prosody
1c410b4f3a58
util/serialization.lua

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util/serialization.lua @ 7696:1c410b4f3a58

util.pubsub: Factor item storage cache into a per service configurable option
author Kim Alvefur <zash@zash.se>
date Sun, 16 Oct 2016 00:36:05 +0200
parent 6777:5de6b93d0190
child 8555:4f0f5b49bb03
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local string_rep = string.rep;
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10 local type = type;
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11 local tostring = tostring;
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12 local t_insert = table.insert;
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13 local t_concat = table.concat;
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14 local pairs = pairs;
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15 local next = next;
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16
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17 local pcall = pcall;
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18
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19 local debug_traceback = debug.traceback;
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20 local log = require "util.logger".init("serialization");
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21 local envload = require"util.envload".envload;
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22
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23 local _ENV = nil;
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24
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25 local indent = function(i)
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26 return string_rep("\t", i);
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27 end
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28 local function basicSerialize (o)
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29 if type(o) == "number" or type(o) == "boolean" then
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30 -- no need to check for NaN, as that's not a valid table index
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31 if o == 1/0 then return "(1/0)";
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32 elseif o == -1/0 then return "(-1/0)";
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33 else return tostring(o); end
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34 else -- assume it is a string -- FIXME make sure it's a string. throw an error otherwise.
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35 return (("%q"):format(tostring(o)):gsub("\\\n", "\\n"));
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36 end
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37 end
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38 local function _simplesave(o, ind, t, func)
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39 if type(o) == "number" then
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40 if o ~= o then func(t, "(0/0)");
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41 elseif o == 1/0 then func(t, "(1/0)");
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42 elseif o == -1/0 then func(t, "(-1/0)");
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43 else func(t, tostring(o)); end
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44 elseif type(o) == "string" then
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45 func(t, (("%q"):format(o):gsub("\\\n", "\\n")));
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46 elseif type(o) == "table" then
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47 if next(o) ~= nil then
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48 func(t, "{\n");
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49 for k,v in pairs(o) do
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50 func(t, indent(ind));
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51 func(t, "[");
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52 func(t, basicSerialize(k));
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53 func(t, "] = ");
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54 if ind == 0 then
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55 _simplesave(v, 0, t, func);
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56 else
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57 _simplesave(v, ind+1, t, func);
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58 end
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59 func(t, ";\n");
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60 end
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61 func(t, indent(ind-1));
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62 func(t, "}");
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63 else
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64 func(t, "{}");
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65 end
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66 elseif type(o) == "boolean" then
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67 func(t, (o and "true" or "false"));
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68 else
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69 log("error", "cannot serialize a %s: %s", type(o), debug_traceback())
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70 func(t, "nil");
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71 end
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72 end
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73
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74 local function append(t, o)
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75 _simplesave(o, 1, t, t.write or t_insert);
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76 return t;
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77 end
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78
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79 local function serialize(o)
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80 return t_concat(append({}, o));
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81 end
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82
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83 local function deserialize(str)
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84 if type(str) ~= "string" then return nil; end
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85 str = "return "..str;
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86 local f, err = envload(str, "@data", {});
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87 if not f then return nil, err; end
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88 local success, ret = pcall(f);
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89 if not success then return nil, ret; end
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90 return ret;
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91 end
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92
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93 return {
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94 append = append;
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95 serialize = serialize;
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96 deserialize = deserialize;
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97 };