Module:Ustring/doc: Difference between revisions

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{{used in system}}

{{cascade-protected template|page=module}}

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

The module takes an indefinite number of arguments. Arguments given as {{para|s1}}, {{para|s2}}, etc, are read first, and are used as strings. All remaining numerical arguments are coerced asto number type if possible, and remain strings if not. If you wish for somethinga numerical (i.e. unnamed or "{{para|1}}", "{{para|2}}") to remain a string, you can simply escape it by insertinserting <code>\</code> 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 <code>\</code>.

You can also wrap results in tags. All non-number indexed arguments will be passed to {{luaref|frame:extensionTag}}

{| class="wikitable"

|+ How to pass inconvenient strings

|-

! To pass this... !! Write this !! Explanation

|-

| <code>" 0123 "</code> || {{para||\ 123 }} || To get surrounding whitespace must use unnamed, but must precede with <code>\</code> to indicate that it isn't a number.

|-

| <code>"0123"</code> || {{para|s1|0123}} || If you don't need to preserve whitespace use {{para|s1}} etc.

|-

| <code>"0123"</code> || {{para|1|\0123}} || If you don't need to preserve whitespace explicitly use {{para|1}} etc.

|-

| In another template, to pass its parameter <code>{{{1}}}</code>, preserving whitespace || {{para||\{{{1}}}}} || Must provide the <code>\</code> with unknown string input.

|-

| In another template, to pass its parameter <code>{{{1}}}</code>, stripping whitespace || {{para|s1|{{{1}}}}} ||

|-

| In another template, to pass its parameter <code>{{{1}}}</code>, stripping whitespace || {{para|1|<nowiki>\{{#if:1|{{{1}}}}}</nowiki>}} ||

|}

You can also wrap results in tags. All non-numberother indexedunused arguments will be passed to {{luaref|frame:extensionTag}}

== Usage ==

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===Example using mw.ustring.sub===

<code><nowiki>{{#invoke:Ustring|sub|s1=abcde|2|4}}</nowiki></code>

produces:

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

===Example using mw.ustring.gsub===

<code><nowiki>{{#invoke:Ustring|gsub|s1=1234|23|}}</nowiki></code>

produces:

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

===Example using mw.ustring.char===

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

This is nice for escaping character sequences in other modules; for example:

<syntaxhighlight lang="lua">

p = {}

function p.main(frame)

local str = '1-2-2{{#invoke:ustring|char|45}}1-3'

return frame:preprocess(str:gsub('-', '/'))-- == '1/2/2-1/3'

end

return p

</syntaxhighlight>

===Example using mw.ustring.match===

<code><nowiki>{{#invoke:Ustring|match|s1=abcde|s2=(c%w)}}</nowiki></code>

produces:

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

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

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===Example using tag arguments===

<pre>{{#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}}</pre>

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

|tag=syntaxhighlight|lang=lua}}

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Note that:

{{#tag:pre|<nowiki><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></nowiki>}}

produces:

<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>

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<code><nowiki>{{#invoke:Ustring|xyzzy}}</nowiki></code>

should produce:

produces:

{{script error|Script error: The function "xyzzy" does not exist.}}

{{#invoke:Ustring|xyzzy}}

and

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<code><nowiki>{{#invoke:Ustring|maxPatternLength}}</nowiki></code>

should produce:

produces:

{{#invoke:Ustring|maxPatternLength}}

{{script error|Script error: "maxPatternLength" is not a function.}}

== See also ==

{{String handling templates}}

* [[Module:String]]

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

<!-- Categories below this line, please; interwikis at Wikidata -->

[[Category:Modules that manipulate strings|*]]

[[Category:Template metamodules|*]]

}}</includeonly>