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token.ex
264 lines (197 loc) · 7.81 KB
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token.ex
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defmodule Credo.Code.Token do
@moduledoc """
This module provides helper functions to analyse tokens returned by `Credo.Code.to_tokens/1`.
"""
@doc """
Returns `true` if the given `token` contains a line break.
"""
def eol?(token)
def eol?(list) when is_list(list) do
Enum.any?(list, &eol?/1)
end
def eol?({_, {_, _, _}, _, list, _, _}) when is_list(list) do
Enum.any?(list, &eol?/1)
end
def eol?({_, {_, _, _}, list}) when is_list(list) do
Enum.any?(list, &eol?/1)
end
def eol?({{_, _, _}, list}) when is_list(list) do
Enum.any?(list, &eol?/1)
end
def eol?({:eol, {_, _, _}}), do: true
def eol?(_), do: false
@doc """
Returns the position of a token in the form
{line_no_start, col_start, line_no_end, col_end}
"""
def position(token)
if Version.match?(System.version(), ">= 1.6.0-rc") do
# Elixir >= 1.6.0
defdelegate position(token), to: __MODULE__.PositionHelper
else
# Elixir <= 1.5.x
defdelegate position(token), to: __MODULE__.ElixirPre1_6_0
end
defmodule PositionHelper do
@moduledoc false
@doc false
def position({_, {line_no, col_start, _}, atom_or_charlist, _, _, _}) do
position_tuple(atom_or_charlist, line_no, col_start)
end
def position({_, {line_no, col_start, _}, atom_or_charlist, _, _}) do
position_tuple(atom_or_charlist, line_no, col_start)
end
def position({_, {line_no, col_start, _}, atom_or_charlist, _}) do
position_tuple(atom_or_charlist, line_no, col_start)
end
def position({:bin_string, {line_no, col_start, _}, atom_or_charlist}) do
position_tuple_for_quoted_string(atom_or_charlist, line_no, col_start)
end
def position({:list_string, {line_no, col_start, _}, atom_or_charlist}) do
position_tuple_for_quoted_string(atom_or_charlist, line_no, col_start)
end
def position({:bin_heredoc, {line_no, col_start, _}, atom_or_charlist}) do
position_tuple_for_heredoc(atom_or_charlist, line_no, col_start)
end
def position({:atom_unsafe, {line_no, col_start, _}, atom_or_charlist}) do
position_tuple_for_quoted_string(atom_or_charlist, line_no, col_start)
end
def position({_, {line_no, col_start, _}, atom_or_charlist}) do
position_tuple(atom_or_charlist, line_no, col_start)
end
def position({atom_or_charlist, {line_no, col_start, _}}) do
position_tuple(atom_or_charlist, line_no, col_start)
end
# interpolation
def position({{line_no, col_start, _}, list}) when is_list(list) do
{line_no, col_start, line_no_end, col_end} =
position_tuple_for_quoted_string(list, line_no, col_start)
{line_no, col_start, line_no_end, col_end}
end
#
defp position_tuple(list, line_no, col_start) when is_list(list) do
binary = to_string(list)
col_end = col_start + String.length(binary)
{line_no, col_start, line_no, col_end}
end
defp position_tuple(atom, line_no, col_start) when is_atom(atom) do
binary = to_string(atom)
col_end = col_start + String.length(binary)
{line_no, col_start, line_no, col_end}
end
defp position_tuple(number, line_no, col_start) when is_number(number) do
binary = to_string([number])
col_end = col_start + String.length(binary)
{line_no, col_start, line_no, col_end}
end
defp position_tuple(_, _line_no, _col_start), do: nil
defp position_tuple_for_heredoc(list, line_no, col_start)
when is_list(list) do
# add 3 for """ (closing double quote)
{line_no_end, col_end, _terminator} = convert_to_col_end(line_no, col_start, list)
col_end = col_end + 3
{line_no, col_start, line_no_end, col_end}
end
@doc false
def position_tuple_for_quoted_string(list, line_no, col_start)
when is_list(list) do
# add 1 for " (closing double quote)
{line_no_end, col_end, terminator} = convert_to_col_end(line_no, col_start, list)
{line_no_end, col_end} =
case terminator do
:eol ->
# move to next line
{line_no_end + 1, 1}
_ ->
# add 1 for " (closing double quote)
{line_no_end, col_end + 1}
end
{line_no, col_start, line_no_end, col_end}
end
#
defp convert_to_col_end(line_no, col_start, list) when is_list(list) do
Enum.reduce(list, {line_no, col_start, nil}, &reduce_to_col_end/2)
end
# {{1, 25, 32}, [{:identifier, {1, 27, 31}, :name}]}
defp convert_to_col_end(_, _, {{line_no, col_start, _}, list}) do
{line_no_end, col_end, _terminator} = convert_to_col_end(line_no, col_start, list)
# add 1 for } (closing parens of interpolation)
col_end = col_end + 1
{line_no_end, col_end, :interpolation}
end
defp convert_to_col_end(_, _, {:eol, {line_no, col_start, _}}) do
{line_no, col_start, :eol}
end
defp convert_to_col_end(_, _, {value, {line_no, col_start, _}}) do
{line_no, to_col_end(col_start, value), nil}
end
defp convert_to_col_end(_, _, {:bin_string, {line_no, col_start, nil}, list})
when is_list(list) do
# add 2 for opening and closing "
{line_no, col_end, terminator} =
Enum.reduce(list, {line_no, col_start, nil}, &reduce_to_col_end/2)
{line_no, col_end + 2, terminator}
end
defp convert_to_col_end(_, _, {:bin_string, {line_no, col_start, nil}, value}) do
# add 2 for opening and closing "
{line_no, to_col_end(col_start, value, 2), :bin_string}
end
defp convert_to_col_end(_, _, {:list_string, {line_no, col_start, nil}, value}) do
# add 2 for opening and closing '
{line_no, to_col_end(col_start, value, 2), :bin_string}
end
defp convert_to_col_end(_, _, {_, {line_no, col_start, nil}, list})
when is_list(list) do
Enum.reduce(list, {line_no, col_start, nil}, &reduce_to_col_end/2)
end
defp convert_to_col_end(_, _, {_, {line_no, col_start, nil}, value}) do
{line_no, to_col_end(col_start, value), nil}
end
defp convert_to_col_end(_, _, {:aliases, {line_no, col_start, _}, list}) do
value = Enum.map(list, &to_string/1)
{line_no, to_col_end(col_start, value), nil}
end
defp convert_to_col_end(_, _, {_, {line_no, col_start, _}, value}) do
{line_no, to_col_end(col_start, value), nil}
end
defp convert_to_col_end(_, _, {:sigil, {line_no, col_start, nil}, _, value, _, _}) do
{line_no, to_col_end(col_start, value), nil}
end
defp convert_to_col_end(line_no, col_start, value) do
{line_no, to_col_end(col_start, value), nil}
end
#
defp reduce_to_col_end(value, {current_line_no, current_col_start, _}) do
convert_to_col_end(current_line_no, current_col_start, value)
end
#
def to_col_end(col_start, value, add \\ 0) do
col_start + String.length(to_string(value)) + add
end
end
# credo:disable-for-next-line Credo.Check.Readability.ModuleNames
defmodule ElixirPre1_6_0 do
@moduledoc false
alias Credo.Code.Token
alias Credo.Code.Token.PositionHelper
@doc false
def position(token) do
position(token, Token.eol?(token))
end
def position(token, true) do
{line_no, col_start, col_end_pre_160} = do_position(token)
{_line_no, _col_start, line_no_end, col_end} = PositionHelper.position(token)
{line_no, col_start, line_no_end, max(col_end, col_end_pre_160)}
end
def position(token, false) do
{line_no, col_start, col_end} = do_position(token)
{line_no, col_start, line_no, col_end}
end
defp do_position({_, pos, _, _, _, _}), do: pos
defp do_position({_, pos, _, _, _}), do: pos
defp do_position({_, pos, _, _}), do: pos
defp do_position({_, pos, _}), do: pos
defp do_position({pos, list}) when is_list(list), do: pos
defp do_position({atom, pos}) when is_atom(atom), do: pos
end
end