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|
defmodule EarmarkParser.Helpers do
@moduledoc false
@doc """
Expand tabs to multiples of 4 columns
"""
def expand_tabs(line) do
Regex.replace(~r{(.*?)\t}, line, &expander/2)
end
@doc ~S"""
Returns a tuple containing a potentially present IAL and the line w/o the IAL
iex(1)> extract_ial("# A headline")
{nil, "# A headline"}
iex(2)> extract_ial("# A classy headline{:.classy}")
{".classy", "# A classy headline"}
An IAL line, remains an IAL line though
iex(3)> extract_ial("{:.line-ial}")
{nil, "{:.line-ial}"}
"""
def extract_ial(line) do
trailing_ial_rgx = ~r< (?<!^)(?'ial'{: \s* [^}]+ \s* }) \s* \z >x
case Regex.split(trailing_ial_rgx, line, include_captures: true, parts: 2, on: [:ial]) do
[_] ->
{nil, line}
[line_, "{:" <> ial, _] ->
ial_ =
ial
|> String.trim_trailing("}")
|> String.trim()
{ial_, String.trim_trailing(line_)}
end
end
defp expander(_, leader) do
extra = 4 - rem(String.length(leader), 4)
leader <> pad(extra)
end
@doc """
Remove newlines at end of line and optionally annotations
"""
# def remove_line_ending(line, annotation \\ nil)
def remove_line_ending(line, nil) do
_trim_line({line, nil})
end
def remove_line_ending(line, annotation) do
case Regex.run(annotation, line) do
nil -> _trim_line({line, nil})
match -> match |> tl() |> List.to_tuple() |> _trim_line()
end
end
defp _trim_line({line, annot}) do
{line |> String.trim_trailing("\n") |> String.trim_trailing("\r"), annot}
end
defp pad(1) do
" "
end
defp pad(2) do
" "
end
defp pad(3) do
" "
end
defp pad(4) do
" "
end
@doc """
`Regex.replace` with the arguments in the correct order
"""
def replace(text, regex, replacement, options \\ []) do
Regex.replace(regex, text, replacement, options)
end
@doc """
Replace <, >, and quotes with the corresponding entities. If
`encode` is true, convert ampersands, too, otherwise only
convert non-entity ampersands.
"""
def escape(html) do
_escape(Regex.replace(~r{&(?!#?\w+;)}, html, "&"))
end
defp _escape(html) do
html
|> String.replace("<", "<")
|> String.replace(">", ">")
|> String.replace("\"", """)
|> String.replace("'", "'")
end
end
# SPDX-License-Identifier: Apache-2.0
|
