defmodule AutoLinker.Parser do @moduledoc """ Module to handle parsing the the input string. """ alias AutoLinker.Builder @doc """ Parse the given string, identifying items to link. Parses the string, replacing the matching urls and phone numbers with an html link. ## Examples iex> AutoLinker.Parser.parse("Check out google.com") ~s{Check out google.com} iex> AutoLinker.Parser.parse("call me at x9999", phone: true) ~s{call me at x9999} iex> AutoLinker.Parser.parse("or at home on 555.555.5555", phone: true) ~s{or at home on 555.555.5555} iex> AutoLinker.Parser.parse(", work (555) 555-5555", phone: true) ~s{, work (555) 555-5555} """ # @invalid_url ~r/\.\.+/ @invalid_url ~r/(\.\.+)|(^(\d+\.){1,2}\d+$)/ @match_url ~r{^[\w\.-]+(?:\.[\w\.-]+)+[\w\-\._~%:/?#[\]@!\$&'\(\)\*\+,;=.]+$} @match_scheme ~r{^(?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~%:/?#[\]@!\$&'\(\)\*\+,;=.]+$} @match_phone ~r"((?:x\d{2,7})|(?:(?:\+?1\s?(?:[.-]\s?)?)?(?:\(\s?(?:[2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9])\s?\)|(?:[2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\s?(?:[.-]\s?)?)(?:[2-9]1[02-9]|[2-9][02-9]1|[2-9][02-9]{2})\s?(?:[.-]\s?)?(?:[0-9]{4}))" @match_hostname ~r{^(?:https?:\/\/)?(?:[^@\n]+\\w@)?(?[^:#~\/\n?]+)} @match_ip ~r"^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$" # @user # @user@example.com @match_mention ~r/^@[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@?[a-zA-Z0-9_-](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*/u # https://www.w3.org/TR/html5/forms.html#valid-e-mail-address @match_email ~r/^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/u @match_hashtag ~r/^(?\#\w+)/u @prefix_extra [ "magnet:?", "dweb://", "dat://", "gopher://", "ipfs://", "ipns://", "irc://", "ircs://", "irc6://", "mumble://", "ssb://" ] @tlds "./priv/tlds.txt" |> File.read!() |> String.split("\n", trim: true) @default_opts ~w(url)a def parse(input, opts \\ %{}) def parse(input, opts) when is_binary(input), do: {input, nil} |> parse(opts) |> elem(0) def parse(input, list) when is_list(list), do: parse(input, Enum.into(list, %{})) def parse(input, opts) do config = :auto_linker |> Application.get_env(:opts, []) |> Enum.into(%{}) |> Map.put( :attributes, Application.get_env(:auto_linker, :attributes, []) ) opts = Enum.reduce(@default_opts, opts, fn opt, acc -> if is_nil(opts[opt]) and is_nil(config[opt]) do Map.put(acc, opt, true) else acc end end) do_parse(input, Map.merge(config, opts)) end defp do_parse(input, %{phone: false} = opts), do: do_parse(input, Map.delete(opts, :phone)) defp do_parse(input, %{url: false} = opts), do: do_parse(input, Map.delete(opts, :url)) defp do_parse(input, %{phone: _} = opts) do input |> do_parse(opts, {"", "", :parsing}, &check_and_link_phone/3) |> do_parse(Map.delete(opts, :phone)) end defp do_parse(input, %{mention: true} = opts) do input |> do_parse(opts, {"", "", :parsing}, &check_and_link_mention/3) |> do_parse(Map.delete(opts, :mention)) end defp do_parse(input, %{extra: true} = opts) do input |> do_parse(opts, {"", "", :parsing}, &check_and_link_extra/3) |> do_parse(Map.delete(opts, :extra)) end defp do_parse({text, user_acc}, %{markdown: true} = opts) do text |> Builder.create_markdown_links(opts) |> (&{&1, user_acc}).() |> do_parse(Map.delete(opts, :markdown)) end defp do_parse(input, %{email: true} = opts) do input |> do_parse(opts, {"", "", :parsing}, &check_and_link_email/3) |> do_parse(Map.delete(opts, :email)) end defp do_parse({text, user_acc}, %{url: _} = opts) do input = with exclude <- Map.get(opts, :exclude_patterns), true <- is_list(exclude), true <- String.starts_with?(text, exclude) do {text, user_acc} else _ -> do_parse( {text, user_acc}, opts, {"", "", :parsing}, &check_and_link/3 ) end do_parse(input, Map.delete(opts, :url)) end defp do_parse(input, %{hashtag: true} = opts) do input |> do_parse(opts, {"", "", :parsing}, &check_and_link_hashtag/3) |> do_parse(Map.delete(opts, :hashtag)) end defp do_parse(input, _), do: input defp do_parse({"", user_acc}, _opts, {"", acc, _}, _handler), do: {acc, user_acc} defp do_parse({"", user_acc}, opts, {buffer, acc, _}, handler) do {buffer, user_acc} = run_handler(handler, buffer, opts, user_acc) {acc <> buffer, user_acc} end defp do_parse({" text, user_acc}, opts, {buffer, acc, :parsing}, handler), do: do_parse({text, user_acc}, opts, {"", acc <> buffer <> "" <> text, user_acc}, opts, {buffer, acc, :skip}, handler), do: do_parse({text, user_acc}, opts, {"", acc <> buffer <> "", :parsing}, handler) defp do_parse({"<" <> text, user_acc}, opts, {"", acc, :parsing}, handler), do: do_parse({text, user_acc}, opts, {"<", acc, {:open, 1}}, handler) defp do_parse({">" <> text, user_acc}, opts, {buffer, acc, {:attrs, level}}, handler), do: do_parse( {text, user_acc}, opts, {"", acc <> buffer <> ">", {:html, level}}, handler ) defp do_parse({<> <> text, user_acc}, opts, {"", acc, {:attrs, level}}, handler) do do_parse({text, user_acc}, opts, {"", acc <> <>, {:attrs, level}}, handler) end defp do_parse({" text, user_acc}, opts, {buffer, acc, {:html, level}}, handler) do {buffer, user_acc} = run_handler(handler, buffer, opts, user_acc) do_parse( {text, user_acc}, opts, {"", acc <> buffer <> "" <> text, user_acc}, opts, {buffer, acc, {:close, 1}}, handler), do: do_parse({text, user_acc}, opts, {"", acc <> buffer <> ">", :parsing}, handler) defp do_parse({">" <> text, user_acc}, opts, {buffer, acc, {:close, level}}, handler), do: do_parse( {text, user_acc}, opts, {"", acc <> buffer <> ">", {:html, level - 1}}, handler ) defp do_parse({" " <> text, user_acc}, opts, {buffer, acc, {:open, level}}, handler), do: do_parse( {text, user_acc}, opts, {"", acc <> buffer <> " ", {:attrs, level}}, handler ) defp do_parse({"\n" <> text, user_acc}, opts, {buffer, acc, {:open, level}}, handler), do: do_parse( {text, user_acc}, opts, {"", acc <> buffer <> "\n", {:attrs, level}}, handler ) # default cases where state is not important defp do_parse( {" " <> text, user_acc}, %{phone: _} = opts, {buffer, acc, state}, handler ), do: do_parse({text, user_acc}, opts, {buffer <> " ", acc, state}, handler) defp do_parse({" " <> text, user_acc}, opts, {buffer, acc, state}, handler) do {buffer, user_acc} = run_handler(handler, buffer, opts, user_acc) do_parse( {text, user_acc}, opts, {"", acc <> buffer <> " ", state}, handler ) end defp do_parse({"\n" <> text, user_acc}, opts, {buffer, acc, state}, handler) do {buffer, user_acc} = run_handler(handler, buffer, opts, user_acc) do_parse( {text, user_acc}, opts, {"", acc <> buffer <> "\n", state}, handler ) end defp do_parse({<>, user_acc}, opts, {buffer, acc, state}, handler) do {buffer, user_acc} = run_handler(handler, buffer <> <>, opts, user_acc) do_parse( {"", user_acc}, opts, {"", acc <> buffer, state}, handler ) end defp do_parse({<> <> text, user_acc}, opts, {buffer, acc, state}, handler), do: do_parse({text, user_acc}, opts, {buffer <> <>, acc, state}, handler) def check_and_link(buffer, opts, _user_acc) do buffer |> is_url?(opts[:scheme]) |> link_url(buffer, opts) end def check_and_link_email(buffer, opts, _user_acc) do buffer |> is_email? |> link_email(buffer, opts) end def check_and_link_phone(buffer, opts, _user_acc) do buffer |> match_phone |> link_phone(buffer, opts) end def check_and_link_mention(buffer, opts, user_acc) do buffer |> match_mention |> link_mention(buffer, opts, user_acc) end def check_and_link_hashtag(buffer, opts, user_acc) do buffer |> match_hashtag |> link_hashtag(buffer, opts, user_acc) end def check_and_link_extra("xmpp:" <> handle, opts, _user_acc) do handle |> is_email? |> link_extra("xmpp:" <> handle, opts) end def check_and_link_extra(buffer, opts, _user_acc) do buffer |> String.starts_with?(@prefix_extra) |> link_extra(buffer, opts) end # @doc false def is_url?(buffer, true) do if Regex.match?(@invalid_url, buffer) do false else @match_scheme |> Regex.match?(buffer) |> is_valid_tld?(buffer) end end def is_url?(buffer, _) do if Regex.match?(@invalid_url, buffer) do false else @match_url |> Regex.match?(buffer) |> is_valid_tld?(buffer) end end def is_email?(buffer) do if Regex.match?(@invalid_url, buffer) do false else @match_email |> Regex.match?(buffer) |> is_valid_tld?(buffer) end end def is_valid_tld?(true, buffer) do [host] = Regex.run(@match_hostname, buffer, capture: [:host]) if is_ip?(host) do true else tld = host |> String.split(".") |> List.last() Enum.member?(@tlds, tld) end end def is_valid_tld?(false, _), do: false def is_ip?(buffer) do Regex.match?(@match_ip, buffer) end @doc false def match_phone(buffer) do case Regex.scan(@match_phone, buffer) do [] -> nil other -> other end end def match_mention(buffer) do case Regex.run(@match_mention, buffer) do [mention] -> mention _ -> nil end end def match_hashtag(buffer) do case Regex.run(@match_hashtag, buffer, capture: [:tag]) do [hashtag] -> hashtag _ -> nil end end def link_hashtag(nil, buffer, _, _user_acc), do: buffer def link_hashtag(hashtag, buffer, %{hashtag_handler: hashtag_handler} = opts, user_acc) do hashtag_handler.(hashtag, buffer, opts, user_acc) end def link_hashtag(hashtag, buffer, opts, _user_acc) do Builder.create_hashtag_link(hashtag, buffer, opts) end def link_mention(nil, buffer, _, user_acc), do: {buffer, user_acc} def link_mention(mention, buffer, %{mention_handler: mention_handler} = opts, user_acc) do mention_handler.(mention, buffer, opts, user_acc) end def link_mention(mention, buffer, opts, _user_acc) do Builder.create_mention_link(mention, buffer, opts) end def link_phone(nil, buffer, _), do: buffer def link_phone(list, buffer, opts) do Builder.create_phone_link(list, buffer, opts) end @doc false def link_url(true, buffer, opts) do Builder.create_link(buffer, opts) end def link_url(_, buffer, _opts), do: buffer @doc false def link_email(true, buffer, opts) do Builder.create_email_link(buffer, opts) end def link_email(_, buffer, _opts), do: buffer def link_extra(true, buffer, opts) do Builder.create_extra_link(buffer, opts) end def link_extra(_, buffer, _opts), do: buffer defp run_handler(handler, buffer, opts, user_acc) do case handler.(buffer, opts, user_acc) do {buffer, user_acc} -> {buffer, user_acc} buffer -> {buffer, user_acc} end end end