P-Lang

P is a small (‘pequena’ in portuguese) functional programming language.

fib = [1| 1];
      [2| 1];
      [n| fib(n-1) + fib(n-2)]

fib(10)

Features

Functions:

fib = [1| 1];
      [2| 1];
      [n| fib(n-1) + fib(n-2)]

fib(10) # => 55

# or

fib = [1|1]
fib = [2|1]
fib = [n|fib(n-1)+fib(n-2)]

fib(10) # => 55

And more functions:

f = [x| x*pi] : (pi = 3.14)

f(1) # => 3.14

Wildcards

f = [1, _, x| x*2]

f(1,'aaaaa', 10) # => 20

Lists:

x = '(1,2,3,4)
x->head() # => 1
x->tail() # => '(2,3,4)

Objects:

{rectangle: 10, 30}

Pattern:

{rectangle: x, y} = {rectangle: 10, 30}
# => x = 10
# => y = 30

Messages:

{integer: x} -> plus2 = [x+2]

3->plus2() # => 5

IO:

x = read() # <= 123
print(x) # => 123

Requirements

• Ruby 1.9

Install

$ sudo gem install p-lang

Running

$ p-lang your-program.p

Interactive P Shell

$ p-lang

Note on Patches/Pull Requests

• Fork the project.

• Make your feature addition or bug fix.

• Add tests for it. This is important so I don’t break it in a future version unintentionally.

• Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)

• Send me a pull request. Bonus points for topic branches.

Copyright

Copyright © 2010 Ígor Bonadio. See LICENSE for details.