cn.wanghaomiao.xpath.core.NodeTreeBuilderStateMachine Maven / Gradle / Ivy

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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 cn.wanghaomiao.xpath.core;

import cn.wanghaomiao.xpath.model.Node;
import cn.wanghaomiao.xpath.model.Predicate;
import cn.wanghaomiao.xpath.util.EmMap;

/**
 * 用于生成xpath语法树的有限状态机
 * @author 汪浩淼 [[email protected]]
 * @since 13-12-26 下午3:48
 */
public class NodeTreeBuilderStateMachine {
    BuilderState state = BuilderState.SCOPE;
    XContext context = new XContext();
    int cur=0;
    StringBuilder accum = new StringBuilder();
    enum BuilderState {
        SCOPE {
            @Override
            public void parser(NodeTreeBuilderStateMachine stateMachine, char[] xpath) {
                 while (stateMachine.cur|<|>=|<=|^=|\\*=|$=|~=|!=)'.+'")){
            while (index>=0){
                char tmp = preArray[index];
                if (tmp=='\''){
                    argDeep+=1;
                }
                if (argDeep==1&&tmp!='\''){
                    right.insert(0,tmp);
                }else if (argDeep==2&&EmMap.getInstance().commOpChar.contains(tmp)){
                    op.insert(0,tmp);
                    opFlag=1;
                }else if (argDeep>=2&&opFlag>0){
                    argDeep++;//取完操作符后剩下的都属于left
                    left.insert(0,tmp);
                }
                index-=1;
            }
        }else if (pre.matches(".+(\\+|=|-|>|<|>=|<=|^=|\\*=|$=|~=|!=)[^']+")){
            while (index>=0){
                char tmp = preArray[index];
                if (opFlag==0&&EmMap.getInstance().commOpChar.contains(tmp)){
                    op.insert(0,tmp);
                }else {
                    if (op.length()>0){
                        left.insert(0,tmp);
                        opFlag=1;
                    }else {
                        right.insert(0,tmp);
                    }
                }
                index-=1;
            }
        }

        predicate.setOpEm(EmMap.getInstance().opEmMap.get(op.toString()));
        predicate.setLeft(left.toString());
        predicate.setRight(right.toString());
        predicate.setValue(pre);
        return predicate;
    }
}