README

# Haskell Substitution Stepper

This project is part of Middlebury College's Functional Programming class.
It is a continuation of Ben Milwood's StepEval, and attempts to draw from his
experiences to create a more elegant and less buggy Haskell Substitution
Stepper.

Required packages:
- template-haskell
- haskell-src-meta

To run this program:
1. Type the following in the command line.
    runhaskell stepEvaluator.hs
2. Follow the prompts of the program.

Features:
1. Display steps of the following higher-order function calls (for Integers):
    - map
    - filter
    - fold
2. Valid operations for Integers:
    - addition
    - subtraction
    - multiplication
    - division*
    - boolean operations (==, /=)
    - (in)equality operations (<, <=, >, >=)
3. Repeatedly prompt the user to input source code.
4. Validate input source code before attempting to parse and print out the
    type of error if there was any.