Examples with ParseCancellationException org.antlr.v4.runtime.misc.ParseCancellationException used on opensource projects

Example 31 with ParseCancellationException

use of org.antlr.v4.runtime.misc.ParseCancellationException in project jwt by emweb.

the class CssParser method parse.

private StyleSheet parse(CharStream stream) throws RecognitionException, ParseCancellationException {
    errorListener_.reset();
    Listener listener = new Listener();
    Css22Lexer lex = new Css22Lexer(stream);
    lex.removeErrorListener(ConsoleErrorListener.INSTANCE);
    lex.addErrorListener(errorListener_);
    CommonTokenStream tokens = new CommonTokenStream(lex);
    Css22Parser parser = new Css22Parser(tokens);
    parser.addParseListener(listener);
    parser.removeErrorListener(ConsoleErrorListener.INSTANCE);
    parser.addErrorListener(errorListener_);
    parser.styleSheet();
    if (!getLastError().isEmpty()) {
        return null;
    } else {
        return listener.getCurrentStylesheet();
    }
}

Example 32 with ParseCancellationException

use of org.antlr.v4.runtime.misc.ParseCancellationException in project ksql by confluentinc.

the class GrammarParseUtil method getParseTree.

static <T extends ParserRuleContext> T getParseTree(final String text, final Function<SqlBaseParser, T> parseFunction) {
    final SqlBaseLexer sqlBaseLexer = new SqlBaseLexer(new CaseInsensitiveStream(CharStreams.fromString(text)));
    final CommonTokenStream tokenStream = new CommonTokenStream(sqlBaseLexer);
    final SqlBaseParser sqlBaseParser = new SqlBaseParser(tokenStream);
    sqlBaseLexer.removeErrorListeners();
    sqlBaseLexer.addErrorListener(ERROR_LISTENER);
    sqlBaseParser.removeErrorListeners();
    sqlBaseParser.addErrorListener(ERROR_LISTENER);
    try {
        // first, try parsing w/ potentially faster SLL mode
        sqlBaseParser.getInterpreter().setPredictionMode(PredictionMode.SLL);
        return castContext(parseFunction.apply(sqlBaseParser));
    } catch (final ParseCancellationException ex) {
        // if we fail, parse with LL mode
        // rewind input stream
        tokenStream.seek(0);
        sqlBaseParser.reset();
        sqlBaseParser.getInterpreter().setPredictionMode(PredictionMode.LL);
        return castContext(parseFunction.apply(sqlBaseParser));
    }
}