[swift-evolution] [Review] SE-0077 v2: Improved operator declarations

[John McCall]

> On Jul 7, 2016, at 9:23 AM, Dmitri Gribenko via swift-evolution <swift-evolution at swift.org> wrote:
> > Proposal link:
> >
> > https://github.com/apple/swift-evolution/blob/master/proposals/0077-operator-precedence.md <https://github.com/apple/swift-evolution/blob/master/proposals/0077-operator-precedence.md>
> 
> Dave, Max and I discussed SE-0077 and reviewed the names of precedence groups.
> Here's our recommendation.
> 
> In general, we think some names don't read well and have some ambiguities, for
> example, "LogicalAndPrecedence" (looks like a conjunction),
> "AdditivePrecedence" ("additive" is an adjective that modifies "precedence"),
> "RangePrecedence" ("range" is not an adjective, stands out).
> 
> We think that two directions would be fruitful:
> 
> 1.  If the names of precedence groups will be in the same namespace as types,
>     then we recommend pushing the names of precedence groups into a "namespace",
>     for example "Precedence.Assignment".

We don't have any language features that would allow this.

John.

> 
> 2.  If (1) is not workable, we suggest incrementally improving existing names
>     to make them more readable and less ambiguous.  We think that making the
>     names less technical by naming the groups after a representative operation
>     will be easier for users to understand (instead of "AdditivePrecence" we
>     are proposing "AdditionPrecedence").  We also think that using an adjective
>     before "Precedence" does not read well in many cases
>     ("NilCoalescingPrecedence": precedence that coalesces nils).
> 
> 
> Current name            | Namespacing                 | Incremental improvement
> ------------------------|-----------------------------|-----------------------------
> AssignmentPrecedence    | Precedence.Assignment       | no change
> TernaryPrecedence       | Precedence.Ternary          | no change
> DefaultPrecedence       | Precedence.Default          | no change
> LogicalOrPrecedence     | Precedence.LogicalOr        | DisjunctionPrecedence
> LogicalAndPrecedence    | Precedence.LogicalAnd       | ConjunctionPrecedence
> ComparativePrecedence   | Precedence.Comparison       | ComparisonPrecedence
> NilCoalescingPrecedence | Precedence.NilCoalescing    | no change
> CastPrecedence          | Precedence.Casting          | no change
> RangePrecedence         | Precedence.RangeForming     | RangeFormationPrecedence
> AdditivePrecedence      | Precedence.Addition         | AdditionPrecedence
> MultiplicativePrecedence| Precedence.Multiplication   | MultiplicationPrecedence
> BitwiseShiftPrecedence  | Precedence.BitwiseShift     | BitwiseShiftPrecedence
> 
> Dmitri
> 
> -- 
> main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
> (j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com <mailto:gribozavr at gmail.com>>*/
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