Implement Duration.

dart/frog/leg/lib/js_helper.dart

 // Copyright (c) 2012, 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.
 
 #library('js_helper');
 
 #import('coreimpl.dart');
 
 #source('date_helper.dart');
 
@@ skipping 21 matching lines @@
 
 
 add(var a, var b) {
   if (checkNumbers(a, b, "num+ expects a number as second operand.")) {
     return JS("num", @"$0 + $1", a, b);
   } else if (a is String) {
     b = b.toString();
     if (b is String) {
       return JS("String", @"$0 + $1", a, b);
     }
-    // The following line is too long, but we can't break it using the +
-    // operator, since that's what we are defining here.
-    throw "calling toString() on right hand operand of operator + did not return a String";
+    checkNull(b);
+    throw new IllegalArgumentException(b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a + b);
 }
 
 div(var a, var b) {
   if (checkNumbers(a, b, "num/ expects a number as second operand.")) {
     return JS("num", @"$0 / $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a / b);
 }
 
 mul(var a, var b) {
   if (checkNumbers(a, b, "num* expects a number as second operand.")) {
     return JS("num", @"$0 * $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a * b);
 }
 
 sub(var a, var b) {
   if (checkNumbers(a, b, "num- expects a number as second operand.")) {
     return JS("num", @"$0 - $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a - b);
 }
 
 mod(var a, var b) {
   if (checkNumbers(a, b, "int% expects an int as second operand.")) {
     if (b === 0) throw new IntegerDivisionByZeroException();
     // Euclidean Modulo.
     int result = JS("num", @"$0 % $1", a, b);
     if (result == 0) return 0;  // Make sure we don't return -0.0.
     if (result > 0) return result;
     if (b < 0) {
       return result - b;
     } else {
       return result + b;
     }
   }
+  checkNull(a);
   return UNINTERCEPTED(a % b);
 }
 
 tdiv(var a, var b) {
   if (checkNumbers(a, b, "num~/ expects a number as second operand.")) {
     if (b === 0) throw new IntegerDivisionByZeroException();
     return (a / b).truncate();
   }
+  checkNull(a);
   return UNINTERCEPTED(a ~/ b);
 }
 
 eq(var a, var b) {
   if (JS("bool", @"typeof $0 === 'object'", a)) {
     if (JS_HAS_EQUALS(a)) {
       return UNINTERCEPTED(a == b) === true;
     } else {
       return JS("bool", @"$0 === $1", a, b);
     }
@@ skipping 15 matching lines @@
     }
   } else {
     return JS("bool", @"typeof $0 === 'undefined'", a);
   }
 }
 
 gt(var a, var b) {
   if (checkNumbers(a, b, "num> expects a number as second operand.")) {
     return JS("bool", @"$0 > $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a > b);
 }
 
 ge(var a, var b) {
   if (checkNumbers(a, b, "num>= expects a number as second operand.")) {
     return JS("bool", @"$0 >= $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a >= b);
 }
 
 lt(var a, var b) {
   if (checkNumbers(a, b, "num< expects a number as second operand.")) {
     return JS("bool", @"$0 < $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a < b);
 }
 
 le(var a, var b) {
   if (checkNumbers(a, b, "num<= expects a number as second operand.")) {
     return JS("bool", @"$0 <= $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a <= b);
 }
 
 shl(var a, var b) {
   // TODO(floitsch): inputs must be integers.
   if (checkNumbers(a, b, "int<< expects an int as second operand.")) {
     if (b < 0) throw new IllegalArgumentException(b);
     return JS("num", @"$0 << $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a << b);
 }
 
 shr(var a, var b) {
   // TODO(floitsch): inputs must be integers.
   if (checkNumbers(a, b, "int>> expects an int as second operand.")) {
     if (b < 0) throw new IllegalArgumentException(b);
     return JS("num", @"$0 >> $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a >> b);
 }
 
 and(var a, var b) {
   // TODO(floitsch): inputs must be integers.
   if (checkNumbers(a, b, "int& expects an int as second operand.")) {
     return JS("num", @"$0 & $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a & b);
 }
 
 or(var a, var b) {
   // TODO(floitsch): inputs must be integers.
   if (checkNumbers(a, b, "int| expects an int as second operand.")) {
     return JS("num", @"$0 | $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a | b);
 }
 
 xor(var a, var b) {
   // TODO(floitsch): inputs must be integers.
   if (checkNumbers(a, b, "int^ expects an int as second operand.")) {
     return JS("num", @"$0 ^ $1", a, b);
   }
+  checkNull(a);
   return UNINTERCEPTED(a ^ b);
 }
 
 not(var a) {
   if (JS("bool", @"typeof $0 === 'number'", a)) return JS("num", @"~$0", a);
+  checkNull(a);
   return UNINTERCEPTED(~a);
 }
 
 neg(var a) {
   if (JS("bool", @"typeof $0 === 'number'", a)) return JS("num", @"-$0", a);
+  checkNull(a);
   return UNINTERCEPTED(-a);
 }
 
 index(var a, var index) {
   checkNull(a);
   if (a is String || isJSArray(a)) {
     if (index is !int) {
       if (index is !num) throw new IllegalArgumentException(index);
       if (index.truncate() !== index) throw new IllegalArgumentException(index);
     }
     if (index < 0 || index >= a.length) {
       throw new IndexOutOfRangeException(index);
     }
     return JS("Object", @"$0[$1]", a, index);
   }
+  checkNull(a);
   return UNINTERCEPTED(a[index]);
 }
 
 indexSet(var a, var index, var value) {
   checkNull(a);
   if (isJSArray(a)) {
     if (!(index is int)) {
       throw new IllegalArgumentException(index);
     }
     if (index < 0 || index >= a.length) {
       throw new IndexOutOfRangeException(index);
     }
     return JS("Object", @"$0[$1] = $2", a, index, value);
   }
+  checkNull(a);
   return UNINTERCEPTED(a[index] = value);
 }
 
 builtin$add$1(var receiver, var value) {
   checkNull(receiver);
   if (isJSArray(receiver)) {
     JS("Object", @"$0.push($1)", receiver, value);
     return;
   }
   return UNINTERCEPTED(receiver.add(value));
@@ skipping 878 matching lines @@
 builtin$hashCode$0(receiver) {
   if (receiver is num) return receiver & 0x1FFFFFFF;
   if (receiver is String) {
     throw 'String.hashCode is not implemented';
   }
   if (isJSArray(receiver)) {
     throw 'List.hashCode is not implemented';
   }
   return UNINTERCEPTED(receiver.hashCode());
 }