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selector.go
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selector.go
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package main
import (
"errors"
"strconv"
"strings"
)
var errInvalidURL = errors.New("Invalid URL")
func makeCacheListRequest(url string) (*cacheListRequest, error) {
url = strings.Trim(url, "/")
if strings.ContainsRune(url, '/') {
return nil, errInvalidURL
}
cr := newCacheListRequest()
cr.header = url
return cr, nil
}
type selector string
func (sel selector) parseRange(cr *cacheRequest) error {
s := string(sel)
rangeParts := strings.SplitN(s, "-", 2)
if len(rangeParts) < 2 {
return errInvalidURL
}
var (
index int64
err error
)
index, err = strconv.ParseInt(rangeParts[0], 10, 32)
if err != nil {
return err
}
cr.index = int(index)
if cr.index < 0 {
return errInvalidURL
}
index, err = strconv.ParseInt(rangeParts[1], 10, 32)
if err != nil {
return err
}
if int(index) < cr.index {
return errInvalidURL
}
// Include last message in range
cr.limit = int(index) - cr.index + 1
if cr.limit < 0 {
return errInvalidURL
}
return nil
}
func (sel selector) parseIndex(cr *cacheRequest) error {
s := string(sel)
rangeParts := strings.SplitN(s, ",", 2)
if len(rangeParts) < 2 {
return errInvalidURL
}
var (
index, limit int64
err error
)
index, err = strconv.ParseInt(rangeParts[0], 10, 32)
if err != nil {
return err
}
cr.index = int(index)
if cr.index < 0 {
return errInvalidURL
}
limit, err = strconv.ParseInt(rangeParts[1], 10, 32)
if err != nil {
return err
}
cr.limit = int(limit)
if cr.limit < 0 {
return errInvalidURL
}
return nil
}
func (sel selector) parseNumber(cr *cacheRequest) error {
index, err := strconv.ParseInt(string(sel), 10, 32)
if err != nil {
return err
}
cr.index = int(index)
if index < 0 {
return errInvalidURL
}
return nil
}
func (sel selector) parse(cr *cacheRequest) error {
s := string(sel)
if strings.ContainsRune(s, '-') {
return sel.parseRange(cr)
}
if strings.ContainsRune(s, ',') {
return sel.parseIndex(cr)
}
return sel.parseNumber(cr)
}