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A simple stack-based language for teaching programming concepts.

Project description

# Flang

A stack-based programming language for teaching basic concepts.

Flang is an overly-simple programming language.

It’s intended for teaching, but isn’t quite complete yet.

For now, this is the feature list.

  • [X] Number type: Int
  • [X] Number type: Float
  • [ ] Number type: Rational
  • [X] Function type
  • [X] String type (UTF-8)
  • [X] Human-readable error messages, designed for beginners.
  • [-] As much parse-time safety as is possible.
  • [ ] Loops? (This may not happen, as we can push functions to the stack)
  • [ ] Conditionals
  • [ ] Swap function, to rearrange the stack
  • [ ] Slice function, to more easily rearrange large parts of the stack
  • [X] Print function, including using special characters inside strings
  • [X] Print/literal function, not including using special characters inside strings
  • [X] Print/stack function, for displaying the stack
  • [X] Exit function
  • [X] Reset function, to set the stack back to nothing
  • [X] Reverse function, to rearrange the stack
  • [X] Push function, for placing typed objects on the stack
  • [X] Add function, for mathematics or combining strings
  • [X] Take function, for mathematics
  • [X] Times function, for mathematics
  • [X] Divide function, for mathematics
  • [X] Pop function, for executing functions on the stack
  • [X] Peek function, for executing functions on the stack
  • [X] Drop function, for not executing functions on the stack
  • [X] Read-Eval-Print-Loop
  • [X] Ability to execute a file
  • [X] Comments. Can be nested.
  • [ ] User functions.
  • [ ] String Library for working with strings.
  • [ ] Help function
  • [ ] Interactive Tutorial function
  • [ ] Documentation

## Decisions to make:

  • [ ] Case insensitivity. Should Flang be case-sensitive or not?
  • [X] Indexing. Flang will be 1-indexed, to make new adoption easier.
  • [ ] User Functions. What kind of shape should these take? How could they be written?
  • [ ] Hash Table Type. Do we need it? How would it be used?
  • [ ] Mini-Stack Type. Do we need it? How would it be used? (Think Linked-List)
  • [ ] A library of tools for strings is needed. But, it needs to be defined.
  • [ ] Semantic Versioning. What API will be covered by semver?

## Install


This is alpha-software, and breaking is going to happen a lot.

The documentation that is vitally needed, isn’t anywhere near ready for the public.

Right… So, if you’re insisting on ignoring all that:

The latest release can be installed via pip:

pip install flang

Or, you can install from the git repository to get all the very latest changes:

git clone cd flang python3 install

## Usage

You can explore Flang in two ways:

If you have a file filled with Flang commands:

flang filename

Or, you can enter the interactive Read-Evaluate-Print Loop:

flang repl

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