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| /**
* @class core.func
*
* func utils (for high-order func's arg)
*
* @singleton
* @alternateClassName func
*/
function eq(itemA) {
return function(itemB) {
return itemA === itemB;
};
}
function eq2(itemA, itemB) {
return itemA === itemB;
}
function peq2(propName) {
return function(itemA, itemB) {
return itemA[propName] === itemB[propName];
};
}
function ok() {
return true;
}
function fail() {
return false;
}
function not(f) {
return () => {
return !f.apply(f, arguments);
};
}
function and(fA, fB) {
return function(item) {
return fA(item) && fB(item);
};
}
function self(a) {
return a;
}
function invoke(obj, method) {
return () => {
return obj[method].apply(obj, arguments);
};
}
let idCounter = 0;
/**
* generate a globally-unique id
*
* @param {String} [prefix]
*/
function uniqueId(prefix) {
const id = ++idCounter + '';
return prefix ? prefix + id : id;
}
/**
* returns bnd (bounds) from rect
*
* - IE Compatibility Issue: http://goo.gl/sRLOAo
* - Scroll Issue: http://goo.gl/sNjUc
*
* @param {Rect} rect
* @return {Object} bounds
* @return {Number} bounds.top
* @return {Number} bounds.left
* @return {Number} bounds.width
* @return {Number} bounds.height
*/
function rect2bnd(rect) {
const $document = $(document);
return {
top: rect.top + $document.scrollTop(),
left: rect.left + $document.scrollLeft(),
width: rect.right - rect.left,
height: rect.bottom - rect.top
};
}
/**
* returns a copy of the object where the keys have become the values and the values the keys.
* @param {Object} obj
* @return {Object}
*/
function invertObject(obj) {
const inverted = {};
for (const key in obj) {
Eif (obj.hasOwnProperty(key)) {
inverted[obj[key]] = key;
}
}
return inverted;
}
/**
* @param {String} namespace
* @param {String} [prefix]
* @return {String}
*/
function namespaceToCamel(namespace, prefix) {
prefix = prefix || '';
return prefix + namespace.split('.').map(function(name) {
return name.substring(0, 1).toUpperCase() + name.substring(1);
}).join('');
}
/**
* Returns a function, that, as long as it continues to be invoked, will not
* be triggered. The function will be called after it stops being called for
* N milliseconds. If `immediate` is passed, trigger the function on the
* leading edge, instead of the trailing.
* @param {Function} func
* @param {Number} wait
* @param {Boolean} immediate
* @return {Function}
*/
function debounce(func, wait, immediate) {
let timeout;
return () => {
const context = this;
const args = arguments;
const later = () => {
timeout = null;
Eif (!immediate) {
func.apply(context, args);
}
};
const callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
Iif (callNow) {
func.apply(context, args);
}
};
}
export default {
eq,
eq2,
peq2,
ok,
fail,
self,
not,
and,
invoke,
uniqueId,
rect2bnd,
invertObject,
namespaceToCamel,
debounce
};
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