Added dotted.name support for tags.

Based on Chris's commit 4dc42864e0

README.md

@@ -37,6 +37,12 @@ Tags are always surrounded by mustaches like this `{{foobar}}`.
 
     template = "{{say_hello}}, {{name}}"
 
+### Dotted Tags
+Tags can also be nested to address object and array members in the context.
+
+    var view = {name: {first: "Chris", last: "Anderson"}, values: [1, 2]};
+    template = "{{name.last}}, {{name.first}} {{values.0}}";
+
 ### Conditional Sections
 Conditional sections begin with `{{#condition}}` and end with `{{/condition}}`. When `condition` evaluates to true, the section is rendered, otherwise the hole block will output nothing at all. `condition` may be a function returning true/false or a simple boolean.
 

examples/nested.html

@@ -0,0 +1,3 @@
+Yay {{person.name}}!
+Array style {{value.0}} {{value.1}}
+And {{more.nested.1.values}}!

examples/nested.js

@@ -0,0 +1,10 @@
+var nested = {
+  person: {
+    name: "Chris"
+  },
+  ohyeah: "awesome!",
+  value: ["is", function() {return this.ohyeah;}],
+  more: {
+    nested: [29, {values: "kbai"}]
+  }
+};

examples/nested.txt

@@ -0,0 +1,4 @@
+Yay Chris!
+Array style is awesome!
+And kbai!
+

examples/nested_array_bounds.html

@@ -0,0 +1 @@
+Out of bounds! {{foo.5}}

examples/nested_array_bounds.js

@@ -0,0 +1,3 @@
+var nested_array_bounds = {
+  foo: [1, 2]
+};

examples/nested_array_bounds.txt

@@ -0,0 +1 @@
+ERROR: 'foo.5' not found in context

examples/nested_error.html

@@ -0,0 +1 @@
+This doesn't exist: {{foo.bar}}

examples/nested_error.js

@@ -0,0 +1 @@
+var nested_error = {not_foo: {not_bar: "yay error!"}};

examples/nested_error.txt

@@ -0,0 +1 @@
+ERROR: 'foo.bar' not found in context

mustache.js

@@ -130,11 +130,12 @@ var Mustache = function() {
     */
     find: function(name, context) {
       name = this.trim(name);
-      if(typeof context[name] === "function") {
-        return context[name].apply(context);
+      var value = this.getValue(context, name);
+      if(typeof value === "function") {
+        return value.apply(context);
       }
-      if(context[name] !== undefined) {
-        return context[name];
+      if(value !== undefined) {
+        return value;
       }
       throw({message: "'" + name + "' not found in context"});
     },
@@ -157,6 +158,22 @@ var Mustache = function() {
       });
     },
 
+    getValue: function(context, name) {
+      if(name == "." && context[name] != undefined) {
+        return context[name];
+      }
+      var ctx = context;
+      var parts = name.split(".");
+      while(parts.length) {
+        p = parts.shift();
+        if(ctx[p] === undefined) {
+          throw({message: "'" + name + "' not found in context"});
+        }
+        ctx = ctx[p];
+      }
+      return ctx
+    },
+
     /*
       Merges all properties of object `b` into object `a`.
       `b.property` overwrites a.property`