prosody
f2258e9750cf
util/format.lua

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util/format.lua @ 9273:f2258e9750cf

mod_vcard_legacy: Include avatar data even if metadata can't be loaded Normally both nodes should have the same configuration and matching items, but we can't depend on it without having some code that enforces it, which does not exist at the time of this commit. Including the avatar itself should be prioritised. The image format can be derived from magic bytes.
author Kim Alvefur <zash@zash.se>
date Fri, 07 Sep 2018 01:08:27 +0200
parent 8417:e88db5668cfb
child 9656:3da6cc927ee6
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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 select = select;
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7 local unpack = table.unpack or unpack; -- luacheck: ignore 113/unpack
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8 local type = type;
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9
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10 local function format(formatstring, ...)
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11 local args, args_length = { ... }, select('#', ...);
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12
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13 -- format specifier spec:
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14 -- 1. Start: '%%'
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15 -- 2. Flags: '[%-%+ #0]'
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16 -- 3. Width: '%d?%d?'
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17 -- 4. Precision: '%.?%d?%d?'
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18 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
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19 --
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20 -- 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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21 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
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22 -- a and A are only in Lua 5.2+
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23
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24
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25 -- process each format specifier
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26 local i = 0;
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27 formatstring = formatstring:gsub("%%[^cdiouxXaAeEfgGqs%%]*[cdiouxXaAeEfgGqs%%]", function(spec)
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28 if spec ~= "%%" then
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29 i = i + 1;
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30 local arg = args[i];
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31 if arg == nil then -- special handling for nil
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32 arg = "<nil>"
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33 args[i] = "<nil>";
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34 end
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35
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36 local option = spec:sub(-1);
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37 if option == "q" or option == "s" then -- arg should be string
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38 args[i] = tostring(arg);
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39 elseif type(arg) ~= "number" then -- arg isn't number as expected?
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40 args[i] = tostring(arg);
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41 spec = "[%s]";
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42 end
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43 end
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44 return spec;
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45 end);
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46
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47 -- process extra args
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48 while i < args_length do
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49 i = i + 1;
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50 local arg = args[i];
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51 if arg == nil then
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52 args[i] = "<nil>";
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53 else
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54 args[i] = tostring(arg);
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55 end
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56 formatstring = formatstring .. " [%s]"
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57 end
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58
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59 return formatstring:format(unpack(args));
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60 end
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61
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62 return {
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63 format = format;
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64 };