Implement await and async for the js-ast.

Implement await and async for the js-ast.

Implementing a new expression 'await e' in the js mini-parser and printer.

Implementing async, async*, sync* function body modifiers.

Also implementing while, do, switch, case, labelled statement in the js mini parser.

This is in preparation for an await-desugaring transformation on the js ast.

BUG=
R=asgerf@google.com, floitsch@google.com

Committed: https://code.google.com/p/dart/source/detail?r=42999

[sigurdm, 2015-01-16 15:08:56]

sigurdm@google.com changed reviewers:
+ floitsch@google.com

[floitsch, 2015-01-16 15:31:12]

floitsch@google.com changed reviewers:
+ asgerf@google.com

[floitsch, 2015-01-16 15:31:13]

LGTM, but I would like to have Asger's opinion, too.

[asgerf, 2015-01-16 16:23:26]

LGTM with some quick fixes.

https://codereview.chromium.org/858573002/diff/1/pkg/compiler/lib/src/js/buil...
File pkg/compiler/lib/src/js/builder.dart (right):

https://codereview.chromium.org/858573002/diff/1/pkg/compiler/lib/src/js/buil...
pkg/compiler/lib/src/js/builder.dart:1265: acceptCategory(COLON);
I think this should be expectCategory

https://codereview.chromium.org/858573002/diff/1/pkg/compiler/lib/src/js/buil...
pkg/compiler/lib/src/js/builder.dart:1294: if (lastToken == "while")
error("Missing while after do body.");
lastToken != 'while'

[sigurdm, 2015-01-20 07:54:56]

Thanks for the review

https://codereview.chromium.org/858573002/diff/1/pkg/compiler/lib/src/js/buil...
File pkg/compiler/lib/src/js/builder.dart (right):

https://codereview.chromium.org/858573002/diff/1/pkg/compiler/lib/src/js/buil...
pkg/compiler/lib/src/js/builder.dart:1265: acceptCategory(COLON);
On 2015/01/16 16:23:26, asgerf wrote:
> I think this should be expectCategory

Done.

https://codereview.chromium.org/858573002/diff/1/pkg/compiler/lib/src/js/buil...
pkg/compiler/lib/src/js/builder.dart:1294: if (lastToken == "while")
error("Missing while after do body.");
On 2015/01/16 16:23:26, asgerf wrote:
> lastToken != 'while'

Yes - thank you!

[sigurdm, 2015-01-20 08:10:58]

Committed patchset #2 (id:20001) manually as 42999 (presubmit successful).