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|
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local t_insert, t_sort, t_remove, t_concat
= table.insert, table.sort, table.remove, table.concat;
local setmetatable = setmetatable;
local math_random = math.random;
local math_floor = math.floor;
local pairs, ipairs = pairs, ipairs;
local tostring = tostring;
local type = type;
local array = {};
local array_base = {};
local array_methods = {};
local array_mt = { __index = array_methods, __tostring = function (self) return "{"..self:concat(", ").."}"; end };
local function new_array(self, t, _s, _var)
if type(t) == "function" then -- Assume iterator
t = self.collect(t, _s, _var);
end
return setmetatable(t or {}, array_mt);
end
function array_mt.__add(a1, a2)
local res = new_array();
return res:append(a1):append(a2);
end
setmetatable(array, { __call = new_array });
-- Read-only methods
function array_methods:random()
return self[math_random(1, #self)];
end
-- These methods can be called two ways:
-- array.method(existing_array, [params [, ...]]) -- Create new array for result
-- existing_array:method([params, ...]) -- Transform existing array into result
--
function array_base.map(outa, ina, func)
for k, v in ipairs(ina) do
outa[k] = func(v);
end
return outa;
end
function array_base.filter(outa, ina, func)
local inplace, start_length = ina == outa, #ina;
local write = 1;
for read = 1, start_length do
local v = ina[read];
if func(v) then
outa[write] = v;
write = write + 1;
end
end
if inplace and write <= start_length then
for i = write, start_length do
outa[i] = nil;
end
end
return outa;
end
function array_base.sort(outa, ina, ...)
if ina ~= outa then
outa:append(ina);
end
t_sort(outa, ...);
return outa;
end
function array_base.pluck(outa, ina, key)
for i = 1, #ina do
outa[i] = ina[i][key];
end
return outa;
end
function array_base.reverse(outa, ina)
local len = #ina;
if ina == outa then
local middle = math_floor(len/2);
len = len + 1;
local o; -- opposite
for i = 1, middle do
o = len - i;
outa[i], outa[o] = outa[o], outa[i];
end
else
local off = len + 1;
for i = 1, len do
outa[i] = ina[off - i];
end
end
return outa;
end
--- These methods only mutate the array
function array_methods:shuffle(outa, ina)
local len = #self;
for i = 1, #self do
local r = math_random(i, len);
self[i], self[r] = self[r], self[i];
end
return self;
end
function array_methods:append(ina)
local len, len2 = #self, #ina;
for i = 1, len2 do
self[len+i] = ina[i];
end
return self;
end
function array_methods:push(x)
t_insert(self, x);
return self;
end
array_methods.pop = t_remove;
function array_methods:concat(sep)
return t_concat(array.map(self, tostring), sep);
end
function array_methods:length()
return #self;
end
--- These methods always create a new array
function array.collect(f, s, var)
local t = {};
while true do
var = f(s, var);
if var == nil then break; end
t_insert(t, var);
end
return setmetatable(t, array_mt);
end
---
-- Setup methods from array_base
for method, f in pairs(array_base) do
local base_method = f;
-- Setup global array method which makes new array
array[method] = function (old_a, ...)
local a = new_array();
return base_method(a, old_a, ...);
end
-- Setup per-array (mutating) method
array_methods[method] = function (self, ...)
return base_method(self, self, ...);
end
end
return array;
|
