PHP implementation of the Chicken VM, ported from JavaScript.
What is Chicken? It's a language based around one single symbol: chicken.
Actually, there are a few tokens: chicken, space and newline. The chicken
count of a line corresponds to an opcode.
It roughly translates into a form of assembly. The supported operations are
chicken (string), +, -, *, ==, load, store, jump, chars and literal
numbers.
The memory model has pointers to the stack itself and input as the first two elements of the stack. Those are followed by the opcodes, delimited by 0. The opcodes then run until the 0 is reached, at which point the head of the stack is returned. Every operation consumes one or more elements, then pushes its result onto the stack.
The reference implementation is written in JavaScript and is a piece of art.
Low-level chicken interpreter.
Quine:
$ echo chicken | bin/chicken
Cat:
$ echo chicken | bin/chicken foo <<EOF
chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken
chicken chicken chicken chicken chicken chicken
EOF
To enable debug logging of instructions and stack, pass the --debug option:
$ echo chicken | bin/chicken --debug
Eggsembler. Compiles down to chicken.
Print A:
$ (bin/eggsemble | bin/chicken) <<EOF
push 5
push 13
rooster
bbq
axe
EOF
Compiles ChickenASM to eggsembly.
Print A:
$ (bin/chickenasm | bin/eggsemble | bin/chicken) <<EOF
push 5
push 13
multiply
char
exit
EOF
Count:
$ cat examples/count.cha | bin/chickenasm | bin/eggsemble | bin/chicken 3
99 chickens:
$ cat examples/99chickens.cha | bin/chickenasm | bin/eggsemble | bin/chicken 9
ChickenASM is a different dialect of chicken assembly. This tool allows translating to eggsembly.