[antlr-interest] Check for null ?

[Vincent Dupuis]

Hello,

I would like to know if I need to "check for null" for every 
optional sub rule return value.

Like in the following example:

event
@init
{
    StringTemplate ddd = new StringTemplate();
    StringTemplate iii = new StringTemplate();
    String ggg = new String();
}
    :   'on' n=IDENT ('if' i=identifierList)? ('do' d=identifierList)? ('goto' g=IDENT)?
        {
            if (d != null) ddd = $d.st;
            if (i != null) iii = $i.st;
            if (g != null) ggg = $g.text;
        }
        -> event(eventName={$n.text}, doList={ddd}, ifList={iii}, gotoSate={ggg})
    ;

Thank you,

Vincent


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