DODO

DODO is a stack based retro-style programming language made by User:QuantumV inspired by FORTH, BASIC, etc.

(Almost) everything in this language is a number on the stack, except minor stuff like labels, variable storage, and DO

DO is used to execute every command because everything just pushes its opcode.

Notes

Strings

Strings work by first pushing 0 and then pushing themselves in reverse for convenient printing and such. So like reversed C Strings.

Buffers

Buffers are multiple ints enclosed by { (80) and } (81). When buffers are pushed by a variable, the brackets are excluded.

Instructions

Misc

Instruction	Opcode	Description
DO	N/A	Executes the top instruction on the stack. Technically is not an instruction
@NAME:	N/A	Creates a label with a name, no name is also valid. This has a separate pass so you can safely jump over it.
IMPORT	N/A	Replaces itself and the preceding string by the contents of the file pointed to by the string, relative to the location where the command is run. Falls back to the DODO lib folder if it cant find it.
;	N/A	Initializes a comment from this token to the end of the line, the comment is not tokenized.
VARIABLENAME	~	Pushes the value of the variable named, can push mutliple values.
NOP	0	Does nothing. At all.

Stack Ops

Instruction	Opcode	Description
DUP	1	Duplicate top value on the stack
POP	2	Discard top value on the stack
SWAP	3	Swap two top values on the stack
OVER	4	Push the value before the top value on the stack

Math Ops

B is the top of the stack, A is the element before the top

Instruction	Opcode	Description
+	10	Performs A + B
-	11	Performs A - B
*	12	Performs A * B
/	13	Performs A / B
%	14	Performs A % B
=	15	Checks if A is equal to B and pushes 1 if it is, and 0 if it isnt.
>	16	Checks if A is more than B and pushes 1 if it is, and 0 if it isnt.
<	17	Checks if A is less than B and pushes 1 if it is, and 0 if it isnt.

Var Ops

Instruction	Opcode	Description
SET	20	Sets a variable pointed to by the preceding string to a value. E.g. 10 "HI" SET
VAR	21	Initialize a numeric var. E.g. 10 "HI" VAR
ALIAS	22	Initialize a constant numeric var. E.g. 10 "HI" ALIAS
BUF	23	Initialize a buffer var that will push the contents of the buffer on use. E.g. { 1 2 3 4 } "HI" VAR
BUFALIAS	24	Initialize a constant buffer var that will push the contents of the buffer on use. E.g. { 1 2 3 4 } "HI" BUFALIAS
SETBUF	25	Sets a buffer variable. E.g. { 1 2 3 4 } "HI" SET
DEL	26	Permanently delete a variable or alias. This has no restrictions. E.g. "HI" DEL
GET	27	Pushes a variable value to the stack by name, useful for getting variables generated at runtime.

Jump Ops

Instruction	Opcode	Description
GOTO	40	Jumps to the label pointed to by the preceding string. E.g. "MYLABEL" GOTO
GOSUB	41	Jumps to a label, but also pushes the position to the call stack, so it can be returned to by...
RET	42	Jumps back to the caller
JZ	43	Jumps to a label, but only if the top of the stack is 0, also consumes it.
JNZ	44	Jumps to a label, but only if the top of the stack is 1, also consumes it.

I/O Ops

Instruction	Opcode	Description
OUTN	50	Output top value as a number
OUTC	51	Output top value as a character
OUTS	52	Output top value as a string
OUTB	53	Output top value as a buffer ( { 1, 2, 3, } )
INPUTS	54	Input value as a string
INPUTN	55	Input value as a number
INPUTC	56	Input value as a character

Time Ops

Instruction	Opcode	Description
SLEEP	60	Sleep for an amount of ms
TIME	61	Get unix time milliseconds

Default Consts

Const	Value	Description
{	80	Used for defining buffers
}	81	Ditto

Examples

Hello World

"Hello, World!" OUTS DO

Truth-machine

INPUTN DO
@LOOP:
DUP DO DUP DO
OUTN DO
"LOOP" JNZ DO

Fibonacci sequence

0 "A" VAR
1 "B" VAR
DO DO
@LOOP:
    B OUTN      DO
    A B +       DO
    B "A" SET   DO
      "B" SET   DO
    10 OUTC     DO
    "LOOP" GOTO DO 

Implementations

There is currently only one implementation, that being https://github.com/QuantumV2/dodo or https://codeberg.org/QuantumV/dodo on codeberg