94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
package pagination
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import (
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"math"
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"strings"
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)
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type Elements interface {
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Current(page int) string
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Prev(url string) string
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Next(url string) string
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Dots() string
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Middle(page int, url string) string
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Url(path, query string, page int) string
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}
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type ParsePagination struct {
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Elements
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TotalPage int
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TotalRaw int
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PageSize int
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CurrentPage int
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Query string
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Path string
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Step int
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}
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func NewParsePagination(totalRaw int, pageSize int, currentPage, step int, query string, path string) ParsePagination {
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allPage := int(math.Ceil(float64(totalRaw) / float64(pageSize)))
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return ParsePagination{TotalPage: allPage, TotalRaw: totalRaw, PageSize: pageSize, CurrentPage: currentPage, Query: query, Path: path, Step: step}
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}
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func Paginate(e Elements, p ParsePagination) string {
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p.Elements = e
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return p.ToHtml()
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}
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func (p ParsePagination) ToHtml() (html string) {
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if p.TotalRaw < 2 {
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return
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}
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s := strings.Builder{}
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if p.CurrentPage > p.TotalPage {
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p.CurrentPage = p.TotalPage
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}
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start := p.CurrentPage - p.Step
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end := p.CurrentPage + p.Step
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if start < 1 {
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start = 1
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}
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if p.CurrentPage > 1 {
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s.WriteString(p.Prev(p.Url(p.Path, p.Query, p.CurrentPage-1)))
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}
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if p.CurrentPage >= p.Step+2 {
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d := false
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if p.CurrentPage > p.Step+2 {
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d = true
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}
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s.WriteString(p.Middle(1, p.Url(p.Path, p.Query, 1)))
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if d {
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s.WriteString(p.Dots())
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}
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}
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if p.TotalPage < end {
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end = p.TotalPage
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}
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for page := start; page <= end; page++ {
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h := ""
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if p.CurrentPage == page {
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h = p.Current(page)
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} else {
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h = p.Middle(page, p.Url(p.Path, p.Query, page))
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}
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s.WriteString(h)
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}
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if p.TotalPage >= p.CurrentPage+p.Step+1 {
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d := false
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if p.TotalPage > p.CurrentPage+p.Step+1 {
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d = true
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}
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if d {
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s.WriteString(p.Dots())
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}
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s.WriteString(p.Middle(p.TotalPage, p.Url(p.Path, p.Query, p.TotalPage)))
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}
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if p.CurrentPage < p.TotalPage {
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s.WriteString(p.Next(p.Url(p.Path, p.Query, p.CurrentPage+1)))
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}
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html = s.String()
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return
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}
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