ePolyglot

Victor Putz

Table of Contents

I. ePolyglot -- overview and background

1. Introduction
2. The problem and the solution
3. Tools
4. Conclusion and proposal
5. Requirements

II. Evolution of a Solution

6. Wrapping the Python/C API

Motivation
Theory and first steps
Helper functions in C--making Python helper macros accessable to SWIG
Additional added value--the PYTHON_CLIENT class

7. Shadow Classes

Motivation
Theory
The PYTHON_OBJECT shadow classes
Example: Using Python primitives from within Eiffel
Unit tests

8. Simple use of the embedded Python interpreter

Motivation
Theory
Example

9. User Classes

Motivation
Theory: User-defined classes
The make_eiffel_stub.py script
Example: Using the Python smtplib.SMTP class to send mail from within Eiffel

10. User Modules

Motivation
Theory
The make_eiffel_module Python script
The make_all_eiffel_stubs.py script
User modules at work: the re_test example

11. Calling Eiffel from Python

Motivation
Theory: Eiffel from C using the C-Eiffel Call-In Library
C from Python: Using SWIG to expose our Eiffel bindings to Python
Automating part of the process with make targets and the make_eiffel_glue_i.py script
Compiling the Eiffel exports into the Python-usable module eiffel_gluemodule.so
Simpler and Safer: Shadow classes for calling Eiffel from Python
Automating shadow class generation: the make_python_shadow_classes.py script
Problem 1: Garbage, garbage, who's got the garbage?
Problem 2: A tale of two binaries
The eiffel_from_python sample application

12. Scripting Eiffel with Python

Motivation
Theory
Why a custom interpreter?
The scripting_eiffel sample program

13. Haskell from Eiffel

Motivation
Theory--HaskellDirect
Our sample problem: Linear Regression
IDL: Writing the module interface
You mean HaskellDirect doesn't work?
C to Eiffel--Using SWIG to export the regression functions
Compiling the example
Sample program regression_test

14. All three: Eiffel, Python, and Haskell together

Motivation
Theory
Build problems with the multilanguage regression_test
Sample program regression_test, in three languages

15. Lessons Learned

III. Reference Documentation

16. The ePolyglot Eiffel object hierarchy

PYTHON_CLIENT and the low level interface
PYTHON_OBJECT
The PYTHON_NUMBER tree
The PYTHON_SEQUNCE tree
The PYTHON_MAPPING tree
PYTHON_FILE
PYTHON_OBJECT_FACTORY
PYTHON_USER_CLASS
PYTHON_MODULE
PYTHON_USER_MODULE

17. The supporting Python scripts for code generation

18. Dependencies and Data Flow

Making usable Eiffel classes from Haskell source code
Eiffel stubs from Python classes
Making Python shadow classes from Eiffel classes

Bibliography

Examination and development of multilanguage programming using Eiffel, Python, and Haskell

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		ePolyglot -- overview and background