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一个非常好用而且强大的基于xpath的html解析器。html的DOM树生成依赖Jsoup。Lexer 和 Parser基于Antlr4,支持完备的W3C XPATH 1.0标准语法，W3C规范：http://www.w3.org/TR/1999/REC-xpath-19991116。

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package org.seimicrawler.xpath.core;

import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import org.seimicrawler.xpath.exception.XpathParserException;

/**
 * @author github.com/zhegexiaohuozi [email protected]
 * @since 2018/3/13.
 */
public class Scope {
    private Elements context;
    private boolean isRecursion = false;
    private Scope parent;

    private Scope(Elements context){
        super();
        this.context = new Elements();
        this.context.addAll(context);
    }
    private Scope(Element context){
        super();
        this.context = new Elements();
        this.context.add(context);
    }

    public static Scope create(Elements elements){
        return new Scope(elements);
    }

    public static Scope create(Element el){
        return new Scope(el);
    }

    public static Scope create(Scope scope){
        return  new Scope(scope.context()).setParent(scope);
    }

    public Scope setParent(Scope scope){
        this.parent = scope;
        return this;
    }

    public Scope getParent() {
        return parent;
    }

    public void setContext(Elements context) {
        this.context = context;
    }

    public boolean isRecursion(){
        return isRecursion;
    }

    void recursion(){
        this.isRecursion = true;
    }

    public void notRecursion(){
        this.isRecursion = false;
    }

    public Elements context(){
        return this.context;
    }

    public Element singleEl(){
        if (context.size() == 1){
            return context.first();
        }
        throw new XpathParserException("current context is more than one el,total = "+context.size());
    }
}