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Cross-language code meta-model library using unified MetaAST representation. Parse, transform, and translate code across Python, Elixir, Ruby, Erlang, Haskell, and more via a shared three-tuple AST format.
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lib/metastatic/supplemental/python/asyncio.ex
defmodule Metastatic.Supplemental.Python.Asyncio do
@moduledoc """
Supplemental module for Python's `asyncio` library.
Transforms async/await constructs into asyncio API calls. This supplemental
handles:
- `:async_await` - async/await patterns → asyncio.run()
- `:async_context` - async context managers → async with
- `:gather` - parallel execution → asyncio.gather()
## Examples
# Transform async function call
iex> ast = {:async_operation, :async_await,
...> {:function_call, "fetch_data", [
...> {:literal, :string, "https://api.example.com"}
...> ]}}
iex> {:ok, result} = Metastatic.Supplemental.Python.Asyncio.transform(ast, :python, %{})
iex> match?({:function_call, "asyncio.run", _}, result)
true
# Transform gather for parallel execution
iex> ast = {:async_operation, :gather, [
...> {:function_call, "fetch_user", [{:literal, :integer, 1}]},
...> {:function_call, "fetch_posts", [{:literal, :integer, 1}]}
...> ]}
iex> {:ok, result} = Metastatic.Supplemental.Python.Asyncio.transform(ast, :python, %{})
iex> match?({:function_call, "asyncio.gather", _}, result)
true
"""
@behaviour Metastatic.Supplemental
alias Metastatic.Supplemental.Info
@impl true
def info do
%Info{
name: :asyncio,
language: :python,
constructs: [:async_await, :async_context, :gather],
requires: ["asyncio"],
description: "Python asyncio library support for async/await patterns"
}
end
@impl true
def transform(ast, language, opts \\ %{})
def transform({:async_operation, :async_await, async_call}, :python, _opts) do
# Transform: async_await(call) → asyncio.run(call)
result = {:function_call, "asyncio.run", [async_call]}
{:ok, result}
end
def transform({:async_operation, :async_context, {resource, body}}, :python, _opts) do
# Transform: async_context(resource, body) → async with pattern
# Represented as language_specific since async with is Python-specific syntax
result =
{:language_specific, :python,
%{
type: :async_with,
resource: resource,
body: body
}}
{:ok, result}
end
def transform({:async_operation, :gather, tasks}, :python, _opts) when is_list(tasks) do
# Transform: gather([task1, task2, ...]) → asyncio.gather(task1, task2, ...)
result = {:function_call, "asyncio.gather", tasks}
{:ok, result}
end
def transform(ast, :python, _opts) do
{:error,
{:unsupported_construct, "Asyncio supplemental does not support construct: #{inspect(ast)}"}}
end
def transform(_ast, language, _opts) do
{:error,
{:incompatible_language, "Asyncio supplemental only supports Python, got: #{language}"}}
end
end