feat(ngPluralize): add alternative mapping using attributes

Add an alternative way to define a mapping for ng:pluralize using
attributes instead of the `when` attribute

Closes #2454

1 files changed, 10 insertions, 3 deletions

diff --git a/src/ng/directive/ngPluralize.js b/src/ng/directive/ngPluralize.js
index 6ab1e182..1cefc476 100644
--- a/src/ng/directive/ngPluralize.js
+++ b/src/ng/directive/ngPluralize.js
@@ -174,13 +174,20 @@ var ngPluralizeDirective = ['$locale', '$interpolate', function($locale, $interp
     restrict: 'EA',
     link: function(scope, element, attr) {
       var numberExp = attr.count,
-          whenExp = element.attr(attr.$attr.when), // this is because we have {{}} in attrs
+          whenExp = attr.$attr.when && element.attr(attr.$attr.when), // we have {{}} in attrs
           offset = attr.offset || 0,
-          whens = scope.$eval(whenExp),
+          whens = scope.$eval(whenExp) || {},
           whensExpFns = {},
           startSymbol = $interpolate.startSymbol(),
-          endSymbol = $interpolate.endSymbol();
+          endSymbol = $interpolate.endSymbol(),
+          isWhen = /^when(Minus)?(.+)$/;
 
+      forEach(attr, function(expression, attributeName) {
+        if (isWhen.test(attributeName)) {
+          whens[lowercase(attributeName.replace('when', '').replace('Minus', '-'))] =
+            element.attr(attr.$attr[attributeName]);
+        }
+      });
       forEach(whens, function(expression, key) {
         whensExpFns[key] =
           $interpolate(expression.replace(BRACE, startSymbol + numberExp + '-' +