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