"TOYS" Funge-98 Standard Toys

Fingerprint ID:0x544f5953

This fingerprint, from Cat’s Eye Technologies, implements a lot of “toy” commands, sometimes useful for Funge programming. It provides the following commands:

A : value n — value ... value

Pushes n copies of value. If n is not positive it does nothing.

B : b a — (a+b) (a-b)

Performs “butterfly” operation, originated from fast Fourier transform algorithms.

D : a — (a-1)

Decrements the top of stack.

E : ... — sum

Pops all cells from the stack and pushes their sum.

H : a b — (a shift b)

Pushes a shifted by b bits. If b is positive it shifts left, or it shifts right. In PyFunge left shift doesn’t overflow since the integer is arbitrary precision.

I : a — (a+1)

Increments the top of stack.

J : offset —

Moves the current column (cells with same X coordinate) up (negative offset) or down (positive offset).

L : — a

Pushes the value of cell at the left of IP. Here “left” means the next command to be executed if current command is [.

N : a — -a

Negates the top of stack.

O : offset —

Moves the current row (cells with same Y coordinate) left (negative offset) or right (positive offset).

P : ... — product

Pops all cells from the stack and pushes their product. Note that this ignores the implicit zeroes under the bottom of stack.

Q : a —

Sets the cell behind current IP to a.

R : — a

Pushes the value of cell at the right of IP. Here “right” means the next command to be executed if current command is ].

T : a dimension —

Changes delta to unit vector of given dimension if a is non-zero, or negate of unit vector if a is zero. In the other words 0T acts like _, 1T acts like | and 2T acts like m. Reflects if the invalid dimension is given.

U : —

Acts like ? and transmutes itself to the command which sets delta to changed value.

W : value target^v —

Pops the target vector and value. Then executes itself indefinitely (i.e. consuming ticks), until the target cell at target is not less than given value. Reflects if the cell is greater than given value. This command is useful for synchronization in Concurrent Funges.

X : —

Increments X coordinate of IP. Does not change the direction.

Y : —

Increments Y coordinate of IP. Does not change the direction.

Z : —

Increments Z coordinate of IP. Does not change the direction.

The following commands reflect in Unefunge and Trefunge mode. (These commands cannot be trivially extended to other dimensions.)

C : src^v size^v dest^v —

Pops three vectors and copies Funge space starting at src and which size is size into dest, in the coordinate-ascending order.

F : a_nm ... a₁₁ n m dest^v —

Pops one vector and two scalars. Then pops n by m cells and populates Funge space starting at dest with n rows and m columns, in the coordinate-ascending order.

G : n m src^v — a_nm ... a₁₁

Pops one vector and two scalars. Then pushes n by m cells from Funge space starting at dest with n rows and m columns, in the coordinate-ascending order.

K : src^v size^v dest^v —

Pops three vectors and copies Funge space starting at src and which size is size into dest, in the coordinate-descending order.

M : src^v size^v dest^v —

Pops three vectors and moves (i.e. copies and sets the original to whitespace) Funge space starting at src and which size is size into dest, in the coordinate-ascending order.

S : value size^v dest^v —

Pops two vectors and value, fills Funge space starting at dest and which size is size to value.

V : src^v size^v dest^v —

Pops three vectors and moves (i.e. copies and sets the original to whitespace) Funge space starting at src and which size is size into dest, in the coordinate-descending order.