Given StringMap.js and atLeastFreeNames.js from SES, one can define
the following:
// Public domain
var serialize = function s(f) {
// Find free vars in f. (This depends, of course, on
// Function.prototype.toString being unchanged.)
var source = f.toString();
var free = ses.atLeastFreeVarNames(source);
var result = ["({"];
for (var i = 0, len = free.length; i < len; ++i) {
result.push('"');
result.push(free[i]);
result.push('":(function(){try{return eval("(');
result.push(free[i]);
result.push(')")}catch(_){return {}}})()');
result.push(',');
}
result.pop();
result.push("})");
return "[" + JSON.stringify(source) + "," + result.join("") + "]";
};
// See https://gist.github.com/Hoff97/9842228 or
// http://jsfiddle.net/7UYd4/1/
// for versions of stringify that handle cycles
var t = JSON.stringify;
var d = function (env) {
return function() {
with(env[1]){
return eval("("+env[0]+")").apply(this, arguments);
}
};
};
Then you can use these definitions with inline function expressions:
var baz = {x: 1};
var serializedEnv = t(eval(s(
function bar(foo) { return ++(baz.x)+foo /*fiddle*/; }
)));
The string serializedEnv can be stashed somewhere. When it's time to
deserialize, do the following:
var env = eval(serializedEnv);
// Hook up local values if you want them
env[1].console = console;
var deserializedFn = d(env, localBindings);
--
Mike Stay - [email protected]
http://www.cs.auckland.ac.nz/~mike
http://reperiendi.wordpress.com
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