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browserUtil = {};
browserUtil.isNodeJS = (typeof(window) === 'undefined');
/**
* Pause (for the graphics to update and the script timer to clear), then run the
* specified action.
*/
browserUtil.pauseAndThen = function (cb) {
cb && window.setTimeout(cb, 1);
};
/**
* Iterate using continuation-passing style.
*/
browserUtil.cpsIterate = function (f, start, end, pause, callback) {
var pat = pause ? browserUtil.pauseAndThen : function (cb) { cb && cb(); };
function go() {
var called = false;
if (start >= end) {
pat(callback);
} else {
pat(function () { f(start, function () {
if (!called) { called = true; start++; go(); }
}); });
}
}
go (start);
};
/**
* Map a function over an array using continuation-passing style.
*/
browserUtil.cpsMap = function (map, list, pause, callback) {
browserUtil.cpsIterate(function (i, cb) { map(list[i], i, list.length, cb); },
0, list.length, pause, callback);
};
/** Cache for remotely loaded scripts. */
browserUtil.scriptCache = {};
/** Load several scripts, then call back */
browserUtil.loadScripts = function(scriptNames, cbSuccess, cbError) {
var head = document.getElementsByTagName('head')[0];
browserUtil.cpsMap(function (script, i, n, cb) {
var scriptE = document.createElement('script'), xhr, loaded = false;
browserUtil.status("Loading script " + script);
if (window.location.protocol === "file:") {
/* Can't make an AJAX request for files.
* But, we know the load time will be short, so timeout-based error
* detection is fine.
*/
scriptE.onload = function () {
loaded = true;
cb();
};
scriptE.onerror = function(err) {
cbError && cbError(script, err, cb);
};
script.onreadystatechange = function() {
if (this.readyState == 'complete' || this.readyState == 'loaded') {
loaded = true;
cb();
}
};
scriptE.type = 'text/javascript';
scriptE.src = script+"?"+(new Date().valueOf());
window.setTimeout(function () {
loaded || cbError && cbError(script, "timeout expired", cb);
}, 100);
head.appendChild(scriptE);
} else if (browserUtil.scriptCache[script] !== undefined) {
try {
scriptE.appendChild(document.createTextNode(browserUtil.scriptCache[script]));
} catch (e) {
scriptE.text = browserUtil.scriptCache[script];
}
head.appendChild(scriptE);
cb();
} else {
var xhr;
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest;
} else if (window.ActiveXObject) {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
if (xhr.status == 200) {
browserUtil.scriptCache[script] = xhr.responseText;
try {
scriptE.appendChild(document.createTextNode(xhr.responseText));
} catch (e) {
scriptE.text = xhr.responseText;
}
head.appendChild(scriptE);
cb();
} else {
cbError && cbError(script, xhr.status, cb);
}
}
};
xhr.open("GET", script+"?"+(new Date().valueOf()), true);
xhr.send();
}
}, scriptNames, false, cbSuccess);
};
/** Write a message to the console */
browserUtil.write = function(type, message) {
var d1 = document.getElementById("print"), d2 = document.createElement("div"), d3 = document.createElement("div");
d3.className = type;
d3.appendChild(document.createTextNode(message));
d2.appendChild(d3);
d1.appendChild(d2);
return { update: function (type2, message2) {
var d4 = document.createElement("div");
d4.className = type2 + " also";
d4.appendChild(document.createTextNode(message2));
d2.insertBefore(d4, d3);
}};
};
browserUtil.writeTable = function (headers) {
var d1 = document.getElementById("print"), d2 = document.createElement("table"), d3 = document.createElement("tr");
d2.className = 'table';
// write the headers
for (var i = 0; i < headers.length; i++) {
var header = document.createElement("th");
header.appendChild(document.createTextNode(headers[i]));
d3.appendChild(header);
}
d2.appendChild(d3);
d1.appendChild(d2);
return { update: function (row) {
var d4 = document.createElement("tr");
// write the rows
for (var i = 0; i < row.length; i++) {
var cell = document.createElement("td");
cell.appendChild(document.createTextNode(row[i]));
d4.appendChild(cell);
}
d2.appendChild(d4);
}};
};
/** Write a newline. Does nothing in the browser. */
browserUtil.writeNewline = function () { };
/** Write a message to the status line */
browserUtil.status = function(message) {
var d1 = document.getElementById("status");
d1.replaceChild(document.createTextNode(message), d1.firstChild);
};
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