[dart-misc] Kernel lang

[kc]

In kernel lang there seem to be separate constructs for while/for/do.

How about just one loop construct with pre and post blocks. Annotations on
the loop node would indicate which type of loop it was.
More abstract but would make it easier to introduce new syntax or even
experiment with DSL's.

Same goes for conditionals.

K.

['Florian Loitsch' via Dart Misc]

[+kmillikin, asgerf]


On Tue, Feb 21, 2017 at 5:05 PM kc <***@gmail.com> wrote:

In kernel lang there seem to be separate constructs for while/for/do.

How about just one loop construct with pre and post blocks. Annotations on
the loop node would indicate which type of loop it was.
More abstract but would make it easier to introduce new syntax or even
experiment with DSL's.

Same goes for conditionals.

K.
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['Lasse R.H. Nielsen' via Dart Misc]

(I have no idea why the current design was made, the following is purely
speculation).

One argument against unifying the loops is that it might make compilation
to JavaScript harder. If you can unify the loops in such a way that you
don't lose information, then it should be possible (at least in some cases)
to compile a do-while loop in Dart to a do-while loop in JavaScript.
If you throw away the information that the original was a do-while loop,
then you basically have to re-discover that information again later to do
an optimal compilation.


/L


On Tue, Feb 21, 2017 at 6:31 PM, 'Florian Loitsch' via Dart Misc <

Post by 'Florian Loitsch' via Dart Misc
[+kmillikin, asgerf]
In kernel lang there seem to be separate constructs for while/for/do.
How about just one loop construct with pre and post blocks. Annotations on
the loop node would indicate which type of loop it was.
More abstract but would make it easier to introduce new syntax or even
experiment with DSL's.
Same goes for conditionals.
K.
--
For other discussions, see https://groups.google.com/a/dartlang.org/
For HOWTO questions, visit http://stackoverflow.com/tags/dart
To file a bug report or feature request, go to http://www.dartbug.com/new
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Lasse R.H. Nielsen - ***@google.com
'Faith without judgement merely degrades the spirit divine'
Google Denmark ApS - Frederiksborggade 20B, 1 sal - 1360 KÞbenhavn K
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['Kevin Millikin' via Dart Misc]

Kernel is a high-level core language for a Dart runtime, so it has Dart
semantics. We kept for and while loops separate partly because for has
different rules for variable capture than while.

We don't intend to require a Kernel (Dart) runtime to support behavior that
isn't required for implementing Dart. You already have quite a lot of
flexibility in the IR if you confine yourself to while (true) and break.

Post by 'Lasse R.H. Nielsen' via Dart Misc
(I have no idea why the current design was made, the following is purely
speculation).
One argument against unifying the loops is that it might make compilation
to JavaScript harder. If you can unify the loops in such a way that you
don't lose information, then it should be possible (at least in some cases)
to compile a do-while loop in Dart to a do-while loop in JavaScript.
If you throw away the information that the original was a do-while loop,
then you basically have to re-discover that information again later to do
an optimal compilation.
/L
On Tue, Feb 21, 2017 at 6:31 PM, 'Florian Loitsch' via Dart Misc <
[+kmillikin, asgerf]
In kernel lang there seem to be separate constructs for while/for/do.
How about just one loop construct with pre and post blocks. Annotations on
the loop node would indicate which type of loop it was.
More abstract but would make it easier to introduce new syntax or even
experiment with DSL's.
Same goes for conditionals.
K.
--
For other discussions, see https://groups.google.com/a/dartlang.org/
For HOWTO questions, visit http://stackoverflow.com/tags/dart
To file a bug report or feature request, go to http://www.dartbug.com/new
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--
'Faith without judgement merely degrades the spirit divine'
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