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Apache-2.0

#sipsoup

sipsoup是一个基于Jsoup的xpath实现,他将Jsoup的cssQuery变成了xpath语法的一部分,可以实现在xpath内部执行cssQuery和xpath混合模式的链式文档查询

是一款纯Java开发的使用xpath解析html的解析器,xpath语法分析与执行完全独立,html的DOM树生成借助Jsoup。

sipSoup本身也应该叫做Xsoup,JsoupXpath之类的,但是他出身太晚了,名字被占了,但是我觉得还是应该喝汤,所以我喜欢sipSoup这个名字。

每一个爬虫框架作者都应该实现一个xpath, sipsoup 出现也是如此,在我设计爬虫框架vscrawler的时候,考虑如何定位抽取数据,甚至如何整合其他爬虫框架的抽取API, 然后调研了Xsoup和JsoupXpath,看到JsoupXpath眼前一亮,我觉得他肯定适合我的需要,所以尝试使用JsoupXpath对接了Xsoup,因为JsoupXpath实现了xpath2.0的绝大部分语法功能, 使用JsoupXpath可以非常灵活自由的实现xpath。但是在整合的过程,我发现JsoupXpath有一点不符合我的需求,就是他都是运行的适合抛错,我希望能够在编译xpath表达式的时候,就可以做语法 检查,我希望JsoupXpath可以类似Xsoup一样做链式抽取,我希望规则模型可以缓存。所以尝试着对JsopXpath进行重构。

SipSoup本质是对JsoupXpath重构而来的,里面少部分代码仍然是JsoupXpath的,这里非常感谢JsoupXpath,但是绝大部分代码都被替换了,所以本身SipSoup不算依赖JsoupXpath(组件结构几乎还和JsoupXpath保持了一致)。 目前看来,SipSoup完全兼容JsoupXpath,因为它本身自JsoupXpath发展而来。关于JsoupXpath的相关资料,参考 JSoupXpath

以下为改动点

  1. 函数重构,JsoupXpath使用反射加载一个类里面的静态函数,SipSoup则是使用接口实现的方式扩展
  2. 类扫描,默认函数注册,是通过扫描器自动注册,如果你需要扩展自己的函数,可以将自己的函数实现放到com.virjar.sipsoup.function,就能够自动注册
  3. 轴函数,SipSoup不光支持一般的谓语函数扩展,同时支持轴函数,抽取函数扩展。而且允许函数待参数
  4. css('cssQuery') css是SipSoup内置的要给轴函数,它可以将css查询表达式传递给css轴,这是SipSoup一个大的突破,他比Xsoup更加容易的实现了css和xpath混合链式抽取
  5. 复杂谓语,目前来说,SipSoup对谓语的支持是我发现的最完善的,支持函数嵌套,表达式嵌套,括号嵌套,处理空格,转义等问题。SipSoup的谓语模块,是我花了整整一天写出来的计算器😄
  6. 谓语数据类型扩展,在xpath语法中,我定义了数据类型分为: 字符串,数字,运算符,xpath,函数,属性取值动作,布尔类型,复合表达式 这几种类型,其中除运算符以外的其他数据类型都是可以扩展或者卸载的。(boolean类型是开始设计的时候没有的类型,然后通过这个机制注册了boolean,后来又将其添加到了默认类型了)
  7. 运算符重载,运算符重载一般c++ 听得挺多,含义就是可以通过重载运算符实现操作符的行为改写。比如"+"加法操作,遇到数字执行加法,遇到字符串执行字符串链接,你可以重写他,遇到数字转化数字,失败使用默认值等等
  8. 多xpath组合逻辑,可以实现多个xpath的多重与或计算,对应集合实现交集,并集计算

总之,SipSoup已经是一个高度扩展的Xpath语法分析器,通过灵活的扩展以及Jsoup整合,成为了一个异常强大的xpath工具

demo如下:

  1. 格式化输出节点文本 allText allText()
  2. position使用,选取所有偶数节点 position
  3. 注册新的函数 RegisterNewFunctionTest.java
  4. 注册新的操作符 运算符重载
  5. 福利,美女爬虫 实际demo
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简介

sipsoup是一个基于Jsoup的xpath实现,他将Jsoup的cssQuery变成了xpath语法的一部分,可以实现在xpath内部执行cssQuery和xpath混合模式的链式文档查询 展开 收起
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