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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;

import org.apache.commons.lang.StringUtils;

/**
 * 操作符
 * @author 汪浩淼 [ [email protected] ]
 * @since 14-3-7 下午3:43
 */
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);
        }
    };
    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;
    }
}