke or through a wrapper template without the loss of performance associated with having to check both the frame and the parent frame for each argument lookup.
For example, the only content of [[Template:Side box]] (excluding content in {{tag|noinclude}} tags) is <code><nowiki>{{#invoke:Side box|main}}</nowiki></code>. There is no point in checking the arguments passed directly to the #invoke statement for this template, as no arguments will ever be specified there. We can avoid checking arguments passed to #invoke by using the ''parentOnly'' option, but if we do this then #invoke will not work from other pages either. If this were the case, the {{para|text|Some text}} in the code <code><nowiki>{{#invoke:Side box|main|text=Some text}}</nowiki></code> would be ignored completely, no matter what page it was used from. By using the <code>wrappers</code> option to specify 'Template:Side box' as a wrapper, we can make <code><nowiki>{{#invoke:Side box|main|text=Some text}}</nowiki></code> work from most pages, while still not requiring that the module check for arguments on the [[Template:Side box]] page itself.
Wrappers can be specified either as a string, or as an array of strings.
<syntaxhighlight lang="lua">
local args = getArgs(frame, {
wrappers = 'Template:Wrapper template'
})
</syntaxhighlight>
<syntaxhighlight lang="lua">
local args = getArgs(frame, {
wrappers = {
'Template:Wrapper 1',
'Template:Wrapper 2',
-- Any number of wrapper templates can be added here.
}
})
</syntaxhighlight>
Notes:
# The module will automatically detect if it is being called from a wrapper template's /sandbox subpage, so there is no need to specify sandbox pages explicitly.
# The ''wrappers'' option effectively changes the default of the ''frameOnly'' and ''parentOnly'' options. If, for example, ''parentOnly'' were explicitly set to false with ''wrappers'' set, calls via wrapper templates would result in both frame and parent arguments being loaded, though calls not via wrapper templates would result in only frame arguments being loaded.
# If the ''wrappers'' option is set and no parent frame is available, the module will always get the arguments from the frame passed to <code>getArgs</code>.
=== Writing to the args table ===
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Sometimes it can be useful to write new values to the args table. This is possible with the default settings of this module. (However, bear in mind that it is usually better coding style to create a new table with your new values and copy arguments from the args table as needed.)
<
args.foo = 'some value'
</syntaxhighlight>
It is possible to alter this behaviour with the <code>readOnly</code> and <code>noOverwrite</code> options. If <code>readOnly</code> is set then it is not possible to write any values to the args table at all. If <code>noOverwrite</code> is set, then it is possible to add new values to the table, but it is not possible to add a value if it would overwrite any arguments that are passed from #invoke.
=== Ref tags ===
This module uses [[mw:Extension:Scribunto/Lua reference manual#Metatables|metatables]] to fetch arguments from #invoke. This allows access to both the frame arguments and the parent frame arguments without using the <code>pairs()</code> function. This can help if your module might be passed {{tag|ref}} tags as input.
As soon as {{tag|ref}} tags are accessed from Lua, they are processed by the MediaWiki software and the reference will appear in the reference list at the bottom of the article. If your module proceeds to omit the reference tag from the output, you will end up with a phantom reference
This module solves this problem by allowing access to both frame and parent frame arguments, while still only fetching those arguments when it is necessary. The problem will still occur if you use <code>pairs(args)</code> elsewhere in your module, however.
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=== Known limitations ===
The use of metatables also has its downsides. Most of the normal Lua table tools won't work properly on the args table, including the <code>#</code> operator, the <code>next()</code> function, and the functions in the table library. If using these is important for your module, you should use your own argument processing function instead of this module.<includeonly>{{#ifeq:{{SUBPAGENAME}}|sandbox||
[[Category:Lua metamodules]]
}}</includeonly>
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