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Module:Ustring/doc

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This module directly imports all functions from the mw.ustring library. Documentation for each function can be found there.

The module takes an indefinite number of arguments. Arguments given as |s1=, |s2=, etc, are read first, and are used as strings. All remaining numerical arguments are coerced to number type if possible, and remain strings if not. If you wish for a numerical (i.e. unnamed or "|1=", "|2=") to remain a string, you can simply escape it by inserting \ at the beginning of the string.

Note that MediaWiki will always trim whitespace from named arguments; to give arguments with surrounding whitespace you must use unnamed parameters starting with \.

How to pass inconvenient strings
To pass this... Write this Explanation
" 0123 " |\ 123 To get surrounding whitespace must use unnamed, but must precede with \ to indicate that it isn't a number.
"0123" |s1=0123 If you don't need to preserve whitespace use |s1= etc.
"0123" |1=\0123 If you don't need to preserve whitespace explicitly use |1= etc.
In another template, to pass its parameter {{{1}}}, preserving whitespace |\{{{1}}} Must provide the \ with unknown string input.
In another template, to pass its parameter {{{1}}}, stripping whitespace |s1={{{1}}}
In another template, to pass its parameter {{{1}}}, stripping whitespace |1=\{{#if:1|{{{1}}}}}

You can also wrap results in tags. All other unused arguments will be passed to frame:extensionTag

Usage

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{{#invoke:Ustring|function_name|arg1|arg2|...}} is equivalent to mw.ustring.function_name( arg1, arg2, ... )

Example using mw.ustring.sub

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{{#invoke:Ustring|sub|s1=abcde|2|4}}

produces:

bcd

Example using mw.ustring.gsub

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{{#invoke:Ustring|gsub|s1=1234|23|}}

produces:

14

Example using mw.ustring.char

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&#{{#invoke:ustring|char|49|48|59}}

produces:




Example using mw.ustring.match

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{{#invoke:Ustring|match|s1=abcde|s2=(c%w)}}

produces:

cd

Note: Only the first match is returned. Additional returns are omitted because mw.ustring.gsub's second return value is generally undesirable.

Example using tag arguments

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{{#invoke:Ustring|match
|s1={{Module:Ustring}}|%s%s%sif%snot%s[^%s]+%sthen.+%
<!--enter an actual newline character to match '\n'-->%s%s%send
|tag=syntaxhighlight|lang=lua}}

produces:

			if not fargs.tag then
				return (what(unpack(args)))		-- Outside parens truncate to first result avoiding tail call
			end
			local tagargs = {}
			for x, y in pairs(fargs) do
				if not fargsused[x] then tagargs[x] = y end
			end

Note that:

<syntaxhighlight lang="lua">{{#invoke:Ustring|match
|s1={{Module:Ustring}}|%s%s%sif%snot%s[^%s]+%sthen.+%
<!--enter an actual newline character to match '\n'-->%s%s%send}}</syntaxhighlight>

produces:

{{#invoke:Ustring|match
|s1={{Module:Ustring}}|%s%s%sif%snot%s[^%s]+%sthen.+%
<!--enter an actual newline character to match '\n'-->%s%s%send}}

Errors

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Errors from accessing mw.ustring should be maintained, e.g.:

{{#invoke:Ustring|xyzzy}}

should produce:

Script error: The function "xyzzy" does not exist.

and

{{#invoke:Ustring|maxPatternLength}}

should produce:

Script error: "maxPatternLength" is not a function.

See also

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