parser

var ByToken = Func(func(body []byte) (Results, error) {
	tokenizer := html.NewTokenizer(bytes.NewReader(body))
	results := Results{}
	for {
		tokenType := tokenizer.Next()
		switch tokenType {

		case html.ErrorToken:
			err := tokenizer.Err()
			if err == io.EOF {
				return results, nil
			}
			return results, err

		case html.StartTagToken:
			token := tokenizer.Token()

			if isTag(token, TagA) {
				href := filterAttrByName(token, AttrHref)
				if href == nil {
					continue
				}
				uri, err := url.Parse(*href)
				if err != nil {
					continue
				}
				results.Links = append(results.Links, uri)
				continue
			}

			if isTag(token, TagImg) || isTag(token, TagScript) {
				src := filterAttrByName(token, AttrSrc)
				if src == nil {
					continue
				}
				results.Assets = append(results.Assets, *src)
			}

			if isTag(token, TagLink) {
				href := filterAttrByName(token, AttrHref)
				if href == nil {
					continue
				}
				results.Assets = append(results.Assets, *href)
				continue
			}

		}
	}
})