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package dom
import (
"bytes"
"fmt"
"strings"
"golang.org/x/net/html"
)
func writePipeChar(buf *bytes.Buffer, index int) {
if index == 0 {
return
}
buf.WriteString(strings.Repeat("│ ", index-1))
buf.WriteString("├─")
}
func writeNode(buf *bytes.Buffer, node *html.Node) {
name := NodeName(node)
buf.WriteString(name)
if len(node.Attr) != 0 {
buf.WriteString(" (")
}
for i, attr := range node.Attr {
buf.WriteString(fmt.Sprintf("%s=%q", attr.Key, attr.Val))
if i < len(node.Attr)-1 {
buf.WriteString(" ")
}
}
if len(node.Attr) != 0 {
buf.WriteString(")")
}
if name == "#text" {
buf.WriteString(fmt.Sprintf(" %q", node.Data))
}
}
// RenderRepresentation is useful for debugging.
// It renders out the *structure* of the dom.
func RenderRepresentation(startNode *html.Node) string {
var buf bytes.Buffer
var finder func(*html.Node, int)
finder = func(node *html.Node, index int) {
writePipeChar(&buf, index)
writeNode(&buf, node)
buf.WriteRune('\n')
for child := node.FirstChild; child != nil; child = child.NextSibling {
finder(child, index+1)
}
}
if startNode.Parent == nil {
finder(startNode, 0)
} else {
finder(startNode, 1)
}
return strings.TrimSpace(buf.String())
}
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