Declarative Behaviors (Moo/CS)

gistfile1.txt

do ->

    walk = (parts, value) ->
        stack = {}
        part = parts.shift()
        
        if parts.length
            stack[part] = walk(parts, value)
        else
            stack[part] = value
            
        return stack

    namespace = (element, label) ->
        params = {}
        key = "data-" + label + "-"

        Array.each(element.attributes, (attribute) ->
            name = attribute.name
            if name.contains(key)
                parts = name.replace(key, "").split("-")
                Object.merge(params, walk(parts, element.get(name)))
        )
        
        return params

    window.Behaviors = new Class({
        "initialize": (scope) ->
            @scope = scope
            @registry = {}
            return this
            
        "add": (label, options) ->
            @registry[label] = behavior = {
                "label": label
                "scope": @scope or document.id(document.body)
                "options": options
                "elements": []
            }
            
            if options.scope
                behavior.scope = document.id(options.scope)
            
            elements = behavior.scope.getElements("[data-behaviors~=" + label + "]")
            elements.each((element) ->
                 behavior.elements.include(element)
                 behavior.options.onAdd and behavior.options.onAdd.apply(element, [behavior.scope, namespace(element, label)])
            )
            
            return this
            
        "remove": (label) ->
            behavior = @registry[label]
            
            behavior.elements.each((element) ->
                behavior.options.onRemove and behavior.options.onRemove.apply(element, [behavior.scope, namespace(element, label)])
            )
            
            delete @registry[label]
            return this
            
        "update": ->
            Object.each(@registry, (behavior) ->
                elements = behavior.scope.getElements("[data-behaviors~=" + behavior.label + "]")
                
                elements.each((element) ->

                    behavior.options.onUpdate and behavior.options.onUpdate.applyapply(element, [behavior.scope, namespace(element, behavior.label)])
                    
                    unless behavior.elements.contains(element)
                        behavior.elements.push(element)
                        behavior.options.onAdd and behavior.options.onAdd.apply(element, [behavior.scope, namespace(element, behavior.label)])
                )
                
                behavior.elements.each((element) ->
                    unless elements.contains(element)
                        behavior.elements.erase(element)
                        behavior.options.onRemove and behavior.options.onRemove.apply(element, [behavior.scope, namespace(element, behavior.label)])
                )
                
                return this
            )
    })

    return