111 lines
3.2 KiB
Elixir
111 lines
3.2 KiB
Elixir
defmodule Readability.Helper do
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@moduledoc """
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Helpers for parsing, updating, removing html tree
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"""
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@type html_tree :: tuple | list
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@doc """
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Change existing tags by selector
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"""
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@spec change_tag(html_tree, String.t, String.t) :: html_tree
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def change_tag(content, _, _) when is_binary(content), do: content
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def change_tag([], _, _), do: []
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def change_tag([h|t], selector, tag) do
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[change_tag(h, selector, tag)|change_tag(t, selector, tag)]
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end
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def change_tag({tag_name, attrs, inner_tree}, tag_name, tag) do
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{tag, attrs, change_tag(inner_tree, tag_name, tag)}
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end
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def change_tag({tag_name, attrs, html_tree}, selector, tag) do
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{tag_name, attrs, change_tag(html_tree, selector, tag)}
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end
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@doc """
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Remove html attributes
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"""
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@spec remove_attrs(html_tree, String.t | [String.t] | Regex.t) :: html_tree
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def remove_attrs(content, _) when is_binary(content), do: content
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def remove_attrs([], _), do: []
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def remove_attrs([h|t], t_attrs) do
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[remove_attrs(h, t_attrs)|remove_attrs(t, t_attrs)]
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end
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def remove_attrs({tag_name, attrs, inner_tree}, target_attr) do
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reject_fun =
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cond do
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is_binary(target_attr) ->
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fn(attr) -> elem(attr, 0) == target_attr end
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Regex.regex?(target_attr) ->
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fn(attr) -> elem(attr, 0) =~ target_attr end
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is_list(target_attr) ->
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fn(attr) -> Enum.member?(target_attr, elem(attr, 0)) end
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true -> fn(attr) -> attr end
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end
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{tag_name, Enum.reject(attrs, reject_fun), remove_attrs(inner_tree, target_attr)}
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end
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@doc """
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Remove tags
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"""
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@spec remove_tag(html_tree, fun) :: html_tree
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def remove_tag(content, _) when is_binary(content), do: content
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def remove_tag([], _), do: []
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def remove_tag([h|t], fun) do
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node = remove_tag(h, fun)
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if is_nil(node) do
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remove_tag(t, fun)
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else
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[node|remove_tag(t, fun)]
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end
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end
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def remove_tag({tag, attrs, inner_tree} = html_tree, fun) do
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if fun.(html_tree) do
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nil
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else
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{tag, attrs, remove_tag(inner_tree, fun)}
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end
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end
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@doc """
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Count only text length
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"""
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@spec text_length(html_tree) :: number
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def text_length(html_tree) do
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html_tree |> Floki.text |> String.strip |> String.length
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end
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@doc """
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Check html_tree can be candidate or not.
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"""
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@spec candidate_tag?(html_tree) :: boolean
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def candidate_tag?(html_tree) do
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Enum.any?(candidates_selector(), fn(selector) ->
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Floki.Selector.match?(html_tree, selector)
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&& (text_length(html_tree)) >= Readability.default_options[:min_text_length]
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end)
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end
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@doc """
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Normalize and Parse to html tree(tuple or list)) from binary html
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"""
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@spec normalize(binary) :: html_tree
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def normalize(raw_html) do
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raw_html
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|> String.replace(Readability.regexes(:replace_xml_version), "")
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|> String.replace(Readability.regexes(:replace_brs), "</p><p>")
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|> String.replace(Readability.regexes(:replace_fonts), "<\1span>")
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|> String.replace(Readability.regexes(:normalize), " ")
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|> Floki.parse
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|> Floki.filter_out(:comment)
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end
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defp candidates_selector do
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["p", "td"]
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|> Enum.map(fn(s) ->
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tokens = Floki.SelectorTokenizer.tokenize(s)
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Floki.SelectorParser.parse(tokens)
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end)
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end
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end
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