MysqlCharStream.java 文件源码

@Override
public int LA(int i) {
    if ( i==0 ) {
        return 0; // undefined
    }
    if ( i<0 ) {
        i++; // e.g., translate LA(-1) to use offset i=0; then data[p+0-1]
        if ( (p+i-1) < 0 ) {
            return IntStream.EOF; // invalid; no char before first char
        }
    }

    if ( (p+i-1) >= n ) {
           return IntStream.EOF;
       }
    int ch = this.buf.get(p+i-1);
    return ch;
}