:title: mal step 0
:date: 2026-09-03
:tags: mal, python
:identifier: 20260903T120848
:signature: 10=1

mal: Step 0
-----------

This step is the "Hello, world!" of the process, setting up a repl.
Going by the architecture diagram, this stage it only needs to echo the input it receives

**read**

.. code-block:: python
   :project: mal-py
   :filename: step0_repl.py

   import typing

   def read(ins: str):
       return ins

**eval**

.. code-block:: python
   :project: mal-py
   :filename: step0_repl.py

   def evaluate(ins: str):
       return ins


**print**

.. code-block:: python
   :project: mal-py
   :filename: step0_repl.py

   def printit(ins: str):
       return ins

**rep**

.. code-block:: python
   :project: mal-py
   :filename: step0_repl.py

   def rep(ins: str):
       return printit(evaluate(read(ins)))


**repl**

.. code-block:: python
   :project: mal-py
   :filename: step0_repl.py

   def repl(ins: io.TextIO):
       print("user> ", end='', flush=True)
       while (line := ins.readline()) != "":
           print(rep(line))
           print("user> ", end='', flush=True)


   if __name__ == "__main__":
       import sys
       repl(sys.stdin)