Installation

• Download and place the file(s) in a directory called ParserPower in your extensions/ folder.
• Add the following code at the bottom of your LocalSettings.php file:

  wfLoadExtension( 'ParserPower' );
  

• Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

Usage

ParserPower provides several parser functions, most notably {{#or:param1|param2|param3|...}}, which returns the first nonempty value passed. This can be used as a syntax sugar for {{#if:{{{1|}}}|{{{1}}}|default}}, and if {{{1|}}} is instead a value requiring an expensive computation that won't get cached (e.g. the result of a Cargo query), it provides a Variables-free approach to do the computation only once.

Other parser functions include:

• {{#follow:page title}}, returning a page's name or its redirect target (expensive the first time it's used on a particular page)
• {{#arraymap:value | delimiter | variable | formula | new_delimiter | conjunction}} as in Page Forms (will not load if Page Forms is also installed)
• {{#arraymaptemplate:value | template | delimiter | new_delimiter}} as in Page Forms (will not load if Page Forms is also installed)
• Several list-handling functions:
  • {{#lstcnt:list|separator}}
  • {{#lstsep:list|input separator|output separator}}
  • {{#lstelem:list|input separator|index}} (1-indexed)
  • {{#lstsub:list|input separator|output separator|start index|length}}
  • {{#lstfnd:item to find|list|separator|case sensitivity option}}
  • {{#lstind:item to find|list|separator|options}}
  • {{#lstapp:list|separator|new item}}
  • {{#lstprep:new item|separator|list}}
  • {{#lstjoin:first list|first input separator|second list|second input separator|output separator}}
  • {{#listfilter:}}
  • {{#lstfltr:items to keep|items separator|list|input separator|output separator|case sensitivity option}}
  • {{#lstrm:item to remove|list|input separator|output separator|case sensitivity option}}
  • {{#lstcntuniq:list|separator|case sensitivity option}}
  • {{#listunique:}}
  • {{#listsort:}}
  • {{#listmap:}}
  • {{#listmerge:}}