- Note that the Russian for Her is Её. Ее is not a valid name for the language.
Her, or YeYo, is an esoteric programming language for steganography created by User:Orisphera.
Input format
The program is a text written in Russian. The characters in the program that are important to the language (hereafter basic characters) are the letter Е (Ye) where Ё (Yo) would look innocent (hereafter 0) and Ё where Е would look innocent (hereafter 1). Other characters are only used to determine whether the other letter would look innocent and therefore whether to count it. The case of the letter, depending on the implementation of this part, is either ignored completely or used for the same, but either way, both uppercase and lowercase Е and Ё should count as long as the other letter of the same case would look innocent.
Commands
IMP
There are different types of commands in Her, and they all have different Instruction Modification Parameters (IMP).
You have to do IMP first, then command. The parameters end with a linefeed.
| IMP |
Command
|
| 00 |
Literals
|
| 011 |
I/O
|
| 100 |
Stack Manipulation
|
| 11 |
Arithmetic
|
| 010 |
Flow control
|
| 101 |
Heap access
|
Literals
In Her, you can only input numbers from 1 to 255 directly. To do so, first, write 00 to switch to literal mode. In literal mode, each command is 8 basic characters. It pushes the corresponding value (little-endian) to the stack. 00000000 exits the literal mode.
I/O
| Command |
Meaning
|
| 10 |
Read a character and put it on the stack
|
| 11 |
Read a number and put it on the stack (numbers inputted this way don't have to be in the range that literals have)
|
| 00 |
Pop a character and output it
|
| 01 |
Pop a number and output it
|
Basically, all you need to remember is first, 1 for input, 0 for output, and second, 0 for a character, 1 for a number.
Stack Manipulation
| Commands |
Meaning
|
| 10 |
Duplicate the top item on the stack
|
| 11 |
Swap the top two items on the stack
|
| 00 |
Discard the top item on the stack
|
| 010 |
Pop n. Then, copy the nth item on the stack onto the top of the stack
|
| 011 |
Pop n. Then, slide n items off the stack, keeping the top item
|
Arithmetic
| Command |
Meaning
|
| 00 |
Addition
|
| 01 |
Subtraction
|
| 10 |
Multiplication
|
| 110 |
Integer Division
|
| 111 |
Modulo
|
Flow control
| Commands |
Meaning
|
| 00<label> |
Mark a location in the program
|
| 011<label> |
Call a subroutine
|
| 010<label> |
Jump unconditionally to a label
|
| 100<label> |
Jump to a label if the top of the stack is zero
|
| 101<label> |
Jump to a label if the top of the stack is negative
|
| 110 |
End a subroutine and transfer control back to the caller
|
| 111 |
Ends the program
|
Heap Access
Heap access commands look at the stack to find the address of the items to be stored or retrieved. To store an item, push the address, then the value, and run the store command. To retrieve an item, push the address and run the retrieve command, which will place the value stored in the location at the top of the stack.
| Command |
Meaning
|
| 0 |
Store
|
| 1 |
Retrieve
|