feat(filterFilter): allow overwriting the special $ property name

Previously, the special property name that would match against any
property was hard-coded to `$`.
With this commit, the user can specify an arbitrary property name,
by passing a 4th argument to `filterFilter()`. E.g.:

```js
var items = [{foo: 'bar'}, {baz: 'qux'}];
var expr  =  {'%': 'bar'};

console.log(filterFilter(items, expr, null, '%'));   // [{foo: 'bar'}]
```

Fixes #13313
PR (#13356)

src/ng/filter/filter.js

@@ -22,10 +22,11 @@
  *   - `Object`: A pattern object can be used to filter specific properties on objects contained
  *     by `array`. For example `{name:"M", phone:"1"}` predicate will return an array of items
  *     which have property `name` containing "M" and property `phone` containing "1". A special
- *     property name `$` can be used (as in `{$:"text"}`) to accept a match against any
- *     property of the object or its nested object properties. That's equivalent to the simple
- *     substring match with a `string` as described above. The predicate can be negated by prefixing
- *     the string with `!`.
+ *     property name (`$` by default) can be used (e.g. as in `{$: "text"}`) to accept a match
+ *     against any property of the object or its nested object properties. That's equivalent to the
+ *     simple substring match with a `string` as described above. The special property name can be
+ *     overwritten, using the `anyPropertyKey` parameter.
+ *     The predicate can be negated by prefixing the string with `!`.
  *     For example `{name: "!M"}` predicate will return an array of items which have property `name`
  *     not containing "M".
  *
@@ -59,6 +60,9 @@
  *     Primitive values are converted to strings. Objects are not compared against primitives,
  *     unless they have a custom `toString` method (e.g. `Date` objects).
  *
+ * @param {string=} anyPropertyKey The special property name that matches against any property.
+ *     By default `$`.
+ *
  * @example
    <example>
      <file name="index.html">
@@ -127,8 +131,9 @@
      </file>
    </example>
  */
+
 function filterFilter() {
-  return function(array, expression, comparator) {
+  return function(array, expression, comparator, anyPropertyKey) {
     if (!isArrayLike(array)) {
       if (array == null) {
         return array;
@@ -137,6 +142,7 @@ function filterFilter() {
       }
     }
 
+    anyPropertyKey = anyPropertyKey || '$';
     var expressionType = getTypeForFilter(expression);
     var predicateFn;
     var matchAgainstAnyProp;
@@ -153,7 +159,7 @@ function filterFilter() {
         //jshint -W086
       case 'object':
         //jshint +W086
-        predicateFn = createPredicateFn(expression, comparator, matchAgainstAnyProp);
+        predicateFn = createPredicateFn(expression, comparator, anyPropertyKey, matchAgainstAnyProp);
         break;
       default:
         return array;
@@ -164,8 +170,8 @@ function filterFilter() {
 }
 
 // Helper functions for `filterFilter`
-function createPredicateFn(expression, comparator, matchAgainstAnyProp) {
-  var shouldMatchPrimitives = isObject(expression) && ('$' in expression);
+function createPredicateFn(expression, comparator, anyPropertyKey, matchAgainstAnyProp) {
+  var shouldMatchPrimitives = isObject(expression) && (anyPropertyKey in expression);
   var predicateFn;
 
   if (comparator === true) {
@@ -193,25 +199,25 @@ function createPredicateFn(expression, comparator, matchAgainstAnyProp) {
 
   predicateFn = function(item) {
     if (shouldMatchPrimitives && !isObject(item)) {
-      return deepCompare(item, expression.$, comparator, false);
+      return deepCompare(item, expression[anyPropertyKey], comparator, anyPropertyKey, false);
     }
-    return deepCompare(item, expression, comparator, matchAgainstAnyProp);
+    return deepCompare(item, expression, comparator, anyPropertyKey, matchAgainstAnyProp);
   };
 
   return predicateFn;
 }
 
-function deepCompare(actual, expected, comparator, matchAgainstAnyProp, dontMatchWholeObject) {
+function deepCompare(actual, expected, comparator, anyPropertyKey, matchAgainstAnyProp, dontMatchWholeObject) {
   var actualType = getTypeForFilter(actual);
   var expectedType = getTypeForFilter(expected);
 
   if ((expectedType === 'string') && (expected.charAt(0) === '!')) {
-    return !deepCompare(actual, expected.substring(1), comparator, matchAgainstAnyProp);
+    return !deepCompare(actual, expected.substring(1), comparator, anyPropertyKey, matchAgainstAnyProp);
   } else if (isArray(actual)) {
     // In case `actual` is an array, consider it a match
     // if ANY of it's items matches `expected`
     return actual.some(function(item) {
-      return deepCompare(item, expected, comparator, matchAgainstAnyProp);
+      return deepCompare(item, expected, comparator, anyPropertyKey, matchAgainstAnyProp);
     });
   }
 
@@ -220,11 +226,11 @@ function deepCompare(actual, expected, comparator, matchAgainstAnyProp, dontMatc
       var key;
       if (matchAgainstAnyProp) {
         for (key in actual) {
-          if ((key.charAt(0) !== '$') && deepCompare(actual[key], expected, comparator, true)) {
+          if ((key.charAt(0) !== '$') && deepCompare(actual[key], expected, comparator, anyPropertyKey, true)) {
             return true;
           }
         }
-        return dontMatchWholeObject ? false : deepCompare(actual, expected, comparator, false);
+        return dontMatchWholeObject ? false : deepCompare(actual, expected, comparator, anyPropertyKey, false);
       } else if (expectedType === 'object') {
         for (key in expected) {
           var expectedVal = expected[key];
@@ -232,9 +238,9 @@ function deepCompare(actual, expected, comparator, matchAgainstAnyProp, dontMatc
             continue;
           }
 
-          var matchAnyProperty = key === '$';
+          var matchAnyProperty = key === anyPropertyKey;
           var actualVal = matchAnyProperty ? actual : actual[key];
-          if (!deepCompare(actualVal, expectedVal, comparator, matchAnyProperty, matchAnyProperty)) {
+          if (!deepCompare(actualVal, expectedVal, comparator, anyPropertyKey, matchAnyProperty, matchAnyProperty)) {
             return false;
           }
         }

test/ng/filter/filterSpec.js

@@ -192,6 +192,25 @@ describe('Filter: filter', function() {
   });
 
 
+  it('should allow specifying the special "match-all" property', function() {
+    var items = [
+      {foo: 'baz'},
+      {bar: 'baz'},
+      {'%': 'no dollar'}
+    ];
+
+    expect(filter(items, {$: 'baz'}).length).toBe(2);
+    expect(filter(items, {$: 'baz'}, null, '%').length).toBe(0);
+
+    expect(filter(items, {'%': 'dollar'}).length).toBe(1);
+    expect(filter(items, {$: 'dollar'}).length).toBe(1);
+    expect(filter(items, {$: 'dollar'}, null, '%').length).toBe(0);
+
+    expect(filter(items, {'%': 'baz'}).length).toBe(0);
+    expect(filter(items, {'%': 'baz'}, null, '%').length).toBe(2);
+  });
+
+
   it('should match any properties in the nested object for given deep "$" property', function() {
     var items = [{person: {name: 'Annet', email: 'annet@example.com'}},
                  {person: {name: 'Billy', email: 'me@billy.com'}},
@@ -425,6 +444,7 @@ describe('Filter: filter', function() {
       toThrowMinErr('filter', 'notarray', 'Expected array but received: {"toString":null,"valueOf":null}');
   });
 
+
   it('should not throw an error if used with an array like object', function() {
     function getArguments() {
       return arguments;
@@ -439,7 +459,6 @@ describe('Filter: filter', function() {
     expect(filter(argsObj, 'i').length).toBe(2);
     expect(filter('abc','b').length).toBe(1);
     expect(filter(nodeList, nodeFilterPredicate).length).toBe(1);
-
   });