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auto_linker/lib/auto_linker/parser.ex

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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 <a href="http://google.com" class="auto-linker" target="_blank" rel="noopener noreferrer">google.com</a>}
iex> AutoLinker.Parser.parse("call me at x9999", phone: true)
~s{call me at <a href="#" class="phone-number" data-phone="9999">x9999</a>}
iex> AutoLinker.Parser.parse("or at home on 555.555.5555", phone: true)
~s{or at home on <a href="#" class="phone-number" data-phone="5555555555">555.555.5555</a>}
iex> AutoLinker.Parser.parse(", work (555) 555-5555", phone: true)
~s{, work <a href="#" class="phone-number" data-phone="5555555555">(555) 555-5555</a>}
"""
# @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@)?(?<host>[^:#~\/\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])$"
# @user
# @user@example.com
@match_mention ~r/^@[a-zA-Z\d_-]+@[a-zA-Z0-9_-](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*|@[a-zA-Z\d_-]+/u
# https://www.w3.org/TR/html5/forms.html#valid-e-mail-address
@match_email ~r/^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[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/^(?<tag>\#\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, %{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, %{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, %{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, _), 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({"<a" <> text, user_acc}, opts, {buffer, acc, :parsing}, handler),
do: do_parse({text, user_acc}, opts, {"", acc <> buffer <> "<a", :skip}, handler)
defp do_parse({"</a>" <> text, user_acc}, opts, {buffer, acc, :skip}, handler),
do: do_parse({text, user_acc}, opts, {"", acc <> buffer <> "</a>", :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({<<ch::8>> <> text, user_acc}, opts, {"", acc, {:attrs, level}}, handler) do
do_parse({text, user_acc}, opts, {"", acc <> <<ch::8>>, {: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 <> "</", {:close, level}},
handler
)
end
defp do_parse({">" <> 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({<<ch::8>>, user_acc}, opts, {buffer, acc, state}, handler) do
{buffer, user_acc} = run_handler(handler, buffer <> <<ch::8>>, opts, user_acc)
do_parse(
{"", user_acc},
opts,
{"", acc <> buffer, state},
handler
)
end
defp do_parse({<<ch::8>> <> text, user_acc}, opts, {buffer, acc, state}, handler),
do: do_parse({text, user_acc}, opts, {buffer <> <<ch::8>>, 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
|> hashtag_handler.(buffer, opts, user_acc)
|> maybe_update_buffer(hashtag, buffer)
end
def link_hashtag(hashtag, buffer, opts, _user_acc) do
hashtag
|> Builder.create_hashtag_link(buffer, opts)
|> maybe_update_buffer(hashtag, buffer)
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
|> mention_handler.(buffer, opts, user_acc)
|> maybe_update_buffer(mention, buffer)
end
def link_mention(mention, buffer, opts, _user_acc) do
mention
|> Builder.create_mention_link(buffer, opts)
|> maybe_update_buffer(mention, buffer)
end
defp maybe_update_buffer(out, match, buffer) when is_binary(out) do
maybe_update_buffer({out, nil}, match, buffer)
end
defp maybe_update_buffer({out, user_acc}, match, buffer)
when match != buffer and out != buffer do
out = String.replace(buffer, match, out)
{out, user_acc}
end
defp maybe_update_buffer(out, _match, _buffer), do: out
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