An implementation of interaction nets as a forth-like concatenative programming language.
- ASCII art inspired syntax.
- Untyped, i.e. no static type checking.
- Using a concatenative stack-based low-layer language to build nets.
- Programming with interaction nets directly (no compilation via combinators).
( comment )
* (<name>) <inputs> -- <outputs> ( define node )
! (<name>)-(<name>) <program> ( define rule )
= <name> <program> ( define program )
. <program> ( run program )
full grammar
<inputs> := <ports>
<outputs> := <ports>
<ports> := <port> | <port> <ports>
<port> := <auxiliary-port> | <principle-port>
<auxiliary-port> := <name>
<principle-port> := <name>!
<program> := <word> | <word> <program>
<word> := <call> | <use-free-port> | <reconnect-free-port>
<call> := <name>
<use-free-port> := (<name>)-<name>
<reconnect-free-port> := <name>-(<name>)
<name> := <alphanumeric>Define nodes:
* (zero) -- value!
* (add1) prev -- value!
* (add) target! addend -- result
The rule between (zero) and (add) as ASCII art:
value value value
| | |
(add) => => |
/ \ \ \
(zero) addend addend addend
Define the rule between (zero) and (add):
! (zero)-(add)
(add)-addend result-(add)
Explanation of the above rule definition:
- Disconnect and delete
(zero)-(add). - Reconnect newly exposed wires:
(add)-addend- push the corresponding wire to the stack.
result-(add)- connect the corresponding wire with the wire on top of the stack.
The rule between (add1) and (add) as ASCII art:
value value value
| | |
(add) => => (add1)
/ \ \ |
(add1) addend addend (add)
| | / \
prev prev prev addend
Define the rule between (add1) and (add):
! (add1)-(add)
(add1)-prev (add)-addend add
add1 result-(add)
Explanation of the above rule definition:
- Disconnect and delete
(add1)-(add). - Reconnect newly exposed wires:
(add1)-prev(add)-addend- push the corresponding wire to the stack.
addadd1- create new node by applying it like a Forth function:
- wires from the stack and connect them to the node's input ports,
- then return free wires connected to the node's output ports.
- create new node by applying it like a Forth function:
result-(add)- connect the corresponding wire with the wire on top of the stack.
Example interaction:
| | | |
(add) (add1) (add1) (add1)
/ \ | | |
(add1) (add1) (add) (add1) (add1)
| | => / \ => | => |
(add1) (add1) (add1) (add1) (add) (add1)
| | | | / \ |
(zero) (zero) (zero) (add1) (zero) (add1) (add1)
| | |
(zero) (add1) (zero)
|
(zero)
The whole program with test:
* (zero) -- value!
* (add1) prev -- value!
* (add) target! addend -- result
! (zero)-(add)
(add)-addend result-(add)
! (add1)-(add)
(add1)-prev (add)-addend add
add1 result-(add)
( test )
. zero add1 add1
zero add1 add1
add
output
<net>
<root>
(add₇)-result-<>-
</root>
<body>
(add1₃)-value!-<>-!target-(add₇)
(add1₆)-value!-<>-addend-(add₇)
(add1₅)-value!-<>-prev-(add1₆)
(zero₄)-value!-<>-prev-(add1₅)
(add1₂)-value!-<>-prev-(add1₃)
(zero₁)-value!-<>-prev-(add1₂)
</body>
</net>
<net>
<root>
(add1₉)-value!-<>-
</root>
<body>
(add1₁₁)-value!-<>-prev-(add1₉)
(add1₆)-value!-<>-prev-(add1₁₁)
(add1₅)-value!-<>-prev-(add1₆)
(zero₄)-value!-<>-prev-(add1₅)
</body>
</net>* (null) -- value!
* (cons) tail head -- value!
* (append) target! rest -- result
! (null)-(append)
(append)-rest result-(append)
! (cons)-(append)
(cons)-tail (append)-rest append
(cons)-head cons result-(append)
( test )
* (sole) -- value!
. null sole cons sole cons sole cons
null sole cons sole cons sole cons
append
@wire/print-net
@interact
@wire/print-net
output
<net>
<root>
(append₁₅)-result-<>-
</root>
<body>
(cons₇)-value!-<>-!target-(append₁₅)
(cons₁₄)-value!-<>-rest-(append₁₅)
(cons₁₂)-value!-<>-tail-(cons₁₄)
(sole₁₃)-value!-<>-head-(cons₁₄)
(cons₁₀)-value!-<>-tail-(cons₁₂)
(sole₁₁)-value!-<>-head-(cons₁₂)
(null₈)-value!-<>-tail-(cons₁₀)
(sole₉)-value!-<>-head-(cons₁₀)
(cons₅)-value!-<>-tail-(cons₇)
(sole₆)-value!-<>-head-(cons₇)
(cons₃)-value!-<>-tail-(cons₅)
(sole₄)-value!-<>-head-(cons₅)
(null₁)-value!-<>-tail-(cons₃)
(sole₂)-value!-<>-head-(cons₃)
</body>
</net>
<net>
<root>
(cons₁₇)-value!-<>-
</root>
<body>
(cons₁₉)-value!-<>-tail-(cons₁₇)
(sole₆)-value!-<>-head-(cons₁₇)
(cons₂₁)-value!-<>-tail-(cons₁₉)
(sole₄)-value!-<>-head-(cons₁₉)
(cons₁₄)-value!-<>-tail-(cons₂₁)
(sole₂)-value!-<>-head-(cons₂₁)
(cons₁₂)-value!-<>-tail-(cons₁₄)
(sole₁₃)-value!-<>-head-(cons₁₄)
(cons₁₀)-value!-<>-tail-(cons₁₂)
(sole₁₁)-value!-<>-head-(cons₁₂)
(null₈)-value!-<>-tail-(cons₁₀)
(sole₉)-value!-<>-head-(cons₁₀)
</body>
</net>For more examples, please see the examples/ directory.
Compile:
git clone https://github.com/cicada-lang/inet
cd inet
make
make test
The compiled binary ./bin/inet is the command-line program.
$ ./bin/inet
inet 0.1.0
commands:
run -- run files, use --debug to see each step
help -- print help message
version -- print version
self-test -- run self testFor examples:
./bin/inet run examples/nat.inet
./bin/inet run examples/nat.inet --debugmake all # compile src/ files to lib/ and bin/
make run # compile and run the command-line program
make test # compile and run test
make clean # clean up compiled filesPapers:
Inspirations:
Books:
Tools:
To make a contribution, fork this project and create a pull request.
Please read the STYLE-GUIDE.md before you change the code.
Remember to add yourself to AUTHORS. Your line belongs to you, you can write a little introduction to yourself but not too long.