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metastatic
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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/mix/tasks/metastatic.control_flow.ex
defmodule Mix.Tasks.Metastatic.ControlFlow do
@shortdoc "Generates control flow graph"
use Mix.Task
alias Metastatic.Analysis.ControlFlow
alias Metastatic.Builder
def run(args) do
{opts, files, _} =
OptionParser.parse(args, strict: [format: :string, language: :string, output: :string])
case files do
[] ->
Mix.shell().error("Usage: mix metastatic.control_flow FILE [--format dot|d3|json]")
exit({:shutdown, 2})
[file | _] ->
analyze(file, opts)
end
end
defp analyze(file, opts) do
unless File.exists?(file),
do:
(
Mix.shell().error("File not found")
exit({:shutdown, 2})
)
source = File.read!(file)
lang = opts[:language] || detect_lang(file)
format = opts[:format] || "json"
case Builder.from_source(source, String.to_atom(lang)) do
{:ok, doc} ->
{:ok, result} = ControlFlow.analyze(doc)
output =
case format do
"dot" -> ControlFlow.Result.to_dot(result)
"d3" -> Jason.encode!(ControlFlow.Result.to_d3_json(result), pretty: true)
_ -> Jason.encode!(ControlFlow.Result.to_map(result), pretty: true)
end
if opts[:output] do
File.write!(opts[:output], output)
Mix.shell().info("CFG written to #{opts[:output]}")
else
Mix.shell().info(output)
end
exit({:shutdown, 0})
{:error, reason} ->
Mix.shell().error("Parse error: #{inspect(reason)}")
exit({:shutdown, 2})
end
end
defp detect_lang(file) do
case Path.extname(file) do
".py" ->
"python"
".ex" ->
"elixir"
".exs" ->
"elixir"
".erl" ->
"erlang"
".rb" ->
"ruby"
".hs" ->
"haskell"
_ ->
Mix.shell().error("Cannot detect language")
exit({:shutdown, 2})
end
end
end