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String.prototype.repeat = function(num) {
return new Array(num + 1).join(this);
}
function set_to_length(length, frag_size)
{
var fragment = "'" + "x".repeat(frag_size) + "' + ";
var frags = Math.floor((length - 1)/frag_size);
var code = "var x = " + fragment.repeat(frags) + "'" +
"x".repeat(length - frags * frag_size) + "';";
try {
eval(code);
}
catch(err) {
if (err.message && err.message == "Out of memory")
return -1;
if (err == "out of memory")
return -1;
throw(err); /* Oops, broke something. */
}
return code.length;
}
var first_fail;
var first_pass;
var frag_size;
var pass_code_length;
function search_up()
{
if (set_to_length(first_fail, frag_size) < 0) {
setTimeout(binary_search, 0);
return;
}
first_fail *= 2;
}
function binary_search()
{
if (first_fail - first_pass > 1) {
var length = (first_pass + first_fail) / 2;
var code_len = set_to_length(length, frag_size);
if (code_len > 0) {
first_pass = length;
pass_code_length = code_len;
} else
first_fail = length;
setTimeout(binary_search, 0);
return;
}
}
function run_find_limit()
{
frag_size = 64;
first_fail = 65536; /* A guess */
first_pass = 0;
pass_code_length = 0;
for (var i=0; i<5; i++)
search_up(0);
}
run_find_limit();