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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
@moduledoc """
`SourceFile` structs represent a source file in the codebase.
"""
@type t :: %__MODULE__{
filename: nil | String.t(),
hash: String.t(),
status: :valid | :invalid | :timed_out
}
alias Credo.Service.SourceFileAST
alias Credo.Service.SourceFileLines
alias Credo.Service.SourceFileSource
defstruct filename: nil,
hash: nil,
status: nil
defimpl Inspect, for: __MODULE__ do
def inspect(source_file, _opts) do
"%SourceFile<#{source_file.filename}>"
end
end
@doc """
Returns a `SourceFile` struct for the given `source` code and `filename`.
"""
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
hash =
:sha256
|> :crypto.hash(source)
|> Base.encode16()
source_file = %Credo.SourceFile{
filename: filename,
hash: hash,
status: if(valid, do: :valid, else: :invalid)
}
SourceFileAST.put(source_file, ast)
SourceFileLines.put(source_file, lines)
SourceFileSource.put(source_file, source)
source_file
end
@spec timed_out(String.t()) :: t
def timed_out(filename) do
filename = Path.relative_to_cwd(filename)
%Credo.SourceFile{
filename: filename,
hash: "timed_out:#{filename}",
status: :timed_out
}
end
@doc "Returns the AST for the given `source_file`."
def ast(source_file)
def ast(%__MODULE__{} = source_file) do
case SourceFileAST.get(source_file) do
{:ok, ast} ->
ast
_ ->
raise "Could not get source from ETS: #{source_file.filename}"
end
end
@doc "Returns the lines of source code for the given `source_file`."
def lines(source_file)
def lines(%__MODULE__{} = source_file) do
case SourceFileLines.get(source_file) do
{:ok, lines} ->
lines
_ ->
raise "Could not get source from ETS: #{source_file.filename}"
end
end
@doc "Returns the source code for the given `source_file`."
def source(source_file)
def source(%__MODULE__{} = source_file) do
case SourceFileSource.get(source_file) do
{:ok, source} ->
source
_ ->
raise "Could not get source from ETS: #{source_file.filename}"
end
end
@doc "Returns the source code and filename for the given `source_file_or_source`."
def source_and_filename(source_file_or_source, default_filename \\ "nofilename")
def source_and_filename(%__MODULE__{filename: filename} = source_file, _default_filename) do
{source(source_file), filename}
end
def source_and_filename(source, default_filename) when is_binary(source) do
{source, default_filename}
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(source_file, line_no, trigger)
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/(\s|\b|\(|\)|\,)(#{regexed})(\s|\b|\(|\)|\,)/, line, return: :index) do
nil ->
nil
[_, _, {regexed_col, _regexed_length}, _] ->
regexed_col + 1
end
end
def column(_, _, _), do: nil
end