How to provide compiler functionality to qtscript

[wysota]

A compiler does not check the semantics of the script. It is simply not possible for javascript. Consider this piece of code:

function fun(arg) { if(arg == 1) Array.prototype.foo = function() { return 7 } }
 
fun(userInput)
 
var x = Array.foo()

function fun(arg) { if(arg == 1) Array.prototype.foo = function() { return 7 } }

fun(userInput)

var x = Array.foo()

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Depending on the external value provided from "userInput" the foo method in Array will exist or not. The script syntax is fine but its semantics may vary between runs.

A compiler, by definition, is a tool that translates a high-level program definition into a lower-level program definition that is easier to execute by the runtime environment. For example a C compiler will not bail out if you divide by 0 in your application. The runtime will.