prosody
f81cd9aaf994
util/format.lua

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util/format.lua @ 8237:f81cd9aaf994

util.async: Fix documentation URL
author Waqas Hussain <waqas20@gmail.com>
date Fri, 15 Sep 2017 17:17:07 -0400
parent 8225:70cb72f46a3b
child 8382:e5d00bf4a4d5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
8225
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 assert = assert;
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8 local unpack = unpack;
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9 local type = type;
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10
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11 local function format(format, ...)
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12 local args, args_length = { ... }, select('#', ...);
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13
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14 -- format specifier spec:
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15 -- 1. Start: '%%'
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16 -- 2. Flags: '[%-%+ #0]'
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17 -- 3. Width: '%d?%d?'
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18 -- 4. Precision: '%.?%d?%d?'
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19 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
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20 --
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21 -- 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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22 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
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23 -- a and A are only in Lua 5.2+
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24
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25
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26 -- process each format specifier
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27 local i = 0;
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28 format = format:gsub("%%[^cdiouxXaAeEfgGqs%%]*[cdiouxXaAeEfgGqs%%]", function(spec)
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29 if spec ~= "%%" then
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30 i = i + 1;
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31 local arg = args[i];
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32 if arg == nil then -- special handling for nil
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33 arg = "<nil>"
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34 args[i] = "<nil>";
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35 end
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36
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37 local option = spec:sub(-1);
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38 if option == "q" or option == "s" then -- arg should be string
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39 args[i] = tostring(arg);
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40 elseif type(arg) ~= "number" then -- arg isn't number as expected?
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41 args[i] = tostring(arg);
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42 spec = "[%s]";
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43 end
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44 end
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45 return spec;
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46 end);
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47
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48 -- process extra args
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49 while i < args_length do
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50 i = i + 1;
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51 local arg = args[i];
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52 if arg == nil then
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53 args[i] = "<nil>";
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54 else
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55 args[i] = tostring(arg);
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56 end
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57 format = format .. " [%s]"
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58 end
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59
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60 return format:format(unpack(args));
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61 end
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62
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63 local function test()
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64 assert(format("%s", "hello") == "hello");
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65 assert(format("%s") == "<nil>");
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66 assert(format("%s", true) == "true");
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67 assert(format("%d", true) == "[true]");
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68 assert(format("%%", true) == "% [true]");
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69 end
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70
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71 return {
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72 format = format;
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73 test = test;
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74 };