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| package main | |
| import ( | |
| "bytes" | |
| "io" | |
| "log" | |
| "os" | |
| "golang.org/x/net/html" | |
| ) | |
| var sample = `<figure class="ja jb jc jd je jf cw cx paragraph-image"> <div role="button" tabindex="0" class="jg jh ji jj aj jk"> <div class="cw cx iz"> <div class="jq s ji jr"> <div class="js jt s"> <div class="jl jm t u v jn aj at jo jp"> <img alt="" class="t u v jn aj ju jv jw" src="https://miro.medium.com/max/60/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg?q=20" width="700" height="590" role="presentation" /> </div> <img alt="" class="jl jm t u v jn aj c" width="700" height="590" role="presentation" /><noscript><img alt="" class="t u v jn aj" src="https://miro.medium.com/max/1400/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg" width="700" height="590" srcSet="https://miro.medium.com/max/552/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 276w, https://miro.medium.com/max/1104/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 552w, https://miro.medium.com/max/1280/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 640w, https://miro.medium.com/max/1400/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 700w" sizes="700px" role="presentation" /></noscript> </div> </div> </div> </div> </figure>` | |
| func Example() { | |
| content := bytes.NewBufferString(sample) | |
| n, err := html.Parse(content) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| err = preProcess(n) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| html.Render(os.Stdout, n) | |
| // output: | |
| // <html><head></head><body><figure class="ja jb jc jd je jf cw cx paragraph-image"> <div role="button" tabindex="0" class="jg jh ji jj aj jk"> <div class="cw cx iz"> <div class="jq s ji jr"> <div class="js jt s"> <div class="jl jm t u v jn aj at jo jp"> </div> <img alt="" class="t u v jn aj" src="https://miro.medium.com/max/1400/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg" width="700" height="590" srcset="https://miro.medium.com/max/552/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 276w, https://miro.medium.com/max/1104/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 552w, https://miro.medium.com/max/1280/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 640w, https://miro.medium.com/max/1400/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 700w" sizes="700px" role="presentation"/><noscript><img alt="" class="t u v jn aj" src="https://miro.medium.com/max/1400/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg" width="700" height="590" srcSet="https://miro.medium.com/max/552/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 276w, https://miro.medium.com/max/1104/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 552w, https://miro.medium.com/max/1280/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 640w, https://miro.medium.com/max/1400/1*RSH2vh_xgQtjB68Zb7oBaA.jpeg 700w" sizes="700px" role="presentation" /></noscript> </div> </div> </div> </div> </figure></body></html> | |
| } | |
| func preProcess(n *html.Node) error { | |
| if n.Type == html.ElementNode && n.Data == "figure" { | |
| f := &figure{ | |
| images: make([]*html.Node, 0), | |
| } | |
| f.processFigure(n) | |
| // Clear all other images (medium, towarddatascience, ...) | |
| if len(f.images) > 1 { | |
| for _, img := range f.images { | |
| if img != f.validImage { | |
| img.Parent.RemoveChild(img) | |
| } | |
| } | |
| } | |
| } | |
| for c := n.FirstChild; c != nil; c = c.NextSibling { | |
| err := preProcess(c) | |
| if err != nil { | |
| return err | |
| } | |
| } | |
| return nil | |
| } | |
| type figure struct { | |
| images []*html.Node | |
| validImage *html.Node | |
| } | |
| func (f *figure) processFigure(n *html.Node) error { | |
| if n.Type == html.ElementNode && n.Data == "img" { | |
| f.images = append(f.images, n) | |
| } | |
| if n.Data == "noscript" { | |
| if originalImg := n.PrevSibling; originalImg.Data == "img" { | |
| // the img data is encoded as a string in the n.FirstChild.Data field | |
| // Let's parse it as a node: | |
| doc, err := html.Parse(bytes.NewBufferString(n.FirstChild.Data)) | |
| if err != nil { | |
| return err | |
| } | |
| img := getImgNode(doc) | |
| if img != nil { | |
| originalImg.Attr = img.Attr | |
| } | |
| f.validImage = originalImg | |
| } | |
| } | |
| for c := n.FirstChild; c != nil; c = c.NextSibling { | |
| err := f.processFigure(c) | |
| if err != io.EOF { | |
| return err | |
| } | |
| } | |
| return io.EOF | |
| } | |
| func getImgNode(node *html.Node) *html.Node { | |
| if node.Type == html.ElementNode && node.Data == "img" { | |
| return node | |
| } | |
| for child := node.FirstChild; child != nil; child = child.NextSibling { | |
| n := getImgNode(child) | |
| if n != nil { | |
| return n | |
| } | |
| } | |
| return nil | |
| } |
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