[Lldb-commits] [PATCH] D66654: Prevent D66398 `TestDataFormatterStdList`-like regressions in the future

[Jan Kratochvil via Phabricator via lldb-commits]

jankratochvil added a comment.

In D66654#1645658 <https://reviews.llvm.org/D66654#1645658>, @clayborg wrote:

> What about having the first one that matched being the one that is used and avoid errors all together?


This is how it worked so far before the fix D66398 <https://reviews.llvm.org/D66398> (which made the regexes unambiguous - always matching at most 1 regex for any string).  The previous version of the patch <https://reviews.llvm.org/D66398?id=215895> just sorted the regexes alphabetically because original LLDB did not sort them at all printing random results.

@labath did not like the alphabetical sorting as (IIUC) adding formatters from a new library can affect formatting for a different library.

> We do this with the regex alias stuff already.

I haven't found the work `alias` in either `grep -ri alias $(find -name DataFormatters)` or in  Variable Formatting doc <https://lldb.llvm.org/use/variable.html>.

> With regular expressions people are sure to make ones that conflict with each other.

So which order to choose? It should not have different output during different runs of LLDB.


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