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VPL (Visual Programming Language)

Vandyhacks logo

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

-- 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

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