On 4 February 2013 23:44, Brendan Eich bren...@mozilla.com wrote:
What's confusing?
The fact that you can have an object property without a colon and a
function without a function keyword. Then a property descriptor uses a
completely new syntax to define the same thing. Why?
On Tue, Feb 5, 2013 at 3:19 AM, gaz Heyes gazhe...@gmail.com wrote:
On 4 February 2013 23:44, Brendan Eich bren...@mozilla.com wrote:
What's confusing?
The fact that you can have an object property without a colon and a
function without a function keyword.
ES6 concise methods will make
Indeed, and given use of ES6, I expect things like this wouldn't be very
uncommon (I think is supposed to be Object.define right?):
Object.define(x, {
get a(){},
set a(v){},
get b(){},
c(){}
});
Instead of most current descriptor stuff (since enumerability and
configurability are rarely
On Tue, Feb 5, 2013 at 11:55 AM, Brandon Benvie
bran...@brandonbenvie.comwrote:
Indeed, and given use of ES6, I expect things like this wouldn't be very
uncommon (I think is supposed to be Object.define right?):
Nothing there yet, though I suspect Object.mixin() will have more traction.
Right, I think mixin is winning over define as the name. Same semantics
in either case.
Allen
On Feb 5, 2013, at 9:03 AM, Rick Waldron wrote:
On Tue, Feb 5, 2013 at 11:55 AM, Brandon Benvie bran...@brandonbenvie.com
wrote:
Indeed, and given use of ES6, I expect things like this
Though it's a little too long since this discussion, I've tried Allen's
idea in my parser and still find conflicting.
Consider the following rules:
PropertyAssignment :
IdentifierName PropertyName ( ) { FunctionBody }
PropertyAssignment :
PropertyName : AssignmentExpression
程劭非 wrote:
Though it's a little too long since this discussion, I've tried Allen's
idea in my parser and still find conflicting.
Consider the following rules:
PropertyAssignment :
IdentifierName PropertyName ( ) { FunctionBody }
PropertyAssignment :
PropertyName :
Michael Dyck wrote:
There's no way only if you're talking about an LR(0) parser. But an
LR(1) parser would have 1 token of lookahead to resolve the conflict:
-- if the next token is :, reduce IdentifierName to PropertyName;
-- if the next token is an IdentifierName, shift that.
-- if the
Brendan Eich wrote:
Don't forget method definition shorthand syntax, if the next token is
(. Then the method is named get, of course.
Yup. Like I said, I was ignoring the effect of other productions.
(That's what the OP appeared to be doing too.)
-Michael
On 4 February 2013 21:56, Michael Dyck jmd...@ibiblio.org wrote:
Brendan Eich wrote:
Don't forget method definition shorthand syntax, if the next token is
(. Then the method is named get, of course.
I find the syntax of set/get confusing:
({'get'x(){return 123;}}).x
gaz Heyes wrote:
I find the syntax of set/get confusing:
What's confusing?
({'get'x(){return 123;}}).x
That's not legal ES5.
/be
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Hi, everyone
I noticed both “IdentifierName” and “Identifier” appeared in
syntactical grammar of ES5. It seems a lexer will not be able to
decide a token to be an IdentifierName or Identifier during lexing
phase.
A similar problem is “get”. get is not a keyword but is used like a
keyword in
SpiderMonkey, at least, uses feed-forward from parser to lexer, a
one-bit mode flag:
http://mxr.mozilla.org/mozilla-central/search?string=TSF_KEYWORD_IS_NAME
/be
程劭非 wrote:
Hi, everyone
I noticed both “IdentifierName” and “Identifier” appeared in
syntactical grammar of ES5. It seems a lexer
If I was going to move something to the syntactic grammar it would probably be
the current definition of Identifier
Identifier :
IdentifierName but not ReservedWord
You might then lex all IdentifierNames (including ReservedWord) as
IdentifierName tokens and treat all occurrences of
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