lib: move package "net/html" to "lib/html"

Putting "html" under "net" package make no sense.
Another reason is to make the package flat under "lib/" directory.

1 files changed, 75 insertions, 0 deletions

diff --git a/lib/html/node.go b/lib/html/node.go
new file mode 100644
index 00000000..ac00ac48
--- /dev/null
+++ b/lib/html/node.go
@@ -0,0 +1,75 @@
+// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+import (
+	"strings"
+
+	"golang.org/x/net/html"
+)
+
+// Node extends the html.Node.
+type Node struct {
+	*html.Node
+}
+
+// NewNode create new node by embedding html.Node "el".
+func NewNode(el *html.Node) *Node {
+	return &Node{Node: el}
+}
+
+// GetAttrValue get the value of node's attribute with specific key or empty
+// if key not found.
+func (node *Node) GetAttrValue(key string) string {
+	for _, attr := range node.Attr {
+		if key == attr.Key {
+			return attr.Val
+		}
+	}
+	return ""
+}
+
+// GetFirstChild get the first non-empty child of node or nil if no child
+// left.
+func (node *Node) GetFirstChild() *Node {
+	el := node.FirstChild
+	for el != nil {
+		if el.Type == html.TextNode {
+			if len(strings.TrimSpace(el.Data)) == 0 {
+				el = el.NextSibling
+				continue
+			}
+		}
+		break
+	}
+	if el == nil {
+		return nil
+	}
+	return NewNode(el)
+}
+
+// GetNextSibling get the next non-empty sibling of node or nil if no more
+// sibling left.
+func (node *Node) GetNextSibling() *Node {
+	el := node.NextSibling
+	for el != nil {
+		if el.Type == html.TextNode {
+			if len(strings.TrimSpace(el.Data)) == 0 {
+				el = el.NextSibling
+				continue
+			}
+		}
+		break
+	}
+	if el == nil {
+		return nil
+	}
+	return NewNode(el)
+}
+
+// IsElement will return true if node type is html.ElementNode.
+func (node *Node) IsElement() bool {
+	return node.Type == html.ElementNode
+}