public RuleAST parseArtificialRule(final Grammar g, String ruleText) {
ANTLRLexer lexer = new ANTLRLexer(new ANTLRStringStream(ruleText));
GrammarASTAdaptor adaptor = new GrammarASTAdaptor(lexer.getCharStream());
CommonTokenStream tokens = new CommonTokenStream(lexer);
lexer.tokens = tokens;
ToolANTLRParser p = new ToolANTLRParser(tokens, tool);
p.setTreeAdaptor(adaptor);
try {
ParserRuleReturnScope r = p.rule();
RuleAST tree = (RuleAST) r.getTree();
GrammarTransformPipeline.setGrammarPtr(g, tree);
GrammarTransformPipeline.augmentTokensWithOriginalPosition(g, tree);
return tree;
} catch (Exception e) {
tool.errMgr.toolError(
ErrorType.INTERNAL_ERROR,
"error parsing rule created during left-recursion detection: " + ruleText,
e);
}
return null;
}
