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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.util;
/*
   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 org.apache.commons.lang3.StringUtils;

/**
 * 操作符
 * @author 汪浩淼 [ [email protected] ]
 * @since 14-3-7
 */
public enum OpEm {
    PLUS("+"){
        @Override
        public Object excute(String left,String right) {
            int li = 0;
            if (StringUtils.isNotBlank(left)){
                li = Integer.parseInt(left);
            }
            int ri = 0;
            if (StringUtils.isNotBlank(right)){
                ri=Integer.parseInt(right);
            }
            return li + ri;
        }
    },
    MINUS("-"){
        @Override
        public Object excute(String left, String right) {
            int li = 0;
            if (StringUtils.isNotBlank(left)){
                li = Integer.parseInt(left);
            }
            int ri = 0;
            if (StringUtils.isNotBlank(right)){
                ri=Integer.parseInt(right);
            }
            return li - ri;
        }
    },
    EQ("="){
        @Override
        public Object excute(String left, String right) {
            return left.equals(right);
        }
    },
    NE("!="){
        @Override
        public Object excute(String left, String right) {
            return !left.equals(right);
        }
    },
    GT(">"){
        @Override
        public Object excute(String left, String right) {
            int li = 0;
            if (StringUtils.isNotBlank(left)){
                li = Integer.parseInt(left);
            }
            int ri = 0;
            if (StringUtils.isNotBlank(right)){
                ri=Integer.parseInt(right);
            }
            return li > ri;
        }
    },
    LT("<"){
        @Override
        public Object excute(String left, String right) {
            int li = 0;
            if (StringUtils.isNotBlank(left)){
                li = Integer.parseInt(left);
            }
            int ri = 0;
            if (StringUtils.isNotBlank(right)){
                ri=Integer.parseInt(right);
            }
            return li < ri;
        }
    },
    GE(">="){
        @Override
        public Object excute(String left, String right) {
            int li = 0;
            if (StringUtils.isNotBlank(left)){
                li = Integer.parseInt(left);
            }
            int ri = 0;
            if (StringUtils.isNotBlank(right)){
                ri=Integer.parseInt(right);
            }
            return li >= ri;
        }
    },
    LE("<="){
        @Override
        public Object excute(String left, String right) {
            int li = 0;
            if (StringUtils.isNotBlank(left)){
                li = Integer.parseInt(left);
            }
            int ri = 0;
            if (StringUtils.isNotBlank(right)){
                ri=Integer.parseInt(right);
            }
            return li <= ri;
        }
    },
    STARTWITH("^="){
        @Override
        public Object excute(String left, String right) {
            return left.startsWith(right);
        }
    },
    ENDWITH("$="){
        @Override
        public Object excute(String left, String right) {
            return left.endsWith(right);
        }
    },
    CONTAIN("*="){
        @Override
        public Object excute(String left, String right) {
            return left.contains(right);
        }
    },
    REGEX("~="){
        @Override
        public Object excute(String left, String right) {
            return left.matches(right);
        }
    },
    NOTMATCH("!~"){
        @Override
        public Object excute(String left, String right) {
            return !left.matches(right);
        }
    };
    private String val;
    private OpEm(String type){
        this.val = type;
    }
    public String val() {
        return this.val;
    }

    public Object excute(String left,String right){
        return null;
    }
}