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qlb.js
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qlb.js
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var Qlb = {};
Qlb.Environment = function(table, outer) {
this.table = table
this.outer = outer
this.find = function (sym) { return this.table[sym] === undefined ? (this.outer ? this.outer.find(sym) : undefined) : this.table[sym] }
this.envForSym = function (sym) { return this.table[sym] === undefined ? (this.outer ? this.outer : undefined) : this }
this.merge = function(other) { for(var name in other) { Qlb.symbols[name] = true; this.table[name] = other[name] } }
};
Qlb.globalEnvironment = new Qlb.Environment({});
Qlb.symbols = {
"حرفي": true,
"إفعل": true,
"إذا": true,
"حدد": true,
"لامدا": true
};
Qlb.isSymbol = function(sym) {
return !!Qlb.symbols[sym];
};
Qlb.eval = function(exp, env) {
if(typeof exp == "string") { // evaling string/symbol
var sym = env.find(exp);
if(sym === undefined) return exp;
else return sym;
} else if(!(exp instanceof Array)) { // evaling literal
return exp;
} else { // evaling list
var first = exp[0]
var rest = exp.slice(1)
if(first == "حرفي") {
return rest
} else if(first == "إفعل") {
rest = run(rest, env);
return rest[rest.length - 1];
} else if(first == "إذا") {
var test = rest[0],
ifex = rest[1],
elex = rest[2]
return Qlb.eval(Qlb.eval(test, env) ? ifex : elex, env)
} else if(first == "حدد") {
var sym = rest[0],
val = rest[1]
return (env.table[sym] = Qlb.eval(val, env))
} else if(first == "عدل") {
var sym = rest[0],
val = rest[1]
if(env.envForSym(sym))
return (env.envForSym(sym).table[sym] = Qlb.eval(val, env));
return undefined;
} else if(first == "لامدا") {
var params = rest[0],
body = rest.slice(1)
return function() {
var table = {}
for (var i = 0; i < params.length; i++)
table[params[i]] = arguments[i]
return Qlb.eval(body, new Qlb.Environment(table, env))
}
} else {
var exps = run(exp, env);
if(typeof exps[0] == "function")
// first element evaluates to a function
return exps.shift().apply(this, exps)
else if(Qlb.isSymbol(exps[0])) {
throw new ReferenceError(exps[0]);
} else
// return last element
return exps[exps.length - 1];
}
}
};
function run(ast, env) {
try {
var val;
var ret = [];
for (var i = 0; i < ast.length; i++) {
val = Qlb.eval(ast[i], env);
ret.push(val);
};
return ret;
} catch(e) {
Qlb.handleUncaughtException(e);
}
}
Qlb.execute = function(code) {
try {
var ast = Qlb.parser.parse(code);
return run(ast, Qlb.globalEnvironment).pop();
} catch (e) {
Qlb.handleUncaughtException(e);
}
};
Qlb.handleUncaughtException = function(e) {
switch(e.name) {
case "SyntaxError":
Qlb.console.warn("خطأ: حرف '" + e.found + "' غير متوقع");
break;
case "ReferenceError":
Qlb.console.warn("خطأ: رمز '" + e.message + "' غير موجود");
break;
default:
throw e;
}
};
var global = this;
// Default console is window consle
Qlb.console = global.console;
// Default http adapter.
Qlb.http = {
// Warning this is a Sync AJAX request. It's good
// because async is contageois and would make the interpreter async.
// However this is bad in the main thread;
get: function (url) {
var xhr = new XMLHttpRequest();
xhr.open("GET", url, false);
xhr.send();
if (xhr.status === 200) {
return xhr.responseText;
} else {
// XXX: Better error handling.
Qlb.console.warn("خطأ: نص '" + url + "' غير موجود");
}
}
// implement other http methods?
};
Qlb.init = function (options) {
if (options.console) {
Qlb.console = options.console;
}
if (options.ajax) {
Qlb.ajax = options.ajax;
}
};