ANTLRLexerAdaptor.java 文件源码

@Override
public void start(CharSequence buffer, int startOffset, int endOffset, int initialState) {
    this.buffer = buffer;
    this.endOffset = endOffset;

    CharStream in = new CharSequenceCharStream(buffer, endOffset, IntStream.UNKNOWN_SOURCE_NAME);
    in.seek(startOffset);

    ANTLRLexerState state;
    if (startOffset == 0 && initialState == 0) {
        state = getInitialState();
    } else {
        state = toLexerState(initialState);
    }

    applyLexerState(in, state);
    advance();
}