/
5.7.go
82 lines (72 loc) · 1.4 KB
/
5.7.go
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package main
import (
"fmt"
"github.com/labstack/gommon/log"
"golang.org/x/net/html"
"net/http"
"os"
"strings"
)
func main() {
for _, url := range os.Args[1:] {
err := outline(url)
if err != nil {
log.Fatalf("error: %s", err)
}
}
}
func outline(url string) error {
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
doc, err := html.Parse(resp.Body)
if err != nil {
return err
}
fmt.Println(doc)
forEachNode(doc, startElement, endElement)
return nil
}
func forEachNode(n *html.Node, pre, post func(n *html.Node)) {
if pre != nil {
pre(n)
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
forEachNode(c, pre, post)
}
if post != nil {
post(n)
}
}
var depth int
func startElement(n *html.Node) {
if n.Type == html.ElementNode {
fmt.Printf("%*s<%s", depth*2, "", n.Data)
for _, a := range n.Attr {
fmt.Printf(" %s=%q", a.Key, a.Val)
}
if n.FirstChild != nil {
fmt.Printf(">\n")
} else {
fmt.Printf(" />\n")
}
depth++
} else if n.Type == html.TextNode {
trimmed := strings.TrimSpace(n.Data)
if trimmed != "" {
fmt.Printf("%*s%s\n", depth*2, "", trimmed)
}
} else if n.Type == html.CommentNode {
fmt.Printf("%*s<!--%s-->\n", depth*2, "", n.Data)
}
}
func endElement(n *html.Node) {
if n.Type == html.ElementNode {
depth--
if n.FirstChild != nil {
fmt.Printf("%*s</%s>\n", depth*2, "", n.Data)
}
}
}