ParsingUtils.java 文件源码

public static SyntaxError getErrorUnderCursor(java.util.List<SyntaxError> errors, int offset) {
    for (SyntaxError e : errors) {
        int a, b;
        RecognitionException cause = e.getException();
        if ( cause instanceof LexerNoViableAltException) {
            a = ((LexerNoViableAltException) cause).getStartIndex();
            b = ((LexerNoViableAltException) cause).getStartIndex()+1;
        }
        else {
            Token offendingToken = (Token)e.getOffendingSymbol();
            a = offendingToken.getStartIndex();
            b = offendingToken.getStopIndex()+1;
        }
        if ( offset >= a && offset < b ) { // cursor is over some kind of error
            return e;
        }
    }
    return null;
}