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--[[

Copyright 2017 YANG Huan (sy.yanghuan@gmail.com).

Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

--]]

local System = System

local throw = System.throw

local Object = System.Object

local debugsetmetatable = System.debugsetmetatable

local ArgumentNullException = System.ArgumentNullException

local setmetatable = setmetatable

local assert = assert

local select = select

local type = type

local unpack = table.unpack

local tmove = table.move

local Delegate

local multicast

local function appendFn(t, count, f)

if type(f) == "table" then

for i = 1, #f do

t[count] = f[i]

count = count + 1

end

else

t[count] = f

count = count + 1

end

return count

end

local function combineImpl(fn1, fn2)

local t = setmetatable({}, multicast)

local count = 1

count = appendFn(t, count, fn1)

appendFn(t, count, fn2)

return t

end

local function combine(fn1, fn2)

if fn1 ~= nil then

if fn2 ~= nil then

return combineImpl(fn1, fn2)

end

return fn1

end

if fn2 ~= nil then return fn2 end

return nil

end

local function equalsMulticast(fn1, fn2, start, count)

for i = 1, count do

if fn1[start + i] ~= fn2[i] then

return false

end

end

return true

end

local function delete(fn, count, deleteIndex, deleteCount)

local t = setmetatable({}, multicast)

local len = 1

for i = 1, deleteIndex - 1 do

t[len] = fn[i]

len = len + 1

end

for i = deleteIndex + deleteCount, count do

t[len] = fn[i]

len = len + 1

end

return t

end

local function removeImpl(fn1, fn2)

if type(fn2) ~= "table" then

if type(fn1) ~= "table" then

if fn1 == fn2 then

return nil

end

else

local count = #fn1

for i = count, 1, -1 do

if fn1[i] == fn2 then

if count == 2 then

return fn1[3 - i]

else

return delete(fn1, count, i, 1)

end

end

end

end

elseif type(fn1) == "table" then

local count1, count2 = #fn1, # fn2

local diff = count1 - count2

for i = diff + 1, 1, -1 do

if equalsMulticast(fn1, fn2, i - 1, count2) then

if diff == 0 then

return nil

elseif diff == 1 then

return fn1[i ~= 1 and 1 or count1]

else

return delete(fn1, count1, i, count2)

end

end

end

end

return fn1

end

local function remove(fn1, fn2)

if fn1 ~= nil then

if fn2 ~= nil then

return removeImpl(fn1, fn2)

end

return fn1

end

return nil

end

local multiKey = System.multiKey

local mt = {}

local function makeGenericTypes(...)

local gt, gk = multiKey(mt, nil, ...)

local t = gt[gk]

if t == nil then

t = setmetatable({ ... }, Delegate)

gt[gk] = t

end

return t

end

Delegate = System.define("System.Delegate", {

__add = combine,

__sub = remove,

EqualsObj = System.equals,

Combine = combine,

Remove = remove,

RemoveAll = function (source, value)

local newDelegate

repeat

newDelegate = source

source = remove(source, value)

until newDelegate == source

return newDelegate

end,

DynamicInvoke = function (this, ...)

return this(...)

end,

GetType = function ()

return System.typeof(Delegate)

end,

GetInvocationList = function (this)

local t

if type(this) == "table" then

t = {}

tmove(this, 1, #this, 1, t)

else

t = { this }

end

return System.arrayFromTable(t, Delegate)

end

})

local delegateMetaTable = setmetatable({ __index = Object, __call = makeGenericTypes }, Object)

setmetatable(Delegate, delegateMetaTable)

if debugsetmetatable then

debugsetmetatable(System.emptyFn, Delegate)

function System.event(name)

local function a(this, v)

this[name] = this[name] + v

end

local function r(this, v)

this[name] = this[name] - v

end

return a, r

end

else

System.DelegateCombine = combine

System.DelegateRemove = remove

function System.event(name)

local function a(this, v)

this[name] = combine(this[name], v)

end

local function r(this, v)

this[name] = remove(this[name], v)

end

return a, r

end

end

multicast = setmetatable({

__index = Delegate,

__add = combine,

__sub = remove,

__call = function (t, ...)

local result

for i = 1, #t do

result = t[i](...)

end

return result

end,

__eq = function (fn1, fn2)

local len1, len2 = #fn1, #fn2

if len1 ~= len2 then

return false

end

for i = 1, len1 do

if fn1[i] ~= fn2[i] then

return false

end

end

return true

end

}, Delegate)

function System.fn(target, method)

assert(method)

if target == nil then throw(ArgumentNullException()) end

local f = target[method]

if f == nil then

f = function (...)

return method(target, ...)

end

target[method] = f

end

return f

end

local binds = setmetatable({}, { __mode = "k" })

function System.bind(f, n, ...)

assert(f)

local gt, gk = multiKey(binds, nil, f, ...)

local fn = gt[gk]

if fn == nil then

local args = { ... }

fn = function (...)

local len = select("#", ...)

if len == n then

return f(..., unpack(args))

else

assert(len > n)

local t = { ... }

for i = 1, #args do

local j = args[i]

if type(j) == "number" then

j = select(n + j, ...)

assert(j)

end

t[n + i] = j

end

return f(unpack(t, 1, n + #args))

end

end

gt[gk] = fn

end

return fn

end

local function bind(f, create, ...)

assert(f)

local gt, gk = multiKey(binds, nil, f, create)

local fn = gt[gk]

if fn == nil then

fn = create(f, ...)

gt[gk] = fn

end

return fn

end

local function create1(f, a)

return function (...)

return f(..., a)

end

end

function System.bind1(f, a)

return bind(f, create1, a)

end

local function create2(f, a, b)

return function (...)

return f(..., a, b)

end

end

function System.bind2(f, a, b)

return bind(f, create2, a, b)

end

local function create3(f, a, b, c)

return function (...)

return f(..., a, b, c)

end

end

function System.bind3(f, a, b, c)

return bind(f, create3, a, b, c)

end

local function create2_1(f)

return function(x1, x2, T1, T2)

return f(x1, x2, T2, T1)

end

end

function System.bind2_1(f)

return bind(f, create2_1)

end

local function create0_2(f)

return function(x1, x2, T1, T2)

return f(x1, x2, T2)

end

end

function System.bind0_2(f)

return bind(f, create0_2)

end

local EventArgs = System.define("System.EventArgs")

EventArgs.Empty = setmetatable({}, EventArgs)