Module parser/rules/block/tabview

Block rule for Wikidot tabbed content: [[tabview]] (or [[tabs]]).

A tabview contains one or more [[tab Label]]...[[/tab]] blocks:

[[tabview]]
[[tab First Tab]]
Content of the first tab.
[[/tab]]
[[tab Second Tab]]
Content of the second tab.
[[/tab]]
[[/tabview]]

Key behaviours:

Both [[tabview]] and [[tabs]] are accepted as the outer wrapper.
Any attributes or text after the block name on the opening tag are silently ignored (Wikidot behaviour: [[tabview Foo]] is valid).
If a tab has no label, it defaults to "untitled".
Tab body content is parsed as block-level markup.
An empty tabview (no tabs) fails the rule, falling back to text.
Non-tab content between tabs (other than whitespace/newlines) causes the rule to fail.

Variables