Hi Mike,
I think there may be a bug in the desugaring. My understanding is that the
only arguments to the quasi tag are the call site id & the SVE, and the SVE
contains only the substitution values, but in the desugaring example literal
portions are being passed to the quasiTag too:
quasiTag(unguessableId1234, "literalPortion\0 ", x, " literalPortion1"])
I think this should be:
quasiTag(unguessableId1234, x)
cheers,
G.
On Jun 15, 2011, at 5:49 PM, Mike Samuel wrote:
> 2011/6/15 Axel Rauschmayer <[email protected]>:
>> Quick feedback: I haven’t seen SVE (substitution value expression?) defined
>> anywhere and can’t find a description of using ${{var}} as syntactic sugar
>> for "{var:${var}}".
>
> SVE is defined in
> http://wiki.ecmascript.org/doku.php?id=harmony:quasis#substitution_body_syntax
> reproduced below:
>
> SVE
>
> Production Result
> QuasiLiteral :: QuasiTag`LiteralPortion QuasiLiteralTail
> SVE(QuasiLiteralTail)
> QuasiLiteralTail :: Substitution LiteralPortion QuasiLiteralTail
> array-concat(single-element-array(SVE(Substitution)),
> SVE(QuasiLiteralTail))
> QuasiLiteralTail :: ` an empty array
> Substitution :: $Identifier PrimaryExpression : Identifier
> Substitution :: ${SubstitutionModifier Identifier} PrimaryExpression
> SubstitutionBody :: Identifier IdentifierPathTail MemberExpression :
> str-concat(SV(Identifier), SV(IdentifierPathTail))
> IdentifierPathTail :: .IdentifierName IdentifierPathTail
> str-concat(“.”, SV(IdentifierName), SV(IdentifierPathTail))
> IdentifierPathTail :: ε the empty string, ““
>
> The SVE of a substitution is an expression that is evaluated in the
> scope in which the quasiliteral appears. The SVE of the quasi literal
> is the array of the SVE for each substitution.
>
> E.g. the SVE of quasitag`literalPortion0 $x literalPortion1 $y.z
> literalPortion2` is [x, y.z].
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