What do you think of this iterator syntax?

Posted by ChaosPandion on Programmers See other posts from Programmers or by ChaosPandion
Published on 2011-01-29T23:30:40Z Indexed on 2011/01/29 23:32 UTC
Read the original article Hit count: 388

Filed under:

syntax

|

iterator

|

ecmascript

I've been working on an ECMAScript dialect for quite some time now and have reached a point where I am comfortable adding new language features. I would love to hear some thoughts and suggestions on the syntax.

Example

iterator Numbers {
    yield 1;
    yield 2;
    yield 3;
    if (true) {
        yield break;
    }
    yield continue iterator {
        yield 4;
        yield 5;
        yield 6;
    };
}

Syntax

IteratorDeclaration:

iterator Identifier { IteratorBody }

IteratorExpression:

iterator Identifier_opt { IteratorBody }

IteratorBody:

IteratorStatements_opt

IteratorStatements:

IteratorStatement IteratorStatements_opt

IteratorStatement:

Statement but not one of BreakStatement ContinueStatement ReturnStatement

YieldStatement

YieldBreakStatement

YieldContinueStatement

YieldStatement:

yield Expression ;

YieldBreakStatement:

yield break ;

YieldContinueStatement:

yield continue Expression ;

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