|
- defmodule Microformats2.Rels do
- import Microformats2.Helpers
-
- def parse(doc, base_url) do
- link_rels =
- Floki.find(doc, "[rel][href]")
- |> Enum.filter(fn element ->
- rel = Floki.attribute(element, "rel") |> List.first()
- href = Floki.attribute(element, "href") |> List.first()
-
- String.trim(to_string(rel)) != "" and String.trim(to_string(href)) != ""
- end)
- |> Enum.reduce(%{rels: %{}, rel_urls: %{}}, fn element, acc ->
- rel = attr_list(element, "rel")
- url = Floki.attribute(element, "href") |> List.first() |> abs_uri(base_url, doc)
-
- acc
- |> save_urls_by_rels(rel, url)
- |> save_rels_by_urls(rel, url)
- |> save_attributes(element, url)
- end)
-
- link_rels
- end
-
- defp save_urls_by_rels(map, rel, url) do
- Enum.reduce(rel, map, fn rel, nmap ->
- if nmap[:rels][rel] == nil,
- do: put_in(nmap, [:rels, rel], [url]),
- else: put_in(nmap, [:rels, rel], Enum.uniq(nmap[:rels][rel] ++ [url]))
- end)
- end
-
- defp save_rels_by_urls(map, rel, url) do
- if map[:rel_urls][url] == nil,
- do: put_in(map, [:rel_urls, url], %{rels: rel}),
- else: put_in(map, [:rel_urls, url, :rels], Enum.uniq(map[:rel_urls][url][:rels] ++ rel))
- end
-
- defp save_text(map, element, url) do
- text = Floki.text(element)
-
- if String.trim(to_string(text)) == "" or map[:rel_urls][url][:text] != nil,
- do: map,
- else: put_in(map, [:rel_urls, url, :text], text)
- end
-
- defp save_attributes(map, element, url) do
- Enum.reduce(["hreflang", "media", "title", "type"], save_text(map, element, url), fn att, nmap ->
- val = Floki.attribute(element, att) |> List.first()
- key = String.to_atom(att)
-
- if String.trim(to_string(val)) == "" or nmap[:rel_urls][url][key] != nil,
- do: nmap,
- else: put_in(nmap, [:rel_urls, url, key], val)
- end)
- end
- end
|