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knockout-projections
============
Knockout.js observable arrays get smarter.
This plugin adds observable `map` and `filter` features to observable arrays, so you can transform collections in arbitrary ways and have the results automatically update whenever the underlying source data changes.
Installation
============
Download a copy of `knockout-projections-x.y.z.js` from [the `dist` directory](https://github.com/SteveSanderson/knockout-projections/tree/master/dist) and reference it in your web application:
<script src='knockout-x.y.z.js'></script> <!-- First reference KO itself -->
<script src='knockout-projections-x.y.z.js'></script> <!-- Then reference knockout-projections -->
Be sure to reference it *after* you reference Knockout itself, and of course replace `x.y.z` with the version number of the file you downloaded.
Usage
=====
**Mapping**
More info to follow. For now, here's a simple example:
var sourceItems = ko.observableArray([1, 2, 3, 4, 5]);
There's a plain observable array. Now let's say we want to keep track of the squares of these values:
var squares = sourceItems.map(function(x) { return x*x; });
Now `squares` is an observable array containing `[1, 4, 9, 16, 25]`. Let's modify the source data:
sourceItems.push(6);
// 'squares' has automatically updated and now contains [1, 4, 9, 16, 25, 36]
This works with any transformation of the source data, e.g.:
sourceItems.reverse();
// 'squares' now contains [36, 25, 16, 9, 4, 1]
The key point of this library is that these transformations are done *efficiently*. Specifically, your callback
function that performs the mapping is only called when strictly necessary (usually, that's only for newly-added
items). When you add new items to the source data, we *don't* need to re-map the existing ones. When you reorder
the source data, the output order is correspondingly changed *without* remapping anything.
This efficiency might not matter much if you're just squaring numbers, but when you are mapping complex nested
graphs of custom objects, it can be important to perform each mapping update with the minumum of work.
**Filtering**
As well as `map`, this plugin also provides `filter`:
var evenSquares = squares.filter(function(x) { return x % 2 === 0; });
// evenSquares is now an observable containing [36, 16, 4]
sourceItems.push(9);
// This has no effect on evenSquares, because 9*9=81 is odd
sourceItems.push(10);
// evenSquares now contains [36, 16, 4, 100]
Again, your `filter` callbacks are only called when strictly necessary. Re-ordering or deleting source items don't
require any refiltering - the output is simply updated to match. Only newly-added source items must be subjected
to your `filter` callback.
**Chaining**
The above code also demonstrates that you can chain together successive `map` and `filter` transformations.
When the underlying data changes, the effects will ripple out through the chain of computed arrays with the
minimum necessary invocation of your `map` and `filter` callbacks.
How to build from source
========================
First, install [NPM](https://npmjs.org/) if you don't already have it. It comes with Node.js.
Second, install Grunt globally, if you don't already have it:
npm install -g grunt-cli
Third, use NPM to download all the dependencies for this module:
cd wherever_you_cloned_this_repo
npm install
Now you can build the package (linting and running tests along the way):
grunt
Or you can just run the linting tool and tests:
grunt test
Or you can make Grunt watch for changes to the sources/specs and auto-rebuild after each change:
grunt watch
The browser-ready output files will be dumped at the following locations:
* `dist/knockout-projections.js`
* `dist/knockout-projections.min.js`
License - Apache 2.0
====================
Copyright (c) Microsoft Corporation
All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.
See the Apache Version 2.0 License for specific language governing permissions and limitations under the License.

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/*! Knockout projections plugin
------------------------------------------------------------------------------
Copyright (c) Microsoft Corporation
All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.
See the Apache Version 2.0 License for specific language governing permissions and limitations under the License.
------------------------------------------------------------------------------
*/
(function(global, undefined) {
'use strict';
var exclusionMarker = {};
function StateItem(ko, inputItem, initialStateArrayIndex, initialOutputArrayIndex, mapping, arrayOfState, outputObservableArray) {
// Capture state for later use
this.inputItem = inputItem;
this.stateArrayIndex = initialStateArrayIndex;
this.mapping = mapping;
this.arrayOfState = arrayOfState;
this.outputObservableArray = outputObservableArray;
this.outputArray = this.outputObservableArray.peek();
this.isIncluded = null; // Means 'not yet determined'
this.suppressNotification = false; // TODO: Instead of this technique, consider raising a sparse diff with a "mutated" entry when a single item changes, and not having any other change logic inside StateItem
// Set up observables
this.outputArrayIndex = ko.observable(initialOutputArrayIndex); // When excluded, it's the position the item would go if it became included
this.mappedValueComputed = ko.computed(this.mappingEvaluator, this);
this.mappedValueComputed.subscribe(this.onMappingResultChanged, this);
this.previousMappedValue = this.mappedValueComputed.peek();
}
StateItem.prototype.dispose = function() {
this.mappedValueComputed.dispose();
};
StateItem.prototype.mappingEvaluator = function() {
var mappedValue = this.mapping(this.inputItem, this.outputArrayIndex),
newInclusionState = mappedValue !== exclusionMarker;
// Inclusion state changes can *only* happen as a result of changing an individual item.
// Structural changes to the array can't cause this (because they don't cause any remapping;
// they only map newly added items which have no earlier inclusion state to change).
if (this.isIncluded !== newInclusionState) {
if (this.isIncluded !== null) { // i.e., not first run
this.moveSubsequentItemsBecauseInclusionStateChanged(newInclusionState);
}
this.isIncluded = newInclusionState;
}
return mappedValue;
};
StateItem.prototype.onMappingResultChanged = function(newValue) {
if (newValue !== this.previousMappedValue) {
if (this.isIncluded) {
this.outputArray.splice(this.outputArrayIndex.peek(), 1, newValue);
}
if (!this.suppressNotification) {
this.outputObservableArray.valueHasMutated();
}
this.previousMappedValue = newValue;
}
};
StateItem.prototype.moveSubsequentItemsBecauseInclusionStateChanged = function(newInclusionState) {
var outputArrayIndex = this.outputArrayIndex.peek(),
iterationIndex,
stateItem;
if (newInclusionState) {
// Shift all subsequent items along by one space, and increment their indexes.
// Note that changing their indexes might cause remapping, but won't affect their
// inclusion status (by definition, inclusion status must not be affected by index,
// otherwise you get undefined results) so there's no risk of a chain reaction.
this.outputArray.splice(outputArrayIndex, 0, null);
for (iterationIndex = this.stateArrayIndex + 1; iterationIndex < this.arrayOfState.length; iterationIndex++) {
stateItem = this.arrayOfState[iterationIndex];
stateItem.setOutputArrayIndexSilently(stateItem.outputArrayIndex.peek() + 1);
}
} else {
// Shift all subsequent items back by one space, and decrement their indexes
this.outputArray.splice(outputArrayIndex, 1);
for (iterationIndex = this.stateArrayIndex + 1; iterationIndex < this.arrayOfState.length; iterationIndex++) {
stateItem = this.arrayOfState[iterationIndex];
stateItem.setOutputArrayIndexSilently(stateItem.outputArrayIndex.peek() - 1);
}
}
};
StateItem.prototype.setOutputArrayIndexSilently = function(newIndex) {
// We only want to raise one output array notification per input array change,
// so during processing, we suppress notifications
this.suppressNotification = true;
this.outputArrayIndex(newIndex);
this.suppressNotification = false;
};
function getDiffEntryPostOperationIndex(diffEntry, editOffset) {
// The diff algorithm's "index" value refers to the output array for additions,
// but the "input" array for deletions. Get the output array position.
if (!diffEntry) { return null; }
switch (diffEntry.status) {
case 'added':
return diffEntry.index;
case 'deleted':
return diffEntry.index + editOffset;
default:
throw new Error('Unknown diff status: ' + diffEntry.status);
}
}
function insertOutputItem(ko, diffEntry, movedStateItems, stateArrayIndex, outputArrayIndex, mapping, arrayOfState, outputObservableArray, outputArray) {
// Retain the existing mapped value if this is a move, otherwise perform mapping
var isMoved = typeof diffEntry.moved === 'number',
stateItem = isMoved ?
movedStateItems[diffEntry.moved] :
new StateItem(ko, diffEntry.value, stateArrayIndex, outputArrayIndex, mapping, arrayOfState, outputObservableArray);
arrayOfState.splice(stateArrayIndex, 0, stateItem);
if (stateItem.isIncluded) {
outputArray.splice(outputArrayIndex, 0, stateItem.mappedValueComputed.peek());
}
// Update indexes
if (isMoved) {
// We don't change the index until *after* updating this item's position in outputObservableArray,
// because changing the index may trigger re-mapping, which in turn would cause the new
// value to be written to the 'index' position in the output array
stateItem.stateArrayIndex = stateArrayIndex;
stateItem.setOutputArrayIndexSilently(outputArrayIndex);
}
return stateItem;
}
function deleteOutputItem(diffEntry, arrayOfState, stateArrayIndex, outputArrayIndex, outputArray) {
var stateItem = arrayOfState.splice(stateArrayIndex, 1)[0];
if (stateItem.isIncluded) {
outputArray.splice(outputArrayIndex, 1);
}
if (typeof diffEntry.moved !== 'number') {
// Be careful to dispose only if this item really was deleted and not moved
stateItem.dispose();
}
}
function updateRetainedOutputItem(stateItem, stateArrayIndex, outputArrayIndex) {
// Just have to update its indexes
stateItem.stateArrayIndex = stateArrayIndex;
stateItem.setOutputArrayIndexSilently(outputArrayIndex);
// Return the new value for outputArrayIndex
return outputArrayIndex + (stateItem.isIncluded ? 1 : 0);
}
function makeLookupOfMovedStateItems(diff, arrayOfState) {
// Before we mutate arrayOfComputedMappedValues at all, grab a reference to each moved item
var movedStateItems = {};
for (var diffIndex = 0; diffIndex < diff.length; diffIndex++) {
var diffEntry = diff[diffIndex];
if (diffEntry.status === 'added' && (typeof diffEntry.moved === 'number')) {
movedStateItems[diffEntry.moved] = arrayOfState[diffEntry.moved];
}
}
return movedStateItems;
}
function getFirstModifiedOutputIndex(firstDiffEntry, arrayOfState, outputArray) {
// Work out where the first edit will affect the output array
// Then we can update outputArrayIndex incrementally while walking the diff list
if (!outputArray.length || !arrayOfState[firstDiffEntry.index]) {
// The first edit is beyond the end of the output or state array, so we must
// just be appending items.
return outputArray.length;
} else {
// The first edit corresponds to an existing state array item, so grab
// the first output array index from it.
return arrayOfState[firstDiffEntry.index].outputArrayIndex.peek();
}
}
function respondToArrayStructuralChanges(ko, inputObservableArray, arrayOfState, outputArray, outputObservableArray, mapping) {
return inputObservableArray.subscribe(function(diff) {
if (!diff.length) {
return;
}
var movedStateItems = makeLookupOfMovedStateItems(diff, arrayOfState),
diffIndex = 0,
diffEntry = diff[0],
editOffset = 0, // A running total of (num(items added) - num(items deleted)) not accounting for filtering
outputArrayIndex = diffEntry && getFirstModifiedOutputIndex(diffEntry, arrayOfState, outputArray);
// Now iterate over the state array, at each stage checking whether the current item
// is the next one to have been edited. We can skip all the state array items whose
// indexes are less than the first edit index (i.e., diff[0].index).
for (var stateArrayIndex = diffEntry.index; diffEntry || (stateArrayIndex < arrayOfState.length); stateArrayIndex++) {
// Does the current diffEntry correspond to this position in the state array?
if (getDiffEntryPostOperationIndex(diffEntry, editOffset) === stateArrayIndex) {
// Yes - insert or delete the corresponding state and output items
switch (diffEntry.status) {
case 'added':
// Add to output, and update indexes
var stateItem = insertOutputItem(ko, diffEntry, movedStateItems, stateArrayIndex, outputArrayIndex, mapping, arrayOfState, outputObservableArray, outputArray);
if (stateItem.isIncluded) {
outputArrayIndex++;
}
editOffset++;
break;
case 'deleted':
// Just erase from the output, and update indexes
deleteOutputItem(diffEntry, arrayOfState, stateArrayIndex, outputArrayIndex, outputArray);
editOffset--;
stateArrayIndex--; // To compensate for the "for" loop incrementing it
break;
default:
throw new Error('Unknown diff status: ' + diffEntry.status);
}
// We're done with this diff entry. Move on to the next one.
diffIndex++;
diffEntry = diff[diffIndex];
} else if (stateArrayIndex < arrayOfState.length) {
// No - the current item was retained. Just update its index.
outputArrayIndex = updateRetainedOutputItem(arrayOfState[stateArrayIndex], stateArrayIndex, outputArrayIndex);
}
}
outputObservableArray.valueHasMutated();
}, null, 'arrayChange');
}
// Mapping
function observableArrayMap(ko, mapping) {
var inputObservableArray = this,
arrayOfState = [],
outputArray = [],
outputObservableArray = ko.observableArray(outputArray),
originalInputArrayContents = inputObservableArray.peek();
// Initial state: map each of the inputs
for (var i = 0; i < originalInputArrayContents.length; i++) {
var inputItem = originalInputArrayContents[i],
stateItem = new StateItem(ko, inputItem, i, outputArray.length, mapping, arrayOfState, outputObservableArray),
mappedValue = stateItem.mappedValueComputed.peek();
arrayOfState.push(stateItem);
if (stateItem.isIncluded) {
outputArray.push(mappedValue);
}
}
// If the input array changes structurally (items added or removed), update the outputs
var inputArraySubscription = respondToArrayStructuralChanges(ko, inputObservableArray, arrayOfState, outputArray, outputObservableArray, mapping);
// Return value is a readonly computed which can track its own changes to permit chaining.
// When disposed, it cleans up everything it created.
var returnValue = ko.computed(outputObservableArray).extend({ trackArrayChanges: true }),
originalDispose = returnValue.dispose;
returnValue.dispose = function() {
inputArraySubscription.dispose();
ko.utils.arrayForEach(arrayOfState, function(stateItem) {
stateItem.dispose();
});
originalDispose.call(this, arguments);
};
// Make projections chainable
addProjectionFunctions(ko, returnValue);
return returnValue;
}
// Filtering
function observableArrayFilter(ko, predicate) {
return observableArrayMap.call(this, ko, function(item) {
return predicate(item) ? item : exclusionMarker;
});
}
// Attaching projection functions
// ------------------------------
//
// Builds a collection of projection functions that can quickly be attached to any object.
// The functions are predefined to retain 'this' and prefix the arguments list with the
// relevant 'ko' instance.
var projectionFunctionsCacheName = '_ko.projections.cache';
function attachProjectionFunctionsCache(ko) {
// Wraps callback so that, when invoked, its arguments list is prefixed by 'ko' and 'this'
function makeCaller(ko, callback) {
return function() {
return callback.apply(this, [ko].concat(Array.prototype.slice.call(arguments, 0)));
};
}
ko[projectionFunctionsCacheName] = {
map: makeCaller(ko, observableArrayMap),
filter: makeCaller(ko, observableArrayFilter)
};
}
function addProjectionFunctions(ko, target) {
ko.utils.extend(target, ko[projectionFunctionsCacheName]);
return target; // Enable chaining
}
// Module initialisation
// ---------------------
//
// When this script is first evaluated, it works out what kind of module loading scenario
// it is in (Node.js or a browser `<script>` tag), and then attaches itself to whichever
// instance of Knockout.js it can find.
function attachToKo(ko) {
ko.projections = {
_exclusionMarker: exclusionMarker
};
attachProjectionFunctionsCache(ko);
addProjectionFunctions(ko, ko.observableArray.fn); // Make all observable arrays projectable
}
// Determines which module loading scenario we're in, grabs dependencies, and attaches to KO
function prepareExports() {
if (typeof module !== 'undefined') {
// Node.js case - load KO synchronously
var ko = require('knockout');
attachToKo(ko);
module.exports = ko;
} else if ('ko' in global) {
// Non-module case - attach to the global instance
attachToKo(global.ko);
}
}
prepareExports();
})(this);

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/*! Knockout projections plugin
------------------------------------------------------------------------------
Copyright (c) Microsoft Corporation
All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.
See the Apache Version 2.0 License for specific language governing permissions and limitations under the License.
------------------------------------------------------------------------------
*/
!function(a){"use strict";function b(a,b,c,d,e,f,g){this.inputItem=b,this.stateArrayIndex=c,this.mapping=e,this.arrayOfState=f,this.outputObservableArray=g,this.outputArray=this.outputObservableArray.peek(),this.isIncluded=null,this.suppressNotification=!1,this.outputArrayIndex=a.observable(d),this.mappedValueComputed=a.computed(this.mappingEvaluator,this),this.mappedValueComputed.subscribe(this.onMappingResultChanged,this),this.previousMappedValue=this.mappedValueComputed.peek()}function c(a,b){if(!a)return null;switch(a.status){case"added":return a.index;case"deleted":return a.index+b;default:throw new Error("Unknown diff status: "+a.status)}}function d(a,c,d,e,f,g,h,i,j){var k="number"==typeof c.moved,l=k?d[c.moved]:new b(a,c.value,e,f,g,h,i);return h.splice(e,0,l),l.isIncluded&&j.splice(f,0,l.mappedValueComputed.peek()),k&&(l.stateArrayIndex=e,l.setOutputArrayIndexSilently(f)),l}function e(a,b,c,d,e){var f=b.splice(c,1)[0];f.isIncluded&&e.splice(d,1),"number"!=typeof a.moved&&f.dispose()}function f(a,b,c){return a.stateArrayIndex=b,a.setOutputArrayIndexSilently(c),c+(a.isIncluded?1:0)}function g(a,b){for(var c={},d=0;d<a.length;d++){var e=a[d];"added"===e.status&&"number"==typeof e.moved&&(c[e.moved]=b[e.moved])}return c}function h(a,b,c){return c.length&&b[a.index]?b[a.index].outputArrayIndex.peek():c.length}function i(a,b,i,j,k,l){return b.subscribe(function(b){if(b.length){for(var m=g(b,i),n=0,o=b[0],p=0,q=o&&h(o,i,j),r=o.index;o||r<i.length;r++)if(c(o,p)===r){switch(o.status){case"added":var s=d(a,o,m,r,q,l,i,k,j);s.isIncluded&&q++,p++;break;case"deleted":e(o,i,r,q,j),p--,r--;break;default:throw new Error("Unknown diff status: "+o.status)}n++,o=b[n]}else r<i.length&&(q=f(i[r],r,q));k.valueHasMutated()}},null,"arrayChange")}function j(a,c){for(var d=this,e=[],f=[],g=a.observableArray(f),h=d.peek(),j=0;j<h.length;j++){var k=h[j],l=new b(a,k,j,f.length,c,e,g),n=l.mappedValueComputed.peek();e.push(l),l.isIncluded&&f.push(n)}var o=i(a,d,e,f,g,c),p=a.computed(g).extend({trackArrayChanges:!0}),q=p.dispose;return p.dispose=function(){o.dispose(),a.utils.arrayForEach(e,function(a){a.dispose()}),q.call(this,arguments)},m(a,p),p}function k(a,b){return j.call(this,a,function(a){return b(a)?a:p})}function l(a){function b(a,b){return function(){return b.apply(this,[a].concat(Array.prototype.slice.call(arguments,0)))}}a[q]={map:b(a,j),filter:b(a,k)}}function m(a,b){return a.utils.extend(b,a[q]),b}function n(a){a.projections={_exclusionMarker:p},l(a),m(a,a.observableArray.fn)}function o(){if("undefined"!=typeof module){var b=require("knockout");n(b),module.exports=b}else"ko"in a&&n(a.ko)}var p={};b.prototype.dispose=function(){this.mappedValueComputed.dispose()},b.prototype.mappingEvaluator=function(){var a=this.mapping(this.inputItem,this.outputArrayIndex),b=a!==p;return this.isIncluded!==b&&(null!==this.isIncluded&&this.moveSubsequentItemsBecauseInclusionStateChanged(b),this.isIncluded=b),a},b.prototype.onMappingResultChanged=function(a){a!==this.previousMappedValue&&(this.isIncluded&&this.outputArray.splice(this.outputArrayIndex.peek(),1,a),this.suppressNotification||this.outputObservableArray.valueHasMutated(),this.previousMappedValue=a)},b.prototype.moveSubsequentItemsBecauseInclusionStateChanged=function(a){var b,c,d=this.outputArrayIndex.peek();if(a)for(this.outputArray.splice(d,0,null),b=this.stateArrayIndex+1;b<this.arrayOfState.length;b++)c=this.arrayOfState[b],c.setOutputArrayIndexSilently(c.outputArrayIndex.peek()+1);else for(this.outputArray.splice(d,1),b=this.stateArrayIndex+1;b<this.arrayOfState.length;b++)c=this.arrayOfState[b],c.setOutputArrayIndexSilently(c.outputArrayIndex.peek()-1)},b.prototype.setOutputArrayIndexSilently=function(a){this.suppressNotification=!0,this.outputArrayIndex(a),this.suppressNotification=!1};var q="_ko.projections.cache";o()}(this);

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{
"name": "knockout-projections",
"version": "1.0.0",
"description": "Knockout.js observable arrays get smarter",
"main": "knockout-projections.js",
"directories": {
"test": "test"
},
"dependencies": {
"knockout": "~3.0.0",
"jasmine-reporters": "~0.2.1"
},
"devDependencies": {
"grunt": "~0.4.1",
"grunt-contrib-jshint": "~0.4.3",
"grunt-contrib-uglify": "~0.2.0",
"grunt-contrib-concat": "~0.3.0",
"grunt-contrib-watch": "~0.4.3",
"grunt-jasmine-node": "~0.1.0"
},
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"repository": "",
"author": "Microsoft Corporation",
"licenses" : [
{ "type" : "Apache 2.0", "url" : "http://www.apache.org/licenses/LICENSE-2.0.html" }
]
}