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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package htmlutils | ||
|
|
||
| import ( | ||
| "container/list" | ||
| "errors" | ||
| "fmt" | ||
|
|
||
| "golang.org/x/net/html" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrAttrNotFound = errors.New("matching attribute not found") | ||
| ) | ||
|
|
||
| func GetText(n *html.Node) string { | ||
| return n.FirstChild.Data | ||
| } | ||
|
|
||
| func GetAttr(n *html.Node, key string) (string, error) { | ||
| for _, attr := range n.Attr { | ||
| if attr.Key == key { | ||
| return attr.Val, nil | ||
| } | ||
| } | ||
|
|
||
| return "", ErrAttrNotFound | ||
| } | ||
|
|
||
| func CheckAttrMatch(n *html.Node, attrKey string, checkValue string) bool { | ||
| attrValue, err := GetAttr(n, attrKey) | ||
| return err == nil && attrValue == checkValue | ||
| } | ||
|
|
||
| func CheckID(n *html.Node, idValue string) bool { | ||
| return CheckAttrMatch(n, "id", idValue) | ||
| } | ||
|
|
||
| func CheckNodeType(n *html.Node, tagType string) bool { | ||
| return n.Type == html.ElementNode && n.Data == tagType | ||
| } | ||
|
|
||
| func GetFirstNodeByID(n *html.Node, idValue string) *html.Node { | ||
| return bfs(n, func(n *html.Node) bool { | ||
| return CheckID(n, idValue) | ||
| }) | ||
| } | ||
|
|
||
| func GetFirstNodeByType(n *html.Node, nodeType string) *html.Node { | ||
| return bfs(n, func(n *html.Node) bool { | ||
| return CheckNodeType(n, nodeType) | ||
| }) | ||
| } | ||
|
|
||
| func GetNodesByType(n *html.Node, nodeType string) []*html.Node { | ||
| nodes := []*html.Node{} | ||
| for childNode := n.FirstChild; childNode != nil; childNode = childNode.NextSibling { | ||
| if CheckNodeType(childNode, nodeType) { | ||
| nodes = append(nodes, childNode) | ||
| } | ||
| } | ||
| return nodes | ||
| } | ||
|
|
||
| // branching first search: returns the node matching the match function | ||
| // and nil if no node is found. | ||
| func bfs(rootNode *html.Node, | ||
| match func(node *html.Node) bool) (node *html.Node) { | ||
| visited := make(map[*html.Node]struct{}) | ||
| queue := list.New() | ||
| _ = queue.PushBack(rootNode) | ||
|
|
||
| for queue.Len() > 0 { | ||
| listElement := queue.Front() | ||
| node, ok := queue.Remove(listElement).(*html.Node) | ||
| if !ok { | ||
| panic(fmt.Sprintf("linked list has bad type %T", listElement.Value)) | ||
| } | ||
|
|
||
| if node == nil { | ||
| continue | ||
| } | ||
|
|
||
| if _, ok := visited[node]; ok { | ||
| continue | ||
| } | ||
| visited[node] = struct{}{} | ||
|
|
||
| if match(node) { | ||
| return node | ||
| } | ||
|
|
||
| for child := node.FirstChild; child != nil; child = child.NextSibling { | ||
| _ = queue.PushBack(child) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |