$ go get -u golang.org/x/net/html
Source Code
html2rst.go |
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188 | package html2rst
import (
"bufio"
"fmt"
"golang.org/x/net/html"
"io"
"os"
"strings"
)
func StringToLines(s string) []string {
var lines []string
scanner := bufio.NewScanner(strings.NewReader(s))
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
if err := scanner.Err(); err != nil {
fmt.Fprintln(os.Stderr, "reading standard input:", err)
}
return lines
}
func indentEachLine(s string) string {
lines := StringToLines(s)
var indentedLines []string
for _, line := range lines {
indentedLines = append(indentedLines, " "+line)
}
return strings.Join(indentedLines, "\n")
}
func isAnchorElement(n *html.Node) bool {
return n.Type == html.ElementNode && n.Data == "a"
}
func isUlElement(n *html.Node) bool {
return n.Type == html.ElementNode && n.Data == "ul"
}
func isLiElement(n *html.Node) bool {
return n.Type == html.ElementNode && n.Data == "li"
}
func isScriptElement(n *html.Node) bool {
return n.Type == html.ElementNode && n.Data == "script"
}
func isImgElement(n *html.Node) bool {
return n.Type == html.ElementNode && n.Data == "img"
}
func isTextNode(n *html.Node) bool {
return n.Type == html.TextNode
}
func getAttribute(n *html.Node, key string) (string, bool) {
for _, attr := range n.Attr {
if attr.Key == key {
return attr.Val, true
}
}
return "", false
}
func textNode2rst(n *html.Node) string {
text := strings.TrimSpace(n.Data)
if text == "" {
return "\n"
}
return n.Data
}
func a2rst(n *html.Node) string {
if isImgElement(n.FirstChild) {
rstText := img2rst(n.FirstChild)
href, ok := getAttribute(n, "href")
if ok {
rstText += " :target: "
rstText += href
rstText += "\n"
}
return rstText
}
text := strings.TrimSpace(n.FirstChild.Data)
href, ok := getAttribute(n, "href")
if ok {
return "`" + text + " <" + href + ">`__"
}
return ""
}
func li2rst(n *html.Node) string {
rstText := ""
for c := n.FirstChild; c != nil; c = c.NextSibling {
if isTextNode(c) {
rstText += textNode2rst(c)
}
if isAnchorElement(c) {
rstText += a2rst(c)
}
if isUlElement(c) {
rstText += "\n"
rstText += indentEachLine(ul2rst(c))
}
}
return "- " + rstText + "\n"
}
func ul2rst(n *html.Node) string {
rstText := ""
for c := n.FirstChild; c != nil; c = c.NextSibling {
if isLiElement(c) {
rstText += li2rst(c)
}
}
return rstText
}
func img2rst(n *html.Node) string {
rstText := ".. image:: "
src, ok := getAttribute(n, "src")
if ok {
rstText += src
rstText += "\n"
} else {
rstText += "\n"
}
alt, ok := getAttribute(n, "alt")
if ok {
rstText += " :alt: "
rstText += alt
rstText += "\n"
}
class, ok := getAttribute(n, "class")
if ok {
if class == "align-center" {
rstText += " :align: center\n"
}
}
return rstText
}
func traverse(n *html.Node) string {
if isTextNode(n) {
return textNode2rst(n)
}
if isAnchorElement(n) {
return a2rst(n)
}
if isImgElement(n) {
return img2rst(n)
}
if isUlElement(n) {
return ul2rst(n)
}
if isScriptElement(n) {
return ""
}
rstText := ""
for c := n.FirstChild; c != nil; c = c.NextSibling {
rstText += traverse(c)
}
return rstText
}
func HtmlToRst(r io.Reader) string {
doc, err := html.Parse(r)
if err != nil {
panic("Fail to parse html")
}
return traverse(doc)
}
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html2rst_test.go |
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17 | package html2rst
import (
"net/http"
"testing"
)
func TestHtmlToRst(t *testing.T) {
//resp, err := http.Get("http://nanda.online-dhamma.net/")
resp, err := http.Get("https://siongui.github.io/zh/2016/03/14/pillow-useful-items-for-me-notes/")
if err != nil {
panic(err)
}
defer resp.Body.Close()
print(HtmlToRst(resp.Body))
}
|
Tested on: Ubuntu Linux 16.04, Go 1.6.2.
References: