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annotate util/format.lua @ 9659:86c431650dfd

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net.websocket.frames: Prefer Lua 5.2 built-in bit module over LuaJIT version When running on Lua 5.2 this makes sense since bit32 is usually already loaded. It's sensible to prefer this going forward in case of incompatibilities between the two variants.
author Kim Alvefur <zash@zash.se>
date Thu, 29 Nov 2018 16:53:22 +0100
parents 3da6cc927ee6
children 8c92ef4270c9
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70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
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1 --
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
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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 --
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
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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.
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
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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 };