prosody
604096ce2f82
util/format.lua

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util/format.lua @ 10413:604096ce2f82

util.interpolation: Add commented test case for passing nil to filter
author Kim Alvefur <zash@zash.se>
date Sun, 17 Nov 2019 15:32:28 +0100
parent 10035:386f085820e6
child 11638:5f4a657136bc
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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 local num_type = math.type or function (n)
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11 return n % 1 == 0 and n <= 9007199254740992 and n >= -9007199254740992 and "integer" or "float";
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12 end
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13
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14 -- In Lua 5.3+ these formats throw an error if given a float
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15 local expects_integer = { c = true, d = true, i = true, o = true, u = true, X = true, x = true, };
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16
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17 local function format(formatstring, ...)
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18 local args = pack(...);
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19 local args_length = args.n;
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20
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
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21 -- format specifier spec:
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22 -- 1. Start: '%%'
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23 -- 2. Flags: '[%-%+ #0]'
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24 -- 3. Width: '%d?%d?'
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25 -- 4. Precision: '%.?%d?%d?'
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26 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
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27 --
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28 -- 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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29 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
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30 -- a and A are only in Lua 5.2+
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32
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33 -- process each format specifier
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34 local i = 0;
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35 formatstring = formatstring:gsub("%%[^cdiouxXaAeEfgGqs%%]*[cdiouxXaAeEfgGqs%%]", function(spec)
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36 if spec ~= "%%" then
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37 i = i + 1;
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38 local arg = args[i];
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39
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40 local option = spec:sub(-1);
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41 if arg == nil then
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42 args[i] = "nil";
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43 spec = "<%s>";
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44 elseif option == "q" then
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45 args[i] = dump(arg);
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46 spec = "%s";
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47 elseif option == "s" then
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48 args[i] = tostring(arg);
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49 elseif type(arg) ~= "number" then -- arg isn't number as expected?
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50 args[i] = tostring(arg);
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51 spec = "[%s]";
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52 elseif expects_integer[option] and num_type(arg) ~= "integer" then
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53 args[i] = tostring(arg);
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54 spec = "[%s]";
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55 end
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56 end
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57 return spec;
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58 end);
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59
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60 -- process extra args
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61 while i < args_length do
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62 i = i + 1;
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63 local arg = args[i];
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64 if arg == nil then
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65 args[i] = "<nil>";
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66 else
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67 args[i] = tostring(arg);
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68 end
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69 formatstring = formatstring .. " [%s]"
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70 end
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71
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72 return formatstring:format(unpack(args));
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73 end
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74
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75 return {
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76 format = format;
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77 };