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(function(global) {
var recorded_xhr_events = [];
function record_xhr_event(e) {
var prefix = e.target instanceof XMLHttpRequestUpload ? "upload." : "";
recorded_xhr_events.push((prefix || "") + e.type + "(" + e.loaded + "," + e.total + "," + e.lengthComputable + ")");
}
global.prepare_xhr_for_event_order_test = function(xhr) {
xhr.addEventListener("readystatechange", function(e) {
recorded_xhr_events.push(xhr.readyState);
});
var events = ["loadstart", "progress", "abort", "timeout", "error", "load", "loadend"];
for(var i=0; i<events.length; ++i) {
xhr.addEventListener(events[i], record_xhr_event);
}
if ("upload" in xhr) {
for(var i=0; i<events.length; ++i) {
xhr.upload.addEventListener(events[i], record_xhr_event);
}
}
}
function getNextEvent(arr) {
var event = { str: arr.shift() };
// we can only handle strings, numbers (readystates) and undefined
if (event.str === undefined) {
return event;
}
if (typeof event.str !== "string") {
if (Number.isInteger(event.str)) {
event.state = event.str;
event.str = "readystatechange(" + event.str + ")";
} else {
throw "Test error: unexpected event type " + event.str;
}
}
// parse out the general type, loaded and total values
var type = event.type = event.str.split("(")[0].split(".").pop();
var loadedAndTotal = event.str.match(/.*\((\d+),(\d+),(true|false)\)/);
if (loadedAndTotal) {
event.loaded = parseInt(loadedAndTotal[1]);
event.total = parseInt(loadedAndTotal[2]);
event.lengthComputable = loadedAndTotal[3] == "true";
}
return event;
}
global.assert_xhr_event_order_matches = function(expected) {
var recorded = recorded_xhr_events;
var lastRecordedLoaded = -1;
while(expected.length && recorded.length) {
var currentExpected = getNextEvent(expected),
currentRecorded = getNextEvent(recorded);
// skip to the last progress event if we've hit one (note the next
// event after a progress event should be a LOADING readystatechange,
// if there are multiple progress events in a row).
while (recorded.length && currentRecorded.type == "progress" &&
parseInt(recorded) === 3) {
assert_greater_than(currentRecorded.loaded, lastRecordedLoaded,
"progress event 'loaded' values must only increase");
lastRecordedLoaded = currentRecorded.loaded;
}
if (currentRecorded.type == "loadend") {
recordedProgressCount = 0;
lastRecordedLoaded = -1;
}
assert_equals(currentRecorded.str, currentExpected.str);
}
if (recorded.length) {
throw "\nUnexpected extra events: " + recorded.join(", ");
}
if (expected.length) {
throw "\nExpected more events: " + expected.join(", ");
}
}
}(this));
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