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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (THRIFT-4496) Dealing with language keywords in Thrift (e.g. service method names)
Date Sat, 30 Jun 2018 11:53:00 GMT


ASF GitHub Bot commented on THRIFT-4496:

Jens-G commented on issue #1567: THRIFT-4496: python specific list of keywords for python
   I finally had the time to have a closer look at it.
   1. general approach is not bad. I still would strive to reduce that global list to the
minimum, but maybe we have to do that in a second step.
   2. what I find less helpful is the fact that the names are causing a failure(). In certain
cases, reserved names can still be used but require a bit of treamtment. For example, in C#
it is done by prefixing such a name with `@` to make *any* identifier a valid one, such as
`@return` instead of `return`. The generator can do this alone and therefore there is no need
to throw at all. In other languages we often added an underscore at the end of the name, which
requireds a bit of tracking but otherwise works quite well. 
   4. Last not least, the reserved identifiers may also be context dependent. There are keywords,
there are reserved words and there are special built-in method and property names used by
the runtime that should not be used either, even if the are not a keyword in the strict sense.
Context dependent now means, that expecially the latter ones differ between regular structs/classes
and exceptions, to name just one possible case.

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> Dealing with language keywords in Thrift (e.g. service method names)
> --------------------------------------------------------------------
>                 Key: THRIFT-4496
>                 URL:
>             Project: Thrift
>          Issue Type: New Feature
>          Components: Compiler (General)
>            Reporter: Vera Filippova
>            Priority: Minor
> Apache Thrift compiler doesn't allow to use keywords in any of supported languages as
field names. However, there are other compilers, like Scrooge, which do allow using some keywords
as field identifiers, which leads to incompatibility.
> Assume we had a service with 'delete' method, with Java code generated by Scrooge. Now
we'd like to generate Python code with Apache Thrift, but encounter an error because of the
'delete' keyword.
> I understand that using only Apache Thrift compiler, a user will never encounter this
problem, but I think enabling keywords by request seems feasible.
> h1. Proposal
> It's possible to tweak keywords on code generation stage, e.g. use 'delete_' as a name
of a generated function instead of 'delete', then use the original method name for a protocol
message: writeMethodBegin('delete').
> This feature could be enabled with an additional flag, e.g. --screen-keywords.
> I have a draft for python generator here []
> The questions are, is this functionality welcome? If yes, would it require to have it
supported for all languages?

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