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2022-05-07T20:24:47Z

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{{Module rating |alpha}}

== Usage ==

This module provides a function which adds fallback functionalities to a given table ''args'' according to the fallback sequence given in ''arg_aliases''. Note that this module currently only supports indexing, i.e. <code>__index</code>.

=== Parameters ===

;args: The table to add fallback functionalities.
;arg_aliases: A table of the form <code>{ [key] = { fallback1, fallback2... } }</code>.

=== Example ===

The following snippet adds template parameter aliases to a metatable obtained from [[Module:Arguments]].

<syntaxhighlight lang=lua>
local getArgs = require('Module:Arguments').getArgs
local makeFallback = require('Module:Sandbox/Artoria2e5/Fallback')
local p = {}

function p.main(frame)
local args = makeFallback(getArgs(frame), {
["foo_bar"] = {"foobar", "foo", "bar"}
})
-- Try calling this template with |foo=42.
return (args["foo_bar"] or "nothing here!")
end

return p
</syntaxhighlight>

The following snippet shows basic usage of indexing fallback.

<syntaxhighlight lang=lua>
local makeFallback = require('Module:Arguments/Fallback')
table = {
["bar"] = "crunchy"
}

makeFallback(table, {
["foo_bar"] = {"foobar", "foo", "bar"}
})

return table["foo_bar"]
</syntaxhighlight>

The following snippet creates a fallback list with all fallback names aliasing back to the main name.

<syntaxhighlight lang=lua>
local makeFallback = require('Module:Sandbox/Artoria2e5/Fallback')
table = {
["bar"] = "crunchy"
}
makeFallback(table, {
["foo_bar"] = {"foobar", "foo", "bar"},
["foo"] = {"foo_bar"},
["foobar"] = {"foo_bar"},
["bar"] = {"foo_bar"}
})
return table["foo"]
</syntaxhighlight>

<includeonly>{{#ifeq:{{SUBPAGENAME}}|sandbox | |


}}</includeonly>

Module:Sandbox/Artoria2e5/Fallback/doc - Revision history

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