Language/12_Expressions/15_Method_Invocation/1_Ordinary_Invocation_A04_t01.dart

/*
 * Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 * for details. All rights reserved. Use of this source code is governed by a
 * BSD-style license that can be found in the LICENSE file.
 */
/**
 * @assertion Evaluation of an ordinary method invocation i of the form
 * o.m(a1 , . . . , an , xn+1 : an+1 , . . . , xn+k : an+k)
 * proceeds as follows:
 * First, the expression o is evaluated to a value vo. Next, the argument list
 * (a1 , . . . , an , xn+1 : an+1 , . . . , xn+k : an+k) is evaluated
 * yielding actual argument objects o1 , . . . , on+k . Let f be the result of
 * looking up method m in vo with respect to the current library L.
 * Let p1 . . . ph be the required parameters of f, let p1 . . . pm be the
 * positional parameters of f and let ph+1 , . . . , ph+l be the named
 * parameters declared by f.
 * If n < h, or n > m, the method lookup has failed. Furthermore, each
 * xi , n + 1 <= i <= n + k, must have a corresponding named parameter in the
 * set {ph+1 , . . . , ph+l} or the method lookup also fails. Otherwise
 * method lookup has succeeded.
 * If the method lookup succeeded, the body of f is executed with respect to
 * the bindings that resulted from the evaluation of the argument list, and
 * with this bound to vo. The value of i is the value returned after f is
 * executed.
 * @description Checks that first the expression o is evaluated and then expressions in the argument
 * list in order from left to right.
 * @author msyabro
 * @reviewer kaigorodov
 */
import "../../../Utils/expect.dart";

StringBuffer buffer;

class A {
  operator+(otherOperand) {
    buffer.write(2);
    return null;
  }
  operator-(otherOperand) {
    buffer.write(3);
    return null;
  }
}

class B {
  B() {
    buffer.write(5);
  }
}

class C {
  C() {
    buffer.write(4);
  }
}

class O {
  operator+(otherOperand) {
    buffer.write(1);
    return new O();
  }
  method(var a, var b, {var c: null, var d: null}) {}
}

main() {
  buffer = new StringBuffer();
  var o = new O();
  (o + 1).method(new A() + 1, new A() - 2, d: new C(), c: new B());
  Expect.equals("12345", buffer.toString());
}