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program.go
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program.go
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package gemist
import (
"errors"
"io"
"net/http"
"strconv"
"strings"
"time"
"gopkg.in/xmlpath.v2"
)
// Program represents a program on Uitzending Gemist.
type Program struct {
MediaItem
bs []*BroadcastProxy
}
// GetProgram gets the page content from url, parses it and returns a Program.
func GetProgram(url string) (*Program, error) {
r, err := http.Get(url)
if err != nil {
return nil, err
}
return ParseProgram(r.Body)
}
// ParseProgram parses content of a reader into a Program.
func ParseProgram(r io.Reader) (*Program, error) {
n, err := xmlpath.ParseHTML(r)
if err != nil {
return nil, err
}
mi, err := parseMediaItem(n)
if err != nil {
return nil, err
}
// Get broadcast list node.
bs, err := parseProgramBroadcasts(n)
if err != nil {
return nil, err
}
p := Program{
MediaItem: mi,
bs: bs,
}
return &p, nil
}
var pPBData = xmlpath.MustCompile("//div[@id='broadcasts-block']/div[1]/div[1]")
func parseProgramBroadcasts(n *xmlpath.Node) ([]*BroadcastProxy, error) {
iter := pPBData.Iter(n)
iter.Next()
l := iter.Node()
bs, err := newBroadcastProxySlice(l)
if err != nil {
return nil, err
}
err = parseProgramList(l, &bs)
if err != nil {
return nil, err
}
return bs, nil
}
type BroadcastProxy struct {
MediaItem
SubTitle string
Date time.Time
Length time.Duration
}
var pPListNum = xmlpath.MustCompile("@data-num-found")
func newBroadcastProxySlice(n *xmlpath.Node) ([]*BroadcastProxy, error) {
snum, ok := pPListNum.String(n)
if !ok {
return nil, errors.New("gemist: error parsing program list length")
}
num, err := strconv.Atoi(snum)
if err != nil {
return nil, err
}
bps := make([]*BroadcastProxy, 0, num)
return bps, nil
}
var (
pPListItems = xmlpath.MustCompile("div")
)
func parseProgramList(n *xmlpath.Node, s *[]*BroadcastProxy) error {
iter := pPListItems.Iter(n)
var (
bps []*BroadcastProxy
err error
)
for iter.Next() {
bp, lerr := parseProgramListItem(iter.Node())
if lerr != nil {
break
}
bps = append(bps, bp)
}
if err != nil {
return err
}
for _, bp := range bps {
*s = append(*s, bp)
}
return nil
}
var (
pPListItemTitle = xmlpath.MustCompile("div[2]/a/h4/text()")
pPListItemDesc = xmlpath.MustCompile("div[2]/a/p/text()")
pPListItemImage = xmlpath.MustCompile("div[1]/div/a/img/@src")
pPListItemURL = xmlpath.MustCompile("div[1]/div/a/@href")
pPListItemInfo = xmlpath.MustCompile("div[2]/a/h5/text()")
pPListItemLen = xmlpath.MustCompile("div[1]/div/a/div/text()")
pListItemDateLoc, _ = time.LoadLocation("Europe/Amsterdam")
pListItemDateRep = strings.NewReplacer(
"Ma", "Mon",
"Di", "Tue",
"Wo", "Wed",
"Do", "Thu",
"Vr", "Fri",
"Za", "Sat",
"Zo", "Sun",
"jan", "Jan",
"feb", "Feb",
"mrt", "Mar",
"apr", "Apr",
"mei", "May",
"jun", "Jun",
"jul", "Jul",
"aug", "Aug",
"sep", "Sep",
"okt", "Oct",
"nov", "Nov",
"dec", "Dec",
)
)
const urlBase = "https://www.npo.nl"
const pListItemDateLayout = "Mon _2 Jan 2006 15:04"
func parseProgramListItem(n *xmlpath.Node) (*BroadcastProxy, error) {
title, ok := pPListItemTitle.String(n)
if !ok {
return nil, errors.New("gemist: error parsing program list title")
}
// No need to exist, no description is valid.
desc, _ := pPListItemDesc.String(n)
img, ok := pPListItemImage.String(n)
if !ok {
return nil, errors.New("gemist: error parsing program list image")
}
path, ok := pPListItemURL.String(n)
if !ok {
return nil, errors.New("gemist: error parsing program list url")
}
infostr, ok := pPListItemInfo.String(n)
if !ok {
return nil, errors.New("gemist: error parsing program list info")
}
info := strings.Split(infostr, " · ")
datestr := pListItemDateRep.Replace(info[1])
date, err := time.ParseInLocation(pListItemDateLayout, datestr, pListItemDateLoc)
if err != nil {
return nil, err
}
lenstr, ok := pPListItemLen.String(n)
if !ok {
return nil, errors.New("gemist: error parsing program list length")
}
len, err := parseBroadcastLength(lenstr)
if err != nil {
return nil, err
}
bp := BroadcastProxy{
MediaItem: MediaItem{
Title: strings.TrimSpace(title),
Description: desc,
ImageURLs: []string{img},
URL: urlBase + path,
},
SubTitle: info[0],
Date: date,
Length: len,
}
return &bp, nil
}