diff options
| -rw-r--r-- | contrib/lua-fun/fun.lua | 513 |
1 files changed, 293 insertions, 220 deletions
diff --git a/contrib/lua-fun/fun.lua b/contrib/lua-fun/fun.lua index 5d019d6a1..6a536d759 100644 --- a/contrib/lua-fun/fun.lua +++ b/contrib/lua-fun/fun.lua @@ -1,11 +1,14 @@ --- --- Lua Fun - a high-performance functional programming library for LuaJIT --- ---- Copyright (c) 2013 Roman Tsisyk <roman@tsisyk.com> +--- Copyright (c) 2013-2014 Roman Tsisyk <roman@tsisyk.com> --- --- Distributed under the MIT/X11 License. See COPYING.md for more details. --- +local exports = {} +local methods = {} + -------------------------------------------------------------------------------- -- Tools -------------------------------------------------------------------------------- @@ -38,6 +41,32 @@ local function deepcopy(orig) -- used by cycle() return copy end +local iterator_mt = { + -- usually called by for-in loop + __call = function(self, param, state) + return self.gen(param, state) + end; + __tostring = function(self) + return '<generator>' + end; + -- add all exported methods + __index = methods; +} + +local wrap = function(gen, param, state) + return setmetatable({ + gen = gen, + param = param, + state = state + }, iterator_mt), param, state +end +exports.wrap = wrap + +local unwrap = function(self) + return self.gen, self.param, self.state +end +methods.unwrap = unwrap + -------------------------------------------------------------------------------- -- Basic Functions -------------------------------------------------------------------------------- @@ -62,16 +91,28 @@ local map_gen = function(tab, key) return key, key, value end -local iter = function(obj, param, state) +local rawiter = function(obj, param, state) assert(obj ~= nil, "invalid iterator") - if (type(obj) == "function") then - return obj, param, state - elseif (type(obj) == "table" or type(obj) == "userdata") then + if type(obj) == "table" then + local mt = getmetatable(obj); + if mt ~= nil then + if mt == iterator_mt then + return obj.gen, obj.param, obj.state + elseif mt.__ipairs ~= nil then + return mt.__ipairs(obj) + elseif mt.__pairs ~= nil then + return mt.__pairs(obj) + end + end if #obj > 0 then + -- array return ipairs(obj) else + -- hash return map_gen, obj, nil end + elseif (type(obj) == "function") then + return obj, param, state elseif (type(obj) == "string") then if #obj == 0 then return nil_gen, nil, nil @@ -82,22 +123,58 @@ local iter = function(obj, param, state) obj, type(obj))) end -local iter_tab = function(obj) - if type(obj) == "function" then - return obj, nil, nil - elseif type(obj) == "table" and type(obj[1]) == "function" then - return obj[1], obj[2], obj[3] - else - return iter(obj) +local iter = function(obj, param, state) + return wrap(rawiter(obj, param, state)) +end +exports.iter = iter + +local method0 = function(fun) + return function(self) + return fun(self.gen, self.param, self.state) + end +end + +local method1 = function(fun) + return function(self, arg1) + return fun(arg1, self.gen, self.param, self.state) + end +end + +local method2 = function(fun) + return function(self, arg1, arg2) + return fun(arg1, arg2, self.gen, self.param, self.state) + end +end + +local export0 = function(fun) + return function(gen, param, state) + return fun(rawiter(gen, param, state)) + end +end + +local export1 = function(fun) + return function(arg1, gen, param, state) + return fun(arg1, rawiter(gen, param, state)) + end +end + +local export2 = function(fun) + return function(arg1, arg2, gen, param, state) + return fun(arg1, arg2, rawiter(gen, param, state)) end end local each = function(fun, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) repeat - state_x = call_if_not_empty(fun, gen_x(param_x, state_x)) - until state_x == nil + state = call_if_not_empty(fun, gen(param, state)) + until state == nil end +methods.each = method1(each) +exports.each = export1(each) +methods.for_each = methods.each +exports.for_each = exports.each +methods.foreach = methods.each +exports.foreach = exports.each -------------------------------------------------------------------------------- -- Generators @@ -106,7 +183,7 @@ end local range_gen = function(param, state) local stop, step = param[1], param[2] local state = state + step - if state >= stop then + if state > stop then return nil end return state, state @@ -115,7 +192,7 @@ end local range_rev_gen = function(param, state) local stop, step = param[1], param[2] local state = state + step - if state <= stop then + if state < stop then return nil end return state, state @@ -123,11 +200,14 @@ end local range = function(start, stop, step) if step == nil then - step = 1 if stop == nil then + if start == 0 then + return nil_gen, nil, nil + end stop = start - start = 0 + start = stop > 0 and 1 or -1 end + step = start <= stop and 1 or -1 end assert(type(start) == "number", "start must be a number") @@ -136,11 +216,12 @@ local range = function(start, stop, step) assert(step ~= 0, "step must not be zero") if (step > 0) then - return range_gen, {stop, step}, start - step + return wrap(range_gen, {stop, step}, start - step) elseif (step < 0) then - return range_rev_gen, {stop, step}, start - step + return wrap(range_rev_gen, {stop, step}, start - step) end end +exports.range = range local duplicate_table_gen = function(param_x, state_x) return state_x + 1, unpack(param_x) @@ -156,24 +237,30 @@ end local duplicate = function(...) if select('#', ...) <= 1 then - return duplicate_gen, select(1, ...), 0 + return wrap(duplicate_gen, select(1, ...), 0) else - return duplicate_table_gen, {...}, 0 + return wrap(duplicate_table_gen, {...}, 0) end end +exports.duplicate = duplicate +exports.replicate = duplicate +exports.xrepeat = duplicate local tabulate = function(fun) assert(type(fun) == "function") - return duplicate_fun_gen, fun, 0 + return wrap(duplicate_fun_gen, fun, 0) end +exports.tabulate = tabulate local zeros = function() - return duplicate_gen, 0, 0 + return wrap(duplicate_gen, 0, 0) end +exports.zeros = zeros local ones = function() - return duplicate_gen, 1, 0 + return wrap(duplicate_gen, 1, 0) end +exports.ones = ones local rands_gen = function(param_x, _state_x) return 0, math.random(param_x[1], param_x[2]) @@ -185,7 +272,7 @@ end local rands = function(n, m) if n == nil and m == nil then - return rands_nil_gen, 0, 0 + return wrap(rands_nil_gen, 0, 0) end assert(type(n) == "number", "invalid first arg to rands") if m == nil then @@ -195,16 +282,16 @@ local rands = function(n, m) assert(type(m) == "number", "invalid second arg to rands") end assert(n < m, "empty interval") - return rands_gen, {n, m - 1}, 0 + return wrap(rands_gen, {n, m - 1}, 0) end +exports.rands = rands -------------------------------------------------------------------------------- -- Slicing -------------------------------------------------------------------------------- -local nth = function(n, gen, param, state) +local nth = function(n, gen_x, param_x, state_x) assert(n > 0, "invalid first argument to nth") - local gen_x, param_x, state_x = iter(gen, param, state) -- An optimization for arrays and strings if gen_x == ipairs then return param_x[n] @@ -223,6 +310,8 @@ local nth = function(n, gen, param, state) end return return_if_not_empty(gen_x(param_x, state_x)) end +methods.nth = method1(nth) +exports.nth = export1(nth) local head_call = function(state, ...) if state == nil then @@ -232,18 +321,24 @@ local head_call = function(state, ...) end local head = function(gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) - return head_call(gen_x(param_x, state_x)) + return head_call(gen(param, state)) end +methods.head = method0(head) +exports.head = export0(head) +exports.car = exports.head +methods.car = methods.head local tail = function(gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) - state_x = gen_x(param_x, state_x) - if state_x == nil then - return nil_gen, nil, nil + state = gen(param, state) + if state == nil then + return wrap(nil_gen, nil, nil) end - return gen_x, param_x, state_x + return wrap(gen, param, state) end +methods.tail = method0(tail) +exports.tail = export0(tail) +exports.cdr = exports.tail +methods.cdr = methods.tail local take_n_gen_x = function(i, state_x, ...) if state_x == nil then @@ -263,9 +358,10 @@ end local take_n = function(n, gen, param, state) assert(n >= 0, "invalid first argument to take_n") - local gen_x, param_x, state_x = iter(gen, param, state) - return take_n_gen, {n, gen, param}, {0, state} + return wrap(take_n_gen, {n, gen, param}, {0, state}) end +methods.take_n = method1(take_n) +exports.take_n = export1(take_n) local take_while_gen_x = function(fun, state_x, ...) if state_x == nil or not fun(...) then @@ -281,29 +377,34 @@ end local take_while = function(fun, gen, param, state) assert(type(fun) == "function", "invalid first argument to take_while") - local gen_x, param_x, state_x = iter(gen, param, state) - return take_while_gen, {fun, gen, param}, state + return wrap(take_while_gen, {fun, gen, param}, state) end +methods.take_while = method1(take_while) +exports.take_while = export1(take_while) local take = function(n_or_fun, gen, param, state) if type(n_or_fun) == "number" then return take_n(n_or_fun, gen, param, state) - else + else return take_while(n_or_fun, gen, param, state) end end +methods.take = method1(take) +exports.take = export1(take) local drop_n = function(n, gen, param, state) assert(n >= 0, "invalid first argument to drop_n") - local gen_x, param_x, state_x = iter(gen, param, state) + local i for i=1,n,1 do - state_x = gen_x(param_x, state_x) - if state_x == nil then - return nil_gen, nil, nil + state = gen(param, state) + if state == nil then + return wrap(nil_gen, nil, nil) end end - return gen_x, param_x, state_x + return wrap(gen, param, state) end +methods.drop_n = method1(drop_n) +exports.drop_n = export1(drop_n) local drop_while_x = function(fun, state_x, ...) if state_x == nil or not fun(...) then @@ -312,40 +413,49 @@ local drop_while_x = function(fun, state_x, ...) return state_x, true, ... end -local drop_while = function(fun, gen, param, state) +local drop_while = function(fun, gen_x, param_x, state_x) assert(type(fun) == "function", "invalid first argument to drop_while") - local gen_x, param_x, state_x = iter(gen, param, state) local cont, state_x_prev repeat state_x_prev = deepcopy(state_x) state_x, cont = drop_while_x(fun, gen_x(param_x, state_x)) until not cont if state_x == nil then - return nil_gen, nil, nil + return wrap(nil_gen, nil, nil) end - return gen_x, param_x, state_x_prev + return wrap(gen_x, param_x, state_x_prev) end +methods.drop_while = method1(drop_while) +exports.drop_while = export1(drop_while) -local drop = function(n_or_fun, gen, param, state) +local drop = function(n_or_fun, gen_x, param_x, state_x) if type(n_or_fun) == "number" then - return drop_n(n_or_fun, gen, param, state) - else - return drop_while(n_or_fun, gen, param, state) + return drop_n(n_or_fun, gen_x, param_x, state_x) + else + return drop_while(n_or_fun, gen_x, param_x, state_x) end end +methods.drop = method1(drop) +exports.drop = export1(drop) -local split = function(n_or_fun, gen, param, state) - return {take(n_or_fun, gen, param, state)}, - {drop(n_or_fun, gen, param, state)} +local split = function(n_or_fun, gen_x, param_x, state_x) + return take(n_or_fun, gen_x, param_x, state_x), + drop(n_or_fun, gen_x, param_x, state_x) end +methods.split = method1(split) +exports.split = export1(split) +methods.split_at = methods.split +exports.split_at = exports.split +methods.span = methods.split +exports.span = exports.split -------------------------------------------------------------------------------- -- Indexing -------------------------------------------------------------------------------- -local index = function(x, gen, param, state) +local index = function(x, gen, param, state) local i = 1 - for _k, r in iter(gen, param, state) do + for _k, r in gen, param, state do if r == x then return i end @@ -353,6 +463,12 @@ local index = function(x, gen, param, state) end return nil end +methods.index = method1(index) +exports.index = export1(index) +methods.index_of = methods.index +exports.index_of = exports.index +methods.elem_index = methods.index +exports.elem_index = exports.index local indexes_gen = function(param, state) local x, gen_x, param_x = param[1], param[2], param[3] @@ -371,15 +487,16 @@ local indexes_gen = function(param, state) end local indexes = function(x, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) - return indexes_gen, {x, gen_x, param_x}, {0, state_x} -end - --- TODO: undocumented -local find = function(fun, gen, param, state) - local gen_x, param_x, state_x = filter(fun, gen, param, state) - return return_if_not_empty(gen_x(param_x, state_x)) + return wrap(indexes_gen, {x, gen, param}, {0, state}) end +methods.indexes = method1(indexes) +exports.indexes = export1(indexes) +methods.elem_indexes = methods.indexes +exports.elem_indexes = exports.indexes +methods.indices = methods.indexes +exports.indices = exports.indexes +methods.elem_indices = methods.indexes +exports.elem_indices = exports.indexes -------------------------------------------------------------------------------- -- Filtering @@ -423,9 +540,12 @@ local filter_gen = function(param, state_x) end local filter = function(fun, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) - return filter_gen, {fun, gen_x, param_x}, state_x + return wrap(filter_gen, {fun, gen, param}, state) end +methods.filter = method1(filter) +exports.filter = export1(filter) +methods.remove_if = methods.filter +exports.remove_if = exports.filter local grep = function(fun_or_regexp, gen, param, state) local fun = fun_or_regexp @@ -434,15 +554,18 @@ local grep = function(fun_or_regexp, gen, param, state) end return filter(fun, gen, param, state) end +methods.grep = method1(grep) +exports.grep = export1(grep) local partition = function(fun, gen, param, state) local neg_fun = function(...) return not fun(...) end - local gen_x, param_x, state_x = iter(gen, param, state) - return {filter(fun, gen_x, param_x, state_x)}, - {filter(neg_fun, gen_x, param_x, state_x)} + return filter(fun, gen, param, state), + filter(neg_fun, gen, param, state) end +methods.partition = method1(partition) +exports.partition = export1(partition) -------------------------------------------------------------------------------- -- Reducing @@ -455,8 +578,7 @@ local foldl_call = function(fun, start, state, ...) return state, fun(start, ...) end -local foldl = function(fun, start, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) +local foldl = function(fun, start, gen_x, param_x, state_x) while true do state_x, start = foldl_call(fun, start, gen_x(param_x, state_x)) if state_x == nil then @@ -465,9 +587,12 @@ local foldl = function(fun, start, gen, param, state) end return start end +methods.foldl = method2(foldl) +exports.foldl = export2(foldl) +methods.reduce = methods.foldl +exports.reduce = exports.foldl local length = function(gen, param, state) - local gen, param, state = iter(gen, param, state) if gen == ipairs or gen == string_gen then return #param end @@ -478,15 +603,18 @@ local length = function(gen, param, state) until state == nil return len - 1 end +methods.length = method0(length) +exports.length = export0(length) local is_null = function(gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) - return gen_x(param_x, deepcopy(state_x)) == nil + return gen(param, deepcopy(state)) == nil end +methods.is_null = method0(is_null) +exports.is_null = export0(is_null) local is_prefix_of = function(iter_x, iter_y) - local gen_x, param_x, state_x = iter_tab(iter_x) - local gen_y, param_y, state_y = iter_tab(iter_y) + local gen_x, param_x, state_x = iter(iter_x) + local gen_y, param_y, state_y = iter(iter_y) local r_x, r_y for i=1,10,1 do @@ -500,27 +628,34 @@ local is_prefix_of = function(iter_x, iter_y) end end end +methods.is_prefix_of = is_prefix_of +exports.is_prefix_of = is_prefix_of -local all = function(fun, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) +local all = function(fun, gen_x, param_x, state_x) local r repeat state_x, r = call_if_not_empty(fun, gen_x(param_x, state_x)) until state_x == nil or not r return state_x == nil end +methods.all = method1(all) +exports.all = export1(all) +methods.every = methods.all +exports.every = exports.all -local any = function(fun, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) +local any = function(fun, gen_x, param_x, state_x) local r repeat state_x, r = call_if_not_empty(fun, gen_x(param_x, state_x)) until state_x == nil or r return not not r end +methods.any = method1(any) +exports.any = export1(any) +methods.some = methods.any +exports.some = exports.any local sum = function(gen, param, state) - local gen, param, state = iter(gen, param, state) local s = 0 local r = 0 repeat @@ -529,9 +664,10 @@ local sum = function(gen, param, state) until state == nil return s end +methods.sum = method0(sum) +exports.sum = export0(sum) local product = function(gen, param, state) - local gen, param, state = iter(gen, param, state) local p = 1 local r = 1 repeat @@ -540,6 +676,8 @@ local product = function(gen, param, state) until state == nil return p end +methods.product = method0(product) +exports.product = export0(product) local min_cmp = function(m, n) if n < m then return n else return m end @@ -550,7 +688,6 @@ local max_cmp = function(m, n) end local min = function(gen, param, state) - local gen, param, state = iter(gen, param, state) local state, m = gen(param, state) if state == nil then error("min: iterator is empty") @@ -569,9 +706,12 @@ local min = function(gen, param, state) end return m end +methods.min = method0(min) +exports.min = export0(min) +methods.minimum = methods.min +exports.minimum = exports.min -local min_by = function(cmp, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) +local min_by = function(cmp, gen_x, param_x, state_x) local state_x, m = gen_x(param_x, state_x) if state_x == nil then error("min: iterator is empty") @@ -582,9 +722,12 @@ local min_by = function(cmp, gen, param, state) end return m end +methods.min_by = method1(min_by) +exports.min_by = export1(min_by) +methods.minimum_by = methods.min_by +exports.minimum_by = exports.min_by -local max = function(gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) +local max = function(gen_x, param_x, state_x) local state_x, m = gen_x(param_x, state_x) if state_x == nil then error("max: iterator is empty") @@ -603,9 +746,12 @@ local max = function(gen, param, state) end return m end +methods.max = method0(max) +exports.max = export0(max) +methods.maximum = methods.max +exports.maximum = exports.max -local max_by = function(cmp, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) +local max_by = function(cmp, gen_x, param_x, state_x) local state_x, m = gen_x(param_x, state_x) if state_x == nil then error("max: iterator is empty") @@ -616,9 +762,12 @@ local max_by = function(cmp, gen, param, state) end return m end +methods.max_by = method1(max_by) +exports.max_by = export1(max_by) +methods.maximum_by = methods.maximum_by +exports.maximum_by = exports.maximum_by -local totable = function(gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) +local totable = function(gen_x, param_x, state_x) local tab, key, val = {} while true do state_x, val = gen_x(param_x, state_x) @@ -629,9 +778,10 @@ local totable = function(gen, param, state) end return tab end +methods.totable = method0(totable) +exports.totable = export0(totable) -local tomap = function(gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) +local tomap = function(gen_x, param_x, state_x) local tab, key, val = {} while true do state_x, key, val = gen_x(param_x, state_x) @@ -642,6 +792,8 @@ local tomap = function(gen, param, state) end return tab end +methods.tomap = method0(tomap) +exports.tomap = export0(tomap) -------------------------------------------------------------------------------- -- Transformations @@ -653,9 +805,10 @@ local map_gen = function(param, state) end local map = function(fun, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) - return map_gen, {gen_x, param_x, fun}, state_x + return wrap(map_gen, {gen, param, fun}, state) end +methods.map = method1(map) +exports.map = export1(map) local enumerate_gen_call = function(state, i, state_x, ...) if state_x == nil then @@ -671,9 +824,10 @@ local enumerate_gen = function(param, state) end local enumerate = function(gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) - return enumerate_gen, {gen_x, param_x}, {0, state_x} + return wrap(enumerate_gen, {gen, param}, {1, state}) end +methods.enumerate = method0(enumerate) +exports.enumerate = export0(enumerate) local intersperse_call = function(i, state_x, ...) if state_x == nil then @@ -694,9 +848,10 @@ end -- TODO: interperse must not add x to the tail local intersperse = function(x, gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) - return intersperse_gen, {x, gen_x, param_x}, {0, state_x} + return wrap(intersperse_gen, {x, gen, param}, {0, state}) end +methods.intersperse = method1(intersperse) +exports.intersperse = export1(intersperse) -------------------------------------------------------------------------------- -- Compositions @@ -710,7 +865,6 @@ local function zip_gen_r(param, state, state_new, ...) local i = #state_new + 1 local gen_x, param_x = param[2 * i - 1], param[2 * i] local state_x, r = gen_x(param_x, state[i]) - -- print('i', i, 'state_x', state_x, 'r', r) if state_x == nil then return nil end @@ -722,25 +876,42 @@ local zip_gen = function(param, state) return zip_gen_r(param, state, {}) end -local zip = function(...) +-- A special hack for zip/chain to skip last two state, if a wrapped iterator +-- has been passed +local numargs = function(...) local n = select('#', ...) + if n >= 3 then + -- Fix last argument + local it = select(n - 2, ...) + if type(it) == 'table' and getmetatable(it) == iterator_mt and + it.param == select(n - 1, ...) and it.state == select(n, ...) then + return n - 2 + end + end + return n +end + +local zip = function(...) + local n = numargs(...) if n == 0 then - return nil_gen, nil, nil + return wrap(nil_gen, nil, nil) end local param = { [2 * n] = 0 } local state = { [n] = 0 } local i, gen_x, param_x, state_x for i=1,n,1 do - local elem = select(n - i + 1, ...) - gen_x, param_x, state_x = iter_tab(elem) + local it = select(n - i + 1, ...) + gen_x, param_x, state_x = rawiter(it) param[2 * i - 1] = gen_x param[2 * i] = param_x state[i] = state_x end - return zip_gen, param, state + return wrap(zip_gen, param, state) end +methods.zip = zip +exports.zip = zip local cycle_gen_call = function(param, state_x, ...) if state_x == nil then @@ -756,9 +927,10 @@ local cycle_gen = function(param, state_x) end local cycle = function(gen, param, state) - local gen_x, param_x, state_x = iter(gen, param, state) - return cycle_gen, {gen_x, param_x, state_x}, deepcopy(state_x) + return wrap(cycle_gen, {gen, param, state}, deepcopy(state)) end +methods.cycle = method0(cycle) +exports.cycle = export0(cycle) -- call each other local chain_gen_r1 @@ -782,23 +954,25 @@ chain_gen_r1 = function(param, state) end local chain = function(...) - local n = select('#', ...) + local n = numargs(...) if n == 0 then - return nil_gen, nil, nil + return wrap(nil_gen, nil, nil) end local param = { [3 * n] = 0 } local i, gen_x, param_x, state_x for i=1,n,1 do local elem = select(i, ...) - gen_x, param_x, state_x = iter_tab(elem) + gen_x, param_x, state_x = iter(elem) param[3 * i - 2] = gen_x param[3 * i - 1] = param_x param[3 * i] = state_x end - return chain_gen_r1, param, {1, param[3]} + return wrap(chain_gen_r1, param, {1, param[3]}) end +methods.chain = chain +exports.chain = chain -------------------------------------------------------------------------------- -- Operators @@ -848,116 +1022,15 @@ operator = { lnot = function(a) return not a end, truth = function(a) return not not a end, } +exports.operator = operator +methods.operator = operator +exports.op = operator +methods.op = operator -------------------------------------------------------------------------------- -- module definitions -------------------------------------------------------------------------------- -local exports = { - ---------------------------------------------------------------------------- - -- Basic - ---------------------------------------------------------------------------- - iter = iter, - each = each, - for_each = each, -- an alias - foreach = each, -- an alias - - ---------------------------------------------------------------------------- - -- Generators - ---------------------------------------------------------------------------- - range = range, - duplicate = duplicate, - xrepeat = duplicate, -- an alias - replicate = duplicate, -- an alias - tabulate = tabulate, - ones = ones, - zeros = zeros, - rands = rands, - - ---------------------------------------------------------------------------- - -- Slicing - ---------------------------------------------------------------------------- - nth = nth, - head = head, - car = head, -- an alias - tail = tail, - cdr = tail, -- an alias - take_n = take_n, - take_while = take_while, - take = take, - drop_n = drop_n, - drop_while = drop_while, - drop = drop, - split = split, - split_at = split, -- an alias - span = split, -- an alias - - ---------------------------------------------------------------------------- - -- Indexing - ---------------------------------------------------------------------------- - index = index, - index_of = index, -- an alias - elem_index = index, -- an alias - indexes = indexes, - indices = indexes, -- an alias - elem_indexes = indexes, -- an alias - elem_indices = indexes, -- an alias - find = find, - - ---------------------------------------------------------------------------- - -- Filtering - ---------------------------------------------------------------------------- - filter = filter, - remove_if = filter, -- an alias - grep = grep, - partition = partition, - - ---------------------------------------------------------------------------- - -- Reducing - ---------------------------------------------------------------------------- - foldl = foldl, - reduce = foldl, -- an alias - length = length, - is_null = is_null, - is_prefix_of = is_prefix_of, - all = all, - every = all, -- an alias - any = any, - some = any, -- an alias - sum = sum, - product = product, - min = min, - minimum = min, -- an alias - min_by = min_by, - minimum_by = min_by, -- an alias - max = max, - maximum = max, -- an alias - max_by = max_by, - maximum_by = max_by, -- an alias - totable = totable, - tomap = tomap, - - ---------------------------------------------------------------------------- - -- Transformations - ---------------------------------------------------------------------------- - map = map, - enumerate = enumerate, - intersperse = intersperse, - - ---------------------------------------------------------------------------- - -- Compositions - ---------------------------------------------------------------------------- - zip = zip, - cycle = cycle, - chain = chain, - - ---------------------------------------------------------------------------- - -- Operators - ---------------------------------------------------------------------------- - operator = operator, - op = operator -- an alias -} - -- a special syntax sugar to export all functions to the global table setmetatable(exports, { __call = function(t) |