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c-resolver

v1.2.1

Published

crawler tool

Downloads

6

Readme

c-resolver a tool for crawler

Installation

npm install c-resolver

example

get something you need from test.html

<html>
<head>
    <script type="text/javascript">
        let test = function () {
            return "tseian.com";
        }
    </script>
</head>
<body>
    <div class="divClass">
        <h1 class="h1Class">h1Text</h1>
        <input value="inputValue" />
        <ul class="ulClass">
            <li>l1</li>
            <li>l2</li>
            <li>l3</li>
            <li>l4</li>
        </ul>
    </div>
</body>
</html>
  • get attribute value
    • get class name from h1
          const define = {
              "name": "item",  
              "type": "item",  
              "process": "processItem", 
              "match": "/", 
              "filter": "div",  
              "define": 
                  [{
                      "name": "name",
                      "type": "att",
                      "att": "class",
                      "match": "./",
                      "process": "[COMMON_STR_PROCESS]",
                      "filter": "h1"
                  }]
          };
      
          function Test() {
              this.processItem = function (item) { //handle item befor output
                  return item;
              };
              return this;
          }
          let res = resolver(define, html, new Test());
          /**
           * res = {item:{name:"h1Class"}}
           * /
      
      
      • get a list from ul->li
         const define = {
              "name": "item",
              "type": "item",
              "process": "processItem",
              "match": "/",
              "filter": "ul",
              "define":
                  [{
                      "name": "list",
                      "match": "./",
                      "type": "list",
                      "filter": "li",
                      "process": "processList",
                      "define": [{
                          "name": "name",
                          "type": "text",
                          "process": "[COMMON_STR_PROCESS]",
                      }]
                  }]
          };
        
          class Test {
              processItem(item) {
                  return item;
              };
              processList(list) {
                  return list;
              }
          }
        
          let res = resolver(define, html, new Test());
          /**
           * res = {item:[{"name":"l1"},{"name":"l2"},{"name":"l3"},{"name":"l4"}]}
           * /

-there are more example

how define define&process

  • "name": "key", //outut obejct key
  • "type": "valueType", //value type:
    • item: output value is a object,
    • lis: output value is a array(collection)
    • text: output value is a string
    • att: output value is a string(if type is att, should define att value )
  • "att": "attName", //element attribute name
  • "process": "processItem", //a function excute before output with param
  • "match": "/", // cheerio will find element by selector(filter) in the following element object
    • '/' is root element obejct from cheerio.load(root element html)
    • "./" is father element object
  • "filter": "div", // element selector

process

must be a function and return output value you want