85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
package restaurants
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import (
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"errors"
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"golang.org/x/net/html"
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"golang.org/x/text/encoding/charmap"
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)
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func getAttribute(node *html.Node, key string) (string, error) {
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for _, attr := range node.Attr {
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if attr.Key == key {
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return attr.Val, nil
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}
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}
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return "", errors.New("couldn't find the provided key")
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}
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func hasKeyValue(node *html.Node, key string, value string) bool {
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if node.Type == html.ElementNode {
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attr, err := getAttribute(node, key)
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if err != nil {
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return false
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}
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return attr == value
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}
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return false
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}
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func findNodeBy(node *html.Node, key string, value string) (*html.Node, error) {
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if hasKeyValue(node, key, value) {
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return node, nil
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}
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for n := node.FirstChild; n != nil; n = n.NextSibling {
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res, err := findNodeBy(n, key, value)
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if err == nil {
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return res, nil
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}
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}
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return nil, errors.New("couldn't find a node with provided " + key + " \"" + value + "\"")
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}
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func findNodeByClass(node *html.Node, class string) (*html.Node, error) {
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return findNodeBy(node, "class", class)
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}
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func findNodeById(node *html.Node, id string) (*html.Node, error) {
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return findNodeBy(node, "id", id)
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}
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func getTextInternal(node *html.Node) (string, error) {
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if node.Type == html.TextNode {
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return node.Data, nil
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}
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return "", errors.New("not a text node")
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}
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func getText(node *html.Node) (string, error) {
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if node.Type == html.TextNode {
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return node.Data, nil
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}
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for n := node.FirstChild; n != nil; n = n.NextSibling {
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text, err := getTextInternal(n)
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if err == nil {
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return text, nil
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}
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}
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return "", errors.New("couldn't find a text node")
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}
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func getTextDecodeWindows1250(node *html.Node) (string, error) {
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text, err := getText(node)
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if err != nil {
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return text, err
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}
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return decodeWindows1250(text)
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}
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func decodeWindows1250(text string) (string, error) {
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dec := charmap.Windows1250.NewDecoder()
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out, err := dec.String(text)
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return out, err
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}
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