[antlr-interest] Tree grammar: How to handle rule arguments
Bart Kiers
bkiers at gmail.com
Fri Oct 15 23:26:41 PDT 2010
On Sat, Oct 16, 2010 at 1:16 AM, Stephanie Balzer <
stephanie.balzer at gmail.com> wrote:
>
> ... What is the meaning of id+= above?
>
>
A java.util.List is defined at the start of the rule and
all Identifier-tokens are added to it.
Token id=null;
List list_id=null; *// <- !!!*
try {
// Test.g:17:3: (id+= Identifier ( ',' id+= Identifier )* )
// Test.g:17:6: id+= Identifier ( ',' id+= Identifier )*
{
id=(Token)match(input,Identifier,FOLLOW_Identifier_in_ids80);
if (list_id==null) list_id=new ArrayList(); *// <- !!!*
list_id.add(id); *// <- !!!*
...
Regards,
Bart.
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