[parenscript-devel] Bug: incorrect JS emitted for binary operators with more than 2 operands

[Vladimir Sedach]

Ok, I did the temporary variable thing.

On Thu, Aug 6, 2009 at 7:12 PM, Daniel Gackle<danielgackle at gmail.com> wrote:
> Given that the code currently emitted is incorrect, it's not like you have
> to worry about backward compatibility. Throwing an error would probably
> suffice.
>
> On Thu, Aug 6, 2009 at 7:04 PM, Vladimir Sedach <vsedach at gmail.com> wrote:
>>
>> I ran across this bug a long time ago. The equivalent of (> x y z) in
>> JS would be (x > y) & (y > z). 'y' is evaluated multiple times, so
>> you'd need to introduce a temporary variable for it. I wonder if there
>> is any other approach (other than limiting the comparison operator to
>> two arguments)?
>>
>> Vladimir
>>
>> On Wed, Aug 5, 2009 at 1:45 PM, Daniel Gackle<danielgackle at gmail.com>
>> wrote:
>> > PS generates code for expressions like (> x y z) as if the operators
>> > worked
>> > the same way in JS and Lisp, but they don't. For example,
>> >
>> > (ps (> 3 2 1))
>> >  => "3 > 2 > 1;"
>> >
>> > ... is an expression that is true in Lisp but false in JS.
>> >
>> > Daniel
>> >
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>> >
>> >
>>
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>
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