Xi Ge 4d946f4918 [SyntaxModel] Improve the performance of searching URLs in comments (#5214) ...

[SyntaxModel] When searching URLs in doc comments, reduce the number of protocol name comparisons by looking ahead more characters, NFC. rdar://28298506

Searching URL in doc comments can be expensive. We used to look for
every colon as an indicator of potential URLs. However, this is not
efficient enough. Suggested by Ben, we further divide protocols into
categories so that most protocols can use "://" as an indicator of its
existence.

Not sure whether this is enough to close the radar, but I believe it is
a valuable performance improvement anyway.

2016-10-10 14:42:40 -07:00

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