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briancavalier/serialize-function.js

Created February 10, 2015 18:34
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  1. briancavalier created this gist Feb 10, 2015.
    35 changes: 35 additions & 0 deletions serialize-function.js
    View file
    Original file line number Diff line number Diff line change
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    var a = 123, b = 'hello';
    function test(x, y) {
    console.log(this);
    return a + x + b + y;
    }

    // Serialize a function *with its captured environment*
    var sf = serialize(test, { a: a, b: b });

    // Deserialize with captured environment
    var pf = parse(sf);

    // And call it
    console.log(pf(10, ', world'));

    function serialize(f, env) {
    return JSON.stringify({ src: f.toString(), env: env });
    }

    function parse(serialized) {
    var parsed = JSON.parse(serialized);
    return createFunction(parsed.src, parsed.env);
    }

    function createFunction(src, env) {
    return (new Function(createFunctionBody(src, env))(env));
    }

    function createFunctionBody(src, env) {
    return '"use strict";\n' + Object.keys(env).reduceRight(addVar, 'return ' + src + ';');
    }

    function addVar(s, k) {
    return 'var ' + k + ' = arguments[0].' + k + ';\n' + s;
    }