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rated 0 times [  97] [ 2]  / answers: 1 / hits: 19727  / 16 Years ago, thu, february 12, 2009, 12:00:00

I have a javascript file that reads another file which may contain javascript fragments that need to be eval()-ed. The script fragments are supposed to conform to a strict subset of javascript that limits what they can do and which variables they can change, but I want to know if there is some way to enforce this by preventing the eval from seeing variables in the global scope. Something like the following:

function safeEval( fragment )
var localVariable = g_Variable;

// do magic scoping here so that the eval fragment can see localVariable
// but not g_Variable or anything else outside function scope

eval( fragment );

The actual code doesn't need to look like this--I'm open to any and all weird tricks with closures, etc. But I do want to know if this is even possible.

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