fix(compiler): support filters in attribute expressions

Fixes dart-archive#571

Author: pavelgj

lib/core_dom/block_factory.dart

@@ -99,6 +99,7 @@ class BlockFactory {
     assert((timerId = _perf.startTimer('ng.block.link.setUp', _html(node))) != false);
     Injector nodeInjector;
     Scope scope = parentInjector.get(Scope);
+    FilterMap filters = parentInjector.get(FilterMap);
     Map<Type, _ComponentFactory> fctrs;
     var nodeAttrs = node is dom.Element ? new NodeAttrs(node) : null;
     ElementProbe probe;
@@ -199,7 +200,7 @@ class BlockFactory {
         }
         if (nodeAttrs == null) nodeAttrs = new _AnchorAttrs(ref);
         for(var map in ref.mappings) {
-          map(nodeAttrs, scope, controller);
+          map(nodeAttrs, scope, controller, filters);
         }
         if (controller is NgAttachAware) {
           var removeWatcher;

lib/core_dom/common.dart

@@ -4,7 +4,7 @@ List<dom.Node> cloneElements(elements) {
   return elements.map((el) => el.clone(true)).toList();
 }
 
-typedef ApplyMapping(NodeAttrs attrs, Scope scope, Object dst);
+typedef ApplyMapping(NodeAttrs attrs, Scope scope, Object dst, FilterMap filters);
 
 class DirectiveRef {
   final dom.Node element;

lib/core_dom/compiler.dart

@@ -146,17 +146,17 @@ class Compiler {
       ApplyMapping mappingFn;
       switch (mode) {
         case '@':
-          mappingFn = (NodeAttrs attrs, Scope scope, Object dst) {
+          mappingFn = (NodeAttrs attrs, Scope scope, Object dst, FilterMap filters) {
             attrs.observe(attrName, (value) => dstPathFn.assign(dst, value));
           };
           break;
         case '<=>':
-          mappingFn = (NodeAttrs attrs, Scope scope, Object dst) {
+          mappingFn = (NodeAttrs attrs, Scope scope, Object dst, FilterMap filters) {
             if (attrs[attrName] == null) return;
             Expression attrExprFn = _parser(attrs[attrName]);
             var shadowValue = null;
             scope.$watch(
-                    () => attrExprFn.eval(scope),
+                    () => attrExprFn.eval(scope, filters),
                     (v) => dstPathFn.assign(dst, shadowValue = v),
                 attrs[attrName]);
             if (attrExprFn.isAssignable) {
@@ -173,22 +173,22 @@ class Compiler {
           };
           break;
         case '=>':
-          mappingFn = (NodeAttrs attrs, Scope scope, Object dst) {
+          mappingFn = (NodeAttrs attrs, Scope scope, Object dst, FilterMap filters) {
             if (attrs[attrName] == null) return;
             Expression attrExprFn = _parser(attrs[attrName]);
             scope.$watch(
-                    () => attrExprFn.eval(scope),
+                    () => attrExprFn.eval(scope, filters),
                     (v) => dstPathFn.assign(dst, v),
                     attrs[attrName]);
           };
           break;
         case '=>!':
-          mappingFn = (NodeAttrs attrs, Scope scope, Object dst) {
+          mappingFn = (NodeAttrs attrs, Scope scope, Object dst, FilterMap filters) {
             if (attrs[attrName] == null) return;
             Expression attrExprFn = _parser(attrs[attrName]);
             var stopWatching;
             stopWatching = scope.$watch(
-                () => attrExprFn.eval(scope),
+                () => attrExprFn.eval(scope, filters),
                 (value) {
                   if (dstPathFn.assign(dst, value) != null) {
                     stopWatching();
@@ -198,7 +198,7 @@ class Compiler {
           };
           break;
         case '&':
-          mappingFn = (NodeAttrs attrs, Scope scope, Object dst) {
+          mappingFn = (NodeAttrs attrs, Scope scope, Object dst, FilterMap filters) {
             dstPathFn.assign(dst, _parser(attrs[attrName]).bind(scope, ScopeLocals.wrapper));
           };
           break;

test/core_dom/compiler_spec.dart

@@ -180,6 +180,8 @@ main() => describe('dte.compiler', () {
         module.type(LogComponent);
         module.type(AttachDetachComponent);
         module.type(SimpleComponent);
+        module.type(ExprAttrComponent);
+        module.type(HelloFilter);
       }));
 
       it('should select on element', async(inject((NgZone zone) {
@@ -364,6 +366,16 @@ main() => describe('dte.compiler', () {
         }).toThrow("Unknown mapping 'foo\' for attribute 'attr'.");
       })));
 
+      it('should support filters in attribute expressions', async(inject(() {
+        var element = $(r'''<expr-attr-component expr="'Misko' | hello" one-way="'James' | hello" once="'Chirayu' | hello"></expr-attr-component>''');
+        $compile(element, directives)(injector, element);
+        ExprAttrComponent component = $rootScope['exprAttrComponent'];
+        $rootScope.$digest();
+        expect(component.expr).toEqual('Hello, Misko!');
+        expect(component.oneWay).toEqual('Hello, James!');
+        expect(component.exprOnce).toEqual('Hello, Chirayu!');
+      })));
+
       it('should error on non-asignable-mapping', async(inject(() {
         expect(() {
           var element = $(r'<div><non-assignable-mapping></non-assignable-mapping</div>');
@@ -787,3 +799,31 @@ class MissingSelector {}
 @NgComponent(selector: 'buttonbar button')
 class InvalidSelector {}
 
+@NgFilter(name:'hello')
+class HelloFilter {
+  call(String str) {
+    return 'Hello, $str!';
+  }
+}
+
+
+@NgComponent(
+    selector: 'expr-attr-component',
+    template: r'<content></content>',
+    publishAs: 'ctrl',
+    map: const {
+        'expr': '<=>expr',
+        'one-way': '=>oneWay',
+        'once': '=>!exprOnce'
+    }
+)
+class ExprAttrComponent {
+  var expr;
+  var oneWay;
+  var exprOnce;
+
+  ExprAttrComponent(Scope scope) {
+    scope.$root.exprAttrComponent = this;
+  }
+}
+