wp-go/plugins/Excerpt.go

package plugins

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"github/fthvgb1/wp-go/helper"
	"github/fthvgb1/wp-go/models"
	"regexp"
	"strings"
	"unicode/utf8"
)

var removeWpBlock = regexp.MustCompile("<!-- /?wp:.*-->")
var more = regexp.MustCompile("<!--more(.*?)?-->")
var tag = regexp.MustCompile(`<.*?>`)
var limit = 300

func ExceptRaw(str string, limit, id int) string {
	if r := more.FindString(str); r != "" {
		m := strings.Split(str, r)
		str = m[0]
		return ""
	}
	content := removeWpBlock.ReplaceAllString(str, "")
	content = strings.Trim(content, " \t\n\r\000\x0B")
	content = strings.Replace(content, "]]>", "]]&gt;", -1)
	content = helper.StripTagsX(content, "<a><b><blockquote><br><cite><code><dd><del><div><dl><dt><em><h1><h2><h3><h4><h5><h6><i><img><li><ol><p><pre><span><strong><ul>")
	length := utf8.RuneCountInString(content) + 1
	if length > limit {
		start, l := 0, limit
		end := l
		ru := []rune(content)

		for {
			txt := string(ru[start:end])
			count := 0
			for _, ints := range tag.FindAllStringIndex(txt, -1) {
				t := txt[ints[0]:ints[1]]
				count += len(t)
				l += len(t)
			}
			if count > 0 && length > l {
				start = end
				end += count
			} else if count > 0 && length < l {
				break
			} else {
				content = string(ru[:end])
				closeTag := CloseHtmlTag(content)
				tmp := `%s......%s<p class="read-more"><a href="/p/%d">继续阅读</a></p>`
				if strings.Contains(closeTag, "pre") || strings.Contains(closeTag, "code") {
					tmp = `%s%s......<p class="read-more"><a href="/p/%d">继续阅读</a></p>`
				}
				content = fmt.Sprintf(tmp, content, closeTag, id)
				break
			}
		}
	}
	return content
}

func Except(p *Plugin[models.WpPosts], c *gin.Context, post *models.WpPosts, scene uint) {
	if scene == Detail {
		return
	}
	post.PostContent = ExceptRaw(post.PostContent, limit, int(post.Id))

}

var tagx = regexp.MustCompile(`(</?[a-z0-9]+?)( |>)`)
var tagAllow = regexp.MustCompile(`<(a|b|blockquote|cite|code|dd|del|div|dl|dt|em|h1|h2|h3|h4|h5|h6|i|li|ol|p|pre|span|strong|ul).*?>`)

func CloseHtmlTag(str string) string {
	tags := tagAllow.FindAllString(str, -1)
	if len(tags) < 1 {
		return str
	}
	var tagss = make([]string, 0, len(tags))
	for _, s := range tags {
		ss := strings.TrimSpace(tagx.FindString(s))
		if ss[len(ss)-1] != '>' {
			ss = fmt.Sprintf("%s>", ss)
		}
		tagss = append(tagss, ss)
	}
	r := helper.SliceMap[string, string](helper.ClearClosedTag(tagss), func(s string) string {
		return fmt.Sprintf("</%s>", strings.Trim(s, "<>"))
	})
	return strings.Join(r, "")
}