js_mimicry 0.0.1+4

Allows the use of Dart classes and objects in javascript. Generates a special proxy classes.

JsMimicry

Allows the use of Dart classes and objects in javascript. Generates a special proxy classes.

Create javascript API for Dart become easier.

Support:

• Class inheritance
• Named constructors
• Method
• Optional positional parameters
• Optional named parameters
• Input parameter transform
• Result mutation
• Future (via result mutator)

Not support:

• Factory
• Field
• Getter/Setter
• Operator

##Dart code (sample 'entry_point.dart'): // entry_point.dart /* imports */

class Test1{
  method1(p1,[p2]){/* code */}
  method2(p1,p2){/* code */}
}

class Test2 extends Test1{
  int method2(p1,p2){/* new logic */}
  String method3(Test1 obj){/* code */}
  Future<int> method4(){/* code */}
  Test1 method5({namedP1, namedP2}){/* code */}
}

##Add annotation for class @jsProxy() class Test2 extends Test1{ // ... cut ... }

##Add annotation for transform input parameter String method3(@jsTransform(Test1Proxy.toDart) Test1 obj){/* code */}

##Add annotation for mutation result Future @jsMutator(insertParams:const ["resultCb","errorCb"],result:Test2.futureToCallbacks) Future

static futureToCallbacks(Future result,js.JsFunction resultCb,[js.JsFunction errorCb]){
    if (errorCb!=null){
        result = result.catchError((err)=>errorCb.apply([err]));
    }
    result.then((o)=>resultCb.apply([o]));
    return result;
}

##Add annotation for mutation result instance object @jsMutator(result:Test1Proxy.toJS) Test1 method5(){/* code */}

##Create generator Js Proxy for your entry point dart file //Create dart file in bin folder import 'dart:io'; import 'package:analyzer/formatter.dart'; import 'package:analyzer/src/services/formatter_impl.dart'; import 'package:js_mimicry/generator.dart';

main(List<String> args) {
    var fileName = "entry_point.dart";
    var gen = new GeneratorJsMimicry(new File(fileName));
    StringBuffer sb = new StringBuffer();
    gen.generateProxyFile(sb,fileName);
    CodeFormatter cf = new CodeFormatter();
    new File(fileName + ".proxy.dart").writeAsStringSync(
      cf.format(CodeKind.COMPILATION_UNIT,
      sb.toString()
      ).source
      , mode: FileMode.WRITE);
}

Output: entry_point.dart.proxy.dart Include entry_point.dart.proxy.dart in import.

Result sample code:

// entry_point.dart
import 'package:js_mimicry/annotation.dart';
import 'entry_point.dart.proxy.dart'

class Test1{
  method1(p1,[p2]){/* code */}
  method2(p1,p2){/* code */}
}

@jsProxy()
class Test2 extends Test1{
  int method2(p1,p2){/* new logic */}
  String method3(@jsTransform(Test1Proxy.toDart) Test1 obj)
  @jsMutator(insertParams:const ["resultCb","errorCb"],result:Test2.futureToCallbacks)
  Future<int> method4(){/* code */}
  @jsMutator(result:Test1Proxy.toJS)
  Test1 method5({namedP1, namedP2}){/* code */}
  
  static futureToCallbacks(Future result,js.JsFunction resultCb,[js.JsFunction errorCb]){
    if (errorCb!=null){
        result = result.catchError((err)=>errorCb.apply([err]));
    }
    result.then((o)=>resultCb.apply([o]));
    return result;
  }
}

Import to javascript

import 'dart:js' as js;
main(){
  // Export Test2 class to JS
  Test2Proxy.jsRegistrationPrototype();
  // Create instance Test1
  js.context["dartInstanceTest1"] = Test1Proxy.toJS(new Test1()); 
}

Uses in javascript

// Create Test2 instance, call method5 with named parameters
new Test2().method5({namedP1:"123"});
// call Test1.method1 with optional parameters
dartInstanceTest1.method1("1");

Proxy methods

###JsObject toJS(DartClass obj) Create proxy object for Test2 object. ###jsRegistrationPrototype() Creates a special a new functions on the side javascript. ###DartClass toDart(JsObject obj) Convert javascript proxy to real Dart object.