[swift-evolution] [Proposal] Refining Identifier and Operator Symbology

[Xiaodi Wu]

I disagree pretty strongly with this approach. Firstly because as you've
pointed out, changes to the operator characters will have effects on valid
operator character sets, secondly because a major question about operators
is whether it is feasible or no to manually exclude empty set and infinity
given that Unicode is likely to reject that approach. For these reasons I
feel very strongly that the reforming the operator and identifier
characters must move in tandem.
On Fri, Oct 21, 2016 at 14:28 Nevin Brackett-Rozinsky via swift-evolution <
swift-evolution at swift.org> wrote:

> I think it is important that we as a community discuss the non-operator
> portion of this proposal. And, given the strong opinions about operators
> that have been expressed, I think it is unlikely we will do so while major
> operator changes are on the table.
>
> Thus I would suggest that either the operator changes should be separated
> out into their own proposal, or we should make only minor (and generally
> consensus-agreed) changes to the operator set as part of this one.
>
> Here is what I propose:
>
> Emoji shall be identifiers, not operators.
> The turned ampersand shall be an operator, not an identifier.
> The empty set and infinity symbols shall be identifiers, not operators.
>
> All other potential changes to the set of operator characters then go in
> their own proposal, which I am sure will receive a lot of attention.
>
> It may turn out that the non-operator portion of this proposal nonetheless
> touches characters that Swift has designated for operators, in which case
> we may address those as they arise.
>
> Does that sound like a reasonable way forward?
>
> Nevin
>
>
>
> On Fri, Oct 21, 2016 at 9:27 AM, Ben Rimmington via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>
> > On 21 Oct 2016, at 13:42, Benjamin Spratling wrote:
> >
> > Brackets and symbols are definitely operators.  Different brackets are
> used to represent various quantum mechanical forms and operations.
>
> The brackets are mostly "bracket pieces":
>
>         [:Math_Symbol:]
>         - [:name=/\bANGLE\b/:]
>         - [:Emoji:]
>         - [:ID_Continue:]
>         - [:NFC_Quick_Check=No:]
>         & [:Script_Extensions=Common:]
>         & [:Block=Miscellaneous_Technical:]
>
> <
> http://www.unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AMath_Symbol%3A%5D%0D%0A-+%5B%3Aname%3D%2F%5CbANGLE%5Cb%2F%3A%5D%0D%0A-+%5B%3AEmoji%3A%5D%0D%0A-+%5B%3AID_Continue%3A%5D%0D%0A-+%5B%3ANFC_Quick_Check%3DNo%3A%5D%0D%0A%26+%5B%3AScript_Extensions%3DCommon%3A%5D%0D%0A%26+%5B%3ABlock%3DMiscellaneous_Technical%3A%5D
> >
>
> > Arrows are also useful as operators, including but not restricted to
> chemical reactions.
>
> Including arrows, there are 740 operators:
>
>         [:Math_Symbol:]
>         - [:name=/\bANGLE\b/:]
>         - [:name=EMPTY SET:]
>         - [:name=INFINITY:]
>         - [:Emoji:]
>         - [:ID_Continue:]
>         - [:NFC_Quick_Check=No:]
>         & [:Script_Extensions=Common:]
>         & [[:Block=Arrows:]
>            [:Block=General_Punctuation:]
>            [:Block=Latin_1_Supplement:]
>            [:Block=Mathematical_Operators:]
>            [:Block=Miscellaneous_Mathematical_Symbols_A:]
>            [:Block=Miscellaneous_Symbols_And_Arrows:]
>            [:Block=Supplemental_Arrows_A:]
>            [:Block=Supplemental_Arrows_B:]
>            [:Block=Supplemental_Mathematical_Operators:]]
>
> <
> http://www.unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AMath_Symbol%3A%5D%0D%0A-+%5B%3Aname%3D%2F%5CbANGLE%5Cb%2F%3A%5D%0D%0A-+%5B%3Aname%3DEMPTY+SET%3A%5D%0D%0A-+%5B%3Aname%3DINFINITY%3A%5D%0D%0A-+%5B%3AEmoji%3A%5D%0D%0A-+%5B%3AID_Continue%3A%5D%0D%0A-+%5B%3ANFC_Quick_Check%3DNo%3A%5D%0D%0A%26+%5B%3AScript_Extensions%3DCommon%3A%5D%0D%0A%26+%5B%5B%3ABlock%3DArrows%3A%5D%0D%0A+++%5B%3ABlock%3DGeneral_Punctuation%3A%5D%0D%0A+++%5B%3ABlock%3DLatin_1_Supplement%3A%5D%0D%0A+++%5B%3ABlock%3DMathematical_Operators%3A%5D%0D%0A+++%5B%3ABlock%3DMiscellaneous_Mathematical_Symbols_A%3A%5D%0D%0A+++%5B%3ABlock%3DMiscellaneous_Symbols_And_Arrows%3A%5D%0D%0A+++%5B%3ABlock%3DSupplemental_Arrows_A%3A%5D%0D%0A+++%5B%3ABlock%3DSupplemental_Arrows_B%3A%5D%0D%0A+++%5B%3ABlock%3DSupplemental_Mathematical_Operators%3A%5D%5D
> >
>
> -- Ben
>
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