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var keyCodes = { ESC: 27, backspace: 8, deleteKey: 46, enter: 13, space: 32, shiftKey: 16, f1: 112, f12: 123};
var keyNames = { 37: "left", 38: "up", 39: "right", 40: "down" }
// This is a mapping of the incorrect keyIdentifiers generated by Webkit on Windows during keydown events to
// the correct identifiers, which are correctly generated on Mac. We require this mapping to properly handle
// these keys on Windows. See https://bugs.webkit.org/show_bug.cgi?id=19906 for more details.
var keyIdentifierCorrectionMap = {
"U+00C0": ["U+0060", "U+007E"], // `~
"U+00BD": ["U+002D", "U+005F"], // -_
"U+00BB": ["U+003D", "U+002B"], // =+
"U+00DB": ["U+005B", "U+007B"], // [{
"U+00DD": ["U+005D", "U+007D"], // ]}
"U+00DC": ["U+005C", "U+007C"], // \|
"U+00BA": ["U+003B", "U+003A"], // ;:
"U+00DE": ["U+0027", "U+0022"], // '"
"U+00BC": ["U+002C", "U+003C"], // ,<
"U+00BE": ["U+002E", "U+003E"], // .>
"U+00BF": ["U+002F", "U+003F"] // /?
};
var platform;
if (navigator.userAgent.indexOf("Mac") != -1)
platform = "Mac";
else if (navigator.userAgent.indexOf("Linux") != -1)
platform = "Linux";
else
platform = "Windows";
function getKeyChar(event) {
// Not a letter
if (event.keyIdentifier.slice(0, 2) != "U+") {
// Named key
if (keyNames[event.keyCode]) {
return keyNames[event.keyCode];
}
// F-key
if (event.keyCode >= keyCodes.f1 && event.keyCode <= keyCodes.f12) {
return "f" + (1 + event.keyCode - keyCodes.f1);
}
return "";
}
var keyIdentifier = event.keyIdentifier;
// On Windows, the keyIdentifiers for non-letter keys are incorrect. See
// https://bugs.webkit.org/show_bug.cgi?id=19906 for more details.
if ((platform == "Windows" || platform == "Linux") && keyIdentifierCorrectionMap[keyIdentifier]) {
correctedIdentifiers = keyIdentifierCorrectionMap[keyIdentifier];
keyIdentifier = event.shiftKey ? correctedIdentifiers[1] : correctedIdentifiers[0];
}
var unicodeKeyInHex = "0x" + keyIdentifier.substring(2);
return String.fromCharCode(parseInt(unicodeKeyInHex)).toLowerCase();
}
function isPrimaryModifierKey(event) {
if (platform == "Mac")
return event.metaKey;
else
return event.ctrlKey;
}
function isEscape(event) {
return event.keyCode == keyCodes.ESC ||
(event.ctrlKey && getKeyChar(event) == '['); // c-[ is mapped to ESC in Vim by default.
}
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