SyntaxError.java 文件源码

public Token getOffendingSymbol() {
    if ( e instanceof NoViableAltException ) {
        // the error node in parse tree will have the start token as bad token
        // even if many lookahead tokens were matched before failing to find
        // a viable alt.
        return ((NoViableAltException) e).getStartToken();
    }
    return offendingSymbol;
}