W3TPL/tags: Difference between revisions
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* '''Text block inclusion''': | * '''Text block inclusion''': | ||
** '''{{l/w3tpl/tag|hide}}''': Runs the parser on everything in between the tags, but doesn't display the result. Useful for doing a lot of "programmish" stuff, so you can format it nicely and comment it without messing up your display | ** '''{{l/w3tpl/tag|hide}}''': Runs the parser on everything in between the tags, but doesn't display the result. Useful for doing a lot of "programmish" stuff, so you can format it nicely and comment it without messing up your display | ||
** '''{{l/w3tpl/tag|echo}}''': overrides the "hide" attribute (and eventually the {{ | ** '''{{l/w3tpl/tag|echo}}''': overrides the "hide" attribute (and eventually the {{xml/tag|hide}} tag), i.e. displays contents | ||
** '''{{l/w3tpl/tag|load}}''': includes the contents of another page – like templates, but without creating a separate instance of the page object | ** '''{{l/w3tpl/tag|load}}''': includes the contents of another page – like templates, but without creating a separate instance of the page object | ||
* '''{{l/w3tpl/tag|let}}, {{w3tpl/tag|get}}''': much like PageVars extension, but using XML tags instead of <nowiki>{{#parser}}</nowiki> functions | * '''{{l/w3tpl/tag|let}}, {{l/w3tpl/tag|get}}''': much like PageVars extension, but using XML tags instead of <nowiki>{{#parser}}</nowiki> functions | ||
* '''{{l/w3tpl/tag|func}}''': defines a function which can be called with arguments later | * '''{{l/w3tpl/tag|func}}''': defines a function which can be called with arguments later | ||
** '''{{l/w3tpl/tag|arg}}''': optional method of passing arguments to a function | ** '''{{l/w3tpl/tag|arg}}''': optional method of passing arguments to a function | ||
** '''{{l/w3tpl/tag|call}}''': call a previously defined function | ** '''{{l/w3tpl/tag|call}}''': call a previously defined function | ||
* '''Control structures''': | * '''Control structures''': | ||
** '''{{l/w3tpl/tag|if}}, {{w3tpl/tag|else}}''' | ** '''{{l/w3tpl/tag|if}}, {{l/w3tpl/tag|else}}''' | ||
** '''{{l/w3tpl/tag|for}}''' | ** '''{{l/w3tpl/tag|for}}''' | ||
** '''{{l/w3tpl/tag|xploop}}''': Same as <nowiki>{{#xploop}}</nowiki>, but uses varname instead of $s$ | ** '''{{l/w3tpl/tag|xploop}}''': Same as <nowiki>{{#xploop}}</nowiki>, but uses varname instead of $s$ | ||
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** '''Used in''': {{l/w3tpl/tag|if}}/{{l/w3tpl/tag|else}}, {{l/w3tpl/tag|for}} | ** '''Used in''': {{l/w3tpl/tag|if}}/{{l/w3tpl/tag|else}}, {{l/w3tpl/tag|for}} | ||
* '''parse''': parse any wikitext when reading the value of a variable | * '''parse''': parse any wikitext when reading the value of a variable | ||
==Technical Notes== | |||
The content-processing flow for tags goes like this: | |||
* For each tag class-file found: | |||
* &rarr: $mwoParser->setHook( {{arg|tag name}},{{arg|tag class}}::Call() ) | |||
* ''documentation in progress'' | |||
W3TPL gets initialized like this: | |||
* {{l/mw|Manual:Hooks/ParserFirstCallInit}} (MediaWiki hook) | |||
* → <code>w3tpl\cEntryPoint::cbInit</code> |
Revision as of 21:13, 23 April 2022
About
W3TPL implements a set of XML-style tags for embedding within wikitext, and uses the MediaWiki parser (via a standard hook) to notice them and call the appropriate W#TPL code for processing.
The MW parser does not always do things in the expected order, so most of these tags have ways of using internal data for their values rather than depending on the literal sequencing of the tags.
Another issue with the MediaWiki parser is that it cannot deal with nested tags properly; the ending-tag of a tag-pair nested inside another tag-pair results in closure of the outer tag-pair as well, and any text past the internal closing-tag is displayed rather than being passed to the tag handler. W3TPL allows you to get around this limitation by defining functions which are parsed separately from the code-block in which they are executing.
My plan has been to create a <w3tpl> content-tag which supports directly-parsed scripting, based on the names and attributes of the existing W3 tags.
Tags
alphabetical | by function |
---|---|
|
Common Attributes
- name=: name of variable being accessed (usage depends on tag)
- hide: if present, the contents of the tag will not be displayed except for those enclosed by <echo> tags. If absent, the contents of the <echo><echo> tags are ignored and only the remainder of the content is shown. (At present, contents of the <hide> tag itself are never displayed; this will be changed to enable the <echo> tag at some point.)
- parse: parse any wikitext when reading the value of a variable
Technical Notes
The content-processing flow for tags goes like this:
- For each tag class-file found:
- &rarr: $mwoParser->setHook( <tag name>,<tag class>::Call() )
- documentation in progress
W3TPL gets initialized like this:
- Manual:Hooks/ParserFirstCallInit (MediaWiki hook)
- →
w3tpl\cEntryPoint::cbInit