* Tokens are now immutable. The progress of transformations is tracked on
chunks instead of tokens. Tokenizer output is cached and can be directly
returned without a need for cloning. Transforms are required to clone or
newly create tokens they are modifying.
* Expansions per chunk are now shared between equivalent frames via a cache
stored on the chunk itself. Equivalence of frames is not yet ideal though,
as right now a hash tree of *unexpanded* arguments is used. This should be
switched to a hash of the fully expanded local parameters instead.
* There is now a vastly improved maybeSyncReturn wrapper for async transforms
that either forwards processing to the iterative transformTokens if the
current transform is still ongoing, or manages a recursive transformation if
needed.
* Parameters for parser functions are now wrapped in abstract Params and
ParserValue objects, which support some handy on-demand *value* expansions.
Keys are always expanded. Parser functions are converted to use these
interfaces, and now properly expand their values in the correct frame.
Making this expansion lazier is certainly possible, but would complicate
transformTokens and other token-handling machinery. Need to investigate if
it would really be worth it. Dead branch elimination is certainly a bigger
win overall.
* Complex recursive asynchronous expansions should now be closer to correct
for both the iterative (transformTokens) and recursive (maybeSyncReturn
after transformTokens has returned) code paths.
* Performance degraded slightly. There are no micro-optimizations done yet
and the shared expansion cache still has a low hit rate. The progress
tracking on chunks is not yet perfect, so there are likely a lot of unneeded
re-expansions that can be easily eliminated. There is also more debug
tracing right now. Obama currently expands in 54 seconds on my laptop.
Change-Id: I4a603f3d3c70ca657ebda9fbb8570269f943d6b6
This is a bit better than cloning tokens wholesale, but not by much. There is
a lot of potential for much better per-token caching with reduced token
cloning. Need to map out all dependencies besides token attributes expanded
from template parameters or other scoped state. Even if tokens themselves
don't need transformation, they might still need to be considered for other
token transformers, so simply keeping the final rank won't quite work even if
the token itself is fully transformed. As a minimum, a shallow clone would
need to be made and the rank reset (as in env.cloneTokens).
Change-Id: I4329113bb21750bae9a635229ed1b08da75dc614
Instead of a proliferation of data-mw-* attributes, it should be easier to
stash all private / non-semantic round-trip information in a JSON object
stored in data-mw.
Change-Id: Id200a6a8789fa152f29ea530e5a24b6ee7b4b285
* Convert all attributes into strings in Sanitizer
* Use strict comparison against empty string in tokenizer
* Add very simple sitename parserfunction
* 138 tests passing
values. This includes comments, templates and template arguments.
This also replaces the specialized expansion logic in the TemplateHandler. The
removal of link validation lets one more parser test fail for now. External
link target validation will need to be implemented in the token stream handler
for links. This is noted as TODO in
https://www.mediawiki.org/wiki/Future/Parser_development#Token_stream_transforms.
other tokens. This is only the first half of the conversion. The next step is
to drop the type attribute on most tokens and match on the constructor in the
token transform machinery.
characters from host portions of links hrefs for now. This module needs to be
filled up with pretty much everything Sanitizer.php does, including tag and
attribute whitelists and attribute value sanitation (especially for style
attributes).
We'll also need to think about round-tripping of sanitized tokens.
