Hi,
I need to embed actions in a tree parser for an old specific domain
language which
uses unconditional jumps like "GOTO" statements.
I've made two rules in my tree parser:
The first save the label node into a map called labels
The second rule should retrieve the index of that node in order to
jump on the node stream.
-------------------------
@members {
//global labels
public Map labels;
}
//goto labels
label : ^(LABEL li=labelItem lineTerminator)
{ //salvataggio nodo della label
CommonTree labelNode = null;
CommonTreeNodeStream stream = (CommonTreeNodeStream)
input;
labelNode = (CommonTree) $label.start.getChild(0);
if (labelNode != null)
{
labels.put(new String($li.text),labelNode);
}
}
;
//unconditional jump
jump : ^(JUMP l=labelItem lineTerminator)
{
CommonTree labelNode = null;
CommonTreeNodeStream stream = (CommonTreeNodeStream)
input;
labelNode = (CommonTree) $jump.start.getChild(0);
if (labelNode != null)
{
String labelName = $l.text;
CommonTree jumpNode = (CommonTree)
labels.get(labelName);
if (jumpNode != null)
{
stream.push(stream.getNodeIndex(jumpNode));
}
}
}
;
//lineTerminator rule omitted
---------------
The problem I'had is about accessing "getNodeIndex" method of
CommonTreeNodeStream class.
That method is "protected" and code generated does not compile:
getNodeIndex(java.lang.Object) has protected access in
org.antlr.runtime.tree.CommonTreeNodeStream
How can I avoid this problem??
Are examples like this :
http://groups.google.it/group/il-antlr-interest/browse_thread/thread/b2a29d672b603e57/
still working?
I used antlr 3.1.1 and antlrWorks 1.2.2
Target language Java.
Thanks in advance.
Giovanni
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