Koume
Koume is a programming language described by JSON.
Koume has features as follows.
- first class functions and anonymous functions
- first class continuations
- tail recursion optimization
- LISP like macros
- message passing mechanism
How to use
node.js
Install Koume:
npm install koume
Use module:
var Koume = require('koume');
Browser
<script src="koume.js"></script>
Command Line
$ koume [-n] program.json
Examples
Literals
[ 765 ]
[ true ]
[ false ]
[ null ]
Apply to function
Quotes
[ { "q": "string" } ]
[ { "q": [ "array" ] } ]
[ { "q": { "obj1": 1 } } ]
Quasiquotes
[
{
"qq": {
"obj1": {
"uq": [ "add", 765, 346 ]
}
}
}
]
Functions
[
{
"define": {
"square": {
"function": {
"args": ["x"],
"begin": [
["mul", "x", "x"]
]
}
}
}
}
]
Conditions
[
{
"if": {
"cond": true,
"then": 1,
"else": 2
}
}
]
Loop (named let)
[
{
"let": {
"name": "sum",
"vars": {
"x": 10,
"y": 0
},
"begin": [
{
"if": {
"cond": ["eqv", "x", 0],
"then": "y",
"else": ["sum", ["sub", "x", 1], ["add", "x", "y"]]
}
}
]
}
}
]
Continuations
[
{
"define": {
"s": null
}
},
[
"add",
346,
[
"callcc",
{
"function": {
"args": ["k"],
"begin": [
{
"set": { "s": "k" }
},
961
]
}
}
]
],
["s", 765]
]
Macros
[
{
"defmacro": {
"name": "aMacro",
"patterns": [
{
"pattern": {
"obj1": "a"
},
"begin": [
{
"qq": ["list", { "uq": "a" }]
}
]
}
]
}
},
{
"aMacro": {
"obj1": 1
}
}
]
Message passing
[
{
"define": {
"class": {
"function": {
"args": ["x"],
"begin": [
{
"message": {
"extends": false,
"messages": {
"add": {
"function": {
"args": ["y"],
"begin": [
["add", "x", "y"]
]
}
}
}
}
}
]
}
}
}
},
{
"define": {
"obj": ["class", 765]
}
},
[["obj", { "q": "add" }], 346]
]
Document
A document of Koume is here (Japanese).