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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/check/refactor/module_dependencies.ex
defmodule Credo.Check.Refactor.ModuleDependencies do
use Credo.Check,
base_priority: :normal,
tags: [:controversial],
param_defaults: [
max_deps: 10,
dependency_namespaces: [],
excluded_namespaces: [],
excluded_paths: [~r"/test/", ~r"^test/"]
],
explanations: [
check: """
This module might be doing too much. Consider limiting the number of
module dependencies.
As always: This is just a suggestion. Check the configuration options for
tweaking or disabling this check.
""",
params: [
max_deps: "Maximum number of module dependencies.",
dependency_namespaces: "List of dependency namespaces to include in this check",
excluded_namespaces: "List of namespaces to exclude from this check",
excluded_paths: "List of paths or regex to exclude from this check"
]
]
alias Credo.Code.Name
alias Credo.Code.Module
@doc false
@impl true
def run(%SourceFile{} = source_file, params) do
issue_meta = IssueMeta.for(source_file, params)
max_deps = Params.get(params, :max_deps, __MODULE__)
dependency_namespaces = Params.get(params, :dependency_namespaces, __MODULE__)
excluded_namespaces = Params.get(params, :excluded_namespaces, __MODULE__)
excluded_paths = Params.get(params, :excluded_paths, __MODULE__)
case ignore_path?(source_file.filename, excluded_paths) do
true ->
[]
false ->
Credo.Code.prewalk(
source_file,
&traverse(
&1,
&2,
issue_meta,
dependency_namespaces,
excluded_namespaces,
max_deps
)
)
end
end
# Check if analyzed module path is within ignored paths
defp ignore_path?(filename, excluded_paths) do
directory = Path.dirname(filename)
Enum.any?(excluded_paths, &matches?(directory, &1))
end
defp matches?(directory, %Regex{} = regex), do: Regex.match?(regex, directory)
defp matches?(directory, path) when is_binary(path), do: String.starts_with?(directory, path)
defp traverse(
{:defmodule, meta, [mod | _]} = ast,
issues,
issue_meta,
dependency_namespaces,
excluded_namespaces,
max
) do
module_name = Name.full(mod)
new_issues =
if has_namespace?(module_name, excluded_namespaces) do
[]
else
module_dependencies = get_dependencies(ast, dependency_namespaces)
issues_for_module(module_dependencies, max, issue_meta, meta)
end
{ast, issues ++ new_issues}
end
defp traverse(ast, issues, _issues_meta, _dependency_namespaces, _excluded_namespaces, _max) do
{ast, issues}
end
defp get_dependencies(ast, dependency_namespaces) do
aliases = Module.aliases(ast)
ast
|> Module.modules()
|> with_fullnames(aliases)
|> filter_namespaces(dependency_namespaces)
end
defp issues_for_module(deps, max_deps, issue_meta, meta) when length(deps) > max_deps do
[
format_issue(
issue_meta,
message: "Module has too many dependencies: #{length(deps)} (max is #{max_deps})",
trigger: deps,
line_no: meta[:line],
column_no: meta[:column]
)
]
end
defp issues_for_module(_, _, _, _), do: []
# Resolve dependencies to full module names
defp with_fullnames(dependencies, aliases) do
dependencies
|> Enum.map(&full_name(&1, aliases))
|> Enum.uniq()
end
# Keep only dependencies which are within specified namespaces
defp filter_namespaces(dependencies, namespaces) do
Enum.filter(dependencies, &keep?(&1, namespaces))
end
defp keep?(_module_name, []), do: true
defp keep?(module_name, namespaces), do: has_namespace?(module_name, namespaces)
defp has_namespace?(module_name, namespaces) do
Enum.any?(namespaces, &String.starts_with?(module_name, &1))
end
# Get full module name from list of aliases (if present)
defp full_name(dep, aliases) do
aliases
|> Enum.find(&String.ends_with?(&1, dep))
|> case do
nil -> dep
full_name -> full_name
end
end
end