Merge pull request #186 from mikeric/components

Components

@@ -155,6 +155,56 @@ class Rivets.Binding
 
     @binder.update?.call @, models
 
+# Rivets.ComponentBinding
+# -----------------------
+
+# A component view encapsulated as a binding within it's parent view.
+class Rivets.ComponentBinding extends Rivets.Binding
+  # Initializes a component binding for the specified view. The raw component
+  # element is passed in along with the component type. Attributes and scope
+  # inflections are determined based on the components defined attributes.
+  constructor: (@view, @el, @type) ->
+    @component = Rivets.components[@type]
+    @attributes = {}
+    @inflections = {}
+
+    for attribute in @el.attributes or []
+      if attribute.name in @component.attributes
+        @attributes[attribute.name] = attribute.value
+      else
+        @inflections[attribute.name] = attribute.value
+
+  # Intercepts `Rivets.Binding::sync` since component bindings are not bound to a
+  # particular model to update it's value.
+  sync: ->
+
+  # Returns an object map using the component's scope inflections.
+  locals: (models = @view.models) =>
+    result = {}
+    result[key] = models[inverse] for key, inverse of @inflections
+    result[key] ?= model for key, model of models
+
+    result
+
+  # Intercepts `Rivets.Binding::update` to be called on `@componentView` with a
+  # localized map of the models.
+  update: (models) =>
+    @componentView?.update @locals models
+
+  # Intercepts `Rivets.Binding::bind` to build `@componentView` with a localized
+  # map of models from the root view. Bind `@componentView` on subsequent calls.
+  bind: =>
+    if @componentView?
+      @componentView?.bind()
+    else
+      el = @component.build.call @attributes
+      (@componentView = new Rivets.View(el, @locals(), @view.options)).bind()
+      @el.parentNode.replaceChild el, @el
+
+  # Intercept `Rivets.Binding::unbind` to be called on `@componentView`.
+  unbind: =>
+    @componentView?.unbind()
+
 # Rivets.View
 # -----------
 
@@ -178,13 +228,18 @@ class Rivets.View
     prefix = @config.prefix
     if prefix then new RegExp("^data-#{prefix}-") else /^data-/
 
+  # Regular expression used to match component nodes.
+  componentRegExp: =>
+    new RegExp "^#{@config.prefix?.toUpperCase() ? 'RV'}-"
+
   # Parses the DOM tree and builds `Rivets.Binding` instances for every matched
-  # binding declaration. Subsequent calls to build will replace the previous
-  # `Rivets.Binding` instances with new ones, so be sure to unbind them first.
+  # binding declaration.
   build: =>
     @bindings = []
     skipNodes = []
     bindingRegExp = @bindingRegExp()
+    componentRegExp = @componentRegExp()
+
 
     buildBinding = (node, type, declaration) =>
       options = {}
@@ -227,6 +282,9 @@ class Rivets.View
                 for token in restTokens
                   node.parentNode.appendChild (text = document.createTextNode token.value)
                   buildBinding text, 'textNode', token.value if token.type is 1
+        else if componentRegExp.test node.tagName
+          type = node.tagName.replace(componentRegExp, '').toLowerCase()
+          @bindings.push new Rivets.ComponentBinding @, node, type
 
         else if node.attributes?
           for attribute in node.attributes
@@ -591,6 +649,14 @@ Rivets.internalBinders =
   textNode: (node, value) ->
     node.data = value ? ''
 
+# Rivets.components
+# -----------------
+
+# Default components (there aren't any), publicly accessible on
+# `module.components`. Can be overridden globally or local to a `Rivets.View`
+# instance.
+Rivets.components = {}
+
 # Rivets.config
 # -------------
 
@@ -620,6 +686,9 @@ Rivets.factory = (exports) ->
   # Exposes the core binding routines that can be extended or stripped down.
   exports.binders = Rivets.binders
 
+  # Exposes the components object to be extended.
+  exports.components = Rivets.components
+
   # Exposes the formatters object to be extended.
   exports.formatters = Rivets.formatters