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webweav.ing
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Implement Parsing of Multiple Articles on one Page #5

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yequari merged 5 commits from multiple-articles-2 into master 2024-04-18 18:55:50 +00:00
Conversation 0 Commits 5 Files Changed 2 +129 -52
2 changed files with 129 additions and 52 deletions
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Showing only changes of commit 0546e9ec7e - Show all commits

111
feed/feed.go
View File

@ -1,6 +1,7 @@
package feed
import (
"errors"
"fmt"
"io"
"net/http"
@ -47,6 +48,13 @@ type FeedItem struct {
RawText string
}
type SitePage struct {
Url string
Title string
Root *html.Node
Errors []error
}
func fetchPage(url string) (string, error) {
resp, err := http.Get(url)
if err != nil {
@ -85,7 +93,7 @@ func parseTime(timestr string) (time.Time, error) {
return pagetime, err
}
}
return pagetime, fmt.Errorf("Error parsing time: invalid format")
return pagetime, fmt.Errorf("%s is in an invalid format", timestr)
}
func getHtmlElement(doc *html.Node, tag string) (*html.Node, error) {
@ -107,29 +115,36 @@ func getHtmlElement(doc *html.Node, tag string) (*html.Node, error) {
return element, nil
}
func (f *FeedItem) ParseContent(content string) error {
doc, err := html.Parse(strings.NewReader(content))
if err != nil {
return fmt.Errorf("Error parsing HTML: %w", err)
func getAllElements(doc *html.Node, tag string) ([]*html.Node, error) {
var f func(*html.Node, string)
elements := make([]*html.Node, 0)
f = func(n *html.Node, s string) {
if n.Type == html.ElementNode && n.Data == s{
elements = append(elements, n)
return
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
f(c, tag)
}
}
earticle, err := getHtmlElement(doc, "article")
if err != nil {
return err
}
etitle, err := getHtmlElement(doc, "title")
if err != nil {
f.Title = ""
} else {
f.Title = etitle.FirstChild.Data
f(doc, tag)
if len(elements) == 0 {
return nil, fmt.Errorf("no <%s> element found", tag)
}
return elements, nil
}
func NewFeedItem(url string, article *html.Node) (*FeedItem, error) {
var articleBuilder strings.Builder
html.Render(&articleBuilder, earticle)
f.RawText = articleBuilder.String()
html.Render(&articleBuilder, article)
item := FeedItem{
Url: url,
RawText: articleBuilder.String(),
}
etime, err := getHtmlElement(earticle, "time")
etime, err := getHtmlElement(article, "time")
if err != nil {
return err
return nil, err
}
var pubTime time.Time
for _, d := range etime.Attr {
@ -137,26 +152,58 @@ func (f *FeedItem) ParseContent(content string) error {
pubTime, err = parseTime(d.Val)
}
if err != nil {
return fmt.Errorf("Error parsing time: %w", err)
return nil, fmt.Errorf("Error parsing time: %w", err)
}
f.PubTime = pubTime
item.PubTime = pubTime
}
return nil
return &item, nil
}
func NewFeedItem(url string) (*FeedItem, error) {
func (p *SitePage) Parse() ([]*FeedItem, error) {
items := make([]*FeedItem, 0)
articles, err := getAllElements(p.Root, "article")
if err != nil {
return nil, errors.New("No article elements found")
}
for _, article := range articles {
item, parseErr := NewFeedItem(p.Url, article)
if parseErr != nil {
p.Errors = append(p.Errors, parseErr)
} else {
items = append(items, item)
}
}
if len(p.Errors) > 0 {
errorStrs := make([]string, 0)
for _, perr := range p.Errors {
errorStrs = append(errorStrs, perr.Error())
}
err = errors.New(strings.Join(errorStrs, "\n"))
}
return items, err
}
func NewSitePage(url string) (*SitePage, error) {
rawhtml, err := fetchPage(url)
if err != nil {
return nil, fmt.Errorf("Could not fetch page '%s': %w", url, err)
}
item := FeedItem{
Url: url,
}
err = item.ParseContent(rawhtml);
nodeRoot, err := html.Parse(strings.NewReader(rawhtml))
if err != nil {
return nil, fmt.Errorf("Could not parse feed item: %w", err)
return nil, fmt.Errorf("Error parsing HTML: %w", err)
}
return &item, nil
page := SitePage{
Url: url,
Root: nodeRoot,
Errors: make([]error, 0),
}
nodeTitle, err := getHtmlElement(nodeRoot, "title")
if err != nil {
page.Title = url
} else {
page.Title = nodeTitle.FirstChild.Data
}
return &page, nil
}
func NewFeedInfo(name, base_url, desc, author string, page_urls...string) (*FeedInfo, error) {
@ -168,11 +215,15 @@ func NewFeedInfo(name, base_url, desc, author string, page_urls...string) (*Feed
Errors: make(map[string]string, 10),
}
for _,url := range info.PageUrls {
item, err := NewFeedItem(url)
page, err := NewSitePage(url)
if err != nil {
info.Errors[url] = err.Error()
}
pageItems, err := page.Parse()
if err != nil {
info.Errors[url] = err.Error()
} else {
info.Items = append(info.Items, item)
info.Items = append(info.Items, pageItems...)
}
}
return &info, nil

70
feed/feed_test.go
View File

@ -1,9 +1,12 @@
package feed_test
import (
"testing"
"time"
"git.32bit.cafe/yequari/webweav.ing/feed"
"strings"
"testing"
"time"
"git.32bit.cafe/yequari/webweav.ing/feed"
"golang.org/x/net/html"
)
func TestTimeParsing(t *testing.T) {
@ -19,35 +22,38 @@ func TestTimeParsing(t *testing.T) {
}{
{
"YYYY-MM-DD",
`<html><head></head><body><article><time datetime="2004-05-14">May 14 2004</time>hello world</article></body></html>`,
`<article><time datetime="2004-05-14">May 14 2004</time>hello world</article>`,
time.DateOnly,
},
{
"YYYY-MM-DD HH:MM",
`<html><head></head><body><article><time datetime="2004-05-14 07:30">May 14 2004</time>hello world</article></body></html>`,
`<article><time datetime="2004-05-14 07:30">May 14 2004</time>hello world</article>`,
"2006-01-02 15:04",
},
{
"YYYY-MM-DD HH:MM:SS",
`<html><head></head><body><article><time datetime="2004-05-14 07:30:55">May 14 2004</time>hello world</article></body></html>`,
`<article><time datetime="2004-05-14 07:30:55">May 14 2004</time>hello world</article>`,
"2006-01-02 15:04:05",
},
{
"YYYY-MM-DDTHH:MM:SS",
`<html><head></head><body><article><time datetime="2004-05-14T07:30:55">May 14 2004</time>hello world</article></body></html>`,
`<article><time datetime="2004-05-14T07:30:55">May 14 2004</time>hello world</article>`,
"2006-01-02T15:04:05",
},
{
"YYYY-MM-DDTHH:MM",
`<html><head></head><body><article><time datetime="2004-05-14T07:30">May 14 2004</time>hello world</article></body></html>`,
`<article><time datetime="2004-05-14T07:30">May 14 2004</time>hello world</article>`,
"2006-01-02T15:04",
},
}
for _, tt := range tests {
t.Run(tt.name, func (t *testing.T) {
item := feed.FeedItem{}
err := item.ParseContent(tt.input)
html, err := html.Parse(strings.NewReader(tt.input))
if err != nil {
t.Errorf("error: %s", err)
}
item, err := feed.NewFeedItem("", html)
if err != nil {
t.Errorf("error: %s", err)
}
@ -61,38 +67,58 @@ func TestTimeParsing(t *testing.T) {
}
}
func TestParseFeedItem(t *testing.T) {
func TestArticleParsing(t *testing.T) {
testDate, err := time.Parse("2006-Jan-02", "2004-May-14")
if err != nil {
t.Errorf("creating test date failed: %s", err)
}
testDate2, err := time.Parse("2006-Jan-02", "2004-May-07")
if err != nil {
t.Errorf("creating test date failed: %s", err)
}
var tests = []struct {
name string
input string
want_time *time.Time
want_article string
want_time []*time.Time
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>",
&testDate,
"<article><time datetime=\"2004-05-14\">May 14 2004</time>hello world</article>",
[]*time.Time{&testDate},
[]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>",
[]*time.Time{&testDate, &testDate2},
[]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) {
item := feed.FeedItem{}
err := item.ParseContent(tt.input)
html, err := html.Parse(strings.NewReader(tt.input))
if err != nil {
t.Errorf("error: %s", err)
}
if item.RawText != tt.want_article {
t.Errorf("got %s, want %s", item.RawText, tt.want_article)
page := feed.SitePage{
Url: "",
Title: "",
Root: html,
Errors: make([]error, 0),
}
if tt.want_time != nil && !item.PubTime.Equal(*tt.want_time) {
t.Errorf("got %s, want %s", item.PubTime, *tt.want_time)
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[i] != nil && !item.PubTime.Equal(*tt.want_time[i]) {
t.Errorf("got %s, want %s", item.PubTime, *tt.want_time[i])
}
}
})
}