// TODO (sam): should we allow this to throw an exception instead of returning null?
@Nullable
public <T extends ATNState> T newState(@NotNull Class<T> nodeType, GrammarAST node) {
try {
Constructor<T> ctor = nodeType.getConstructor();
T s = ctor.newInstance();
if (currentRule == null) s.setRuleIndex(-1);
else s.setRuleIndex(currentRule.index);
atn.addState(s);
return s;
} catch (Exception e) {
ErrorManager.internalError("can't create ATN node: " + nodeType.getName(), e);
}
return null;
}
protected void _createATN(@NotNull Collection<Rule> rules) {
createRuleStartAndStopATNStates();
GrammarASTAdaptor adaptor = new GrammarASTAdaptor();
for (Rule r : rules) {
// find rule's block
GrammarAST blk = (GrammarAST) r.ast.getFirstChildWithType(ANTLRParser.BLOCK);
CommonTreeNodeStream nodes = new CommonTreeNodeStream(adaptor, blk);
ATNBuilder b = new ATNBuilder(nodes, this);
try {
setCurrentRuleName(r.name);
Handle h = b.ruleBlock(null);
rule(r.ast, r.name, h);
} catch (RecognitionException re) {
ErrorManager.fatalInternalError("bad grammar AST structure", re);
}
}
}