sys.isVariableDefined

[Anonymous]

hello

Is there a way to test if a variable is defined in a function to avoid the bug
in sys.isVariableDefined ?

Thank's

[Alex Wajda]

not sure I understand what bug you are talking about. sys.isVariableDefined
does exactly what it's meant to do. At least it is so in WH 2.1

[Anonymous]

sorry I was not very clear...

from a function I was trying to test a variable defined outside the function
and not passed as parameter with the 2.0 version, but it wasn't working.

[Alex Wajda]

yes, in WH 2.0 there are some troubles with accessing outer context from
inside the function. That's because in WH 2.0 there is no true hierarchical
context. If I remember correctly in WH 2.0 there is a hack for this issue -
from a function you may use "caller." prefix to access the outer context
variable. Consider the example below.

<var-def name="x"/>
<function name="f">
    <var name="caller.x"/>
    <function name="k">
        <var name="caller.caller.x"/>
    </function>
    <call name="k"/> <!-- OK --> 
</function>
<call name="f"/>
<call name="k"/> <!-- THIS WILL BREAK as from inside function K variable X will be accessible as "caller.x" instead of "caller.caller.x" -->