prosody
1af7cc3b9747
util/array.lua

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util/array.lua @ 9528:1af7cc3b9747

util.array: Break long line
author Matthew Wild <mwild1@gmail.com>
date Fri, 19 Oct 2018 13:31:00 +0100
parent 9487:4e38121a349d
child 9529:6a1e7723208b
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rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local t_insert, t_sort, t_remove, t_concat
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10 = table.insert, table.sort, table.remove, table.concat;
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11
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12 local setmetatable = setmetatable;
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13 local math_random = math.random;
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14 local math_floor = math.floor;
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15 local pairs, ipairs = pairs, ipairs;
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16 local tostring = tostring;
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17 local type = type;
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19 local array = {};
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20 local array_base = {};
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21 local array_methods = {};
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22 local array_mt = {
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23 __index = array_methods;
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24 __name = "array";
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25 __tostring = function (self) return "{"..self:concat(", ").."}"; end;
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26 };
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27
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28 function array_mt:__freeze() return self; end
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29
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30 local function new_array(self, t, _s, _var)
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31 if type(t) == "function" then -- Assume iterator
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32 t = self.collect(t, _s, _var);
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33 end
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34 return setmetatable(t or {}, array_mt);
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35 end
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36
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37 function array_mt.__add(a1, a2)
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38 local res = new_array();
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39 return res:append(a1):append(a2);
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40 end
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41
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42 function array_mt.__eq(a, b)
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43 if #a == #b then
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44 for i = 1, #a do
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45 if a[i] ~= b[i] then
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46 return false;
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47 end
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48 end
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49 else
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50 return false;
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51 end
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52 return true;
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53 end
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54
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55 setmetatable(array, { __call = new_array });
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56
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57 -- Read-only methods
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58 function array_methods:random()
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59 return self[math_random(1, #self)];
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60 end
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61
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62 -- These methods can be called two ways:
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63 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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64 -- existing_array:method([params, ...]) -- Transform existing array into result
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65 --
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66 function array_base.map(outa, ina, func)
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67 for k, v in ipairs(ina) do
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68 outa[k] = func(v);
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69 end
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70 return outa;
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71 end
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72
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73 function array_base.filter(outa, ina, func)
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74 local inplace, start_length = ina == outa, #ina;
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75 local write = 1;
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76 for read = 1, start_length do
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77 local v = ina[read];
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78 if func(v) then
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79 outa[write] = v;
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80 write = write + 1;
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81 end
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82 end
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83
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84 if inplace and write <= start_length then
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85 for i = write, start_length do
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86 outa[i] = nil;
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87 end
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88 end
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89
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90 return outa;
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91 end
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92
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93 function array_base.sort(outa, ina, ...)
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94 if ina ~= outa then
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95 outa:append(ina);
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96 end
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97 t_sort(outa, ...);
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98 return outa;
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99 end
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100
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101 function array_base.unique(outa, ina)
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102 local seen = {};
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103 return array_base.filter(outa, ina, function (item)
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104 if seen[item] then
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105 return false;
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106 else
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107 seen[item] = true;
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108 return true;
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109 end
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110 end);
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111 end
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112
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113 function array_base.pluck(outa, ina, key)
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114 for i = 1, #ina do
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115 outa[i] = ina[i][key];
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116 end
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117 return outa;
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118 end
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119
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120 function array_base.reverse(outa, ina)
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121 local len = #ina;
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122 if ina == outa then
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123 local middle = math_floor(len/2);
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124 len = len + 1;
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125 local o; -- opposite
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126 for i = 1, middle do
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127 o = len - i;
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128 outa[i], outa[o] = outa[o], outa[i];
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129 end
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130 else
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131 local off = len + 1;
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132 for i = 1, len do
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133 outa[i] = ina[off - i];
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134 end
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135 end
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136 return outa;
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137 end
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138
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139 --- These methods only mutate the array
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140 function array_methods:shuffle()
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141 local len = #self;
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142 for i = 1, #self do
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143 local r = math_random(i, len);
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144 self[i], self[r] = self[r], self[i];
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145 end
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146 return self;
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147 end
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148
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149 function array_methods:append(ina)
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150 local len, len2 = #self, #ina;
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151 for i = 1, len2 do
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152 self[len+i] = ina[i];
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153 end
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154 return self;
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155 end
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156
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157 function array_methods:push(x)
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158 t_insert(self, x);
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159 return self;
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160 end
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161
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162 array_methods.pop = t_remove;
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163
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164 function array_methods:concat(sep)
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165 return t_concat(array.map(self, tostring), sep);
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166 end
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167
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168 function array_methods:length()
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169 return #self;
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170 end
1905
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171
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172 --- These methods always create a new array
1027
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173 function array.collect(f, s, var)
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06161b0b83f2 util.array: Fix array.collect() for iterators that expect initial value of var to be preserved
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174 local t = {};
1027
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175 while true do
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176 var = f(s, var);
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177 if var == nil then break; end
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178 t_insert(t, var);
1027
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179 end
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180 return setmetatable(t, array_mt);
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181 end
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182
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183 ---
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184
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185 -- Setup methods from array_base
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186 for method, f in pairs(array_base) do
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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187 local base_method = f;
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188 -- Setup global array method which makes new array
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189 array[method] = function (old_a, ...)
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190 local a = new_array();
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191 return base_method(a, old_a, ...);
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
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192 end
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diff changeset
193 -- Setup per-array (mutating) method
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parents: 1522
diff changeset
194 array_methods[method] = function (self, ...)
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parents: 1522
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195 return base_method(self, self, ...);
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parents: 1522
diff changeset
196 end
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197 end
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diff changeset
198
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parents: 922
diff changeset
199 return array;