It also does not work. x ** y ** z, if we allow it at all, must be right associative. It must parse as x ** (y ** z).
On Tue, Aug 25, 2015 at 10:08 AM, Mark S. Miller <erig...@google.com> wrote: > It does not work as well as simply omitting ** entirely. > > > On Tue, Aug 25, 2015 at 9:42 AM, Isiah Meadows <isiahmead...@gmail.com> > wrote: > >> I like this. It works very well. >> >> On Tue, Aug 25, 2015, 12:38 Claude Pache <claude.pa...@gmail.com> wrote: >> >>> >>> I think the following grammar could work. >>> Replace the current (ES2015) PostfixExpression production with: >>> >>> ``` >>> IncrementExpression: >>> LeftHandSideExpression >>> LeftHandSideExpression [no LineTerminator here] ++ >>> LeftHandSideExpression [no LineTerminator here] -- >>> ++ LeftHandSideExpression >>> -- LeftHandSideExpression >>> ``` >>> >>> And define UnaryExpression as: >>> >>> ``` >>> UnaryExpression: >>> IncrementExpression >>> delete UnaryExpression >>> void UnaryExpression >>> typeof UnaryExpression >>> ++ UnaryExpression >>> + UnaryExpression >>> -- UnaryExpression >>> - UnaryExpression >>> ~ UnaryExpression >>> ! UnaryExpression >>> IncrementExpression ** UnaryExpression >>> ``` >>> >>> where the following production (which exists only to avoid to >>> confusingly interpret, e.g., `++x++` as `+ +x++`): >>> >>> ``` >>> UnaryExpression: >>> ++ UnaryExpression >>> -- UnaryExpression >>> ``` >>> >>> yields a static SyntaxError (or a static ReferenceError if we want to be >>> 100% compatible ES2015). >>> >>> >>> That way, we have the following expected behaviour: >>> * in/decrement operators bind most tightly; >>> * unary and exponentiation operators are applied from right to left. >>> >>> >>> —Claude >>> >>> >>> _______________________________________________ >>> es-discuss mailing list >>> es-discuss@mozilla.org >>> https://mail.mozilla.org/listinfo/es-discuss >>> >> > > > -- > Cheers, > --MarkM > -- Cheers, --MarkM
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