prosody
ca74d8ed1a15
util/array.lua

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util/array.lua @ 4449:ca74d8ed1a15

util.array: Avoid globals.
author Waqas Hussain <waqas20@gmail.com>
date Fri, 09 Dec 2011 12:02:21 +0500
parent 4448:d745f4c28294
child 5085:cbc7eb5cfa8c
comparison
equal deleted inserted replaced
4448:d745f4c28294 4449:ca74d8ed1a15
6 -- COPYING file in the source package for more information. 6 -- COPYING file in the source package for more information.
7 -- 7 --
8 8
9 local t_insert, t_sort, t_remove, t_concat 9 local t_insert, t_sort, t_remove, t_concat
10 = table.insert, table.sort, table.remove, table.concat; 10 = table.insert, table.sort, table.remove, table.concat;
11
12 local setmetatable = setmetatable;
13 local math_random = math.random;
14 local pairs, ipairs = pairs, ipairs;
15 local tostring = tostring;
11 16
12 local array = {}; 17 local array = {};
13 local array_base = {}; 18 local array_base = {};
14 local array_methods = {}; 19 local array_methods = {};
15 local array_mt = { __index = array_methods, __tostring = function (array) return array:concat(", "); end }; 20 local array_mt = { __index = array_methods, __tostring = function (array) return array:concat(", "); end };
25 30
26 setmetatable(array, { __call = new_array }); 31 setmetatable(array, { __call = new_array });
27 32
28 -- Read-only methods 33 -- Read-only methods
29 function array_methods:random() 34 function array_methods:random()
30 return self[math.random(1,#self)]; 35 return self[math_random(1,#self)];
31 end 36 end
32 37
33 -- These methods can be called two ways: 38 -- These methods can be called two ways:
34 -- array.method(existing_array, [params [, ...]]) -- Create new array for result 39 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
35 -- existing_array:method([params, ...]) -- Transform existing array into result 40 -- existing_array:method([params, ...]) -- Transform existing array into result
78 83
79 --- These methods only mutate the array 84 --- These methods only mutate the array
80 function array_methods:shuffle(outa, ina) 85 function array_methods:shuffle(outa, ina)
81 local len = #self; 86 local len = #self;
82 for i=1,#self do 87 for i=1,#self do
83 local r = math.random(i,len); 88 local r = math_random(i,len);
84 self[i], self[r] = self[r], self[i]; 89 self[i], self[r] = self[r], self[i];
85 end 90 end
86 return self; 91 return self;
87 end 92 end
88 93
102 end 107 end
103 return self; 108 return self;
104 end 109 end
105 110
106 function array_methods:push(x) 111 function array_methods:push(x)
107 table.insert(self, x); 112 t_insert(self, x);
108 return self; 113 return self;
109 end 114 end
110 115
111 function array_methods:pop(x) 116 function array_methods:pop(x)
112 local v = self[x]; 117 local v = self[x];
113 table.remove(self, x); 118 t_remove(self, x);
114 return v; 119 return v;
115 end 120 end
116 121
117 function array_methods:concat(sep) 122 function array_methods:concat(sep)
118 return table.concat(array.map(self, tostring), sep); 123 return t_concat(array.map(self, tostring), sep);
119 end 124 end
120 125
121 function array_methods:length() 126 function array_methods:length()
122 return #self; 127 return #self;
123 end 128 end
126 function array.collect(f, s, var) 131 function array.collect(f, s, var)
127 local t = {}; 132 local t = {};
128 while true do 133 while true do
129 var = f(s, var); 134 var = f(s, var);
130 if var == nil then break; end 135 if var == nil then break; end
131 table.insert(t, var); 136 t_insert(t, var);
132 end 137 end
133 return setmetatable(t, array_mt); 138 return setmetatable(t, array_mt);
134 end 139 end
135 140
136 --- 141 ---