prosody
22066b02887f
util/serialization.lua

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util/serialization.lua @ 12781:22066b02887f

util.startup: Provide a common Lua 5.3+ math.type() for Lua 5.2 Code deduplication
author Kim Alvefur <zash@zash.se>
date Wed, 19 Oct 2022 16:25:05 +0200
parent 11093:ec14d4fce855
child 12782:8815d3090928
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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 -- Copyright (C) 2018 Kim Alvefur
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5 --
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b1885732e979 GPL->MIT!
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6 -- This project is MIT/X11 licensed. Please see the
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7 -- COPYING file in the source package for more information.
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8 --
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9
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10 local getmetatable = getmetatable;
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11 local next, type = next, type;
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12 local s_format = string.format;
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13 local s_gsub = string.gsub;
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14 local s_rep = string.rep;
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15 local s_char = string.char;
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16 local s_match = string.match;
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17 local t_concat = table.concat;
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18
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19 local to_hex = require "util.hex".to;
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20
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21 local pcall = pcall;
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22 local envload = require"util.envload".envload;
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23
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24 local pos_inf, neg_inf = math.huge, -math.huge;
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25 local m_type = math.type;
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26
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27 local function rawpairs(t)
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28 return next, t, nil;
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29 end
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30
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31 local function fatal_error(obj, why)
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32 error("Can't serialize "..type(obj) .. (why and ": ".. why or ""));
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33 end
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34
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35 local function nonfatal_fallback(x, why)
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36 return s_format("{__type=%q,__error=%q}", type(x), why or "fail");
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37 end
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38
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39 local string_escapes = {
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40 ['\a'] = [[\a]]; ['\b'] = [[\b]];
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41 ['\f'] = [[\f]]; ['\n'] = [[\n]];
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42 ['\r'] = [[\r]]; ['\t'] = [[\t]];
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43 ['\v'] = [[\v]]; ['\\'] = [[\\]];
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44 ['\"'] = [[\"]]; ['\''] = [[\']];
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45 }
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46
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47 for i = 0, 255 do
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48 local c = s_char(i);
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49 if not string_escapes[c] then
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50 string_escapes[c] = s_format("\\%03d", i);
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51 end
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52 end
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53
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54 local default_keywords = {
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55 ["do"] = true; ["and"] = true; ["else"] = true; ["break"] = true;
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56 ["if"] = true; ["end"] = true; ["goto"] = true; ["false"] = true;
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57 ["in"] = true; ["for"] = true; ["then"] = true; ["local"] = true;
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58 ["or"] = true; ["nil"] = true; ["true"] = true; ["until"] = true;
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59 ["elseif"] = true; ["function"] = true; ["not"] = true;
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60 ["repeat"] = true; ["return"] = true; ["while"] = true;
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61 };
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62
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63 local function new(opt)
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64 if type(opt) ~= "table" then
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65 opt = { preset = opt };
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66 end
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67
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68 local types = {
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69 table = true;
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70 string = true;
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71 number = true;
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72 boolean = true;
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73 ["nil"] = true;
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74 };
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75
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76 -- presets
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77 if opt.preset == "debug" then
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78 opt.preset = "oneline";
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79 opt.freeze = true;
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80 opt.fatal = false;
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81 opt.fallback = nonfatal_fallback;
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82 opt.unquoted = true;
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83 end
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84 if opt.preset == "oneline" then
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85 opt.indentwith = opt.indentwith or "";
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86 opt.itemstart = opt.itemstart or " ";
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87 opt.itemlast = opt.itemlast or "";
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88 opt.tend = opt.tend or " }";
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89 elseif opt.preset == "compact" then
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90 opt.indentwith = opt.indentwith or "";
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91 opt.itemstart = opt.itemstart or "";
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92 opt.itemlast = opt.itemlast or "";
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93 opt.equals = opt.equals or "=";
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94 opt.unquoted = true;
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95 end
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96
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97 local fallback = opt.fallback or opt.fatal == false and nonfatal_fallback or fatal_error;
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98
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99 local function ser(v)
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100 return (types[type(v)] or fallback)(v);
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101 end
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102
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103 local keywords = opt.keywords or default_keywords;
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104
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105 -- indented
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106 local indentwith = opt.indentwith or "\t";
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107 local itemstart = opt.itemstart or "\n";
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108 local itemsep = opt.itemsep or ";";
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109 local itemlast = opt.itemlast or ";\n";
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110 local tstart = opt.tstart or "{";
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111 local tend = opt.tend or "}";
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112 local kstart = opt.kstart or "[";
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113 local kend = opt.kend or "]";
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114 local equals = opt.equals or " = ";
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115 local unquoted = opt.unquoted == true and "^[%a_][%w_]*$" or opt.unquoted;
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116 local hex = opt.hex;
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117 local freeze = opt.freeze;
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118 local maxdepth = opt.maxdepth or 127;
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119 local multirefs = opt.multiref;
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120 local table_pairs = opt.table_iterator or rawpairs;
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121
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122 -- serialize one table, recursively
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123 -- t - table being serialized
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124 -- o - array where tokens are added, concatenate to get final result
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125 -- - also used to detect cycles
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126 -- l - position in o of where to insert next token
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127 -- d - depth, used for indentation
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128 local function serialize_table(t, o, l, d)
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129 if o[t] then
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130 o[l], l = fallback(t, "table has multiple references"), l + 1;
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131 return l;
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132 elseif d > maxdepth then
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133 o[l], l = fallback(t, "max table depth reached"), l + 1;
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134 return l;
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135 end
546
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parents:
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136
9567
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137 -- Keep track of table loops
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138 local ot = t; -- reference pre-freeze
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139 o[t] = true;
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140 o[ot] = true;
9485
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parents: 9484
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141
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142 if freeze == true then
9008
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143 -- opportunity to do pre-serialization
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Kim Alvefur <zash@zash.se>
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144 local mt = getmetatable(t);
9485
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parents: 9484
diff changeset
145 if type(mt) == "table" then
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parents: 9484
diff changeset
146 local tag = mt.__name;
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Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
147 local fr = mt.__freeze;
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parents: 9484
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148
c667887d78ad util.serialization: Simpler metatable pre-processing
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parents: 9484
diff changeset
149 if type(fr) == "function" then
c667887d78ad util.serialization: Simpler metatable pre-processing
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parents: 9484
diff changeset
150 t = fr(t);
11093
ec14d4fce855 util.serialization: Let freeze metamethod return a literal string
Kim Alvefur <zash@zash.se>
parents: 10061
diff changeset
151 if type(t) == "string" then
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parents: 10061
diff changeset
152 o[l], l = t, l + 1;
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Kim Alvefur <zash@zash.se>
parents: 10061
diff changeset
153 return l;
ec14d4fce855 util.serialization: Let freeze metamethod return a literal string
Kim Alvefur <zash@zash.se>
parents: 10061
diff changeset
154 end
9485
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
155 if type(tag) == "string" then
c667887d78ad util.serialization: Simpler metatable pre-processing
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parents: 9484
diff changeset
156 o[l], l = tag, l + 1;
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Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
157 end
9008
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parents: 8555
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158 end
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parents: 8555
diff changeset
159 end
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Kim Alvefur <zash@zash.se>
parents: 8555
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160 end
9485
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parents: 9484
diff changeset
161
9008
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162 o[l], l = tstart, l + 1;
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Kim Alvefur <zash@zash.se>
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163 local indent = s_rep(indentwith, d);
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Kim Alvefur <zash@zash.se>
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164 local numkey = 1;
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165 local ktyp, vtyp;
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166 local had_items = false;
9864
9d80e679c371 util.serialization: Allow overriding table iterator
Kim Alvefur <zash@zash.se>
parents: 9863
diff changeset
167 for k,v in table_pairs(t) do
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168 had_items = true;
9008
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169 o[l], l = itemstart, l + 1;
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parents: 8555
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170 o[l], l = indent, l + 1;
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parents: 8555
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171 ktyp, vtyp = type(k), type(v);
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parents: 8555
diff changeset
172 if k == numkey then
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Kim Alvefur <zash@zash.se>
parents: 8555
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173 -- next index in array part
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
174 -- assuming that these are found in order
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parents: 8555
diff changeset
175 numkey = numkey + 1;
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
176 elseif unquoted and ktyp == "string" and
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
177 not keywords[k] and s_match(k, unquoted) then
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parents: 8555
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178 -- unquoted keys
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parents: 8555
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179 o[l], l = k, l + 1;
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parents: 8555
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180 o[l], l = equals, l + 1;
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parents: 8555
diff changeset
181 else
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
182 -- quoted keys
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
183 o[l], l = kstart, l + 1;
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parents: 8555
diff changeset
184 if ktyp == "table" then
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parents: 8555
diff changeset
185 l = serialize_table(k, o, l, d+1);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
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parents: 8555
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186 else
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parents: 8555
diff changeset
187 o[l], l = ser(k), l + 1;
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Kim Alvefur <zash@zash.se>
parents: 8555
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188 end
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parents: 8555
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189 -- =
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parents: 8555
diff changeset
190 o[l], o[l+1], l = kend, equals, l + 2;
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
191 end
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
192
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parents: 8555
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193 -- the value
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
194 if vtyp == "table" then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
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parents: 8555
diff changeset
195 l = serialize_table(v, o, l, d+1);
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parents: 8555
diff changeset
196 else
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parents: 8555
diff changeset
197 o[l], l = ser(v), l + 1;
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parents: 8555
diff changeset
198 end
9863
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diff changeset
199 o[l], l = itemsep, l + 1;
9008
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parents: 8555
diff changeset
200 end
9863
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Kim Alvefur <zash@zash.se>
parents: 9692
diff changeset
201 if had_items then
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Kim Alvefur <zash@zash.se>
parents: 9692
diff changeset
202 o[l - 1] = itemlast;
9008
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parents: 8555
diff changeset
203 o[l], l = s_rep(indentwith, d-1), l + 1;
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
204 end
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
205 o[l], l = tend, l +1;
9567
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parents: 9565
diff changeset
206
dbfa286cfa88 util.serialization: Add option for allowing multiple references to the same table (but not cycles)
Kim Alvefur <zash@zash.se>
parents: 9565
diff changeset
207 if multirefs then
dbfa286cfa88 util.serialization: Add option for allowing multiple references to the same table (but not cycles)
Kim Alvefur <zash@zash.se>
parents: 9565
diff changeset
208 o[t] = nil;
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Kim Alvefur <zash@zash.se>
parents: 9565
diff changeset
209 o[ot] = nil;
dbfa286cfa88 util.serialization: Add option for allowing multiple references to the same table (but not cycles)
Kim Alvefur <zash@zash.se>
parents: 9565
diff changeset
210 end
dbfa286cfa88 util.serialization: Add option for allowing multiple references to the same table (but not cycles)
Kim Alvefur <zash@zash.se>
parents: 9565
diff changeset
211
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
212 return l;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
213 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
214
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
215 function types.table(t)
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
216 local o = {};
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
217 serialize_table(t, o, 1, 1);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
218 return t_concat(o);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
219 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
220
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
221 local function serialize_string(s)
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
222 return '"' .. s_gsub(s, "[%z\1-\31\"\'\\\127-\255]", string_escapes) .. '"';
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
223 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
224
9483
903e0cfd4cc9 util.serialization: Make check of prefix for optional hex encoding stricter
Kim Alvefur <zash@zash.se>
parents: 9480
diff changeset
225 if type(hex) == "string" then
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
226 function types.string(s)
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
227 local esc = serialize_string(s);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
228 if #esc > (#s*2+2+#hex) then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
229 return hex .. '"' .. to_hex(s) .. '"';
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
230 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
231 return esc;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
232 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
233 else
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
234 types.string = serialize_string;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
235 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
236
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
237 function types.number(t)
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
238 if m_type(t) == "integer" then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
239 return s_format("%d", t);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
240 elseif t == pos_inf then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
241 return "(1/0)";
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
242 elseif t == neg_inf then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
243 return "(-1/0)";
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
244 elseif t ~= t then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
245 return "(0/0)";
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
246 end
9486
20aad0108999 util.serialization: Remove encoding of very large or very small numbers in scientific notation
Kim Alvefur <zash@zash.se>
parents: 9485
diff changeset
247 return s_format("%.18g", t);
9008
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
248 end
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
249
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
250 -- Are these faster than tostring?
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
251 types["nil"] = function()
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
252 return "nil";
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
253 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
254
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
255 function types.boolean(t)
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
256 return t and "true" or "false";
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
257 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
258
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
259 return ser;
546
1e65f64dfabf Added module util.serialization
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
260 end
1e65f64dfabf Added module util.serialization
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
261
6777
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6670
diff changeset
262 local function deserialize(str)
3736
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
263 if type(str) ~= "string" then return nil; end
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
264 str = "return "..str;
9484
1d1541630c20 util.serialization: Use '=' prefix for chunk source description
Kim Alvefur <zash@zash.se>
parents: 9483
diff changeset
265 local f, err = envload(str, "=serialized data", {});
3736
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
266 if not f then return nil, err; end
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
267 local success, ret = pcall(f);
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
268 if not success then return nil, ret; end
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
269 return ret;
546
1e65f64dfabf Added module util.serialization
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
270 end
1e65f64dfabf Added module util.serialization
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
271
10060
7a36b7ac309b util.serialization: Cache default serialization instance (fixes #1389)
Kim Alvefur <zash@zash.se>
parents: 9570
diff changeset
272 local default = new();
6777
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6670
diff changeset
273 return {
9008
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Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
274 new = new;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
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275 serialize = function (x, opt)
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276 if opt == nil then
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277 return default(x);
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278 else
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279 return new(opt)(x);
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280 end
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281 end;
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282 deserialize = deserialize;
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283 };