whitespace-language-converter

Provide a converter from our language to whitespace

Installation and Usage

Put to_ws.py to any location and type the following command

python to_ws.py readable.hws -o beautiful.ws

QuickStart

Put one command per line as follows:

push 5
push -2
add
printi
end

You can use labels if you want:

push 0
push 10
loop:
  dup
  push 0
  swap
  store
  swap
  push 0
  retrieve
  add
  swap
  push 1
  sub
  dup
  jz end
  jmp loop
end:
swap
printi
end

The above code calculates 10 + 9 + ... + 1 and output it.

Our Language

• push <n> (n: integer) Push n to the top of the stack.

• copy <n> Copy the n-th element from the top of the stack.

• slide <n> Discards the 2, 3, ..., (n+1)-th element from the top of the stack.

• printi Print the top of the stack as an integer and discard it.

• printc Print the top of the stack as an character and discard it.

• readc Read a character from stdin and store the address pointed by the top of the stack and discard it.

• readi Read an integer from stdin and store the address pointed by the top of the stack and discard it.

• dup Duplicate the top of the stack.

• swap Swap the top two elements of the stack.

• drop Discard the top of the stack.

• add Let X be the sum of the top two elements of the stack. Discard these two elements and push X.

• sub Let X be the second element minus the first element of the stack. Discard these two elements and push X.

• mul Let X be the first element multiplied by the second element of the stack. Discard these two elements and push X.

• div Let X be the floor of the second element divided by the first element of the stack. Discard these two elements and push X.

• mod Let X be the reminder of the second element divided by the first element of the stack. Discard these two elements and push X.

• store Store the top of the stack to the address pointed by the second element of the stack and discard them.

• retrieve Retrieve a value from the address pointed by the top of the stack, discard it and push the value.

• end Exit.

• <label>: Set a label.

• call <label> Call a subroutine starting from <label>.

• jmp <label> Jump to <label>.

• jz <label> Discard the top of the stack and if it's zero then jump to <label>.

• jn <label> Discard the top of the stack and if it's negative then jump to <label>.

• ret Exit the current subroutine.

• #... Comments.

• ... Indents.