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partially rewrite Caveats, external link caveat

"inherent limitation in wikicode" sounds misleading it's about generating an AST instead of HTML.
tags/v0.5
Larivact vor 7 Jahren
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@@ -115,21 +115,24 @@ Likewise, use ``unicode(code)`` in Python 2.

Caveats
-------
mwparserfromhell generates an abstract syntax tree instead of HTML.
This has several implications:

An inherent limitation in wikicode prevents us from generating complete parse
trees in certain cases. For example, the string ``{{echo|''Hello}}, world!''``
produces the valid output ``<i>Hello, world!</i>`` in MediaWiki, assuming
``{{echo}}`` is a template that returns its first parameter. But since
representing this in mwparserfromhell's node tree would be impossible, we
compromise by treating the first node (i.e., the template) as plain text,
parsing only the italics.
* Crossed constructs like ``{{echo|''Hello}}, world!''`` are not supported,
since they cannot be represented in the node tree. We compromise by treating
the first node (i.e. the template) as plain text, parsing only the italics.

The current workaround for cases where you are not interested in text
formatting is to pass ``skip_style_tags=True`` to ``mwparserfromhell.parse()``.
This treats ``''`` and ``'''`` like plain text.
The current workaround for cases where you are not interested in text
formatting is to pass ``skip_style_tags=True`` to ``mwparserfromhell.parse()``.
This treats ``''`` and ``'''`` like plain text.

A future version of mwparserfromhell will include multiple parsing modes to get
around this restriction.
A future version of mwparserfromhell will include multiple parsing modes to get
around this restriction.

* Templates adjacent to external links e.g. ``http://example.com{{foo}}`` are
considered part of the link, since mwparserfromhell does not know the
definition of templates and even if it did the template could only be
partially part of the link which also couldn't be represented in the AST.

Integration
-----------


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