/
pages.go
55 lines (48 loc) · 1.02 KB
/
pages.go
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package mela
import (
"fmt"
"net/url"
"strings"
)
type Pages []PageRange
type PageRange []string
func ParsePages(pages string) (Pages, error) {
var pageRanges []PageRange
parts := strings.Split(pages, ",")
for _, prs := range parts {
ps := strings.Split(prs, "-")
if len(ps) > 2 {
return nil, fmt.Errorf("invalid page range: %s", prs)
}
pr := make(PageRange, len(ps))
var err error
for i, p := range ps {
if p == "" {
return nil, fmt.Errorf("invalid page number: %s", p)
}
if pr[i], err = url.QueryUnescape(p); err != nil {
return nil, fmt.Errorf("invalid URL encoding: %s", p)
}
}
pageRanges = append(pageRanges, pr)
}
return pageRanges, nil
}
func MustParsePages(str string) Pages {
p, err := ParsePages(str)
if err != nil {
panic(err)
}
return p
}
func (p Pages) String() string {
var parts []string
for _, pr := range p {
p := url.QueryEscape(pr[0])
if len(pr) > 1 {
p += "-" + url.QueryEscape(pr[1])
}
parts = append(parts, p)
}
return strings.Join(parts, ",")
}