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3 -- public domain 20080410 lua@ztact.com
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4
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5
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6 pcall (require, 'lfs') -- lfs may not be installed/necessary.
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7 pcall (require, 'pozix') -- pozix may not be installed/necessary.
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8
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9
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10 local getfenv, ipairs, next, pairs, pcall, require, select, tostring, type =
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11 getfenv, ipairs, next, pairs, pcall, require, select, tostring, type
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12 local unpack, xpcall =
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13 unpack, xpcall
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14
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15 local io, lfs, os, string, table, pozix = io, lfs, os, string, table, pozix
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16
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17 local assert, print = assert, print
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18
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19 local error = error
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20
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21
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22 module ((...) or 'ztact') ------------------------------------- module ztact
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23
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24
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25 -- dir -------------------------------------------------------------------- dir
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26
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27
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28 function dir (path) -- - - - - - - - - - - - - - - - - - - - - - - - - - dir
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29 local it = lfs.dir (path)
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30 return function ()
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31 repeat
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32 local dir = it ()
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33 if dir ~= '.' and dir ~= '..' then return dir end
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34 until not dir
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35 end end
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36
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37
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38 function is_file (path) -- - - - - - - - - - - - - - - - - - is_file (path)
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39 local mode = lfs.attributes (path, 'mode')
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40 return mode == 'file' and path
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41 end
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42
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43
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44 -- network byte ordering -------------------------------- network byte ordering
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45
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46
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47 function htons (word) -- - - - - - - - - - - - - - - - - - - - - - - - htons
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48 return (word-word%0x100)/0x100, word%0x100
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49 end
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50
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51
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52 -- pcall2 -------------------------------------------------------------- pcall2
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53
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54
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55 getfenv ().pcall = pcall -- store the original pcall as ztact.pcall
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56
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57
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58 local argc, argv, errorhandler, pcall2_f
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59
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60
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61 local function _pcall2 () -- - - - - - - - - - - - - - - - - - - - - _pcall2
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62 local tmpv = argv
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63 argv = nil
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64 return pcall2_f (unpack (tmpv, 1, argc))
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65 end
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66
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67
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68 function seterrorhandler (func) -- - - - - - - - - - - - - - seterrorhandler
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69 errorhandler = func
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70 end
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71
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72
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73 function pcall2 (f, ...) -- - - - - - - - - - - - - - - - - - - - - - pcall2
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74
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75 pcall2_f = f
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76 argc = select ('#', ...)
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77 argv = { ... }
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78
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79 if not errorhandler then
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80 local debug = require ('debug')
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81 errorhandler = debug.traceback
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82 end
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83
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84 return xpcall (_pcall2, errorhandler)
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85 end
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86
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87
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88 function append (t, ...) -- - - - - - - - - - - - - - - - - - - - - - append
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89 local insert = table.insert
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90 for i,v in ipairs {...} do
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91 insert (t, v)
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92 end end
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93
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94
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95 function print_r (d, indent) -- - - - - - - - - - - - - - - - - - - print_r
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96 local rep = string.rep (' ', indent or 0)
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97 if type (d) == 'table' then
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98 for k,v in pairs (d) do
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99 if type (v) == 'table' then
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100 io.write (rep, k, '\n')
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101 print_r (v, (indent or 0) + 1)
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102 else io.write (rep, k, ' = ', tostring (v), '\n') end
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103 end
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104 else io.write (d, '\n') end
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105 end
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106
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107
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108 function tohex (s) -- - - - - - - - - - - - - - - - - - - - - - - - - tohex
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109 return string.format (string.rep ('%02x ', #s), string.byte (s, 1, #s))
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110 end
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111
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112
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113 function tostring_r (d, indent, tab0) -- - - - - - - - - - - - - tostring_r
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114
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115 tab1 = tab0 or {}
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116 local rep = string.rep (' ', indent or 0)
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117 if type (d) == 'table' then
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118 for k,v in pairs (d) do
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119 if type (v) == 'table' then
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120 append (tab1, rep, k, '\n')
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121 tostring_r (v, (indent or 0) + 1, tab1)
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122 else append (tab1, rep, k, ' = ', tostring (v), '\n') end
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123 end
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124 else append (tab1, d, '\n') end
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125
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126 if not tab0 then return table.concat (tab1) end
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127 end
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128
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129
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130 -- queue manipulation -------------------------------------- queue manipulation
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131
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132
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133 -- Possible queue states. 1 (i.e. queue.p[1]) is head of queue.
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134 --
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135 -- 1..2
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136 -- 3..4 1..2
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137 -- 3..4 1..2 5..6
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138 -- 1..2 5..6
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139 -- 1..2
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140
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141
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142 local function print_queue (queue, ...) -- - - - - - - - - - - - print_queue
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143 for i=1,10 do io.write ((queue[i] or '.')..' ') end
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144 io.write ('\t')
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145 for i=1,6 do io.write ((queue.p[i] or '.')..' ') end
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146 print (...)
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147 end
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148
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149
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150 function dequeue (queue) -- - - - - - - - - - - - - - - - - - - - - dequeue
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151
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152 local p = queue.p
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153 if not p and queue[1] then queue.p = { 1, #queue } p = queue.p end
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154
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155 if not p[1] then return nil end
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156
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157 local element = queue[p[1]]
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158 queue[p[1]] = nil
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159
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160 if p[1] < p[2] then p[1] = p[1] + 1
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161
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162 elseif p[4] then p[1], p[2], p[3], p[4] = p[3], p[4], nil, nil
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163
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164 elseif p[5] then p[1], p[2], p[5], p[6] = p[5], p[6], nil, nil
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165
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166 else p[1], p[2] = nil, nil end
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167
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168 print_queue (queue, ' de '..element)
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169 return element
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170 end
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171
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172
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173 function enqueue (queue, element) -- - - - - - - - - - - - - - - - - enqueue
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174
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175 local p = queue.p
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176 if not p then queue.p = {} p = queue.p end
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177
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178 if p[5] then -- p3..p4 p1..p2 p5..p6
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179 p[6] = p[6]+1
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180 queue[p[6]] = element
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181
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182 elseif p[3] then -- p3..p4 p1..p2
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183
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184 if p[4]+1 < p[1] then
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185 p[4] = p[4] + 1
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186 queue[p[4]] = element
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187
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188 else
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189 p[5] = p[2]+1
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190 p[6], queue[p[5]] = p[5], element
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191 end
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192
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193 elseif p[1] then -- p1..p2
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194 if p[1] == 1 then
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195 p[2] = p[2] + 1
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196 queue[p[2]] = element
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197
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198 else
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199 p[3], p[4], queue[1] = 1, 1, element
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200 end
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201
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202 else -- empty queue
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203 p[1], p[2], queue[1] = 1, 1, element
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204 end
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205
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206 print_queue (queue, ' '..element)
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207 end
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208
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209
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210 local function test_queue ()
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211 t = {}
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212 enqueue (t, 1)
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213 enqueue (t, 2)
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214 enqueue (t, 3)
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215 enqueue (t, 4)
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216 enqueue (t, 5)
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217 dequeue (t)
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218 dequeue (t)
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219 enqueue (t, 6)
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220 enqueue (t, 7)
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221 enqueue (t, 8)
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222 enqueue (t, 9)
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223 dequeue (t)
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224 dequeue (t)
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225 dequeue (t)
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226 dequeue (t)
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227 enqueue (t, 'a')
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228 dequeue (t)
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229 enqueue (t, 'b')
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230 enqueue (t, 'c')
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231 dequeue (t)
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232 dequeue (t)
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233 dequeue (t)
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234 dequeue (t)
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235 dequeue (t)
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236 enqueue (t, 'd')
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237 dequeue (t)
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238 dequeue (t)
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239 dequeue (t)
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240 end
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241
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242
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243 -- test_queue ()
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244
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245
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246 function queue_len (queue)
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247 end
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248
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249
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250 function queue_peek (queue)
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251 end
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252
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253
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254 -- tree manipulation ---------------------------------------- tree manipulation
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255
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256
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257 function set (parent, ...) --- - - - - - - - - - - - - - - - - - - - - - set
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258
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259 -- print ('set', ...)
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260
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261 local len = select ('#', ...)
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262 local key, value = select (len-1, ...)
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263 local cutpoint, cutkey
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264
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265 for i=1,len-2 do
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266
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267 local key = select (i, ...)
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268 local child = parent[key]
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269
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270 if value == nil then
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271 if child == nil then return
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272 elseif next (child, next (child)) then cutpoint = nil cutkey = nil
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273 elseif cutpoint == nil then cutpoint = parent cutkey = key end
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274
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275 elseif child == nil then child = {} parent[key] = child end
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276
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277 parent = child
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278 end
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279
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280 if value == nil and cutpoint then cutpoint[cutkey] = nil
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281 else parent[key] = value return value end
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282 end
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283
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284
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285 function get (parent, ...) --- - - - - - - - - - - - - - - - - - - - - - get
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286 local len = select ('#', ...)
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287 for i=1,len do
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288 parent = parent[select (i, ...)]
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289 if parent == nil then break end
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290 end
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291 return parent
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292 end
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293
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294
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295 -- misc ------------------------------------------------------------------ misc
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296
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297
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298 function find (path, ...) --------------------------------------------- find
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299
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300 local dirs, operators = { path }, {...}
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301 for operator in ivalues (operators) do
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302 if not operator (path) then break end end
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303
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304 while next (dirs) do
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305 local parent = table.remove (dirs)
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306 for child in assert (pozix.opendir (parent)) do
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307 if child and child ~= '.' and child ~= '..' then
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308 local path = parent..'/'..child
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309 if pozix.stat (path, 'is_dir') then table.insert (dirs, path) end
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310 for operator in ivalues (operators) do
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311 if not operator (path) then break end end
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312 end end end end
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313
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314
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315 function ivalues (t) ----------------------------------------------- ivalues
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316 local i = 0
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317 return function () if t[i+1] then i = i + 1 return t[i] end end
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318 end
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319
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320
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321 function lson_encode (mixed, f, indent, indents) --------------- lson_encode
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322
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323
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324 local capture
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325 if not f then
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326 capture = {}
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327 f = function (s) append (capture, s) end
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328 end
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329
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330 indent = indent or 0
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331 indents = indents or {}
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332 indents[indent] = indents[indent] or string.rep (' ', 2*indent)
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333
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334 local type = type (mixed)
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335
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336 if type == 'number' then f (mixed)
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337
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338 else if type == 'string' then f (string.format ('%q', mixed))
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339
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340 else if type == 'table' then
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341 f ('{')
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342 for k,v in pairs (mixed) do
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343 f ('\n')
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344 f (indents[indent])
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345 f ('[') f (lson_encode (k)) f ('] = ')
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346 lson_encode (v, f, indent+1, indents)
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347 f (',')
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348 end
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349 f (' }')
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350 end end end
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351
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352 if capture then return table.concat (capture) end
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353 end
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354
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355
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356 function timestamp (time) ---------------------------------------- timestamp
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357 return os.date ('%Y%m%d.%H%M%S', time)
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358 end
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359
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360
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361 function values (t) ------------------------------------------------- values
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362 local k, v
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363 return function () k, v = next (t, k) return v end
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364 end
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