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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;
/*
   Copyright 2014 Wang Haomiao

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */
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
 */
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;
    }
}