In JS, strings are internally encoded as UTF-16, and properties like
.length return values in UTF-16 code units.
In PHP, strings are internally encoded as UTF-8, and we have the
option of using methods that return bytes like strlen() or UTF-8 code
units like mb_strlen().
However, the values produced by preg_match( …, PREG_OFFSET_CAPTURE )
are in bytes, and there's nothing we can do about that. So let's use
bytes throughout, mixing the two types results in meaningless numbers.
Then in the test code, we have to calculate UTF-16 code units offsets
based on the UTF-8 byte offsets.
We also have to copy the entire workaround for mw:Entity nodes… Maybe
the parser should be fixed to return the real nodes for ranges' ends
in this case.
Change-Id: I05804489d7de0d60be6e9f84e6a49a885e9fb870
It appears PHP's DOM library always uses CDATA nodes for the contents of
<style> tags, even if there is no such markup in the source HTML.
Change-Id: Id04b27086c5e7a0b016a3a440b2b4895d6b13c93
Profiling reveals that >87% of the run time of our test suite is spent
in this tiny method. Apparently, DOMNodeList::item() is extremely slow
(possibly it's linear time instead of constant time?).
Profiled using XDebug and KCacheGrind:
https://phabricator.wikimedia.org/F31815264
We can calculate the child's index in its parent by counting its
precending siblings instead, which turns out to be much faster.
Before:
1. 275444ms to run DiscussionToolsCommentParserTest:testGetComments with data set #2
2. 12668ms to run DiscussionToolsCommentParserTest:testGetComments with data set #3
...
After:
1. 9545ms to run DiscussionToolsCommentParserTest:testGetComments with data set #2
2. 5549ms to run DiscussionToolsCommentParserTest:testGetComments with data set #3
...
That's still kind of slow but now it's bearable to run the test suite.
Change-Id: I49155f7aa2e231a9a20bf282cf6aaa28fc902e0b
* Not to be confused with the Parsing Team's
"Great Parser JS to PHP port of 2019"
Gasp as OR hacks are changed to null coalescing operators.
Applaud as variable declarations are dropped.
Cheer as parameters and return values are type-hinted.
Shudder as DomNodeLists have no indexOf method.
Moving discussion parsing to the server should allow
us to implement much cleaner APIs for commenting.
Bug: T252252
Co-authored-by: Ed Sanders <esanders@wikimedia.org>
Change-Id: Ic1438d516e223db462cb227f6668e856672f538c
