Byte

{Number} ::= ['0'..'255']

Statement ::= ';' Instruction
            | '+' Instruction Statement
            | '-' Instruction Statement
            | ':' Number

Instruction ::= Number
              | Number ValArgument
              | Number VarArgument

ValArgument ::= '.' Number
VarArgument ::= ',' Number


Instructions:
0       Halt
1       Restart
2       Unconditional jump
3       Conditional jump (true)
4       Conditional jump (false)
5       Open variable for reading/writing
6       Set open variable value
7       Set array begin
8       Set array length
9       Open file for reading
10      Open file for writing
11      Input char
12      Output char
13      Read char from file
14      Write char to file