[Laszlo-dev] Possible code generation error within compiler for ternary operator expressions?

[Raju Bitter]

I've run into a problem with the ternary operator within LZX. Take the
following JS snippet:

    var result = 10;
    var visible = false;
    (result == 10) ? visible = true : visible = false;

I can run the code snippet in Rhino and Chrome JavaScript console
without any problems. I can use the same code within an AS3
application. But the OpenLaszlo compiler shows the following error
message for both DHTML and SWF10:

org.openlaszlo.sc.CompilerError:
../../app/lzx/test/ou-jira-bugs/ternary/ternary.lzx: 7: Error: Access
of undefined property result, in line: result == 10 ? (visible = true)
: visible = false;
../../app/lzx/test/ou-jira-bugs/ternary/ternary.lzx: 7: Error: Access
of undefined property visible, in line: result == 10 ? (visible =
true) : visible = false;
../../app/lzx/test/ou-jira-bugs/ternary/ternary.lzx: 7: Error: Access
of undefined property visible, in line: result == 10 ? (visible =
true) : visible = false;

Here's the full LZX code I use for testing:
<canvas debug="true">

  <node id="theNode">
    <method name="testMethod">
      var result = 999,
        visible = false;
      (result == 999) ? visible = true : visible = false;
      Debug.info("result=", result);
    </method>
  </node>

  <button text="testMethod" onclick="theNode.testMethod()" />

</canvas>

Looking into the generated JS code for the DHTML runtime, I can see
that the expression is not compiled correctly:
Original code:
Generated: result == 999 ? (visible = true) : visible = false;


Generated code:
var $lzsc$temp = function() { /* -*- file: -*- */
        try { /* -*- file: ternary.lzx#5 -*- */
            var result_$0 = 999,
                visible_$1 = false;

            result == 999 ? (visible = true) : visible = false;
            Debug.info("result=", result_$0)
        } /* -*- file: -*- */
        catch ($lzsc$e) {
            if ((Error["$lzsc$isa"] ? Error.$lzsc$isa($lzsc$e) :
$lzsc$e instanceof Error) && $lzsc$e !== lz["$lzsc$thrownError"]) {
                $reportException("ternary.lzx", 4, $lzsc$e)
            } else {
                throw $lzsc$e
            }
        }
    };

Ternary operator expressions work with the following synax:
      visible = (result == 999) ? true: false;

Looks like a bug to me.

- Raju