89 lines
3.1 KiB
Elixir
89 lines
3.1 KiB
Elixir
defmodule Readability do
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@moduledoc """
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"""
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alias Readability.TitleFinder
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alias Readability.ArticleBuilder
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@default_options [retry_length: 250,
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min_text_length: 25,
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remove_unlikely_candidates: true,
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weight_classes: true,
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clean_conditionally: true,
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remove_empty_nodes: true,
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min_image_width: 130,
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min_image_height: 80,
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ignore_image_format: [],
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blacklist: nil,
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whitelist: nil
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]
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@regexes [unlikely_candidate: ~r/combx|comment|community|disqus|extra|foot|header|hidden|lightbox|modal|menu|meta|nav|remark|rss|shoutbox|sidebar|sponsor|ad-break|agegate|pagination|pager|popup/i,
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ok_maybe_its_a_candidate: ~r/and|article|body|column|main|shadow/i,
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positive: ~r/article|body|content|entry|hentry|main|page|pagination|post|text|blog|story/i,
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negative: ~r/hidden|^hid|combx|comment|com-|contact|foot|footer|footnote|link|masthead|media|meta|outbrain|promo|related|scroll|shoutbox|sidebar|sponsor|shopping|tags|tool|utility|widget/i,
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div_to_p_elements: ~r/<(a|blockquote|dl|div|img|ol|p|pre|table|ul)/i,
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replace_brs: ~r/(<br[^>]*>[ \n\r\t]*){2,}/i,
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replace_fonts: ~r/<(\/?)font[^>]*>/i,
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normalize: ~r/\s{2,}/,
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video: ~r/\/\/(www\.)?(dailymotion|youtube|youtube-nocookie|player\.vimeo)\.com/i
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]
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@type html_tree :: tuple | list
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@type options :: list
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def title(html) when is_binary(html), do: html |> parse |> title
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def title(html_tree), do: TitleFinder.title(html_tree)
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@doc """
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Using a variety of metrics (content score, classname, element types), find the content that is
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most likely to be the stuff a user wants to read
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"""
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@spec content(binary, options) :: binary
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def content(raw_html, opts \\ @default_options) do
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opts = Keyword.merge(@default_options, opts)
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raw_html
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|> parse
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|> ArticleBuilder.build(opts)
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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 parse(binary) :: html_tree
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def parse(raw_html) do
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raw_html
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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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@doc """
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return raw html binary from html tree tuple
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"""
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@spec raw_html(html_tree) :: binary
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def raw_html(html_tree) do
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html_tree |> Floki.raw_html
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end
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@doc """
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return only text binary from html tree tuple
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"""
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@spec raw_html(html_tree) :: binary
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def readabl_text(html_tree) do
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# TODO: Remove image caption when extract only text
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tags_to_br = ~r/<\/(p|div|article|h\d)/i
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html_str = html_tree |> raw_html
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Regex.replace(tags_to_br, html_str, &("\n#{&1}"))
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|> Floki.parse
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|> Floki.text
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|> String.strip
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end
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def regexes, do: @regexes
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def default_options, do: @default_options
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end
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