zf

zenflows testing
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helpers.ex (2219B)

      1 defmodule EarmarkParser.Helpers do
      2 
      3   @moduledoc false
      4   @doc """
      5   Expand tabs to multiples of 4 columns
      6   """
      7   def expand_tabs(line) do
      8     Regex.replace(~r{(.*?)\t}, line, &expander/2)
      9   end
     10 
     11   @trailing_ial_rgx ~r< (\s* \S .*?) {: \s* ([^}]+) \s* } \s* \z>x
     12   @doc ~S"""
     13   Returns a tuple containing a potentially present IAL and the line w/o the IAL
     14 
     15       iex(1)> extract_ial("# A headline")
     16       {nil, "# A headline"}
     17 
     18       iex(2)> extract_ial("# A classy headline{:.classy}")
     19       {".classy", "# A classy headline"}
     20 
     21   An IAL line, remains an IAL line though
     22 
     23       iex(3)> extract_ial("{:.line-ial}")
     24       {nil, "{:.line-ial}"}
     25   """
     26   def extract_ial(line) do
     27     case Regex.run(@trailing_ial_rgx, line) do
     28       nil -> {nil, line}
     29       [_, line_, ial] -> {ial, line_}
     30     end
     31   end
     32 
     33   defp expander(_, leader) do
     34     extra = 4 - rem(String.length(leader), 4)
     35     leader <> pad(extra)
     36   end
     37 
     38   @doc """
     39   Remove newlines at end of line and optionally annotations
     40   """
     41   # def remove_line_ending(line, annotation \\ nil)
     42   def remove_line_ending(line, nil) do
     43     _trim_line({line, nil})
     44   end
     45   def remove_line_ending(line, annotation) do
     46     case Regex.run(annotation, line) do
     47       nil -> _trim_line({line, nil})
     48       match -> match |> tl() |> List.to_tuple |> _trim_line()
     49     end
     50   end
     51 
     52   defp _trim_line({line, annot}), do: {line |> String.trim_trailing("\n") |> String.trim_trailing("\r"), annot}
     53 
     54   defp pad(1), do: " "
     55   defp pad(2), do: "  "
     56   defp pad(3), do: "   "
     57   defp pad(4), do: "    "
     58 
     59   @doc """
     60   `Regex.replace` with the arguments in the correct order
     61   """
     62 
     63   def replace(text, regex, replacement, options \\ []) do
     64     Regex.replace(regex, text, replacement, options)
     65   end
     66 
     67   @doc """
     68   Replace <, >, and quotes with the corresponding entities. If
     69   `encode` is true, convert ampersands, too, otherwise only
     70    convert non-entity ampersands.
     71   """
     72 
     73   @amp_rgx ~r{&(?!#?\w+;)}
     74 
     75   def escape(html), do: _escape(Regex.replace(@amp_rgx, html, "&amp;"))
     76 
     77 
     78   defp _escape(html) do
     79     html
     80     |> String.replace("<", "&lt;")
     81     |> String.replace(">", "&gt;")
     82     |> String.replace("\"", "&quot;")
     83     |> String.replace("'", "&#39;")
     84   end
     85 end
     86 
     87 # SPDX-License-Identifier: Apache-2.0