feat(ChangeDetector): implement enabling/disabling records

modules/change_detection/src/change_detector.js

@@ -1,6 +1,6 @@
 import {ProtoWatchGroup, WatchGroup} from './watch_group';
 import {ProtoRecord, Record} from './record';
-import {FIELD, int} from 'facade/lang';
+import {FIELD, int, isPresent} from 'facade/lang';
 export * from './record';
 export * from './watch_group'
 
@@ -12,11 +12,10 @@ export class ChangeDetector {
   }
 
   detectChanges():int {
-    var record:Record = this._rootWatchGroup.headRecord;
     var count:int = 0;
-    for (record = this._rootWatchGroup.headRecord;
-         record != null;
-         record = record.next) {
+    for (var record = this._rootWatchGroup.headEnabledRecord;
+         isPresent(record);
+         record = record.nextEnabled) {
       if (record.check()) {
         count++;
       }

modules/change_detection/src/record.js

@@ -65,6 +65,12 @@ export class Record {
   @FIELD('final protoRecord:ProtoRecord')
   @FIELD('next:Record')
   @FIELD('prev:Record')
+
+  /// This reference can change.
+  @FIELD('nextEnabled:Record')
+
+  /// This reference can change.
+  @FIELD('prevEnabled:Record')
   @FIELD('dest:Record')
 
   @FIELD('previousValue')
@@ -86,6 +92,9 @@ export class Record {
 
     this.next = null;
     this.prev = null;
+    this.nextEnabled = null;
+    this.prevEnabled = null;
+    this.disabled = false;
     this.dest = null;
 
     this.previousValue = null;
@@ -163,9 +172,11 @@ export class Record {
         return FunctionWrapper.apply(this.context, this.args);
 
       case MODE_STATE_INVOKE_PURE_FUNCTION:
+        this.watchGroup.disableRecord(this);
         return FunctionWrapper.apply(this.funcOrValue, this.args);
 
       case MODE_STATE_CONST:
+        this.watchGroup.disableRecord(this);
         return this.funcOrValue;
 
       case MODE_STATE_MARKER:
@@ -184,10 +195,12 @@ export class Record {
 
   updateArg(value, position:int) {
     this.args[position] = value;
+    this.watchGroup.enableRecord(this);
   }
 
   updateContext(value) {
     this.context = value;
+    this.watchGroup.enableRecord(this);
   }
 }
 

modules/change_detection/src/watch_group.js

@@ -56,21 +56,11 @@ export class ProtoWatchGroup {
   }
 
   _createRecords(watchGroup:WatchGroup, formatters:Map) {
-    var tail, prevRecord;
-    watchGroup.headRecord = tail = new Record(watchGroup, this.headRecord, formatters);
-    this.headRecord.recordInConstruction = watchGroup.headRecord;
-
-    for (var proto = this.headRecord.next; proto != null; proto = proto.next) {
-      prevRecord = tail;
-
-      tail = new Record(watchGroup, proto, formatters);
-      proto.recordInConstruction = tail;
-
-      tail.prev = prevRecord;
-      prevRecord.next = tail;
+    for (var proto = this.headRecord; proto != null; proto = proto.next) {
+      var record = new Record(watchGroup, proto, formatters);
+      proto.recordInConstruction = record;
+      watchGroup.addRecord(record);
     }
-
-    watchGroup.tailRecord = tail;
   }
 
   _setDestination() {
@@ -95,9 +85,70 @@ export class WatchGroup {
     this.dispatcher = dispatcher;
     this.headRecord = null;
     this.tailRecord = null;
+    this.headEnabledRecord = null;
+    this.tailEnabledRecord = null;
     this.context = null;
   }
 
+  addRecord(record:Record) {
+    if (isPresent(this.tailRecord)) {
+      this.tailRecord.next = record;
+      this.tailRecord.nextEnabled = record;
+      record.prev = this.tailRecord;
+      record.prevEnabled = this.tailRecord;
+      this.tailRecord = this.tailEnabledRecord = record;
+
+    } else {
+      this.headRecord = this.tailRecord = record;
+      this.headEnabledRecord = this.tailEnabledRecord = record;
+    }
+  }
+
+  disableRecord(record:Record) {
+    var prev = record.prevEnabled;
+    var next = record.nextEnabled;
+
+    record.disabled = true;
+
+    if (isPresent(prev)) {
+      prev.nextEnabled = next;
+    } else {
+      this.headEnabledRecord = next;
+    }
+
+    if (isPresent(next)) {
+      next.prevEnabled = prev;
+    } else {
+      this.tailEnabledRecord = prev;
+    }
+  }
+
+  enableRecord(record:Record) {
+    if (!record.disabled) return;
+
+    var prev = record.prev;
+    while (prev != null && prev.disabled) prev = prev.prev;
+
+    var next = record.next;
+    while (next != null && next.disabled) next = next.next;
+
+    record.disabled = false;
+    record.prevEnabled = prev;
+    record.nextEnabled = next;
+
+    if (isPresent(prev)) {
+      prev.nextEnabled = record;
+    } else {
+      this.headEnabledRecord = record;
+    }
+
+    if (isPresent(next)) {
+      next.prevEnabled = record;
+    } else {
+      this.tailEnabledRecord = record;
+    }
+  }
+
   insertChildGroup(newChild:WatchGroup, insertAfter:WatchGroup) {
     throw 'not implemented';
   }

modules/change_detection/test/change_detector_spec.js

@@ -152,13 +152,36 @@ export function main() {
         expect(executeWatch('m', '1 > 2 ? 1 : 2')).toEqual(['m=2']);
       });
 
-      it("should support formatters", () => {
-        var formatters = MapWrapper.createFromPairs([
-          ["uppercase", (v) => v.toUpperCase()],
-          ["wrap", (v, before, after) => `${before}${v}${after}`]
-        ]);
-        expect(executeWatch('str', '"aBc" | uppercase', null, formatters)).toEqual(['str=ABC']);
-        expect(executeWatch('str', '"b" | wrap:"a":"c"', null, formatters)).toEqual(['str=abc']);
+      describe("formatters", () => {
+        it("should support formatters", () => {
+          var formatters = MapWrapper.createFromPairs([
+            ['uppercase', (v) => v.toUpperCase()],
+            ['wrap', (v, before, after) => `${before}${v}${after}`]]);
+          expect(executeWatch('str', '"aBc" | uppercase', null, formatters)).toEqual(['str=ABC']);
+          expect(executeWatch('str', '"b" | wrap:"a":"c"', null, formatters)).toEqual(['str=abc']);
+        });
+
+        it("should rerun formatters only when arguments change", () => {
+          var counter = 0;
+          var formatters = MapWrapper.createFromPairs([
+            ['formatter', (_) => {counter += 1; return 'value'}]
+          ]);
+
+          var person = new Person('Jim');
+
+          var c = createChangeDetector('formatter', 'name | formatter', person, formatters);
+          var cd = c['changeDetector'];
+
+          cd.detectChanges();
+          expect(counter).toEqual(1);
+
+          cd.detectChanges();
+          expect(counter).toEqual(1);
+
+          person.name = 'bob';
+          cd.detectChanges();
+          expect(counter).toEqual(2);
+        });
       });
     });
   });

modules/change_detection/test/watch_group_spec.js

@@ -0,0 +1,126 @@
+import {ddescribe, describe, it, iit, xit, expect} from 'test_lib/test_lib';
+
+import {List, ListWrapper, MapWrapper} from 'facade/collection';
+import {Parser} from 'change_detection/parser/parser';
+import {Lexer} from 'change_detection/parser/lexer';
+import {ClosureMap} from 'change_detection/parser/closure_map';
+
+import {
+  ChangeDetector,
+  ProtoWatchGroup,
+  WatchGroup,
+  WatchGroupDispatcher,
+  ProtoRecord
+} from 'change_detection/change_detector';
+
+import {Record} from 'change_detection/record';
+
+export function main() {
+  function createRecord(wg) {
+    return new Record(wg, new ProtoRecord(null, null, null, null, null), null);
+  }
+
+  describe('watch group', () => {
+    describe("adding records", () => {
+      it("should add a record", () => {
+        var wg = new WatchGroup(null, null);
+        var record = createRecord(wg);
+
+        wg.addRecord(record);
+
+        expect(wg.headRecord).toBe(record);
+        expect(wg.tailRecord).toBe(record);
+        expect(wg.headEnabledRecord).toBe(record);
+        expect(wg.tailEnabledRecord).toBe(record);
+      });
+
+      it("should add multiple records", () => {
+        var wg = new WatchGroup(null, null);
+        var record1 = createRecord(wg);
+        var record2 = createRecord(wg);
+
+        wg.addRecord(record1);
+        wg.addRecord(record2);
+
+        expect(wg.headRecord).toBe(record1);
+        expect(wg.tailRecord).toBe(record2);
+
+        expect(wg.headEnabledRecord).toBe(record1);
+        expect(wg.tailEnabledRecord).toBe(record2);
+
+        expect(record1.next).toBe(record2);
+        expect(record2.prev).toBe(record1);
+      });
+    });
+
+    describe("enabling/disabling records", () => {
+      it("should disable a single record", () => {
+        var wg = new WatchGroup(null, null);
+        var record = createRecord(wg);
+        wg.addRecord(record);
+
+        wg.disableRecord(record);
+
+        expect(wg.headEnabledRecord).toBeNull();
+        expect(wg.tailEnabledRecord).toBeNull();
+      });
+
+      it("should enable a single record", () => {
+        var wg = new WatchGroup(null, null);
+        var record = createRecord(wg);
+        wg.addRecord(record);
+        wg.disableRecord(record);
+
+        wg.enableRecord(record);
+
+        expect(wg.headEnabledRecord).toBe(record);
+        expect(wg.tailEnabledRecord).toBe(record);
+      });
+
+      it("should disable a record", () => {
+        var wg = new WatchGroup(null, null);
+        var record1 = createRecord(wg);
+        var record2 = createRecord(wg);
+        var record3 = createRecord(wg);
+        var record4 = createRecord(wg);
+        wg.addRecord(record1);
+        wg.addRecord(record2);
+        wg.addRecord(record3);
+        wg.addRecord(record4);
+
+        wg.disableRecord(record2);
+        wg.disableRecord(record3);
+
+        expect(record2.disabled).toBeTruthy();
+
+        expect(wg.headEnabledRecord).toBe(record1);
+        expect(wg.tailEnabledRecord).toBe(record4);
+
+        expect(record1.nextEnabled).toBe(record4);
+        expect(record4.prevEnabled).toBe(record1);
+      });
+
+      it("should enable a record", () => {
+        var wg = new WatchGroup(null, null);
+        var record1 = createRecord(wg);
+        var record2 = createRecord(wg);
+        var record3 = createRecord(wg);
+        var record4 = createRecord(wg);
+        wg.addRecord(record1);
+        wg.addRecord(record2);
+        wg.addRecord(record3);
+        wg.addRecord(record4);
+        wg.disableRecord(record2);
+        wg.disableRecord(record3);
+
+        wg.enableRecord(record2);
+        wg.enableRecord(record3);
+
+        expect(record1.nextEnabled).toBe(record2);
+        expect(record2.nextEnabled).toBe(record3);
+        expect(record3.nextEnabled).toBe(record4);
+        expect(record4.prevEnabled).toBe(record3);
+      });
+    })
+  });
+}