compiler for a concatenative programming language in python
write a plain number to push an integer to the stack
numbers can be normal integers, or they can be prefixed with 0b or 0B (binary numbers) or with 0x (hexadecimal)
to print a number from the top of the stack use the word print
20 print
// prints 20
to carry mathematical operations you have to firstly push some integers on the stack they tell it what to do
10 5 +
print
// prints 15
if statements are formed with if-end blocks
the if word will pop the first element from the stack and if that element is not zero it will execute the code
5 5 - if
10 print
end // this prints nothing as the first element on the stack was 0
while loops are formed with while-do-end blocks
while <condition> do
<body>
end
when you hit the while word it executes the code that is passed as the condition and when it hits the do word it removes the first element from the stack and if that element is not 0 it will execute the body
// print from 0-100
0 while 2dup 100 < do
print
1 +
end
// to print 100 write print but if you want up to 99 write drop so the last element that remains in the stack will be removed
drop
stack operations:
drop, it removes the element that is located on top of the stackdrop2, it removes the first two elements from the top of the stackdup, it duplicates the element on top of the stackdup2, it duplicates the element in top of the stack twiceswap, it swaps the first two elements from the stackclear, it clears the whole stack
you can set constants with the const word
const <name> <expresion> end
in the name field you add the name of the constant
the expression can be simple Corpe code that will be evaluated
const N 2 50 / 10 + end // this will evaluate 35
0 while dup N < do
dup print
1 +
end drop
to allocate some memory use the mem keyword
mem <name> <size> end
the size can even be a series of intstructions
mem X 10 5 + end
to access a part of that memory use mem-get
mem X 15 end
// <index-of-X> mem-get <memory-block>
0 mem-get X
// the returned value is pushed into the stack
to set a value in a memory block use mem-set
mem X 15 end
// <value> <index> mem-set <memory-block>
5 0 mem-set X
// and to show that it has changed
0 mem-get X print
to declare a variable use the var keyword
var x
to set the value of a variable use the set keyword
var x
5 set x
the set keyword expects one value at the stack
to get a variable value just type the name of the variable
var x
5 set x
x print
the default stack limit is 30k
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