Add view support for node properties

src/compile.coffee

@@ -94,6 +94,15 @@ Property =
     else
       throw new SyntaxError("unkown lifecycle event '#{ast.name}'")
 
+  property: (ast, node, model, controller) ->
+    set = (value) ->
+      assignUnlessEqual(node.element, ast.name, value)
+    if ast.bound and ast.value
+      bindToProperty node, model, ast.value, (_, value) ->
+        set(value)
+    else
+      set(ast.value ? model)
+
 Compile =
   element: (ast, model, controller) ->
     element = Serenade.document.createElement(ast.name)

test/integration/properties.spec.coffee

@@ -0,0 +1,57 @@
+require './../spec_helper'
+
+describe 'Bound properties', ->
+  beforeEach ->
+    @setupDom()
+
+  it 'supports non-bound values', ->
+    model = {}
+    @render 'input[property:disabled="disabled"]', model
+    expect(@body).to.have.element('input[disabled]')
+
+  it 'does not add bound property if value is undefined in model', ->
+    model = {}
+    @render 'input[property:disabled=@foo]', model
+    expect(@body).not.to.have.element('input[disabled]')
+
+  it 'get bound properties from the model', ->
+    model = { disabled: true }
+    @render 'input[property:disabled=disabled]', model
+    expect(@body).to.have.element('input[disabled]')
+
+  it 'changes bound properties as they are changed', ->
+    model = Serenade(disabled: true)
+    @render 'input[property:disabled=disabled]', model
+    expect(@body).to.have.element('input[disabled]')
+    model.disabled = false
+    expect(@body).not.to.have.element('input[disabled]')
+
+  it 'does not access getter more than once when updating dom nodes', ->
+    model = {}
+    counter = 0
+
+    Serenade.defineProperty model, "counter",
+      get: ->
+        counter += 1
+        @_counter
+      set: (value) ->
+        @_counter = value
+
+    model.counter_property.trigger()
+    @render "input[property:disabled=@counter]", model
+    expect(counter).to.eql(2)
+    model.counter = true
+    expect(counter).to.eql(3)
+    model.counter = false
+    expect(counter).to.eql(4)
+
+  it 'can set several property bindings', ->
+    model = Serenade(disabled: true, checked: true)
+    @render 'input[type="checkbox" property:disabled=@disabled property:checked=@checked]', model
+    expect(@body).to.have.element('input[disabled][checked]')
+    model.disabled = false
+    expect(@body).not.to.have.element('input[disabled][checked]')
+    expect(@body).to.have.element('input[checked]')
+    model.checked = false
+    expect(@body).not.to.have.element('input[checked]')
+    expect(@body).to.have.element('input')

test/spec_helper.coffee

@@ -51,6 +51,8 @@ beforeEach ->
     @assert actual is text, "expected #{actual} to be #{text}"
   chai.Assertion::attribute = (name) ->
     @assert @obj.hasAttribute(name), "expected #{@obj} to have attribute #{name}"
+  chai.Assertion::property = (name) ->
+    @assert @obj[name], "expected #{@obj} to have property #{name}"
   chai.Assertion::triggerEvent = (event, options={}) ->
     args = null
     count = 0