gopl-zh.github.com/vendor/gopl.io/ch5/outline/main.go

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2015-12-09 07:45:11 +00:00
// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
// See page 123.
// Outline prints the outline of an HTML document tree.
package main
import (
"fmt"
"os"
"golang.org/x/net/html"
)
//!+
func main() {
doc, err := html.Parse(os.Stdin)
if err != nil {
fmt.Fprintf(os.Stderr, "outline: %v\n", err)
os.Exit(1)
}
outline(nil, doc)
}
func outline(stack []string, n *html.Node) {
if n.Type == html.ElementNode {
stack = append(stack, n.Data) // push tag
fmt.Println(stack)
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
outline(stack, c)
}
}
//!-