prosody
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util/format.lua

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util/format.lua @ 9669:8c3ef65ecb40

spec/keep_full_sub_req: Verify that the presence subscription stays the same after a reconnect
author Kim Alvefur <zash@zash.se>
date Sat, 01 Dec 2018 18:07:56 +0100
parent 9656:3da6cc927ee6
child 9687:8c92ef4270c9
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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
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32 local option = spec:sub(-1);
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33 if arg == nil then
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34 args[i] = "nil";
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35 spec = "<%s>";
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36 elseif option == "q" or option == "s" then -- arg should be string
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37 args[i] = tostring(arg);
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38 elseif type(arg) ~= "number" then -- arg isn't number as expected?
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39 args[i] = tostring(arg);
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40 spec = "[%s]";
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41 end
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42 end
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43 return spec;
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44 end);
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45
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46 -- process extra args
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47 while i < args_length do
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48 i = i + 1;
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49 local arg = args[i];
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50 if arg == nil then
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51 args[i] = "<nil>";
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52 else
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53 args[i] = tostring(arg);
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54 end
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55 formatstring = formatstring .. " [%s]"
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56 end
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57
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58 return formatstring:format(unpack(args));
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59 end
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60
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61 return {
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62 format = format;
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63 };