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97 lines
2.4 KiB
97 lines
2.4 KiB
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local string_rep = string.rep;
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local type = type;
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local tostring = tostring;
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local t_insert = table.insert;
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local t_concat = table.concat;
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local pairs = pairs;
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local next = next;
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local pcall = pcall;
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local debug_traceback = debug.traceback;
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local log = require "util.logger".init("serialization");
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local envload = require"util.envload".envload;
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local _ENV = nil;
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local indent = function(i)
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return string_rep("\t", i);
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end
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local function basicSerialize (o)
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if type(o) == "number" or type(o) == "boolean" then
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-- no need to check for NaN, as that's not a valid table index
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if o == 1/0 then return "(1/0)";
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elseif o == -1/0 then return "(-1/0)";
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else return tostring(o); end
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else -- assume it is a string -- FIXME make sure it's a string. throw an error otherwise.
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return (("%q"):format(tostring(o)):gsub("\\\n", "\\n"));
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end
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end
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local function _simplesave(o, ind, t, func)
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if type(o) == "number" then
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if o ~= o then func(t, "(0/0)");
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elseif o == 1/0 then func(t, "(1/0)");
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elseif o == -1/0 then func(t, "(-1/0)");
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else func(t, tostring(o)); end
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elseif type(o) == "string" then
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func(t, (("%q"):format(o):gsub("\\\n", "\\n")));
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elseif type(o) == "table" then
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if next(o) ~= nil then
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func(t, "{\n");
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for k,v in pairs(o) do
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func(t, indent(ind));
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func(t, "[");
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func(t, basicSerialize(k));
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func(t, "] = ");
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if ind == 0 then
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_simplesave(v, 0, t, func);
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else
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_simplesave(v, ind+1, t, func);
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end
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func(t, ";\n");
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end
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func(t, indent(ind-1));
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func(t, "}");
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else
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func(t, "{}");
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end
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elseif type(o) == "boolean" then
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func(t, (o and "true" or "false"));
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else
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log("error", "cannot serialize a %s: %s", type(o), debug_traceback())
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func(t, "nil");
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end
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end
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local function append(t, o)
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_simplesave(o, 1, t, t.write or t_insert);
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return t;
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end
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local function serialize(o)
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return t_concat(append({}, o));
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end
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local function deserialize(str)
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if type(str) ~= "string" then return nil; end
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str = "return "..str;
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local f, err = envload(str, "@data", {});
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if not f then return nil, err; end
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local success, ret = pcall(f);
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if not success then return nil, ret; end
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return ret;
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end
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return {
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append = append;
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serialize = serialize;
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deserialize = deserialize;
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};
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