author | Kim Alvefur <zash@zash.se> |
Wed, 23 Dec 2015 08:39:22 +0100 | |
changeset 7023 | 6ab9c691c4c6 |
parent 7022 | abcd5ec3ee41 |
child 7702 | 9c40d0be2295 |
permissions | -rw-r--r-- |
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-- Prosody IM |
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-- Copyright (C) 2008-2010 Matthew Wild |
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-- Copyright (C) 2008-2010 Waqas Hussain |
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-- |
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-- This project is MIT/X11 licensed. Please see the |
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-- COPYING file in the source package for more information. |
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-- |
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local t_insert, t_sort, t_remove, t_concat |
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= table.insert, table.sort, table.remove, table.concat; |
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local setmetatable = setmetatable; |
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local math_random = math.random; |
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local math_floor = math.floor; |
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local pairs, ipairs = pairs, ipairs; |
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local tostring = tostring; |
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local type = type; |
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local array = {}; |
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local array_base = {}; |
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local array_methods = {}; |
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local array_mt = { __index = array_methods, __tostring = function (array) return "{"..array:concat(", ").."}"; end }; |
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local function new_array(self, t, _s, _var) |
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if type(t) == "function" then -- Assume iterator |
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t = self.collect(t, _s, _var); |
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end |
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return setmetatable(t or {}, array_mt); |
29 |
end |
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function array_mt.__add(a1, a2) |
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local res = new_array(); |
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return res:append(a1):append(a2); |
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end |
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setmetatable(array, { __call = new_array }); |
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-- Read-only methods |
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function array_methods:random() |
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return self[math_random(1, #self)]; |
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end |
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-- These methods can be called two ways: |
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-- array.method(existing_array, [params [, ...]]) -- Create new array for result |
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-- existing_array:method([params, ...]) -- Transform existing array into result |
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-- |
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function array_base.map(outa, ina, func) |
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for k, v in ipairs(ina) do |
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outa[k] = func(v); |
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end |
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return outa; |
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end |
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function array_base.filter(outa, ina, func) |
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local inplace, start_length = ina == outa, #ina; |
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local write = 1; |
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for read = 1, start_length do |
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local v = ina[read]; |
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if func(v) then |
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outa[write] = v; |
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write = write + 1; |
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end |
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end |
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if inplace and write <= start_length then |
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for i = write, start_length do |
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outa[i] = nil; |
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end |
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end |
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return outa; |
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end |
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function array_base.sort(outa, ina, ...) |
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if ina ~= outa then |
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outa:append(ina); |
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end |
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t_sort(outa, ...); |
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return outa; |
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end |
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function array_base.pluck(outa, ina, key) |
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for i = 1, #ina do |
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outa[i] = ina[i][key]; |
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end |
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return outa; |
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end |
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|
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function array_base.reverse(outa, ina) |
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local len = #ina; |
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if ina == outa then |
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local middle = math_floor(len/2); |
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len = len + 1; |
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local o; -- opposite |
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for i = 1, middle do |
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o = len - i; |
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outa[i], outa[o] = outa[o], outa[i]; |
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98 |
end |
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99 |
else |
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100 |
local off = len + 1; |
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for i = 1, len do |
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102 |
outa[i] = ina[off - i]; |
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103 |
end |
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104 |
end |
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105 |
return outa; |
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106 |
end |
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107 |
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--- These methods only mutate the array |
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109 |
function array_methods:shuffle(outa, ina) |
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local len = #self; |
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111 |
for i = 1, #self do |
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112 |
local r = math_random(i, len); |
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self[i], self[r] = self[r], self[i]; |
114 |
end |
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115 |
return self; |
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end |
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function array_methods:append(array) |
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119 |
local len, len2 = #self, #array; |
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120 |
for i = 1, len2 do |
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self[len+i] = array[i]; |
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122 |
end |
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123 |
return self; |
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124 |
end |
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125 |
|
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126 |
function array_methods:push(x) |
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t_insert(self, x); |
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128 |
return self; |
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129 |
end |
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130 |
|
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array_methods.pop = t_remove; |
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132 |
|
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133 |
function array_methods:concat(sep) |
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134 |
return t_concat(array.map(self, tostring), sep); |
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135 |
end |
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136 |
|
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137 |
function array_methods:length() |
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138 |
return #self; |
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139 |
end |
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140 |
|
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141 |
--- These methods always create a new array |
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142 |
function array.collect(f, s, var) |
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143 |
local t = {}; |
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144 |
while true do |
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145 |
var = f(s, var); |
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146 |
if var == nil then break; end |
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147 |
t_insert(t, var); |
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148 |
end |
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149 |
return setmetatable(t, array_mt); |
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150 |
end |
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151 |
|
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152 |
--- |
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153 |
|
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154 |
-- Setup methods from array_base |
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155 |
for method, f in pairs(array_base) do |
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156 |
local base_method = f; |
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157 |
-- Setup global array method which makes new array |
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158 |
array[method] = function (old_a, ...) |
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159 |
local a = new_array(); |
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160 |
return base_method(a, old_a, ...); |
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161 |
end |
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162 |
-- Setup per-array (mutating) method |
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163 |
array_methods[method] = function (self, ...) |
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164 |
return base_method(self, self, ...); |
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165 |
end |
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166 |
end |
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167 |
|
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168 |
return array; |