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Port attrs.js back to Underscore

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This commit is contained in:
David Greenspan
2014-04-17 16:25:57 -07:00
parent 298e386aba
commit 57ccb51881
1 changed files with 8 additions and 47 deletions
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55
packages/ui/attrs.js
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@@ -36,45 +36,6 @@ AttributeHandler.prototype.update = function (element, oldValue, value) {
}
};
// _assign is like _.extend or the upcoming Object.assign.
// Copy src's own, enumerable properties onto tgt and return
// tgt.
var _assign = function (tgt, src) {
for (var k in src)
if (src.hasOwnProperty(k))
tgt[k] = src[k];
return tgt;
};
// return an array with the falsy elements removed
var _arrayCompact = function (array) {
var result = [];
for (var i = 0; i < array.length; i++) {
var item = array[i];
if (item)
result.push(item);
}
return result;
};
var _arrayContains = function (array, item) {
for (var i = 0; i < array.length; i++) {
if (array[i] === item)
return true;
}
return false;
};
var _arrayWithout = function (array, item) {
var result = [];
for (var i = 0; i < array.length; i++) {
var x = array[i];
if (x !== item)
result.push(x);
}
return result;
};
AttributeHandler.extend = function (options) {
var curType = this;
var subType = function AttributeHandlerSubtype(/*arguments*/) {
@@ -83,7 +44,7 @@ AttributeHandler.extend = function (options) {
subType.prototype = new curType;
subType.extend = curType.extend;
if (options)
_assign(subType.prototype, options);
_.extend(subType.prototype, options);
return subType;
};
@@ -93,22 +54,22 @@ var BaseClassHandler = AttributeHandler.extend({
if (!this.getCurrentValue || !this.setValue)
throw new Error("Missing methods in subclass of 'BaseClassHandler'");
var oldClasses = oldValue ? _arrayCompact(oldValue.split(' ')) : [];
var newClasses = value ? _arrayCompact(value.split(' ')) : [];
var oldClasses = oldValue ? _.compact(oldValue.split(' ')) : [];
var newClasses = value ? _.compact(value.split(' ')) : [];
// the current classes on the element, which we will mutate.
var classes = _arrayCompact(this.getCurrentValue(element).split(' '));
var classes = _.compact(this.getCurrentValue(element).split(' '));
// optimize this later (to be asymptotically faster) if necessary
for (var i = 0; i < oldClasses.length; i++) {
var c = oldClasses[i];
if (! _arrayContains(newClasses, c))
classes = _arrayWithout(classes, c);
if (! _.contains(newClasses, c))
classes = _.without(classes, c);
}
for (var i = 0; i < newClasses.length; i++) {
var c = newClasses[i];
if ((! _arrayContains(oldClasses, c)) &&
(! _arrayContains(classes, c)))
if ((! _.contains(oldClasses, c)) &&
(! _.contains(classes, c)))
classes.push(c);
}