Add Stream.fromIterable

sdk/lib/core/iterable.dart

Index: sdk/lib/core/iterable.dart
diff --git a/sdk/lib/core/iterable.dart b/sdk/lib/core/iterable.dart
index 083a86db0cfd78a7869f5a9b88f97fcd08fba541..74b78c3232c5adf40ed0f67c54bce6d429c1d3c4 100644
--- a/sdk/lib/core/iterable.dart
+++ b/sdk/lib/core/iterable.dart
@@ -19,6 +19,9 @@ part of dart.core;
 abstract class Iterable<E> {
   const Iterable();
 
+  factory Iterable.generate(int count, E generator(int index))
+      = _GeneratorIterable;

[floitsch, 2013/01/08 13:02:54]

Add TODO that we need to forward the generic type.

[Lasse Reichstein Nielsen, 2013/01/09 11:27:36]

My mistake, I thought it was implicitly forwarded.
If dart2js doesn't implement generics, I'll just use a normal body for now.

+
   /**
    * Returns an [Iterator] that iterates over this [Iterable] object.
    */
@@ -572,3 +575,35 @@ class SkipWhileIterator<E> extends Iterator<E> {
 
   E get current => _iterator.current;
 }
+
+
+typedef E _Generator<E>(int index);
+
+class _GeneratorIterable<E> extends Iterable<E> {
+  int _count;
+  _Generator<E> _generator;

[floitsch, 2013/01/08 13:02:54]

final

[Lasse Reichstein Nielsen, 2013/01/09 11:27:36]

Done.

+  _GeneratorIterable(this._count, this._generator);
+  Iterable<E> get iterator => new _GeneratorIterator(_count, _generator);
+}
+
+class _GeneratorIterator<E> implements Iterator<E> {
+  final int _count;
+  int _index = 0;
+  final _Generator<E> _generator;
+  E _current;
+
+  _GeneratorIterator(this._count, this._generator);
+
+  bool moveNext() {
+    if (_index < _count) {
+      _current = _generator(_index);
+      _index++;
+      return true;
+    } else {
+      _current = null;
+      return false;
+    }
+  }
+
+  E get current => _current;
+}