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