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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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Files
lib/credo/source_file.ex
defmodule Credo.SourceFile do
defstruct filename: nil,
valid?: nil
@type t :: module
alias Credo.Service.SourceFileAST
alias Credo.Service.SourceFileLines
alias Credo.Service.SourceFileSource
def parse(source, filename) do
filename = Path.relative_to_cwd(filename)
lines = Credo.Code.to_lines(source)
{valid, ast} =
case Credo.Code.ast(source) do
{:ok, ast} ->
{true, ast}
{:error, _errors} ->
{false, []}
end
SourceFileAST.put(filename, ast)
SourceFileLines.put(filename, lines)
SourceFileSource.put(filename, source)
%Credo.SourceFile{
filename: filename,
valid?: valid
}
end
def ast(%__MODULE__{filename: filename}) do
case SourceFileAST.get(filename) do
{:ok, ast} ->
ast
_ ->
raise "Could not get source from ETS: #{filename}"
end
end
def lines(%__MODULE__{filename: filename}) do
case SourceFileLines.get(filename) do
{:ok, lines} ->
lines
_ ->
raise "Could not get source from ETS: #{filename}"
end
end
def source(%__MODULE__{filename: filename}) do
case SourceFileSource.get(filename) do
{:ok, source} ->
source
_ ->
raise "Could not get source from ETS: #{filename}"
end
end
@doc """
Returns the line at the given +line_no+.
NOTE: +line_no+ is a 1-based index.
"""
def line_at(%__MODULE__{} = source_file, line_no) do
source_file
|> lines()
|> Enum.find_value(&find_line_at(&1, line_no))
end
defp find_line_at({line_no, text}, line_no), do: text
defp find_line_at(_, _), do: nil
@doc """
Returns the snippet at the given +line_no+ between +column1+ and +column2+.
NOTE: +line_no+ is a 1-based index.
"""
def line_at(%__MODULE__{} = source_file, line_no, column1, column2) do
source_file
|> line_at(line_no)
|> String.slice(column1 - 1, column2 - column1)
end
@doc """
Returns the column of the given +trigger+ inside the given line.
NOTE: Both +line_no+ and the returned index are 1-based.
"""
def column(%__MODULE__{} = source_file, line_no, trigger) when is_binary(trigger) or is_atom(trigger) do
line = line_at(source_file, line_no)
regexed =
trigger
|> to_string
|> Regex.escape
case Regex.run(~r/\b#{regexed}\b/, line, return: :index) do
nil ->
nil
result ->
{col, _} = List.first(result)
col + 1
end
end
def column(_, _, _), do: nil
defimpl Inspect, for: __MODULE__ do
def inspect(source_file, _opts) do
"%SourceFile<#{source_file.filename}>"
end
end
end