prosody
c667887d78ad
util/format.lua

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util/format.lua @ 9485:c667887d78ad

util.serialization: Simpler metatable pre-processing It was too difficult to describe what it did.
author Kim Alvefur <zash@zash.se>
date Fri, 12 Oct 2018 00:13:24 +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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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 };