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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/charlists.ex
defmodule Credo.Code.Charlists do
@moduledoc """
This module lets you strip charlists from source code.
"""
alias Credo.Code.InterpolationHelper
alias Credo.SourceFile
@doc """
Replaces all characters inside charlists with the equivalent amount of
white-space.
"""
def replace_with_spaces(
source_file,
replacement \\ " ",
interpolation_replacement \\ " ",
filename \\ "nofilename"
) do
{source, filename} = SourceFile.source_and_filename(source_file, filename)
source
|> InterpolationHelper.replace_interpolations(interpolation_replacement, filename)
|> parse_code("", replacement)
end
defp parse_code("", acc, _replacement) do
acc
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_heredoc(t, acc <> ~s('''), 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_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_charlist(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_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
#
# Comments
#
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
#
# String Literals
#
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
#
# Charlists
#
defp parse_charlist("", acc, _replacement) do
acc
end
defp parse_charlist(<<"\\\\"::utf8, t::binary>>, acc, replacement) do
parse_charlist(t, acc <> replacement <> replacement, replacement)
end
defp parse_charlist(<<"\\\'"::utf8, t::binary>>, acc, replacement) do
parse_charlist(t, acc, replacement)
end
defp parse_charlist(<<"\'"::utf8, t::binary>>, acc, replacement) do
parse_code(t, acc <> "'", replacement)
end
defp parse_charlist(<<"\n"::utf8, t::binary>>, acc, replacement) do
parse_charlist(t, acc <> "\n", replacement)
end
defp parse_charlist(<<_::utf8, t::binary>>, acc, replacement) do
parse_charlist(t, acc <> replacement, replacement)
end
#
# Heredocs
#
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(<<"\'\'\'"::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