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package office
import (
"bytes"
"io"
"os"
"regexp"
"strings"
"golang.org/x/net/html"
)
func html2txt(filename string) (string, error) {
file, err := os.Open(filename)
if err != nil {
return "", err
}
defer file.Close()
return ConvertHTML(file)
}
// 去除字符串中的HTML标签
func TrimHtml(text string) string {
// 去除字符串中的HTML标签
re := regexp.MustCompile(`</?\w+[^>]*>`)
text = re.ReplaceAllString(text, "")
// 先去除所有空格
text = strings.ReplaceAll(text, " ", "")
// 合并多个连续换行为单个换行
re = regexp.MustCompile(`\n+`)
text = re.ReplaceAllString(text, "\n")
return strings.TrimSpace(text)
}
func ConvertHTML(r io.Reader) (string, error) {
doc, err := html.Parse(r)
if err != nil {
return ``, err
}
var title string
var content bytes.Buffer
var f func(*html.Node)
f = func(n *html.Node) {
if n.Type == html.ElementNode {
switch n.Data {
case "title":
if firstChild := n.FirstChild; firstChild != nil && firstChild.Type == html.TextNode {
title = firstChild.Data
}
case "script", "style", "img": // 忽略这些元素及其子元素
return
}
}
if n.Type == html.TextNode {
content.WriteString(n.Data)
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
f(c)
}
}
f(doc)
contentStr := content.String()
contentStr = TrimHtml(contentStr)
if title == "" {
title = "未命名网页"
}
return title + "\n" + strings.TrimSpace(contentStr), nil
}