prosody
d36fa7d164c0
util/array.lua

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util/array.lua @ 9344:d36fa7d164c0

mod_scansion_record: Unfinished code dump from Matthew
author Kim Alvefur <zash@zash.se>
date Sat, 22 Sep 2018 13:50:00 +0200
parent 8521:6f5ce0f09f40
child 9487:4e38121a349d
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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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18
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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 = { __index = array_methods, __name = "array", __tostring = function (self) return "{"..self:concat(", ").."}"; end };
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24 local function new_array(self, t, _s, _var)
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25 if type(t) == "function" then -- Assume iterator
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26 t = self.collect(t, _s, _var);
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27 end
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28 return setmetatable(t or {}, array_mt);
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29 end
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30
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31 function array_mt.__add(a1, a2)
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32 local res = new_array();
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33 return res:append(a1):append(a2);
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34 end
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35
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36 function array_mt.__eq(a, b)
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37 if #a == #b then
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38 for i = 1, #a do
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39 if a[i] ~= b[i] then
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40 return false;
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41 end
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42 end
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43 else
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44 return false;
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45 end
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46 return true;
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47 end
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48
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49 setmetatable(array, { __call = new_array });
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50
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51 -- Read-only methods
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52 function array_methods:random()
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53 return self[math_random(1, #self)];
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54 end
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55
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56 -- These methods can be called two ways:
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57 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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58 -- existing_array:method([params, ...]) -- Transform existing array into result
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59 --
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60 function array_base.map(outa, ina, func)
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61 for k, v in ipairs(ina) do
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62 outa[k] = func(v);
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63 end
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64 return outa;
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65 end
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66
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67 function array_base.filter(outa, ina, func)
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68 local inplace, start_length = ina == outa, #ina;
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69 local write = 1;
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70 for read = 1, start_length do
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71 local v = ina[read];
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72 if func(v) then
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73 outa[write] = v;
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74 write = write + 1;
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75 end
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76 end
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77
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78 if inplace and write <= start_length then
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79 for i = write, start_length do
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80 outa[i] = nil;
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81 end
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82 end
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83
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84 return outa;
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85 end
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86
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87 function array_base.sort(outa, ina, ...)
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88 if ina ~= outa then
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89 outa:append(ina);
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90 end
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91 t_sort(outa, ...);
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92 return outa;
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93 end
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94
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95 function array_base.unique(outa, ina)
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96 local seen = {};
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97 return array_base.filter(outa, ina, function (item)
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98 if seen[item] then
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99 return false;
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100 else
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101 seen[item] = true;
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102 return true;
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103 end
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104 end);
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105 end
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106
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107 function array_base.pluck(outa, ina, key)
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108 for i = 1, #ina do
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109 outa[i] = ina[i][key];
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110 end
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111 return outa;
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112 end
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113
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114 function array_base.reverse(outa, ina)
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115 local len = #ina;
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116 if ina == outa then
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117 local middle = math_floor(len/2);
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118 len = len + 1;
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119 local o; -- opposite
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120 for i = 1, middle do
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121 o = len - i;
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122 outa[i], outa[o] = outa[o], outa[i];
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123 end
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124 else
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125 local off = len + 1;
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126 for i = 1, len do
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127 outa[i] = ina[off - i];
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128 end
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129 end
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130 return outa;
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131 end
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132
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133 --- These methods only mutate the array
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134 function array_methods:shuffle()
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135 local len = #self;
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136 for i = 1, #self do
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137 local r = math_random(i, len);
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138 self[i], self[r] = self[r], self[i];
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139 end
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140 return self;
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141 end
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142
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143 function array_methods:append(ina)
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144 local len, len2 = #self, #ina;
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145 for i = 1, len2 do
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146 self[len+i] = ina[i];
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147 end
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148 return self;
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149 end
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150
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151 function array_methods:push(x)
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152 t_insert(self, x);
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153 return self;
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154 end
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155
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156 array_methods.pop = t_remove;
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157
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158 function array_methods:concat(sep)
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159 return t_concat(array.map(self, tostring), sep);
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160 end
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161
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162 function array_methods:length()
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163 return #self;
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164 end
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165
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166 --- These methods always create a new array
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167 function array.collect(f, s, var)
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168 local t = {};
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169 while true do
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170 var = f(s, var);
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171 if var == nil then break; end
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172 t_insert(t, var);
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173 end
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174 return setmetatable(t, array_mt);
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175 end
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176
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177 ---
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178
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179 -- Setup methods from array_base
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180 for method, f in pairs(array_base) do
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181 local base_method = f;
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182 -- Setup global array method which makes new array
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183 array[method] = function (old_a, ...)
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184 local a = new_array();
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185 return base_method(a, old_a, ...);
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186 end
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187 -- Setup per-array (mutating) method
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188 array_methods[method] = function (self, ...)
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189 return base_method(self, self, ...);
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parents: 1522
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190 end
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191 end
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192
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193 return array;