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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/warning/spec_with_struct.ex
defmodule Credo.Check.Warning.SpecWithStruct do
use Credo.Check,
id: "EX5014",
base_priority: :normal,
category: :warning,
explanations: [
check: """
Structs create compile-time dependencies between modules. Using a struct in a spec
will cause the module to be recompiled whenever the struct's module changes.
It is preferable to define and use `MyModule.t()` instead of `%MyModule{}` in specs.
Example:
# preferred
@spec a_function(MyModule.t()) :: any
# NOT preferred
@spec a_function(%MyModule{}) :: any
"""
]
alias Credo.Code.Name
@doc false
@impl true
def run(%SourceFile{} = source_file, params) do
ctx = Context.build(source_file, params, __MODULE__)
result = Credo.Code.prewalk(source_file, &walk/2, ctx)
result.issues
end
defp walk({:@, _, [{:spec, _, args}]}, ctx) do
case Macro.prewalk(args, [], &find_structs/2) do
{ast, []} ->
{ast, ctx}
{ast, structs} ->
issues =
Enum.reduce(structs, [], fn {curr, meta}, acc ->
[issue_for(ctx, meta, curr) | acc]
end)
{ast, put_issue(ctx, issues)}
end
end
defp walk(ast, ctx) do
{ast, ctx}
end
defp find_structs({:%, meta, [{:__aliases__, _, _} = aliases | _]} = ast, acc) do
{ast, [{Name.full(aliases), meta} | acc]}
end
defp find_structs(ast, acc) do
{ast, acc}
end
defp issue_for(ctx, meta, struct) do
format_issue(ctx,
message: "Struct %#{struct}{} found in `@spec`.",
trigger: "%#{struct}{",
line_no: meta[:line],
column: meta[:column]
)
end
end