Fix interpolation unparse.

Fix interpolation unparse.

Formerly, string interpolation parts were put into a node list with null
delimiter, which was converted to single space string.  That lead to extra
space when unparsing interpolation: '$a $b' -> '$a  $b'.

Make empty string delimiter explicit and do not augument it with an additional
space.

R=smok@google.com

Committed: https://code.google.com/p/dart/source/detail?r=10073

[Roman, 2012-07-31 17:21:20]

lgtm

https://chromiumcodereview.appspot.com/10824113/diff/1/lib/compiler/implement...
File lib/compiler/implementation/scanner/listener.dart (right):

https://chromiumcodereview.appspot.com/10824113/diff/1/lib/compiler/implement...
lib/compiler/implementation/scanner/listener.dart:874: NodeList partNodes = new
NodeList(null, parts, null, const SourceString(""));
>80 chars

Also, maybe leave it as is, since you made nodelist to not emit unnecessary
whitespaces? (it's just thinking about minimal modifications)

[Anton Muhin, 2012-07-31 17:43:31]

https://chromiumcodereview.appspot.com/10824113/diff/1/lib/compiler/implement...
File lib/compiler/implementation/scanner/listener.dart (right):

https://chromiumcodereview.appspot.com/10824113/diff/1/lib/compiler/implement...
lib/compiler/implementation/scanner/listener.dart:874: NodeList partNodes = new
NodeList(null, parts, null, const SourceString(""));
I'll fix 80, but would rather provide explicit empty string delimiter as it
appears to be better as it more explicit.  Will revert if need be.

On 2012/07/31 17:21:20, Roman wrote:
> >80 chars
> 
> Also, maybe leave it as is, since you made nodelist to not emit unnecessary
> whitespaces? (it's just thinking about minimal modifications)