/
htmltoh.go
177 lines (171 loc) · 3.48 KB
/
htmltoh.go
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package htmltoh
import (
"bytes"
"fmt"
"go/format"
"strconv"
"strings"
"golang.org/x/net/html"
)
func quoteText(buf *bytes.Buffer, text string) {
if strconv.CanBackquote(text) {
buf.WriteString("`")
buf.WriteString(text)
buf.WriteString("`")
return
}
buf.WriteString(strconv.Quote(text))
}
func HTMLToH(source string) (string, error) {
doc, err := html.Parse(strings.NewReader(source))
if err != nil {
return "", err
}
var buf bytes.Buffer
var outputNode func(n *html.Node, inTag bool)
outputNode = func(n *html.Node, inTag bool) {
walkChildren := func(inTag2 bool) {
for c := n.FirstChild; c != nil; c = c.NextSibling {
outputNode(c, inTag2)
}
}
writeTagNode := func() {
id := ""
classNames := ""
multiLine := func() bool {
if n.FirstChild == nil {
return false
}
if n.FirstChild.NextSibling != nil {
return true
}
if n.FirstChild.Type == html.TextNode {
return false
}
return true
}()
var attrs []html.Attribute
for _, attr := range n.Attr {
if attr.Key == "id" {
id = attr.Val
continue
}
if attr.Key == "class" {
classNames = attr.Val
continue
}
attrs = append(attrs, attr)
}
buf.WriteString(`h.H("`)
buf.WriteString(n.Data)
if id != "" {
buf.WriteString("#")
buf.WriteString(id)
}
if classNames != "" {
for _, cls := range strings.Split(classNames, " ") {
if cls == "" {
continue
}
buf.WriteString(".")
buf.WriteString(cls)
}
}
buf.WriteString("\",")
if multiLine {
buf.WriteString("\n")
}
if len(attrs) == 1 {
buf.WriteString("h.Attr(")
buf.WriteString(strconv.Quote(attrs[0].Key))
buf.WriteString(`, `)
buf.WriteString(strconv.Quote(attrs[0].Val))
buf.WriteString("),")
} else if len(attrs) > 1 {
buf.WriteString("h.Attrs{")
for i, attr := range attrs {
if i > 0 {
buf.WriteString(",")
}
buf.WriteString(`{`)
buf.WriteString(strconv.Quote(attr.Key))
buf.WriteString(`, `)
buf.WriteString(strconv.Quote(attr.Val))
buf.WriteString(`}`)
}
buf.WriteString("},")
if multiLine {
buf.WriteString("\n")
}
}
walkChildren(true)
buf.WriteString(")")
if inTag {
buf.WriteString(",\n")
}
}
switch n.Type {
case html.DocumentNode:
skipToBody := func() *html.Node {
htmlNode := n.FirstChild
if htmlNode == nil {
return nil
}
if len(htmlNode.Attr) > 0 {
return nil
}
if htmlNode.Data != "html" {
return nil
}
headNode := htmlNode.FirstChild
if headNode == nil {
return nil
}
if len(headNode.Attr) > 0 {
return nil
}
if headNode.FirstChild != nil {
return nil
}
if headNode.Data != "head" {
return nil
}
return headNode.NextSibling
}()
if skipToBody != nil {
n = skipToBody
}
walkChildren(false)
return
case html.DoctypeNode:
return
case html.CommentNode:
buf.WriteString("\n// ")
buf.WriteString(n.Data)
buf.WriteString("\n")
return
case html.ElementNode:
writeTagNode()
return
case html.TextNode:
text := strings.TrimSpace(n.Data)
if text == "" {
return
}
quoteText(&buf, text)
if inTag {
buf.WriteString(",\n")
}
return
default:
panic(fmt.Errorf("Unknown node: %+v", n))
}
}
outputNode(doc, false)
dst := buf.Bytes()
formatted, err := format.Source(dst)
if err != nil {
return string(dst), err
}
return string(formatted), nil
}