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#!/usr/bin/env ruby
# d20+1 # 20 1 d 1 + p
# 10d6k8 # 6 10 d 10 8 keep 8 .+ p
# 3d6>2 # 6 3 d 3 2 > p
# 3d12/2 # 12 3 d + + 2 / p
stack = []
loop do
print "> "
gets.split.each do |token|
case token
when /[0-9]+/
stack.push(token.to_i)
when "+"
a, b = stack.pop(2)
stack.push(a + b)
when ".+"
n = stack.pop
h = stack.pop(n)
stack.push(h.sum)
when "-"
a, b = stack.pop(2)
stack.push(a - b)
when "*"
a, b = stack.pop(2)
stack.push(a * b)
when "/"
a, b = stack.pop(2)
stack.push(a / b)
when "%"
a, b = stack.pop(2)
stack.push(a % b)
when "d", "roll"
n = stack.pop
d = stack.pop
n.times { stack.push(rand(d) + 1) }
when "p"
puts stack.pop
when "s"
puts stack.join(" ")
when "ex", "explode"
x = stack.pop
n = stack.pop
h = stack.pop(n)
lm = 0
loop do
m = h.count(x)
break if m == lm
(m-lm).times { h << (rand(x) + 1) }
lm = m
end
stack.push(*h)
when "k", "kh", "keep", "keephigh", "keephighest"
k = stack.pop
n = stack.pop
h = stack.pop(n).sort
stack.push(*h.pop(k))
when "kl", "keeplow", "keeplowest"
k = stack.pop
n = stack.pop
h = stack.pop(n).sort
stack.push(*h.shift(k))
when ">"
t = stack.pop
n = stack.pop
h = stack.pop(n)
stack.push(h.count{ |d| d > t })
when "<"
t = stack.pop
n = stack.pop
h = stack.pop(n)
stack.push(h.count{ |d| d < t })
when "!"
stack.pop
when ".!"
n = stack.pop
stack.pop(n)
when "q"
exit
else
puts "I don't know how to #{token}!"
end
end
end
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