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profiling.js
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profiling.js
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function profile (algorithm, profileName)
{
var s = "bazbarfoo";
console.profile(profileName);
for (var i = 1000; i--;)
{
algorithm(s);
}
console.profileEnd(profileName);
}
var tokens = [
{pattern: /foo/},
{pattern: /bar/, state: "bar"},
{pattern: /baz/, state: "S"}
];
var rx = new RegExp("(" + tokens.map(function (e) { return e.pattern.source; }).join(")|(") + ")", "g");
var global_tokens = tokens.map(function (e) {
return {pattern: new RegExp(e.pattern.source, "g"), state: e.state};
});
var l = tokens.length;
function compiled (s)
{
var state = null;
var m;
while ((m = rx.exec(s)))
{
for (var i = 0; i < l; ++i)
{
if (m[i + 1])
{
}
}
}
}
function iterative (s)
{
var last_index = 0;
do
{
var index = Infinity;
var used_m = null;
var used_rx = null;
for (var i = 0; i < l; ++i)
{
var rx = global_tokens[i].pattern;
rx.lastIndex = last_index;
var m = rx.exec(s);
if (m && m.index < index)
{
used_rx = rx;
used_m = m;
index = used_m.index;
}
}
if (used_m)
{
last_index = used_rx.lastIndex;
}
} while (used_m);
}
profile(compiled, "compiled");
profile(iterative, "iterative");