ЁЯРФ Chickenfoot is a two-dimensional programming language for chickens.
Inspired by a chicken tap dance with dominos:
тао тао
тао тал тао тал
та╖таИтазтай та╖таМтазтай
та╣ та╝ та╣
та╣ та╝ та╣
та╣ та╝ та╣
та┐та╜та╜та╜таШтаЛтаПтаатам таЪтаЛтаПтавтам
тал тао тал тао
талтап талтап
The program is equipped with four registers further referenced as r0, r1, r2, and r3. Each register holds an unbounded integer value.
The execution starts at the begin command and continues left-to-right as the default. The flow can be altered by the conditional branching command or by a handful of flow commands. In this way, loops can be created.
The program halts when a whitespace is read.
Each command consists of a single symbol of the Braille 6-dot patterns:
1 2
A o o
B o o
C o o
Braille symbols that do not fit any command definition and all other symbols are interpreted as whitespaces.
The begin command та┐ indicates the beginning of the program.
Each program must include exactly one begin command:
та┐
Except for the begin command, dots in the second column indicate the operation:
| Col | Rows | Operation | Precedence | Examples |
|---|---|---|---|---|
| 2 | A | Increment | 1 | таП, таЛ |
| 2 | C | Decrement | 1 | таз, таж |
| 2 | B | Conditional branching | 2 | таЯ, та╖ |
| 2 | A+C | Flow | 3 | та╜, тал |
Operations conditional branching and flow combine other dots as additional parameters.
For arithmetic commands increment, decrement, and the control flow command conditional branching, the number of dots in the first column indicates the index of a register to work with:
| Col | Number of dots | Register | Examples |
|---|---|---|---|
| 1 | 0 | r0 | таИ, таШ |
| 1 | 1 | r1 | таЙ, таЬ |
| 1 | 2 | r2 | таЛ, таЭ |
| 1 | 3 | r3 | таП, таЯ |
The vertical position of dots in the column is irrelevant and fully
aesthetics-driven. The following commands are equivalent:
таЛ, таН, таО.
The increment command increases the value of the selected register.
An example of incrementing r2 two times:
та┐таНтаЛ
The decrement command decreases the value of the selected register if its current value is greater than zero.
An example of decrementing r1 two times after incrementing it three times:
та┐таЙтаЙтаЙтабтав
Conditional branching changes the control flow based on the current value of the selected register. If the value equals zero, the flow branches; otherwise, it continues left-to-right.
The command always comes with another dot in the second row, which indicates the direction of the control flow in the case when the value of the selected register is equal to zero:
| Rows | Zero flow direction | Examples |
|---|---|---|
| B+A | Northeast (тЖЧ) | таЯ, таЩ |
| B+C | Southeast (тЖШ) | та╖, та▒ |
An example of setting r3 to one if r2 is greater than three:
та┐тагтагтагта│таП
The flow operation changes the control flow of the program.
The number of dots in the first column indicates the direction:
| Command | Flow direction |
|---|---|
тай |
North (тЖС) |
та╣ |
Northeast (тЖЧ) |
та╜ |
East (тЖТ) |
та╝ |
Southeast (тЖШ) |
там |
South (тЖУ) |
тао |
Southwest (тЖЩ) |
тап |
West (тЖР) |
тал |
Northwest (тЖЦ) |
A flow into the chicken hole:
та┐та╜та╜та╜та╜та╝
тал там
тай тао
талтаптаптап
The simplest valid program:
та┐
Don't try this at home!
та┐тап
If r0 contains 1, the program sets r1 to 1:
та┐та░таК
The program copies content of r0 to r1:
таотаптаптап
та┐та░таКтаНтаатай
та╝ таотаптап
та╡таИтагтай
The program takes an index in r0 and computes the corresponding Fibonacci number in r2:
тао
тао тал
та┐та░таЛтаатаШтаата│тагтаМтаПтал
тал та╝
тал та╝ таотап
тал та▓тавтаОтал
тал та╝
тал та╝ таотап
тал та╖тазтаМтал
талтаптап
An alternative version of a program which adds values in r0 and r1 to r2:
таЯтаЙтазтам
та╣ тао
та╣ талтаптап
та╣
таЪтаЛтаПтавтам
та╣ тао
та╣ талтаптаптап
та╣
таЯтаИтазтам
та╣ тао
та╣ талтаптап
та╣
та┐таШтаОтаПтаатам
тал тао
талтап
This repository contains a JavaScript interpreter for Chickenfoot.
npm i chickenfootIt takes source code as the first argument and optionally initial register values:
const chickenfoot = require('chickenfoot')
// addition of two numbers
const output = chickenfoot(`
тао тао
тао тал тао тал
та╖таИтазтай та╖таМтазтай
та╣ та╝ та╣
та╣ та╝ та╣
та╣ та╝ та╣
та┐таШтаЛтаПтаатам таЪтаЛтаПтавтам
тал тао тал тао
талтап талтап
`,
2, 3) // x=2, y=3
output[0] // 2 (x)
output[1] // 3 (y)
output[2] // 5 (x+y)
output[3] // 0Cascadia Code is the recommended code editor font for Chickenfoot.
npm test