https://github.com/siraben/vpl

VPL (Visual Programming Language) is an educational Turtle language using Haskell and Gloss
https://github.com/siraben/vpl

educational gloss haskell interpreter monad-transformers

Last synced: 3 months ago
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VPL (Visual Programming Language) is an educational Turtle language using Haskell and Gloss

• Host: GitHub
• URL: https://github.com/siraben/vpl
• Owner: siraben
• License: mit
• Created: 2019-11-02T20:10:12.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2023-01-15T01:04:40.000Z (about 2 years ago)
• Last Synced: 2024-10-08T14:20:30.733Z (4 months ago)
• Topics: educational, gloss, haskell, interpreter, monad-transformers
• Language: Haskell
• Homepage:
• Size: 682 KB
• Stars: 3
• Watchers: 5
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# VPL (Visual Programming Language)

![Vandyhacks logo](vandyhacks.png)

VPL is a language initially developed at VandyHacks 2019, aiming to be

a _LOGO_-like language for the 21st century.

## Features

- Haskell-like syntax, using Unicode characters `○●↻↺↑` for base

  commands

- Lexical scoping

- Control constructs

  - Bounded loops with `loop`

  - `if` statements

- Procedures can be defined that take several numerical argument, and

  must be called with the correct number of arguments

- A `main` procedure must be defined to run a VPL program

## Sample

```haskell

-- Go forward: ↑

-- Clockwise, anti-clockwise rotation: ↻ ↺

-- Pen up, pen down: ○ ●

right = [ ↻ 90 ]

left  = [ ↺ 90 ]

-- Draw a square

□ n = [ loop 4 [↑ n, right]]

-- Draw a triangle

△ n = [ ↻ 30, ↑ n, ↻ 120, ↑ n, ↻ 120, ↑ n, right ]

main = [ ●, △ 60, □ 60, right, □ 70, right, □ 80, ↑ 150,

         loop 100 [↑ 50, ↻ 59]]

```

The above code generates the following image:

![Sample image](sample.png)