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credo
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A static code analysis tool with a focus on code consistency and teaching.
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lib/credo/code/sigils.ex
defmodule Credo.Code.Sigils do
@moduledoc """
This module lets you strip sigils from source code.
"""
@alphabet ~w(a b c d e f g h i j k l m n o p q r s t u v w x y z)
@sigil_delimiters [{"(", ")"}, {"[", "]"}, {"{", "}"}, {"<", ">"},
{"|", "|"}, {"/", "/"}, {"\"\"\"", "\"\"\""}, {"\"", "\""}, {"'", "'"}]
@all_sigil_chars Enum.flat_map(@alphabet, fn a ->
[a, String.upcase(a)]
end)
@all_sigil_starts Enum.map(@all_sigil_chars, fn c -> "~#{c}" end)
@removable_sigils Enum.flat_map(@sigil_delimiters, fn({b, e}) ->
Enum.flat_map(@all_sigil_starts, fn(start) ->
[{"#{start}#{b}", e}, {"#{start}#{b}", e}]
end)
end) |> Enum.uniq
@doc """
Replaces all characters inside all sigils with the equivalent amount of
white-space.
"""
def replace_with_spaces(source, replacement \\ " ") do
parse_code(source, "", replacement)
end
defp parse_code("", acc, _replacement) do
acc
end
for {sigil_start, sigil_end} <- @removable_sigils do
defp parse_code(<< unquote(sigil_start)::utf8, t::binary >>, acc, replacement) do
parse_removable_sigil(t, acc <> unquote(sigil_start), unquote(sigil_end), replacement)
end
end
defp parse_code(<< "\\\""::utf8, t::binary >>, acc, replacement) do
parse_code(t, acc <> "\\\"", replacement)
end
defp parse_code(<< "?\""::utf8, t::binary >>, acc, replacement) do
parse_code(t, acc <> "?\"", replacement)
end
defp parse_code(<< "#"::utf8, t::binary >>, acc, replacement) do
parse_comment(t, acc <> "#", replacement)
end
defp parse_code(<< "\"\"\""::utf8, t::binary >>, acc, replacement) do
parse_heredoc(t, acc <> ~s("""), replacement)
end
defp parse_code(<< "\""::utf8, t::binary >>, acc, replacement) do
parse_string_literal(t, acc <> "\"", replacement)
end
defp parse_code(<< h::utf8, t::binary >>, acc, replacement) do
parse_code(t, acc <> <<h :: utf8>>, replacement)
end
defp parse_code(str, acc, replacement) when is_binary(str) do
{h, t} = String.next_codepoint(str)
parse_code(t, acc <> h, replacement)
end
defp parse_comment("", acc, _replacement) do
acc
end
defp parse_comment(<< "\n"::utf8, t::binary >>, acc, replacement) do
parse_code(t, acc <> "\n", replacement)
end
defp parse_comment(str, acc, replacement) when is_binary(str) do
{h, t} = String.next_codepoint(str)
parse_comment(t, acc <> h, replacement)
end
defp parse_string_literal("", acc, _replacement) do
acc
end
defp parse_string_literal(<< "\\\\"::utf8, t::binary >>, acc, replacement) do
parse_string_literal(t, acc, replacement)
end
defp parse_string_literal(<< "\\\""::utf8, t::binary >>, acc, replacement) do
parse_string_literal(t, acc, replacement)
end
defp parse_string_literal(<< "\""::utf8, t::binary >>, acc, replacement) do
parse_code(t, acc <> ~s("), replacement)
end
defp parse_string_literal(<< "\n"::utf8, t::binary >>, acc, replacement) do
parse_string_literal(t, acc <> "\n", replacement)
end
defp parse_string_literal(str, acc, replacement) when is_binary(str) do
{h, t} = String.next_codepoint(str)
parse_string_literal(t, acc <> h, replacement)
end
for {_sigil_start, sigil_end} <- @removable_sigils do
defp parse_removable_sigil("", acc, unquote(sigil_end), _replacement) do
acc
end
defp parse_removable_sigil(<< "\\\\"::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_removable_sigil(t, acc, unquote(sigil_end), replacement)
end
defp parse_removable_sigil(<< unquote("\\#{sigil_end}")::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_removable_sigil(t, acc <> replacement <> replacement, unquote(sigil_end), replacement)
end
defp parse_removable_sigil(<< unquote(sigil_end)::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_code(t, acc <> unquote(sigil_end), replacement)
end
defp parse_removable_sigil(<< "\n"::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_removable_sigil(t, acc <> "\n", unquote(sigil_end), replacement)
end
defp parse_removable_sigil(<< _::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_removable_sigil(t, acc <> replacement, unquote(sigil_end), replacement)
end
end
defp parse_heredoc("", acc, _replacement) do
acc
end
defp parse_heredoc(<< "\\\\"::utf8, t::binary >>, acc, replacement) do
parse_heredoc(t, acc, replacement)
end
defp parse_heredoc(<< "\\\""::utf8, t::binary >>, acc, replacement) do
parse_heredoc(t, acc, replacement)
end
defp parse_heredoc(<< "\"\"\""::utf8, t::binary >>, acc, replacement) do
parse_code(t, acc <> ~s("""), replacement)
end
defp parse_heredoc(<< "\n"::utf8, t::binary >>, acc, replacement) do
parse_heredoc(t, acc <> "\n", replacement)
end
defp parse_heredoc(str, acc, replacement) when is_binary(str) do
{h, t} = String.next_codepoint(str)
parse_heredoc(t, acc <> h, replacement)
end
end