On Fri, Jun 19, 2015 at 9:30 PM, Bob Myers <[email protected]> wrote:
> I suspect this is beyond the capabilities of sweet, but haven't really
> tried.
I think it's doable with sweet. You need to use infix macros which are a
bit more complicated than standard macros though.
Here's a first stab.
```
macro # {
// let p #= o
rule infix { let $prop | = $obj:expr } => {
let $prop = $obj.$prop
}
// p = 42 # o
rule infix { $prop = $val:expr | $obj:expr } => {
($obj.$prop || $val)
}
// [ p1, p2 ] # o
rule infix { [ $prop (,) ... ] | $obj:expr } => {
[ $($obj.$prop) (,) ...]
}
// { p1, p2 } # o
rule infix { { $prop (,) ... } | $obj:expr } => {
{
$($prop : $obj.$prop) (,) ...
}
}
// p # if o
rule infix { $prop:ident | if $obj:expr } => {
$obj && typeof $obj === "object" ? $obj.$prop : void 0
}
// q # (p # o)
rule infix { $prop:ident | $obj:expr } => { $obj.$prop }
}
macro @ {
// { p1, p2 } @ [1, 2]
rule infix { { $props (,) ... } | [ $el:expr (,) ... ] } => {
{
$($props : $el) (,) ...
}
}
}
```
This dosn't handle `{ p1, p22 # p2 } # o` but I think that totally possible
to handle.
--
-Tim
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