Hi Henry,
> On Aug 22, 2016, at 7:00 AM, Henry Betts via swift-corelibs-dev
> <swift-corelibs-dev@swift.org> wrote:
>
> Hi,
>
> I am new to the mailing list, and am interested in contributing to the swift
> project.
Welcome!
>
> I’ve been having a play with the ICU library’s unit formatting functions, and
> have created a simple wrapper that could be used by the various measurement
> formatters as well as the date component formatter. At the moment, this
> wrapper is written in swift, but I’m thinking it might make more sense to
> implement it as a core foundation layer, so as not to expose ICU directly to
> swift.
>
> The interface for this could look something like:
>
> enum CFUnitFormatterStyle{
>
> CFUnitFormatterStyleLong,
> CFUnitFormatterStyleMedium,
> ...
>
> };
>
> enum CFUnitFormatterUnit{
>
> CFUnitFormatterUnit_Length_Meter,
> ...
> CFUnitFormatterUnit_Mass_Gram,
> ...
>
> };
>
> struct CFUnitFormatterMeasure{
>
> double value;
> CFUnitFormatterUnit unit;
>
> };
>
> CFUnitFormatterRef CFUnitFormatterCreate(CFAllocatorRef allocator,
> CFLocaleRef locale, CFUnitFormatterStyle style, CFNumberFormatterRef
> numberFormatter);
>
> CFStringRef CFUnitFormatterCreateString(CFAllocatorRef allocator,
> CFUnitFormatterRef formatter, double value, CFUnitFormatterUnit unit);
>
> CFStringRef CFUnitFormatterCreateStringWithMeasure(CFAllocatorRef allocator,
> CFUnitFormatterRef formatter, CFUnitFormatterMeasure measure);
>
> CFStringRef CFUnitFormatterCreateStringWithMeasures(CFAllocatorRef allocator,
> CFUnitFormatterRef formatter, CFArrayRef measures);
>
>
> Looking for any thoughts and suggestions before I begin implementing this.
>
> Henry
>
This approach makes sense - we have been putting stub functions into CF to use
ICU, because ICU’s headers are not module-friendly (yet?). Our Darwin
implementation also maps to the ICU constants for units (that I’m sure you
found).
I would love to be able to use ICU from Swift instead of implementing
everything twice, but maybe that’s a tall order.
- Tony
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