123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377 |
- var FUNC_ERROR_TEXT = 'Expected a function';
- var NAN = 0 / 0;
- var symbolTag = '[object Symbol]';
- var reTrim = /^\s+|\s+$/g;
- var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
- var reIsBinary = /^0b[01]+$/i;
- var reIsOctal = /^0o[0-7]+$/i;
- var freeParseInt = parseInt;
- var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
- var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
- var root = freeGlobal || freeSelf || Function('return this')();
- var objectProto = Object.prototype;
- var objectToString = objectProto.toString;
- var nativeMax = Math.max,
- nativeMin = Math.min;
- var now = function() {
- return root.Date.now();
- };
- function debounce(func, wait, options) {
- var lastArgs,
- lastThis,
- maxWait,
- result,
- timerId,
- lastCallTime,
- lastInvokeTime = 0,
- leading = false,
- maxing = false,
- trailing = true;
- if (typeof func != 'function') {
- throw new TypeError(FUNC_ERROR_TEXT);
- }
- wait = toNumber(wait) || 0;
- if (isObject(options)) {
- leading = !!options.leading;
- maxing = 'maxWait' in options;
- maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
- trailing = 'trailing' in options ? !!options.trailing : trailing;
- }
- function invokeFunc(time) {
- var args = lastArgs,
- thisArg = lastThis;
- lastArgs = lastThis = undefined;
- lastInvokeTime = time;
- result = func.apply(thisArg, args);
- return result;
- }
- function leadingEdge(time) {
-
- lastInvokeTime = time;
-
- timerId = setTimeout(timerExpired, wait);
-
- return leading ? invokeFunc(time) : result;
- }
- function remainingWait(time) {
- var timeSinceLastCall = time - lastCallTime,
- timeSinceLastInvoke = time - lastInvokeTime,
- result = wait - timeSinceLastCall;
- return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result;
- }
- function shouldInvoke(time) {
- var timeSinceLastCall = time - lastCallTime,
- timeSinceLastInvoke = time - lastInvokeTime;
-
-
-
- return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
- (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
- }
- function timerExpired() {
- var time = now();
- if (shouldInvoke(time)) {
- return trailingEdge(time);
- }
-
- timerId = setTimeout(timerExpired, remainingWait(time));
- }
- function trailingEdge(time) {
- timerId = undefined;
-
-
- if (trailing && lastArgs) {
- return invokeFunc(time);
- }
- lastArgs = lastThis = undefined;
- return result;
- }
- function cancel() {
- if (timerId !== undefined) {
- clearTimeout(timerId);
- }
- lastInvokeTime = 0;
- lastArgs = lastCallTime = lastThis = timerId = undefined;
- }
- function flush() {
- return timerId === undefined ? result : trailingEdge(now());
- }
- function debounced() {
- var time = now(),
- isInvoking = shouldInvoke(time);
- lastArgs = arguments;
- lastThis = this;
- lastCallTime = time;
- if (isInvoking) {
- if (timerId === undefined) {
- return leadingEdge(lastCallTime);
- }
- if (maxing) {
-
- timerId = setTimeout(timerExpired, wait);
- return invokeFunc(lastCallTime);
- }
- }
- if (timerId === undefined) {
- timerId = setTimeout(timerExpired, wait);
- }
- return result;
- }
- debounced.cancel = cancel;
- debounced.flush = flush;
- return debounced;
- }
- function isObject(value) {
- var type = typeof value;
- return !!value && (type == 'object' || type == 'function');
- }
- function isObjectLike(value) {
- return !!value && typeof value == 'object';
- }
- function isSymbol(value) {
- return typeof value == 'symbol' ||
- (isObjectLike(value) && objectToString.call(value) == symbolTag);
- }
- function toNumber(value) {
- if (typeof value == 'number') {
- return value;
- }
- if (isSymbol(value)) {
- return NAN;
- }
- if (isObject(value)) {
- var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
- value = isObject(other) ? (other + '') : other;
- }
- if (typeof value != 'string') {
- return value === 0 ? value : +value;
- }
- value = value.replace(reTrim, '');
- var isBinary = reIsBinary.test(value);
- return (isBinary || reIsOctal.test(value))
- ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
- : (reIsBadHex.test(value) ? NAN : +value);
- }
- module.exports = debounce;
|