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--------------------------------------------------------------------------------

---------------------- ## ##### ##### ###### -----------------------

---------------------- ## ## ## ## ## ## ## -----------------------

---------------------- ## ## ## ## ## ###### -----------------------

---------------------- ## ## ## ## ## ## -----------------------

---------------------- ###### ##### ##### ## -----------------------

---------------------- -----------------------

----------------------- Lua Object-Oriented Programming ------------------------

--------------------------------------------------------------------------------

-- Project: LOOP - Lua Object-Oriented Programming --

-- Release: 2.3 beta --

-- Title : Base Component Model --

-- Author : Renato Maia <maia@inf.puc-rio.br> --

--------------------------------------------------------------------------------

-- Exported API: --

-- Template --

-- Facet --

-- Receptacle --

-- ListReceptacle --

-- HashReceptacle --

-- SetReceptacle --

-- factoryof(component) --

-- templateof(factory|component) --

-- ports(template) --

-- segmentof(portname, component) --

--------------------------------------------------------------------------------

local next = next

local pairs = pairs

local pcall = pcall

local rawget = rawget

local rawset = rawset

local select = select

local type = type

local oo = require "loop.cached"

module "loop.component.base"

--------------------------------------------------------------------------------

BaseTemplate = oo.class()

function BaseTemplate:__call(...)

return self:__build(self:__new(...))

end

function BaseTemplate:__new(...)

local comp = self.__component or self[1]

if comp then

comp = comp(...)

comp.__component = comp

else

comp = ... or {}

end

comp.__factory = self

for port, class in pairs(self) do

if type(port) == "string" and port:match("^%a[%w_]*$") then

comp[port] = class(comp[port], comp)

end

end

return comp

end

local function tryindex(segment) return segment.context end

function BaseTemplate:__setcontext(segment, context)

local success, setcontext = pcall(tryindex, segment)

if success and setcontext ~= nil then

if type(setcontext) == "function"

then setcontext(segment, context)

else segment.context = context

end

end

end

function BaseTemplate:__build(segments)

for port, class in oo.allmembers(oo.classof(self)) do

if port:match("^%a[%w_]*$") then

class(segments, port, segments)

end

end

segments.__reference = segments

for port in pairs(self) do

if port == 1

then self:__setcontext(segments.__component, segments)

else self:__setcontext(segments[port], segments)

end

end

return segments

end

function Template(template, ...)

if select("#", ...) > 0

then return oo.class(template, ...)

else return oo.class(template, BaseTemplate)

end

end

--------------------------------------------------------------------------------

function factoryof(component)

return component.__factory

end

function templateof(object)

return oo.classof(factoryof(object) or object)

end

local nextmember

local function portiterator(state, name)

local port

repeat

name, port = nextmember(state, name)

if name == nil then return end

until name:find("^%a")

return name, port

end

function ports(template)

if not oo.subclassof(template, BaseTemplate) then

template = templateof(template)

end

local state, var

nextmember, state, var = oo.allmembers(template)

return portiterator, state, var

end

function segmentof(comp, port)

return comp[port]

end

--------------------------------------------------------------------------------

function addport(comp, name, port, class)

if class then

comp[name] = class(comp[name], comp)

end

port(comp, name, comp)

comp.__factory:__setcontext(comp[name], context)

end

function removeport(comp, name)

comp[name] = nil

end

--------------------------------------------------------------------------------

function Facet(segments, name)

segments[name] = segments[name] or

segments.__component[name] or

segments.__component

return false

end

--------------------------------------------------------------------------------

function Receptacle()

return false

end

--------------------------------------------------------------------------------

MultipleReceptacle = oo.class{

__all = pairs,

__hasany = next,

__get = rawget,

}

function MultipleReceptacle:__init(segments, name)

local receptacle = oo.rawnew(self, segments[name])

segments[name] = receptacle

return receptacle

end

function MultipleReceptacle:__newindex(key, value)

if value == nil

then self:__unbind(key)

else self:__bind(value, key)

end

end

function MultipleReceptacle:__unbind(key)

local port = rawget(self, key)

rawset(self, key, nil)

return port

end

--------------------------------------------------------------------------------

ListReceptacle = oo.class({}, MultipleReceptacle)

function ListReceptacle:__bind(port)

local index = #self + 1

rawset(self, index, port)

return index

end

--------------------------------------------------------------------------------

HashReceptacle = oo.class({}, MultipleReceptacle)

function HashReceptacle:__bind(port, key)

rawset(self, key, port)

return key

end

--------------------------------------------------------------------------------

SetReceptacle = oo.class({}, MultipleReceptacle)

function SetReceptacle:__bind(port)

rawset(self, port, port)

return port

end

--------------------------------------------------------------------------------

_M[Facet ] = "Facet"

_M[Receptacle ] = "Receptacle"

_M[ListReceptacle] = "ListReceptacle"

_M[HashReceptacle] = "HashReceptacle"

_M[SetReceptacle ] = "SetReceptacle"