prosody
9e2ee40b4a0a
util/serialization.lua

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util/serialization.lua @ 9689:9e2ee40b4a0a

luacheckrc: Set Lua standard to 5.3 with 5.2 compat enabled
author Kim Alvefur <zash@zash.se>
date Sat, 08 Dec 2018 17:00:30 +0100
parent 9570:ce403b6470f8
child 9692:affcbccc1dff
child 10060:7a36b7ac309b
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rev   line source
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Matthew Wild <mwild1@gmail.com>
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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 pcall = pcall;
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20 local envload = require"util.envload".envload;
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21
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22 local pos_inf, neg_inf = math.huge, -math.huge;
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23 -- luacheck: ignore 143/math
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24 local m_type = math.type or function (n)
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25 return n % 1 == 0 and n <= 9007199254740992 and n >= -9007199254740992 and "integer" or "float";
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26 end;
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27
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28 local char_to_hex = {};
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29 for i = 0,255 do
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30 char_to_hex[s_char(i)] = s_format("%02x", i);
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31 end
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32
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33 local function to_hex(s)
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34 return (s_gsub(s, ".", char_to_hex));
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35 end
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36
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37 local function fatal_error(obj, why)
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38 error("Can't serialize "..type(obj) .. (why and ": ".. why or ""));
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39 end
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40
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41 local function nonfatal_fallback(x, why)
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42 return s_format("{__type=%q,__error=%q}", type(x), why or "fail");
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43 end
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44
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45 local string_escapes = {
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46 ['\a'] = [[\a]]; ['\b'] = [[\b]];
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47 ['\f'] = [[\f]]; ['\n'] = [[\n]];
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48 ['\r'] = [[\r]]; ['\t'] = [[\t]];
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49 ['\v'] = [[\v]]; ['\\'] = [[\\]];
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50 ['\"'] = [[\"]]; ['\''] = [[\']];
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51 }
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52
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53 for i = 0, 255 do
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54 local c = s_char(i);
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55 if not string_escapes[c] then
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56 string_escapes[c] = s_format("\\%03d", i);
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57 end
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58 end
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59
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60 local default_keywords = {
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61 ["do"] = true; ["and"] = true; ["else"] = true; ["break"] = true;
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62 ["if"] = true; ["end"] = true; ["goto"] = true; ["false"] = true;
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63 ["in"] = true; ["for"] = true; ["then"] = true; ["local"] = true;
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64 ["or"] = true; ["nil"] = true; ["true"] = true; ["until"] = true;
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65 ["elseif"] = true; ["function"] = true; ["not"] = true;
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66 ["repeat"] = true; ["return"] = true; ["while"] = true;
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67 };
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68
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69 local function new(opt)
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70 if type(opt) ~= "table" then
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71 opt = { preset = opt };
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72 end
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73
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74 local types = {
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75 table = true;
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76 string = true;
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77 number = true;
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78 boolean = true;
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79 ["nil"] = true;
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80 };
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81
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82 -- presets
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83 if opt.preset == "debug" then
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84 opt.preset = "oneline";
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85 opt.freeze = true;
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86 opt.fatal = false;
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87 opt.fallback = nonfatal_fallback;
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88 opt.unquoted = true;
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89 end
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90 if opt.preset == "oneline" then
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91 opt.indentwith = opt.indentwith or "";
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92 opt.itemstart = opt.itemstart or " ";
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93 opt.itemlast = opt.itemlast or "";
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94 opt.tend = opt.tend or " }";
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95 elseif opt.preset == "compact" then
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96 opt.indentwith = opt.indentwith or "";
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97 opt.itemstart = opt.itemstart or "";
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98 opt.itemlast = opt.itemlast or "";
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99 opt.equals = opt.equals or "=";
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100 opt.unquoted = true;
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101 end
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102
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103 local fallback = opt.fallback or opt.fatal == false and nonfatal_fallback or fatal_error;
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104
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105 local function ser(v)
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106 return (types[type(v)] or fallback)(v);
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107 end
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108
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109 local keywords = opt.keywords or default_keywords;
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110
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111 -- indented
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112 local indentwith = opt.indentwith or "\t";
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113 local itemstart = opt.itemstart or "\n";
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114 local itemsep = opt.itemsep or ";";
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115 local itemlast = opt.itemlast or ";\n";
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116 local tstart = opt.tstart or "{";
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117 local tend = opt.tend or "}";
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118 local kstart = opt.kstart or "[";
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119 local kend = opt.kend or "]";
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120 local equals = opt.equals or " = ";
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121 local unquoted = opt.unquoted == true and "^[%a_][%w_]*$" or opt.unquoted;
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122 local hex = opt.hex;
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123 local freeze = opt.freeze;
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124 local maxdepth = opt.maxdepth or 127;
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125 local multirefs = opt.multiref;
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126
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127 -- serialize one table, recursively
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128 -- t - table being serialized
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129 -- o - array where tokens are added, concatenate to get final result
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130 -- - also used to detect cycles
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131 -- l - position in o of where to insert next token
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132 -- d - depth, used for indentation
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133 local function serialize_table(t, o, l, d)
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134 if o[t] then
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Kim Alvefur <zash@zash.se>
parents: 9564
diff changeset
135 o[l], l = fallback(t, "table has multiple references"), l + 1;
9a1e2f5f674f util.serialization: Separate errors for multiple table references and max depth
Kim Alvefur <zash@zash.se>
parents: 9564
diff changeset
136 return l;
9a1e2f5f674f util.serialization: Separate errors for multiple table references and max depth
Kim Alvefur <zash@zash.se>
parents: 9564
diff changeset
137 elseif d > maxdepth then
9a1e2f5f674f util.serialization: Separate errors for multiple table references and max depth
Kim Alvefur <zash@zash.se>
parents: 9564
diff changeset
138 o[l], l = fallback(t, "max table depth reached"), l + 1;
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
139 return l;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
140 end
546
1e65f64dfabf Added module util.serialization
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
141
9567
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
142 -- Keep track of table loops
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
143 local ot = t; -- reference pre-freeze
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
144 o[t] = true;
9567
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
145 o[ot] = true;
9485
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
146
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
147 if freeze == true then
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
148 -- opportunity to do pre-serialization
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
149 local mt = getmetatable(t);
9485
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
150 if type(mt) == "table" then
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
151 local tag = mt.__name;
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
152 local fr = mt.__freeze;
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
153
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
154 if type(fr) == "function" then
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
155 t = fr(t);
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
156 if type(tag) == "string" then
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
157 o[l], l = tag, l + 1;
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
158 end
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
159 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
160 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
161 end
9485
c667887d78ad util.serialization: Simpler metatable pre-processing
Kim Alvefur <zash@zash.se>
parents: 9484
diff changeset
162
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
163 o[l], l = tstart, l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
164 local indent = s_rep(indentwith, d);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
165 local numkey = 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
166 local ktyp, vtyp;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
167 for k,v in next,t do
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
168 o[l], l = itemstart, l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
169 o[l], l = indent, l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
170 ktyp, vtyp = type(k), type(v);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
171 if k == numkey then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
172 -- next index in array part
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
173 -- assuming that these are found in order
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
174 numkey = numkey + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
175 elseif unquoted and ktyp == "string" and
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
176 not keywords[k] and s_match(k, unquoted) then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
177 -- unquoted keys
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
178 o[l], l = k, l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
179 o[l], l = equals, l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
180 else
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
181 -- quoted keys
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
182 o[l], l = kstart, l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
183 if ktyp == "table" then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
184 l = serialize_table(k, o, l, d+1);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
185 else
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
186 o[l], l = ser(k), l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
187 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
188 -- =
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
189 o[l], o[l+1], l = kend, equals, l + 2;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
190 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
191
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
192 -- the value
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
193 if vtyp == "table" then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
194 l = serialize_table(v, o, l, d+1);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
195 else
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
196 o[l], l = ser(v), l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
197 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
198 -- last item?
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
199 if next(t, k) ~= nil then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
200 o[l], l = itemsep, l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
201 else
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
202 o[l], l = itemlast, l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
203 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
204 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
205 if next(t) ~= nil then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
206 o[l], l = s_rep(indentwith, d-1), l + 1;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
207 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
208 o[l], l = tend, l +1;
9567
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
209
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 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
211 o[t] = 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
212 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
213 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
214
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
215 return l;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
216 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
217
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
218 function types.table(t)
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
219 local o = {};
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
220 serialize_table(t, o, 1, 1);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
221 return t_concat(o);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
222 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
223
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
224 local function serialize_string(s)
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
225 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
226 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
227
9483
903e0cfd4cc9 util.serialization: Make check of prefix for optional hex encoding stricter
Kim Alvefur <zash@zash.se>
parents: 9480
diff changeset
228 if type(hex) == "string" then
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
229 function types.string(s)
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
230 local esc = serialize_string(s);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
231 if #esc > (#s*2+2+#hex) then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
232 return hex .. '"' .. to_hex(s) .. '"';
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
233 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
234 return esc;
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 else
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
237 types.string = serialize_string;
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
238 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
239
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
240 function types.number(t)
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
241 if m_type(t) == "integer" then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
242 return s_format("%d", t);
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
243 elseif t == pos_inf then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
244 return "(1/0)";
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
245 elseif t == neg_inf then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
246 return "(-1/0)";
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
247 elseif t ~= t then
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
248 return "(0/0)";
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
249 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
250 return s_format("%.18g", t);
9008
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
251 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
252
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
253 -- Are these faster than tostring?
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
254 types["nil"] = function()
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
255 return "nil";
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
256 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
257
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
258 function types.boolean(t)
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
259 return t and "true" or "false";
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
260 end
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
261
ae3c52419ec1 util.serialization: Rewritte for performance and flexibility
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
262 return ser;
546
1e65f64dfabf Added module util.serialization
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
263 end
1e65f64dfabf Added module util.serialization
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
264
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
265 local function deserialize(str)
3736
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
266 if type(str) ~= "string" then return nil; end
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
267 str = "return "..str;
9484
1d1541630c20 util.serialization: Use '=' prefix for chunk source description
Kim Alvefur <zash@zash.se>
parents: 9483
diff changeset
268 local f, err = envload(str, "=serialized data", {});
3736
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
269 if not f then return nil, err; end
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
270 local success, ret = pcall(f);
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
271 if not success then return nil, ret; end
73399dd525e8 util.serialization: Implemented deserialize().
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
272 return ret;
546
1e65f64dfabf Added module util.serialization
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
273 end
1e65f64dfabf Added module util.serialization
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
274
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
275 return {
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276 new = new;
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277 serialize = function (x, opt)
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278 return new(opt)(x);
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279 end;
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280 deserialize = deserialize;
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281 };