From b65aa29de36cda6aaa54bef1b04676b613cfd1e6 Mon Sep 17 00:00:00 2001 From: Erica Marigold Date: Fri, 21 Jun 2024 16:00:39 +0530 Subject: [PATCH] chore: remove incomplete `Iter` --- lib/iter.luau.old | 214 ---------------------------------------------- 1 file changed, 214 deletions(-) delete mode 100644 lib/iter.luau.old diff --git a/lib/iter.luau.old b/lib/iter.luau.old deleted file mode 100644 index 9ff7144..0000000 --- a/lib/iter.luau.old +++ /dev/null @@ -1,214 +0,0 @@ ---[[ - Reference: https://doc.rust-lang.org/std/slice/struct.Iter.html -]] - -local option = require("option") -type Option = option.Option -local Some = option.Some -local None = option.None - -local result = require("result") -type Result = result.Result - -local Iter = {} -type Iter = typeof(Iter) & { - _inner: { T }, - _rev: { T }?, - _currentPos: number, - _length: number, -} - -local function revTable(tab: {}) - local tbl = tab - - for i = 1, #tbl // 2, 1 do - tbl[i], tbl[#tbl - i + 1] = tbl[#tbl - i + 1], tbl[i] - end - - return tbl -end - -function Iter.new(iterable: { T }) - return setmetatable( - { - _inner = iterable, - _currentPos = 0, - _len = #iterable, - } :: Iter, - { - __index = Iter, - } - ) -end - -function Iter.nextBack(self: Iter): Option - local elem = table.remove(self._inner, #self._inner) - - if elem == nil then - return None() - end - - return Some(elem) -end - -function Iter.nthBack(self: Iter, n: number): Option - local rev = self._rev or revTable(self._inner) - local elem: T? = rev[n] - - if elem ~= nil then - return Some(elem) - end - - return None() -end - --- function Iter.advanceBackBy(self: Iter, n: number): Result<(), number> end - ---@canError -function Iter.tryRfold(self: Iter, init: B, f: (B, T) -> Result): R - local accum = init - - local next: Option = self:nextBack() - while next:isSome() do - accum = f(accum :: B, next:getInner() :: T):unwrap() - next = self:nextBack() - end - - return accum -end - -function Iter.rfold(self: Iter, init: B, f: (B, T) -> R): B - local accum: B | R = init - - local next: Option = self:nextBack() - while next:isSome() do - accum = f(accum :: B, next:getInner() :: T) - next = self:nextBack() - end - - return accum :: B -end - -function Iter.rfind(self: Iter, predicate: (T) -> boolean): Option - local rev = self._rev or revTable(self._inner) - - for _, val in rev do - if predicate(val) == true then - return Some(val) - end - end - - return None() -end - -function Iter.len(self: Iter): number - return #self._inner -end - -function Iter.next(self: Iter): Option - local nextIdx = self._currentPos + 1 - - if nextIdx > self._length then - return None() - end - - self._currentPos = nextIdx - return Some(self._inner[nextIdx]) -end - -function Iter.count(self: Iter): number - local count = self._currentPos - - -- "Consume" self - self = self.new({}) - - return count -end - -function Iter.nth(self: Iter, n: number): Option - local elem: T? = self._inner[n] - - if elem ~= nil then - return Some(elem) - end - - return None() -end - -function Iter.last(self: Iter): Option - local val = self._inner[self._length] - - -- "Consume" self - self = self.new({}) - - if val == nil then - -- Should only occur when iterator is empty - return None() - end - - return Some(val) -end - -function Iter.fold(self: Iter, init: B, f: (B, T) -> B) - local accum = init - - local next: Option = self:nextBack() - while next:isSome() do - accum = f(accum, next:getInner() :: T) - next = self:nextBack() - end - - return accum -end - -function Iter.forEach(self: Iter, f: (T) -> nil): () - for _, v in self._inner do - f(v) - end -end - -function Iter.all(self: Iter, f: (T) -> boolean): boolean - for _, v in self._inner do - local predicate = f - - if predicate(v) == false then - return false - end - end - - return true -end - -function Iter.any(self: Iter, f: (T) -> boolean): boolean - for _, v in self._inner do - local predicate = f - - if predicate(v) == true then - return true - end - end - - return false -end - -function Iter.find(self: Iter, predicate: (T) -> boolean): Option - local next = self:next() - - while next:isSome() do - local inner: T = next:getInner() - if predicate(inner) == true then - return Some(inner) - end - - next = self:next() - end - - return None() -end - --- TODO: findMap after filterMap -function Iter.findMap(self: Iter, f: (T) -> Option): Option - return nil :: any -end - -return Iter