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Ikiwiki's preprocessor parser cannot deal with arbitrary nested preprocesor
directives. It's possible to nest a directive with single quoted values
inside a triple-quoted value of a directive, but that's all.
It's not possible to unambiguously parse nested quotes, so to support
nesting, a new syntax would be needed. Maybe something xml-like?
> You can, however, unambiguously parse nested square brackets, and I think
> that would solve the problem, as long as you never allow the contents of a
> directive to contain a *partial* directive, which seems reasonable to me.
>
> For example, I *think* you can unambiguously parse the following:
>
> \[[!if test="enabled(template) and templates/foo" then="""
> [[!template id=foo content="""Flying Purple People Eater"""]]
> """]]
>
> --[[JoshTriplett]]
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