prosody
8649a6b010e2
util/format.lua

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util/format.lua @ 9710:8649a6b010e2

Merge 0.11->trunk
author Kim Alvefur <zash@zash.se>
date Mon, 17 Dec 2018 15:42:54 +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 };