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/*
* GodoOS - A lightweight cloud desktop
* Copyright (C) 2024 https://godoos.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package convert
import (
"bytes"
"io"
"regexp"
"strings"
"golang.org/x/net/html"
)
// 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
}