module SimpleCov::StaticCoverageExtractor

def call(source)

extract — fall back to empty hashes."
when Prism isn't available; callers should treat that as "couldn't
`Coverage.result[path]` produces. Returns nil on parse failure or
`{"branches" => {...}, "methods" => {...}}` matching the shape that
Parse `source` (a string of Ruby) and return a hash of the form 
def call(source)
  # simplecov:disable branch — `then` arm unreachable when Prism IS loadable
  return nil unless available?
  # simplecov:enable branch
  result = ::Prism.parse(source)
  return nil if result.failure?
  visitor = Visitor.new
  visitor.visit(result.value)
  {"branches" => visitor.branches, "methods" => visitor.methods}
rescue StandardError
  # simplecov:disable line
  # Parser errors beyond the .failure? check, unsupported AST shapes,
  # or anything else: fall back to empty hashes rather than crashing
  # the whole report. Defensive; hard to trigger from a real source
  # input that Prism accepts at parse time.
  nil
  # simplecov:enable line
end