[antlr-interest] How to do iteration in Tree Grammar

轶凡 yifan.cby at taobao.com
Wed Sep 21 23:08:38 PDT 2011


Hi, I defined a tree grammar as below:

foo: ^(VIRTUAL_NODE bar*) {
  echo($bar.value);
};

bar returns [boolean value] : //… Omitted

The generated source of rule foo is like below:

public final void foo() throws XX
{
 boolean bar40 = false;
  do{
    //omitted
bar40=bar();
//omitted
  }while (true)
  echo(bar40)
}

Actually in the rule ‘foo’, I want to do some actions against every ‘bar’, not the final bar’s value, code in imagination:

public final void foo() throws XX
{
 boolean bar40 = false;
  do{
    //omitted
bar40=bar();
if (bar40){
echo(bar40);
return;
}
//omitted
  }while (true)
  echo(bar40)
}
How to change the rule ‘foo’ to archive my goal?

Thanks for your help!

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