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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.ex
defmodule Credo.Code do
@moduledoc """
Credo.Code contains a lot of utility or helper functions that deal with the
analysis if - you guessed it - Code.
Whenever a function serves a general purpose in this area, e.g. getting the
value of a module attribute inside a given module, we want to extract that
function and put it here, so others can utilize them without reinventing
the wheel.
"""
alias Credo.SourceFile
defmodule ParserError do
@explanation ""
use Credo.Check, category: :error
end
@doc """
Traverses a given SourceFile's AST or a given AST.
Technically this is just a wrapper around `Macro.prewalk/3`.
"""
def traverse(ast_or_source_file, fun, accumulator \\ [])
def traverse(%SourceFile{ast: source_ast}, fun, accumulator) do
traverse(source_ast, fun, accumulator)
end
def traverse(source_ast, fun, accumulator) do
{_, accumulated} = Macro.prewalk(source_ast, accumulator, fun)
accumulated
end
@doc """
Takes a SourceFile or String and returns an AST.
"""
def ast(%SourceFile{source: source, filename: filename}) do
ast(source, filename)
end
def ast(source, filename \\ "nofilename") do
case Code.string_to_quoted(source, line: 1) do
{:ok, value} -> {:ok, value}
{:error, error} -> {:error, [issue_for(error, filename)]}
end
end
@doc """
Converts a String into a List of tuples of `{line_no, line}`.
"""
def to_lines(source) do
source
|> String.split("\n")
|> Enum.with_index
|> Enum.map(fn {line, i} -> {i + 1, line} end)
end
defp issue_for({line_no, error_message, _}, filename) do
%Credo.Issue{
check: ParserError,
category: :error,
filename: filename,
message: error_message,
line_no: line_no
}
end
end