prosody
39ee70fbb009
util/format.lua

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util/format.lua @ 9751:39ee70fbb009

mod_mam: Perform message expiry based on building an index by date For each day, store a set of users that have new messages. To expire messages, we collect the union of sets of users from dates that fall outside the cleanup range. The previous algoritm did not work well with many users, especially with the default settings.
author Kim Alvefur <zash@zash.se>
date Thu, 03 Jan 2019 17:25:43 +0100
parent 9693:6ed0d6224d64
child 10034:4fca92d60040
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70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
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1 --
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2 -- A string.format wrapper that gracefully handles invalid arguments
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3 --
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4
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5 local tostring = tostring;
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6 local unpack = table.unpack or unpack; -- luacheck: ignore 113/unpack
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7 local pack = require "util.table".pack; -- TODO table.pack in 5.2+
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8 local type = type;
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9 local dump = require "util.serialization".new("debug");
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10
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11 local function format(formatstring, ...)
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12 local args = pack(...);
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13 local args_length = args.n;
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14
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15 -- format specifier spec:
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16 -- 1. Start: '%%'
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17 -- 2. Flags: '[%-%+ #0]'
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18 -- 3. Width: '%d?%d?'
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19 -- 4. Precision: '%.?%d?%d?'
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20 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
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21 --
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22 -- The options c, d, E, e, f, g, G, i, o, u, X, and x all expect a number as argument, whereas q and s expect a string.
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23 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
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24 -- a and A are only in Lua 5.2+
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26
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27 -- process each format specifier
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28 local i = 0;
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29 formatstring = formatstring:gsub("%%[^cdiouxXaAeEfgGqs%%]*[cdiouxXaAeEfgGqs%%]", function(spec)
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30 if spec ~= "%%" then
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31 i = i + 1;
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32 local arg = args[i];
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33
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34 local option = spec:sub(-1);
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35 if arg == nil then
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36 args[i] = "nil";
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37 spec = "<%s>";
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38 elseif option == "q" then
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39 args[i] = dump(arg);
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40 spec = "%s";
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41 elseif option == "s" then
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42 args[i] = tostring(arg);
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43 elseif type(arg) ~= "number" then -- arg isn't number as expected?
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44 args[i] = tostring(arg);
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45 spec = "[%s]";
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46 end
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47 end
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48 return spec;
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49 end);
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50
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51 -- process extra args
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52 while i < args_length do
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53 i = i + 1;
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54 local arg = args[i];
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55 if arg == nil then
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56 args[i] = "<nil>";
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57 else
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58 args[i] = tostring(arg);
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59 end
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60 formatstring = formatstring .. " [%s]"
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61 end
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62
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63 return formatstring:format(unpack(args));
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64 end
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65
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66 return {
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67 format = format;
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68 };