module python
imports libstrategolib signatures/- util

signature
  constructors
    TopLevel: Ex -> Ex

rules

  py: TopLevel(x) -> $[import sys
  class StdioC:
    def receives(self, v):
      print(v, file=sys.stdout, end='')
      return self
    def forwards(self, v):
      self.receives(v)
      return v
  Stdio = StdioC()
  [x]]

  py: Stdio() -> $[Stdio]
  py: Int(x) -> x
  py: Sum(x) -> $[sum([x])]
  py: Receives(x, y) -> $[[x].receives([y])]
  py: Enters(x, y) -> $[[y].forwards([x])]

  pylist: x -> $<[<<join(|", ")>x>]>

strategies

  // wrap with a toplevel, then generate code from the bottom up
  python = !TopLevel(<id>); bottomup(try(py <+ pylist))

  // Interface python code generation with editor services and file system
  to-python: (selected, _, _, path, project-path) -> (filename, result)
    with filename := <guarantee-extension(|"py")> path
       ; result   := <python> selected