From 02fd3646bc0fcfe98318bb04ec241281fd93630c Mon Sep 17 00:00:00 2001
From: David Greenspan <dgreenspan@alum.mit.edu>
Date: Wed, 10 Jul 2013 04:31:46 -0700
Subject: [PATCH] initial Each render

---
 examples/unfinished/shark/client/shark.js | 15 +++++----
 packages/ui/base.js                       |  6 ++--
 packages/ui/components.js                 | 41 +++++++++++++++++++++++
 3 files changed, 54 insertions(+), 8 deletions(-)

diff --git a/examples/unfinished/shark/client/shark.js b/examples/unfinished/shark/client/shark.js
index 794b78a544..098e018918 100644
--- a/examples/unfinished/shark/client/shark.js
+++ b/examples/unfinished/shark/client/shark.js
@@ -4,9 +4,11 @@ Items.insert({ text: 'Bar' });
 Items.insert({ text: 'Baz' });
 
 Meteor.startup(function () {
-  Items.insert({ text: 'Qux' });
-  Items.remove({ text: 'Foo' });
-  Items.update({ text: 'Bar' }, { text: 'Car' });
+  Meteor.setTimeout(function () {
+    Items.insert({ text: 'Qux' });
+    Items.remove({ text: 'Foo' });
+    Items.update({ text: 'Bar' }, { text: 'Car' });
+  }, 1000);
 });
 
 Body({
@@ -106,13 +108,14 @@ Either = UIComponent.extend({
           elseContent: Span
         }),
         { type: Span });
-    /*    buf(new _UI.Each({
+    buf(new _UI.Each({
+      data: function () { return Items.find({}, { sort: { text: 1 }}); },
       content: UIComponent.extend({
         render: function (buf) {
-          buf("<div>Each ", String(this.data()), "</div>");
+          buf("<div>Each ", this.data().text, "</div>");
         }
       })
-    }));*/
+    }));
   }
 });
 
diff --git a/packages/ui/base.js b/packages/ui/base.js
index 6ff636919f..18bc53f81b 100644
--- a/packages/ui/base.js
+++ b/packages/ui/base.js
@@ -17,7 +17,7 @@ var constrImpl = function (ths, args, type) {
 
   if (! (ths instanceof type))
     // invoked without `new`
-    return new type;
+    return new type(args[0], args[1]);
 
   // invoked as `new Foo(...)`
   if (! type._superSealed)
@@ -236,7 +236,9 @@ _extend(Component, {
 
 Component.include({
   constructed: function () {},
-  data: function () { return null; }
+  data: function () {
+    return this.parent ? this.parent.data() : null;
+  }
 });
 
 // @export UIComponent
diff --git a/packages/ui/components.js b/packages/ui/components.js
index c31474f1a5..0e894e0a31 100644
--- a/packages/ui/components.js
+++ b/packages/ui/components.js
@@ -34,6 +34,47 @@ _UI.If = Component.extend({
   }
 });
 
+_UI.Each = Component.extend({
+  typeName: 'Each',
+  render: function (buf) {
+    var self = this;
+
+    // XXX support arrays too.
+    // XXX and objects.
+    // For now, we assume the data is a database cursor.
+    var cursor = self.data();
+    // XXX support null
+
+    // id -> component
+    var items = self.items = new OrderedDict(Meteor.idStringify);
+
+    cursor.observe({
+      _no_indices: true,
+      addedAt: function (doc, i, beforeId) {
+        var comp = self.content(function () {
+          this.dataDep.depend();
+          return this._data;
+        }, {
+          _data: doc,
+          dataDep: new Deps.Dependency
+        });
+        // XXX could `before` be a falsy ID?  Technically
+        // idStringify seems to allow for them -- though
+        // OrderedDict won't call stringify on a falsy arg.
+        items.putBefore(doc._id, comp, beforeId);
+      }
+    });
+
+    if (items.empty()) {
+      buf(self.elseContent());
+    } else {
+      items.forEach(function (comp) {
+        buf(comp);
+      });
+    }
+  }
+});
+
 _UI.Counter = Component.extend({
   typeName: "Counter",
   fields: {