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// Package findlinks iterates over an HTML tree and extracts relevant
// data from it.
package findlinks
import (
"fmt"
"io"
"golang.org/x/net/html"
"golang.org/x/net/html/atom"
)
// A Link encapsulates the data harvested from a link.
type Link struct {
Href string
Text string
}
// findLinks consumes the given [io.Reader], scraping it of anchor
// tags. Each anchor tag is "unmarshalled" into a [Link]. The
// resulting slice of Links is returned, along with an error.
func FindLinks(r io.Reader) ([]Link, error) {
doc, err := html.Parse(r)
if err != nil {
return nil, fmt.Errorf("can't parse html reader: %w", err)
}
var links []Link
for n := range doc.Descendants() {
if n.Type == html.ElementNode && n.DataAtom == atom.A {
var link Link
// Scan the href.
for _, a := range n.Attr {
if a.Key == "href" {
link.Href = a.Val
}
}
// FIXME: for now, only scan for hrefs.
links = append(links, link)
}
}
return links, nil
}
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