...
| Code Block |
|---|
CommonTokenStream tokens = new CommonTokenStream(lexer); ... CommonTreeNodeStream nodes = new CommonTreeNodeStream(t); // AST nodes have payloads that point into token stream nodes.setTokenStream(tokens); |
The generated code for $ruleref.text looks like:
| Code Block |
|---|
input.getTokenStream().toString(
input.getTreeAdaptor().getTokenStartIndex(ruleref.start),
input.getTreeAdaptor().getTokenStopIndex(ruleref.start));
|
input.getTokenStream() is probably the source of the null pointer if you've not called setTokenStream.