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There is a newer version: 2.0.0
package cn.allbs.hj212.core;

import java.io.IOException;
import java.io.PushbackReader;
import java.io.Reader;
import java.lang.reflect.Field;
import java.nio.CharBuffer;
import java.util.Optional;
import java.util.function.Consumer;

/**
 * 功能:
 *
 * @author chenQi
 */
public class ReaderStream {

    private PushbackReader reader;
    private int bufSize = 1024;
    private ReaderMatch childMatch;
    private ParentMatch parentMatch;

    public static ReaderStream of() {
        return new ReaderStream<>(null);
    }

    public static ReaderStream of(PushbackReader reader) {
        return new ReaderStream<>(reader);
    }

    public static ReaderStream of(Reader reader) {
        return new ReaderStream<>(reader, -0);
    }

    public static ReaderStream of(Reader reader, int pushBackCount) {
        return new ReaderStream<>(reader, pushBackCount);
    }

    public ReaderStream(PushbackReader reader) {
        use(reader);
    }

    public ReaderStream(Reader reader, int bufSize) {
        use(reader, bufSize);
    }

    public ReaderStream(PushbackReader reader, int bufSize, ParentMatch parentMatch) {
        use(reader, bufSize, parentMatch);
    }

    public ReaderStream(Reader reader, int bufSize, ParentMatch parentMatch) {
        use(reader, bufSize, parentMatch);
    }


    public ReaderStream use(PushbackReader reader) {
        Field field = null;
        try {
            field = reader.getClass().getDeclaredField("buf");
            field.setAccessible(true);
            char[] chars = (char[]) field.get(reader);
            if (chars.length < 1) {
                this.reader = new PushbackReader(reader, this.bufSize);
                return this;
            }
            this.bufSize = chars.length;
            this.reader = reader;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return this;
    }

    public ReaderStream use(Reader reader) {
        return use(reader, -0);
    }

    public ReaderStream use(Reader reader, int bufSize) {
        if (bufSize > 0) {
            this.bufSize = bufSize;
        }
        this.reader = new PushbackReader(reader, this.bufSize);
        return this;
    }

    public ReaderStream use(PushbackReader reader, int bufSize, ParentMatch parentMatch) {
        if (bufSize < 1) {
            this.reader = new PushbackReader(reader, this.bufSize);
            this.parentMatch = parentMatch;
            return this;
        }
        this.bufSize = bufSize;
        this.reader = reader;
        this.parentMatch = parentMatch;
        return this;
    }

    public ReaderStream use(Reader reader, int bufSize, ParentMatch parentMatch) {
        if (bufSize > 0) {
            this.bufSize = bufSize;
        }
        this.reader = new PushbackReader(reader, this.bufSize);
        this.parentMatch = parentMatch;
        return this;
    }


    protected PushbackReader reader() {
        return reader;
    }

    protected int bufSize() {
        return bufSize;
    }


    /**
     * 接下来的一个字符
     *
     * @return SingleCharMatch
     */
    public SingleCharMatch> next() {
        SingleCharMatch> charMatch = new SingleCharMatch<>(this);
        this.childMatch = charMatch;
        return charMatch;
    }

    /**
     * 接下来的几个字符
     *
     * @param count 个数
     * @return MultipleCharMatch
     */
    public MultipleCharMatch> next(int count) {
        MultipleCharMatch> charMatch = new MultipleCharMatch<>(this, count);
        this.childMatch = charMatch;
        return charMatch;
    }

    public ParentMatch back() {
        return parentMatch;
    }

    public Optional