/
main.go
90 lines (80 loc) · 1.88 KB
/
main.go
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package sandblast
import (
"bytes"
"fmt"
"golang.org/x/net/html"
"strings"
)
func extractEx(node *html.Node, flags Flags) (title, text string, simplified, flattened, cleaned *element, err error) {
root := findRoot(node)
if root == nil {
err = fmt.Errorf("Could not find root")
return
}
title = getTitle(root)
simplified, flattened, cleaned = extractTextEx(root, flags)
if cleaned == nil {
text = ""
} else {
text = cleaned.String(flags)
}
return
}
func ExtractEx(node *html.Node, flags Flags) (title, text string, simplified, flattened, cleaned *element, err error) {
title, text, simplified, flattened, cleaned, err = extractEx(node, flags)
return
}
func Extract(node *html.Node, flags Flags) (title, text string, err error) {
title, text, _, _, _, err = extractEx(node, flags|isDestructive)
return
}
func findRoot(node *html.Node) *html.Node {
if node == nil {
return nil
}
if node.Type == html.DocumentNode {
return findRoot(node.FirstChild)
}
for node != nil {
if (node.Type == html.ElementNode) && (strings.ToLower(node.Data) == "html") {
return node
}
node = node.NextSibling
}
return nil
}
func getTitle(root *html.Node) string {
head := findChild(root, "head")
title := findChild(head, "title")
if title == nil {
return ""
}
return strings.TrimSpace(findContent(title.FirstChild))
}
func findChild(root *html.Node, name string) *html.Node {
if root == nil {
return nil
}
name = strings.ToLower(name)
child := root.FirstChild
for child != nil {
if (child.Type == html.ElementNode) && (strings.ToLower(child.Data) == name) {
return child
}
child = child.NextSibling
}
return nil
}
func findContent(node *html.Node) string {
if node == nil {
return ""
}
out := bytes.NewBuffer([]byte{})
for node != nil {
if node.Type == html.TextNode {
out.Write([]byte(node.Data))
}
node = node.NextSibling
}
return string(out.Bytes())
}