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hatch's Introduction

"hatch" -- an implementation of programming language "egg"

"hatch" is an implementation of programming language "egg". Programming language "egg" is designed by Y. HAYAMIZU for the exercise of an university class.

"hatch" consists of following three modules:

  • parser ... parse an egg program
  • translator ... compile an egg program into VM byte code
  • VM ... execute VM byte code

Egg sample code

bind foo -> 1;
print(foo); # prints "1"
bind fib -> lambda (n) { # lambda generates a function (or closure)
  if n <= 0
    0
  eles if n = 1
    1
  else
    fib(n - 1) + fib(n - 2)
};

puts(fib(10));
let Y -> lambda (f) { # You can construct Y-combinator! Yeah!
  (lambda (proc) {
    f(lambda (arg) { (proc(proc))(arg) })
  })(lambda (proc) {
    f(lambda (arg) { (proc(proc))(arg) })
  })
}
in
let fact0 -> lambda (f) {
  lambda (n) {
    if (n = 0)  1
    else        n * f(n - 1)
  }
}
in
let fact -> Y(fact0)
in
  puts(fact(10))

hatch's People

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