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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/strings.ex
defmodule Credo.Code.Strings do
@moduledoc """
This module let's you strip strings from source code.
"""
@sigil_delimiters [{"(", ")"}, {"[", "]"}, {"{", "}"}, {"<", ">"},
{"|", "|"}, {"\"", "\""}, {"'", "'"}]
@all_string_sigils @sigil_delimiters |> Enum.flat_map(fn({b, e}) -> [{"~s#{b}", e}, {"~S#{b}", e}] end)
@doc """
Replaces all characters inside string literals and string 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} <- @all_string_sigils do
defp parse_code(<< unquote(sigil_start)::utf8, t::binary >>, acc, replacement) do
parse_string_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_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(str, acc, replacement) when is_binary(str) do
{h, t} = str |> String.next_codepoint
parse_code(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(<< _::utf8, t::binary >>, acc, replacement) do
parse_string_literal(t, acc <> replacement, replacement)
end
for {_sigil_start, sigil_end} <- @all_string_sigils do
defp parse_string_sigil("", acc, unquote(sigil_end), _replacement) do
acc
end
defp parse_string_sigil(<< "\\\\"::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_string_sigil(t, acc, unquote(sigil_end), replacement)
end
defp parse_string_sigil(<< "\\\""::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_string_sigil(t, acc, unquote(sigil_end), replacement)
end
defp parse_string_sigil(<< unquote(sigil_end)::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_code(t, acc <> unquote(sigil_end), replacement)
end
defp parse_string_sigil(<< "\n"::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_string_sigil(t, acc <> "\n", unquote(sigil_end), replacement)
end
defp parse_string_sigil(<< _::utf8, t::binary >>, acc, unquote(sigil_end), replacement) do
parse_string_sigil(t, acc <> " ", 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(<< _::utf8, t::binary >>, acc, replacement) do
parse_heredoc(t, acc <> replacement, replacement)
end
end