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96 lines
3.2 KiB
96 lines
3.2 KiB
defmodule AutoLinker.Parser do
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@moduledoc """
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Module to handle parsing the the input string.
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"""
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alias AutoLinker.Builder
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@doc """
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Parse the given string.
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Parses the string, replacing the matching urls with an html link.
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## Examples
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iex> AutoLinker.Parser.parse("Check out google.com")
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"Check out <a href='http://google.com' class='auto-linker' target='_blank' rel='noopener noreferrer'>google.com</a>"
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"""
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def parse(text, opts \\ %{})
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def parse(text, list) when is_list(list), do: parse(text, Enum.into(list, %{}))
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def parse(text, opts) do
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if (exclude = Map.get(opts, :exclude_pattern, false)) && String.starts_with?(text, exclude) do
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text
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else
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parse(text, Map.get(opts, :scheme, false), opts, {"", "", :parsing})
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end
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end
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# state = {buffer, acc, state}
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defp parse("", _scheme, _opts ,{"", acc, _}),
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do: acc
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defp parse("", scheme, opts ,{buffer, acc, _}),
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do: acc <> check_and_link(buffer, scheme, opts)
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defp parse("<" <> text, scheme, opts, {"", acc, :parsing}),
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do: parse(text, scheme, opts, {"<", acc, {:open, 1}})
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defp parse(">" <> text, scheme, opts, {buffer, acc, {:attrs, level}}),
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do: parse(text, scheme, opts, {"", acc <> buffer <> ">", {:html, level}})
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defp parse(<<ch::8>> <> text, scheme, opts, {"", acc, {:attrs, level}}),
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do: parse(text, scheme, opts, {"", acc <> <<ch::8>>, {:attrs, level}})
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defp parse("</" <> text, scheme, opts, {buffer, acc, {:html, level}}),
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do: parse(text, scheme, opts,
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{"", acc <> check_and_link(buffer, scheme, opts) <> "</", {:close, level}})
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defp parse(">" <> text, scheme, opts, {buffer, acc, {:close, 1}}),
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do: parse(text, scheme, opts, {"", acc <> buffer <> ">", :parsing})
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defp parse(">" <> text, scheme, opts, {buffer, acc, {:close, level}}),
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do: parse(text, scheme, opts, {"", acc <> buffer <> ">", {:html, level - 1}})
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defp parse(" " <> text, scheme, opts, {buffer, acc, {:open, level}}),
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do: parse(text, scheme, opts, {"", acc <> buffer <> " ", {:attrs, level}})
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defp parse("\n" <> text, scheme, opts, {buffer, acc, {:open, level}}),
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do: parse(text, scheme, opts, {"", acc <> buffer <> "\n", {:attrs, level}})
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# default cases where state is not important
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defp parse(" " <> text, scheme, opts, {buffer, acc, state}),
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do: parse(text, scheme, opts,
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{"", acc <> check_and_link(buffer, scheme, opts) <> " ", state})
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defp parse("\n" <> text, scheme, opts, {buffer, acc, state}),
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do: parse(text, scheme, opts,
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{"", acc <> check_and_link(buffer, scheme, opts) <> "\n", state})
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defp parse(<<ch::8>> <> text, scheme, opts, {buffer, acc, state}),
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do: parse(text, scheme, opts, {buffer <> <<ch::8>>, acc, state})
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defp check_and_link(buffer, scheme, opts) do
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buffer
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|> is_url?(scheme)
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|> link_url(buffer, opts)
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end
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@doc false
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def is_url?(buffer, true) do
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re = ~r{^(?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=.]+$}
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Regex.match? re, buffer
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end
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def is_url?(buffer, _) do
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re = ~r{^[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=.]+$}
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Regex.match? re, buffer
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end
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@doc false
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def link_url(true, buffer, opts) do
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Builder.create_link(buffer, opts)
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end
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def link_url(_, buffer, _opts), do: buffer
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end
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