Implement Parsing of Multiple Articles on one Page #5
163
feed/feed.go
163
feed/feed.go
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@ -1,13 +1,16 @@
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package feed
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import (
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"errors"
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"fmt"
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"io"
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"net/http"
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"path"
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"strings"
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"time"
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"golang.org/x/net/html"
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"golang.org/x/net/html/atom"
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)
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const feedfmtopen = `<?xml version="1.0" encoding="utf-8"?>
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@ -47,6 +50,14 @@ type FeedItem struct {
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RawText string
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}
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type SitePage struct {
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Url string
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Title string
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Root *html.Node
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Errors []error
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ErrStr string
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}
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func fetchPage(url string) (string, error) {
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resp, err := http.Get(url)
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if err != nil {
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@ -85,7 +96,7 @@ func parseTime(timestr string) (time.Time, error) {
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return pagetime, err
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}
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}
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return pagetime, fmt.Errorf("Error parsing time: invalid format")
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return pagetime, fmt.Errorf("%s is in an invalid format", timestr)
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}
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func getHtmlElement(doc *html.Node, tag string) (*html.Node, error) {
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@ -107,29 +118,72 @@ func getHtmlElement(doc *html.Node, tag string) (*html.Node, error) {
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return element, nil
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}
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func (f *FeedItem) ParseContent(content string) error {
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doc, err := html.Parse(strings.NewReader(content))
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if err != nil {
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return fmt.Errorf("Error parsing HTML: %w", err)
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func getAllElements(doc *html.Node, tag string) ([]*html.Node, error) {
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var f func(*html.Node, string)
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elements := make([]*html.Node, 0)
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f = func(n *html.Node, s string) {
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if n.Type == html.ElementNode && n.Data == s{
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elements = append(elements, n)
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return
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}
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earticle, err := getHtmlElement(doc, "article")
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if err != nil {
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return err
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for c := n.FirstChild; c != nil; c = c.NextSibling {
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f(c, tag)
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}
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etitle, err := getHtmlElement(doc, "title")
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if err != nil {
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f.Title = ""
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} else {
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f.Title = etitle.FirstChild.Data
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}
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f(doc, tag)
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if len(elements) == 0 {
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return nil, fmt.Errorf("no <%s> element found", tag)
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}
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return elements, nil
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}
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func getTitleAndUrl(article *html.Node) (string, string, error) {
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var title string
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var url string
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var header *html.Node
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h1s, _ := getAllElements(article, "h1")
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h2s, _ := getAllElements(article, "h2")
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h3s, _ := getAllElements(article, "h3")
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if len(h1s) > 0 {
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header = h1s[0]
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} else if len(h2s) > 0 {
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header = h2s[0]
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} else if len(h3s) > 0 {
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header = h3s[0]
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}
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if header == nil {
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return "", "", nil
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}
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if header.FirstChild.Type != html.ElementNode {
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title = header.FirstChild.Data
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} else if header.FirstChild.DataAtom == atom.A {
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title = header.FirstChild.FirstChild.Data
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for _, d := range header.FirstChild.Attr {
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if d.Key == "href" {
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url = d.Val
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}
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}
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}
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if url == "" && header.Parent.DataAtom == atom.A {
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for _, d := range header.FirstChild.Attr {
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if d.Key == "href" {
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url = d.Val
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}
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}
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}
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return title, url, nil
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}
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func NewFeedItem(url string, article *html.Node) (*FeedItem, error) {
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var articleBuilder strings.Builder
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html.Render(&articleBuilder, earticle)
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f.RawText = articleBuilder.String()
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etime, err := getHtmlElement(earticle, "time")
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html.Render(&articleBuilder, article)
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item := FeedItem{
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Url: url,
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RawText: articleBuilder.String(),
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}
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etime, err := getHtmlElement(article, "time")
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if err != nil {
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return err
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return nil, err
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}
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var pubTime time.Time
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for _, d := range etime.Attr {
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@ -137,26 +191,70 @@ func (f *FeedItem) ParseContent(content string) error {
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pubTime, err = parseTime(d.Val)
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}
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if err != nil {
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return fmt.Errorf("Error parsing time: %w", err)
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return nil, fmt.Errorf("Error parsing time: %w", err)
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}
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f.PubTime = pubTime
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item.PubTime = pubTime
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}
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return nil
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title, itemurl, _ := getTitleAndUrl(article)
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if title == "" {
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title = pubTime.Format("Jan 02 2006")
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}
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if itemurl == "" {
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itemurl = url
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}
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if itemurl != "" && !strings.HasPrefix(itemurl, "http://") && !strings.HasPrefix(itemurl, "https://") {
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itemurl = path.Join(url, itemurl)
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}
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item.Title = title
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item.Url = itemurl
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return &item, nil
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}
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func NewFeedItem(url string) (*FeedItem, error) {
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func (p *SitePage) Parse() ([]*FeedItem, error) {
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items := make([]*FeedItem, 0)
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articles, err := getAllElements(p.Root, "article")
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if err != nil {
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return nil, errors.New("No article elements found")
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}
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for _, article := range articles {
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item, parseErr := NewFeedItem(p.Url, article)
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if parseErr != nil {
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p.Errors = append(p.Errors, parseErr)
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} else {
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items = append(items, item)
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}
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}
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if len(p.Errors) > 0 {
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errorStrs := make([]string, 0)
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for _, perr := range p.Errors {
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errorStrs = append(errorStrs, perr.Error())
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}
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p.ErrStr = errors.New(strings.Join(errorStrs, "\n")).Error()
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}
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return items, nil
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}
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func NewSitePage(url string) (*SitePage, error) {
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rawhtml, err := fetchPage(url)
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if err != nil {
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return nil, fmt.Errorf("Could not fetch page '%s': %w", url, err)
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}
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item := FeedItem{
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Url: url,
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}
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err = item.ParseContent(rawhtml);
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nodeRoot, err := html.Parse(strings.NewReader(rawhtml))
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if err != nil {
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return nil, fmt.Errorf("Could not parse feed item: %w", err)
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return nil, fmt.Errorf("Error parsing HTML: %w", err)
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}
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return &item, nil
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page := SitePage{
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Url: url,
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Root: nodeRoot,
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Errors: make([]error, 0),
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}
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nodeTitle, err := getHtmlElement(nodeRoot, "title")
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if err != nil {
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page.Title = url
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} else {
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page.Title = nodeTitle.FirstChild.Data
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}
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return &page, nil
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}
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func NewFeedInfo(name, base_url, desc, author string, page_urls...string) (*FeedInfo, error) {
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@ -168,11 +266,16 @@ func NewFeedInfo(name, base_url, desc, author string, page_urls...string) (*Feed
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Errors: make(map[string]string, 10),
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}
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for _,url := range info.PageUrls {
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item, err := NewFeedItem(url)
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page, err := NewSitePage(url)
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if err != nil {
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info.Errors[url] = err.Error()
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}
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pageItems, err := page.Parse()
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if err != nil {
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info.Errors[url] = err.Error()
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} else {
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info.Items = append(info.Items, item)
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info.Items = append(info.Items, pageItems...)
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info.Errors[url] = page.ErrStr
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}
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}
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return &info, nil
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@ -1,12 +1,15 @@
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package feed_test
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import (
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"strings"
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"testing"
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"time"
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"git.32bit.cafe/yequari/webweav.ing/feed"
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"golang.org/x/net/html"
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)
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func TestTimeParsing(t *testing.T) {
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func TestTimeParsingFormat(t *testing.T) {
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testDate, err := time.Parse("2006-Jan-02 15:04:05 -7", "2004-May-14 07:30:55 -7")
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if err != nil {
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t.Errorf("creating test date failed: %s", err)
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@ -19,35 +22,38 @@ func TestTimeParsing(t *testing.T) {
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}{
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{
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"YYYY-MM-DD",
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`<html><head></head><body><article><time datetime="2004-05-14">May 14 2004</time>hello world</article></body></html>`,
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`<article><time datetime="2004-05-14">May 14 2004</time>hello world</article>`,
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time.DateOnly,
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},
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{
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"YYYY-MM-DD HH:MM",
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`<html><head></head><body><article><time datetime="2004-05-14 07:30">May 14 2004</time>hello world</article></body></html>`,
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`<article><time datetime="2004-05-14 07:30">May 14 2004</time>hello world</article>`,
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"2006-01-02 15:04",
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},
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{
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"YYYY-MM-DD HH:MM:SS",
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`<html><head></head><body><article><time datetime="2004-05-14 07:30:55">May 14 2004</time>hello world</article></body></html>`,
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`<article><time datetime="2004-05-14 07:30:55">May 14 2004</time>hello world</article>`,
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"2006-01-02 15:04:05",
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},
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{
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"YYYY-MM-DDTHH:MM:SS",
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`<html><head></head><body><article><time datetime="2004-05-14T07:30:55">May 14 2004</time>hello world</article></body></html>`,
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`<article><time datetime="2004-05-14T07:30:55">May 14 2004</time>hello world</article>`,
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"2006-01-02T15:04:05",
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},
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{
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"YYYY-MM-DDTHH:MM",
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`<html><head></head><body><article><time datetime="2004-05-14T07:30">May 14 2004</time>hello world</article></body></html>`,
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`<article><time datetime="2004-05-14T07:30">May 14 2004</time>hello world</article>`,
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"2006-01-02T15:04",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func (t *testing.T) {
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item := feed.FeedItem{}
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err := item.ParseContent(tt.input)
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html, err := html.Parse(strings.NewReader(tt.input))
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if err != nil {
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t.Errorf("error: %s", err)
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}
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item, err := feed.NewFeedItem("", html)
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if err != nil {
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t.Errorf("error: %s", err)
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}
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@ -61,38 +67,231 @@ func TestTimeParsing(t *testing.T) {
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}
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}
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func TestParseFeedItem(t *testing.T) {
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func TestArticleTimeParsing(t *testing.T) {
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testDate, err := time.Parse("2006-Jan-02", "2004-May-14")
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if err != nil {
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t.Errorf("creating test date failed: %s", err)
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}
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testDate2, err := time.Parse("2006-Jan-02", "2004-May-07")
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if err != nil {
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t.Errorf("creating test date failed: %s", err)
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}
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var tests = []struct {
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name string
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input string
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want_time *time.Time
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want_article string
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want_time []*time.Time
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}{
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{
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"article and time stripped out of basic HTML",
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"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article></body></html>",
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&testDate,
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"<article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article>",
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[]*time.Time{&testDate},
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},
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{
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"multiple articles",
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"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article><article><time datetime=\"2004-05-07\">May 7 2004</time>this is a second article</article></body></html>",
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[]*time.Time{&testDate, &testDate2},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func (t *testing.T) {
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item := feed.FeedItem{}
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err := item.ParseContent(tt.input)
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html, err := html.Parse(strings.NewReader(tt.input))
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if err != nil {
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t.Errorf("error: %s", err)
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}
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if item.RawText != tt.want_article {
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t.Errorf("got %s, want %s", item.RawText, tt.want_article)
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page := feed.SitePage{
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Url: "",
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Title: "",
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Root: html,
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Errors: make([]error, 0),
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}
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items, err := page.Parse()
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if err != nil {
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t.Errorf("error: %s", err)
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}
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for i, item := range items {
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if tt.want_time[i] != nil && !item.PubTime.Equal(*tt.want_time[i]) {
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t.Errorf("got %s, want %s", item.PubTime, *tt.want_time[i])
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}
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}
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})
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}
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}
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func TestArticleUrls(t *testing.T) {
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var tests = []struct {
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name string
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input string
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want_url []string
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}{
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{
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"article without url",
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"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article></body></html>",
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[]string{""},
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},
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{
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"one article with one url",
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"<html><head></head><body><article><h1><a href=\"https://example.com\">Title</a></h1><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article></body></html>",
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[]string{"https://example.com"},
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},
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{
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"multiple articles",
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"<html><head></head><body><article><h1><a href=\"https://example.com/example1\">Title</a></h1><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article><article><h1><a href=\"https://example.com/example2\">Title</a></h1><time datetime=\"2004-05-07\">May 7 2004</time>this is a second article</article></body></html>",
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[]string{"https://example.com/example1", "https://example.com/example2"},
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},
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{
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"one article with multiple urls",
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"<html><head></head><body><article><h1><a href=\"https://example.com\">Title</a></h1><time datetime=\"2004-05-14\">May 14 2004</time><a href=\"https://google.com\">click me</a><p>hello world</p></article></body></html>",
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[]string{"https://example.com"},
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},
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{
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"one article with multiple h1 urls",
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"<html><head></head><body><article><h1><a href=\"https://example.com\">Title</a></h1><time datetime=\"2004-05-14\">May 14 2004</time><h1><a href=\"https://google.com\">click me</a></h1><p>hello world</p></article></body></html>",
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[]string{"https://example.com"},
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},
|
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}
|
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|
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for _, tt := range tests {
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t.Run(tt.name, func (t *testing.T) {
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html, err := html.Parse(strings.NewReader(tt.input))
|
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if err != nil {
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t.Errorf("error: %s", err)
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}
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page := feed.SitePage{
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Url: "",
|
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Title: "",
|
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Root: html,
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Errors: make([]error, 0),
|
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}
|
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items, err := page.Parse()
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if err != nil {
|
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t.Errorf("error: %s", err)
|
||||
}
|
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for i, item := range items {
|
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if item.Url != tt.want_url[i] {
|
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t.Errorf("got %s, want %s", item.Url, tt.want_url[i])
|
||||
}
|
||||
}
|
||||
})
|
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}
|
||||
}
|
||||
|
||||
func TestArticleTitles(t *testing.T) {
|
||||
var tests = []struct {
|
||||
name string
|
||||
input string
|
||||
want_title []string
|
||||
}{
|
||||
{
|
||||
"article and time stripped out of basic HTML",
|
||||
"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article></body></html>",
|
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[]string{"May 14 2004"},
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},
|
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{
|
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"multiple articles",
|
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"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article><article><time datetime=\"2004-05-07\">May 7 2004</time>this is a second article</article></body></html>",
|
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[]string{"May 14 2004", "May 07 2004"},
|
||||
},
|
||||
{
|
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"multiple articles with h1",
|
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"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time><h1>Hello</h1>hello world</article><article><time datetime=\"2004-05-07\"><h1>World</h1>May 7 2004</time>this is a second article</article></body></html>",
|
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[]string{"Hello", "World"},
|
||||
},
|
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{
|
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"article with h1",
|
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"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time><h1>Hello</h1>hello world</article></body></html>",
|
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[]string{"Hello"},
|
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},
|
||||
{
|
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"article with h2",
|
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"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time><h2>Hello</h2>hello world</article></body></html>",
|
||||
[]string{"Hello"},
|
||||
},
|
||||
{
|
||||
"article with h3",
|
||||
"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time><h3>Hello</h3>hello world</article></body></html>",
|
||||
[]string{"Hello"},
|
||||
},
|
||||
{
|
||||
"article with h1 and h2",
|
||||
"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time><h1>Hello</h1><h2>World</h2>hello world</article></body></html>",
|
||||
[]string{"Hello"},
|
||||
},
|
||||
{
|
||||
"article with h2 and h3",
|
||||
"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time><h3>Hello</h3><h2>World</h2>hello world</article></body></html>",
|
||||
[]string{"World"},
|
||||
},
|
||||
{
|
||||
"article with multiple h1",
|
||||
"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time><h1>Hello</h1><h1>World</h1>hello world</article></body></html>",
|
||||
[]string{"Hello"},
|
||||
},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func (t *testing.T) {
|
||||
html, err := html.Parse(strings.NewReader(tt.input))
|
||||
if err != nil {
|
||||
t.Errorf("error: %s", err)
|
||||
}
|
||||
page := feed.SitePage{
|
||||
Url: "",
|
||||
Title: "",
|
||||
Root: html,
|
||||
Errors: make([]error, 0),
|
||||
}
|
||||
items, err := page.Parse()
|
||||
if err != nil {
|
||||
t.Errorf("error: %s", err)
|
||||
}
|
||||
for i, item := range items {
|
||||
if item.Title != tt.want_title[i] {
|
||||
t.Errorf("got %s, want %s", item.Title, tt.want_title[i])
|
||||
}
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestArticleParsing(t *testing.T) {
|
||||
var tests = []struct {
|
||||
name string
|
||||
input string
|
||||
want_article []string
|
||||
}{
|
||||
{
|
||||
"article and time stripped out of basic HTML",
|
||||
"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article></body></html>",
|
||||
[]string{"<article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article>"},
|
||||
},
|
||||
{
|
||||
"multiple articles",
|
||||
"<html><head></head><body><article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article><article><time datetime=\"2004-05-07\">May 7 2004</time>this is a second article</article></body></html>",
|
||||
[]string{"<article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article>", "<article><time datetime=\"2004-05-07\">May 7 2004</time>this is a second article</article>"},
|
||||
},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func (t *testing.T) {
|
||||
html, err := html.Parse(strings.NewReader(tt.input))
|
||||
if err != nil {
|
||||
t.Errorf("error: %s", err)
|
||||
}
|
||||
page := feed.SitePage{
|
||||
Url: "",
|
||||
Title: "",
|
||||
Root: html,
|
||||
Errors: make([]error, 0),
|
||||
}
|
||||
items, err := page.Parse()
|
||||
if err != nil {
|
||||
t.Errorf("error: %s", err)
|
||||
}
|
||||
for i, item := range items {
|
||||
if item.RawText != tt.want_article[i] {
|
||||
t.Errorf("got %s, want %s", item.RawText, tt.want_article[i])
|
||||
}
|
||||
if tt.want_time != nil && !item.PubTime.Equal(*tt.want_time) {
|
||||
t.Errorf("got %s, want %s", item.PubTime, *tt.want_time)
|
||||
}
|
||||
})
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue