1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
-- 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 (array) return "{"..array: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(array)
local len,len2 = #self, #array;
for i=1,len2 do
self[len+i] = array[i];
end
return self;
end
function array_methods:push(x)
t_insert(self, x);
return self;
end
function array_methods:pop(x)
local v = self[x];
t_remove(self, x);
return v;
end
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;
|
