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util/format.lua @ 8494:4f75f4da6d4e
certmanager: Check for missing certificate before key in configuration (should be marginally less confusing)
author | Kim Alvefur <zash@zash.se> |
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date | Thu, 28 Dec 2017 17:32:56 +0100 |
parent | 8225:70cb72f46a3b |
child | 8382:e5d00bf4a4d5 |
rev | line source |
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8225
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util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
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1 -- |
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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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util.format: A string.format wrapper that gracefully handles invalid arguments
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parents:
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3 -- |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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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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util.format: A string.format wrapper that gracefully handles invalid arguments
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10 |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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11 local function format(format, ...) |
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12 local args, args_length = { ... }, select('#', ...); |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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13 |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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14 -- format specifier spec: |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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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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util.format: A string.format wrapper that gracefully handles invalid arguments
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18 -- 4. Precision: '%.?%d?%d?' |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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19 -- 5. Option: '[cdiouxXaAeEfgGqs%%]' |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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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 }; |