douyou7102 2016-07-16 11:16
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在Golang中最后一次出现模式后，HTML模板解析提取标头

I have a HTML code as a golang string, out of which I want to extract a particular header, after the last occurence of a pattern. To explain with an example:

    func main() {
    h := `
<html>
 <body>
  <a name="0"> text </a>
  <a name="1"> abc </a>
  <a name="2"> def ghi jkl </a>
  <a name="3"> abc </a>
  <a name="4"> Some text </a>
 </body>
</html>`

    pattern := "abc"

    // Now I want <a name="3"> to be printed. I mean, when someone
    // searches for the pattern abc, the last occurence is the <a>
    // section with the name "3". If the pattern is "def" then "2"
    // should be printed, if the pattern is "text" then 4 should
    // be printed

}

Any idea how I can do this ? I played around with the templates and the Scanner packages but could not get it working.

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  • douyingmou1389 2016-07-16 18:17
    关注

    That depends on what the html input is. You may be able to get away with using regexp, but if you're working with arbitrary html, you're going to have to use a full html parser, such as https://godoc.org/golang.org/x/net/html.

    For example, using goquery (which uses x/net/html):

    package main

import (
        "fmt"
        "strings"

        "github.com/PuerkitoBio/goquery"
)

func main() {
        h := `
<html>
 <body>
  <a name="0"> text </a>
  <a name="1"> abc </a>
  <a name="2"> def ghi jkl </a>
  <a name="3"> abc </a>
  <a name="4"> Some text </a>
 </body>
</html>`

        pattern := "abc"

        doc, err := goquery.NewDocumentFromReader(strings.NewReader(h))
        if err != nil {
                panic(err)
        }

        doc.Find("a").Each(func(i int, s *goquery.Selection) {
                if strings.TrimSpace(s.Text()) == pattern {
                        name, ok := s.Attr("name")
                        if ok {
                                fmt.Println(name)
                        }
                }
        })

}

    EDIT: or instead of the doc.Find part you may be able to use a contains selector depending on your actual input:

    // Don't do this if pattern is arbitrary user input
name, ok := doc.Find(fmt.Sprintf("a:contains(%s)", pattern)).Last().Attr("name")
if ok {
        fmt.Println(name)
}
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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