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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 | -- |
758 | 5 | -- This project is MIT/X11 licensed. Please see the |
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 error = error; |
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15 | local pairs = pairs; |
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16 | local next = next; |
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17 | |
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18 | local loadstring = loadstring; |
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19 | local setfenv = setfenv; |
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20 | local pcall = pcall; |
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21 | |
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22 | local debug_traceback = debug.traceback; |
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23 | local log = require "util.logger".init("serialization"); |
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24 | module "serialization" |
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25 | |
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26 | local indent = function(i) |
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27 | return string_rep("\t", i); |
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28 | end |
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29 | local function basicSerialize (o) |
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30 | if type(o) == "number" or type(o) == "boolean" then |
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31 | -- no need to check for NaN, as that's not a valid table index |
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32 | if o == 1/0 then return "(1/0)"; |
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33 | elseif o == -1/0 then return "(-1/0)"; |
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34 | else return tostring(o); end |
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35 | else -- assume it is a string -- FIXME make sure it's a string. throw an error otherwise. |
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36 | return (("%q"):format(tostring(o)):gsub("\\\n", "\\n")); |
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37 | end |
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38 | end |
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39 | local function _simplesave(o, ind, t, func) |
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40 | if type(o) == "number" then |
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41 | if o ~= o then func(t, "(0/0)"); |
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42 | elseif o == 1/0 then func(t, "(1/0)"); |
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43 | elseif o == -1/0 then func(t, "(-1/0)"); |
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44 | else func(t, tostring(o)); end |
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45 | elseif type(o) == "string" then |
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46 | func(t, (("%q"):format(o):gsub("\\\n", "\\n"))); |
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47 | elseif type(o) == "table" then |
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48 | if next(o) ~= nil then |
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49 | func(t, "{\n"); |
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50 | for k,v in pairs(o) do |
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51 | func(t, indent(ind)); |
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52 | func(t, "["); |
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53 | func(t, basicSerialize(k)); |
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54 | func(t, "] = "); |
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55 | if ind == 0 then |
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56 | _simplesave(v, 0, t, func); |
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57 | else |
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58 | _simplesave(v, ind+1, t, func); |
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59 | end |
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60 | func(t, ";\n"); |
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61 | end |
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62 | func(t, indent(ind-1)); |
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63 | func(t, "}"); |
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64 | else |
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65 | func(t, "{}"); |
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66 | end |
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67 | elseif type(o) == "boolean" then |
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68 | func(t, (o and "true" or "false")); |
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69 | else |
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70 | log("error", "cannot serialize a %s: %s", type(o), debug_traceback()) |
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71 | func(t, "nil"); |
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72 | end |
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73 | end |
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74 | |
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75 | function append(t, o) |
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76 | _simplesave(o, 1, t, t.write or t_insert); |
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77 | return t; |
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78 | end |
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79 | |
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80 | function serialize(o) |
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81 | return t_concat(append({}, o)); |
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82 | end |
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83 | |
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84 | function deserialize(str) |
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85 | if type(str) ~= "string" then return nil; end |
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86 | str = "return "..str; |
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87 | local f, err = loadstring(str, "@data"); |
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88 | if not f then return nil, err; end |
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89 | setfenv(f, {}); |
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90 | local success, ret = pcall(f); |
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91 | if not success then return nil, ret; end |
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92 | return ret; |
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93 | end |
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94 | |
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95 | return _M; |