angular-cn/modules/change_detection/test/change_detector_spec.js

import {ddescribe, describe, it, iit, xit, expect} from 'test_lib/test_lib';

import {isPresent} from 'facade/lang';
import {List, ListWrapper, MapWrapper} from 'facade/collection';
import {ContextWithVariableBindings} from 'change_detection/parser/context_with_variable_bindings';
import {Parser} from 'change_detection/parser/parser';
import {Lexer} from 'change_detection/parser/lexer';

import {
  ChangeDetector,
  ProtoRecordRange,
  RecordRange,
  WatchGroupDispatcher,
  ProtoRecord
} from 'change_detection/change_detector';

import {Record} from 'change_detection/record';

export function main() {
  function ast(exp:string) {
    var parser = new Parser(new Lexer());
    return parser.parseBinding(exp).ast;
  }

  function createChangeDetector(memo:string, exp:string, context = null, formatters = null) {
    var prr = new ProtoRecordRange();
    prr.addRecordsFromAST(ast(exp), memo, false);

    var dispatcher = new LoggingDispatcher();
    var rr = prr.instantiate(dispatcher, formatters);
    rr.setContext(context);

    var cd = new ChangeDetector(rr);

    return {"changeDetector" : cd, "dispatcher" : dispatcher};
  }

  function executeWatch(memo:string, exp:string, context = null, formatters = null) {
    var res = createChangeDetector(memo, exp, context, formatters);
    res["changeDetector"].detectChanges();
    return res["dispatcher"].log;
  }

  describe('change_detection', () => {
    describe('ChangeDetection', () => {
      it('should do simple watching', () => {
        var person = new Person("misko");

        var c = createChangeDetector('name', 'name', person);
        var cd = c["changeDetector"];
        var dispatcher = c["dispatcher"];

        cd.detectChanges();
        expect(dispatcher.log).toEqual(['name=misko']);

        dispatcher.clear();
        cd.detectChanges();
        expect(dispatcher.log).toEqual([]);

        person.name = "Misko";
        cd.detectChanges();
        expect(dispatcher.log).toEqual(['name=Misko']);
      });

      it('should support chained properties', () => {
        var address = new Address('Grenoble');
        var person = new Person('Victor', address);

        expect(executeWatch('address.city', 'address.city', person))
              .toEqual(['address.city=Grenoble']);
      });

      it("should support method calls", () => {
        var person = new Person('Victor');
        expect(executeWatch('m', 'sayHi("Jim")', person)).toEqual(['m=Hi, Jim']);
      });

      it("should support function calls", () => {
        var td = new TestData(() => (a) => a);
        expect(executeWatch('value', 'a()(99)', td)).toEqual(['value=99']);
      });

      it("should support chained method calls", () => {
        var person = new Person('Victor');
        var td = new TestData(person);
        expect(executeWatch('m', 'a.sayHi("Jim")', td)).toEqual(['m=Hi, Jim']);
      });

      it("should support literals", () => {
        expect(executeWatch('const', '10')).toEqual(['const=10']);
        expect(executeWatch('const', '"str"')).toEqual(['const=str']);
      });

      it("should support literal array", () => {
        var c = createChangeDetector('array', '[1,2]');
        c["changeDetector"].detectChanges();
        expect(c["dispatcher"].loggedValues).toEqual([[1,2]]);

        c = createChangeDetector('array', '[1,a]', new TestData(2));
        c["changeDetector"].detectChanges();
        expect(c["dispatcher"].loggedValues).toEqual([[1,2]]);
      });

      it("should support literal maps", () => {
        var c = createChangeDetector('map', '{z:1}');
        c["changeDetector"].detectChanges();
        expect(MapWrapper.get(c["dispatcher"].loggedValues[0], 'z')).toEqual(1);

        c = createChangeDetector('map', '{z:a}', new TestData(1));
        c["changeDetector"].detectChanges();
        expect(MapWrapper.get(c["dispatcher"].loggedValues[0], 'z')).toEqual(1);
      });

      it("should support binary operations", () => {
        expect(executeWatch('exp', '10 + 2')).toEqual(['exp=12']);
        expect(executeWatch('exp', '10 - 2')).toEqual(['exp=8']);

        expect(executeWatch('exp', '10 * 2')).toEqual(['exp=20']);
        expect(executeWatch('exp', '10 / 2')).toEqual([`exp=${5.0}`]); //dart exp=5.0, js exp=5
        expect(executeWatch('exp', '11 % 2')).toEqual(['exp=1']);

        expect(executeWatch('exp', '1 == 1')).toEqual(['exp=true']);
        expect(executeWatch('exp', '1 != 1')).toEqual(['exp=false']);

        expect(executeWatch('exp', '1 < 2')).toEqual(['exp=true']);
        expect(executeWatch('exp', '2 < 1')).toEqual(['exp=false']);

        expect(executeWatch('exp', '2 > 1')).toEqual(['exp=true']);
        expect(executeWatch('exp', '2 < 1')).toEqual(['exp=false']);

        expect(executeWatch('exp', '1 <= 2')).toEqual(['exp=true']);
        expect(executeWatch('exp', '2 <= 2')).toEqual(['exp=true']);
        expect(executeWatch('exp', '2 <= 1')).toEqual(['exp=false']);

        expect(executeWatch('exp', '2 >= 1')).toEqual(['exp=true']);
        expect(executeWatch('exp', '2 >= 2')).toEqual(['exp=true']);
        expect(executeWatch('exp', '1 >= 2')).toEqual(['exp=false']);

        expect(executeWatch('exp', 'true && true')).toEqual(['exp=true']);
        expect(executeWatch('exp', 'true && false')).toEqual(['exp=false']);

        expect(executeWatch('exp', 'true || false')).toEqual(['exp=true']);
        expect(executeWatch('exp', 'false || false')).toEqual(['exp=false']);
      });

      it("should support negate", () => {
        expect(executeWatch('exp', '!true')).toEqual(['exp=false']);
        expect(executeWatch('exp', '!!true')).toEqual(['exp=true']);
      });

      it("should support conditionals", () => {
        expect(executeWatch('m', '1 < 2 ? 1 : 2')).toEqual(['m=1']);
        expect(executeWatch('m', '1 > 2 ? 1 : 2')).toEqual(['m=2']);
      });

      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);
        });
      });

      describe("ContextWithVariableBindings", () => {
        it('should read a field from ContextWithVariableBindings', () => {
          var locals = new ContextWithVariableBindings(null,
              MapWrapper.createFromPairs([["key", "value"]]));

          expect(executeWatch('key', 'key', locals))
            .toEqual(['key=value']);
        });

        it('should handle nested ContextWithVariableBindings', () => {
          var nested = new ContextWithVariableBindings(null,
              MapWrapper.createFromPairs([["key", "value"]]));
          var locals = new ContextWithVariableBindings(nested, MapWrapper.create());

          expect(executeWatch('key', 'key', locals))
            .toEqual(['key=value']);
        });

        it("should fall back to a regular field read when ContextWithVariableBindings " +
          "does not have the requested field", () => {
          var locals = new ContextWithVariableBindings(new Person("Jim"),
                MapWrapper.createFromPairs([["key", "value"]]));

          expect(executeWatch('name', 'name', locals))
            .toEqual(['name=Jim']);
        });
      });
    });
  });
}

class Person {
  name:string;
  address:Address;
  constructor(name:string, address:Address = null) {
    this.name = name;
    this.address = address;
  }

  sayHi(m) {
    return `Hi, ${m}`;
  }

  toString():string {
    var address = this.address == null ? '' : ' address=' + this.address.toString();

    return 'name=' + this.name + address;
  }
}

class Address {
  city:string;
  constructor(city:string) {
    this.city = city;
  }

  toString():string {
    return this.city;
  }
}

class TestData {
  a;
  constructor(a) {
    this.a = a;
  }
}

class LoggingDispatcher extends WatchGroupDispatcher {
  log:List;
  loggedValues:List;
  constructor() {
    this.log = null;
    this.loggedValues = null;
    this.clear();
  }

  clear() {
    this.log = ListWrapper.create();
    this.loggedValues = ListWrapper.create();
  }

  onRecordChange(record:Record, context) {
    ListWrapper.push(this.loggedValues, record.currentValue);
    ListWrapper.push(this.log, context + '=' + record.currentValue.toString());
  }
}