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Copy pathDelegate.lua
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334 lines (291 loc) · 6.78 KB
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Copy pathDelegate.lua
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334 lines (291 loc) · 6.78 KB
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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 ArgumentNullException = System.ArgumentNullException
local setmetatable = setmetatable
local getmetatable = getmetatable
local assert = assert
local select = select
local type = type
local unpack = table.unpack
local Delegate = {}
debug.setmetatable(System.emptyFn, Delegate)
local multicast = setmetatable({}, Delegate)
multicast.__index = multicast
function multicast.__call(t, ...)
local result
for i = 1, #t do
result = t[i](...)
end
return result
end
local function appendFn(t, f)
local count = #t + 1
if getmetatable(f) == multicast then
for i = 1, #f do
t[count] = f[i]
count = count + 1
end
else
t[count] = f
end
end
local function combineImpl(fn1, fn2)
local t = setmetatable({}, multicast)
appendFn(t, fn1)
appendFn(t, 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
Delegate.Combine = combine
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 getmetatable(fn2) ~= multicast then
if getmetatable(fn1) ~= multicast 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 getmetatable(fn1) == multicast 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
Delegate.Remove = remove
function Delegate.RemoveAll(source, value)
local newDelegate
repeat
newDelegate = source
source = remove(source, value)
until newDelegate == source
return newDelegate
end
function Delegate.DynamicInvoke(this, ...)
return this(...)
end
local function equals(fn1, fn2)
if getmetatable(fn1) == multicast then
if getmetatable(fn2) == multicast then
local len1, len2 = #fn1, #fn2
if len1 ~= len2 then
return false
end
for i = 1, len1 do
if fn1[i] ~= fn2[2] then
return false
end
end
return true
end
return false
end
if getmetatable(fn2) == multicast then return false end
return fn1 == fn2
end
Delegate.__add = combine
multicast.__add = combine
Delegate.__sub = remove
multicast.__sub = remove
multicast.__eq = equals
local metatableOfNil = debug.getmetatable(nil)
metatableOfNil.__add = function (a, b)
if a == nil then
if b == nil or type(b) == "number" then
return nil
end
return b
end
return nil
end
function Delegate.EqualsObj(this, obj)
local typename = type(obj)
if typename == "function" then
return equals(this, obj)
end
if typename == "table" then
local metatable = getmetatable(obj)
if metatable == multicast then
return equals(this, obj)
end
end
return false
end
function Delegate.GetType(this)
return System.typeof(Delegate)
end
local multiKey = System.multiKey
local mt = {}
local function makeGenericTypes(...)
local gt, gk = multiKey(mt, ...)
local t = gt[gk]
if t == nil then
t = setmetatable({ ... }, Delegate)
gt[gk] = t
end
return t
end
System.define("System.Delegate", Delegate)
setmetatable(Delegate, { __index = System.Object, __call = makeGenericTypes })
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, 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, 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