2,875
edits
Module:FunList/Iterators: Difference between revisions
Add ConcatEnumerator
(Finally added support for ipairs) |
(Add ConcatEnumerator) |
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| Line 110: | Line 110: | ||
function SelectEnumerator.new(source, selector) | function SelectEnumerator.new(source, selector) | ||
assert(source, 'Source cannot be nil') | |||
assert(selector, 'Selector cannot be nil') | |||
local self = setmetatable(Enumerator.new(), SelectEnumerator) | local self = setmetatable(Enumerator.new(), SelectEnumerator) | ||
self.state = 0 | self.state = 0 | ||
| Line 153: | Line 155: | ||
function WhereEnumerator.new(source, predicate) | function WhereEnumerator.new(source, predicate) | ||
assert(source, 'Source cannot be nil') | |||
assert(predicate, 'Predicate cannot be nil') | |||
local self = setmetatable(Enumerator.new(), WhereEnumerator) | local self = setmetatable(Enumerator.new(), WhereEnumerator) | ||
self.state = 0 | self.state = 0 | ||
| Line 189: | Line 193: | ||
end | end | ||
-- | -- SELECTMANY ENUMERATOR -- | ||
local SelectManyEnumerator = setmetatable({}, { __index = Enumerator }) | local SelectManyEnumerator = setmetatable({}, { __index = Enumerator }) | ||
SelectManyEnumerator.__index = SelectManyEnumerator | SelectManyEnumerator.__index = SelectManyEnumerator | ||
| Line 196: | Line 200: | ||
function SelectManyEnumerator.new(source, selector) | function SelectManyEnumerator.new(source, selector) | ||
assert(source, 'Source cannot be nil') | |||
assert(selector, 'Selector cannot be nil') | |||
local self = setmetatable(Enumerator.new(), SelectManyEnumerator) | local self = setmetatable(Enumerator.new(), SelectManyEnumerator) | ||
self.state = 0 | self.state = 0 | ||
| Line 253: | Line 259: | ||
function SelectManyEnumerator:getEnumerator(isArray) | function SelectManyEnumerator:getEnumerator(isArray) | ||
local instance = (self.state == 0) and self or SelectManyEnumerator.new(self.source, self.selector) | local instance = (self.state == 0) and self or SelectManyEnumerator.new(self.source, self.selector) | ||
instance.isArray = isArray | |||
return instance | |||
end | |||
-- CONCAT ENUMERATOR -- | |||
local ConcatEnumerator = setmetatable({}, { __index = Enumerator }) | |||
ConcatEnumerator.__index = ConcatEnumerator | |||
ConcatEnumerator.__pairs = Enumerator_mt.__pairs | |||
ConcatEnumerator.__ipairs = Enumerator_mt.__ipairs | |||
function ConcatEnumerator.new(first, second) | |||
assert(first, 'First cannot be nil') | |||
assert(second, 'Second cannot be nil') | |||
local self = setmetatable(Enumerator.new(), ConcatEnumerator) | |||
self.state = 0 | |||
self.first = first | |||
self.second = second | |||
self.enumerator = nil | |||
return self | |||
end | |||
-- Function to grab enumerators in order. We currently only have two so this | |||
-- seems a bit redundant. But it would allow to add N-amount of enumerables. | |||
function ConcatEnumerator:getEnumerable(index) | |||
if index == 0 then | |||
return self.first | |||
elseif index == 1 then | |||
return self.second | |||
else | |||
return nil | |||
end | |||
end | |||
function ConcatEnumerator:moveNext() | |||
if self.state == 0 then | |||
self.enumerator = self:getEnumerable(self.state) | |||
:getEnumerator(self.isArray) | |||
self.state = 1 | |||
end | |||
if self.state > 0 then | |||
while true do | |||
if self.enumerator:moveNext() == true then | |||
self.index = self.enumerator.index | |||
self.current = self.enumerator.current | |||
return true | |||
end | |||
self.state = self.state + 1 | |||
local next = self:getEnumerable(self.state - 1) | |||
if next ~= nil then | |||
self.enumerator = next:getEnumerator(self.isArray) | |||
else | |||
return false | |||
end | |||
end | |||
end | |||
return false | |||
end | |||
function ConcatEnumerator:getEnumerator(isArray) | |||
local instance = (self.state == 0) and self or ConcatEnumerator.new(self.first, self.second) | |||
instance.isArray = isArray | instance.isArray = isArray | ||
return instance | return instance | ||
| Line 262: | Line 331: | ||
SelectEnumerator = SelectEnumerator, | SelectEnumerator = SelectEnumerator, | ||
WhereEnumerator = WhereEnumerator, | WhereEnumerator = WhereEnumerator, | ||
SelectManyEnumerator = SelectManyEnumerator | SelectManyEnumerator = SelectManyEnumerator, | ||
ConcatEnumerator = ConcatEnumerator | |||
} | } | ||