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util/format.lua @ 9080:1b21f8ffaec8
mod_pep: Silence warnings about unused arguments [luacheck]
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 03 Aug 2018 17:15:42 +0200 |
parent | 8417:e88db5668cfb |
child | 9656:3da6cc927ee6 |
rev | line source |
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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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util.format: A string.format wrapper that gracefully handles invalid arguments
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5 local tostring = tostring; |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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6 local select = select; |
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util.format: Import unpack from table lib in Lua 5.2+
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7 local unpack = table.unpack or unpack; -- luacheck: ignore 113/unpack |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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8 local type = type; |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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9 |
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util: Various minor changes to please [luacheck]
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10 local function format(formatstring, ...) |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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11 local args, args_length = { ... }, select('#', ...); |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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12 |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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13 -- format specifier spec: |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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14 -- 1. Start: '%%' |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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15 -- 2. Flags: '[%-%+ #0]' |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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16 -- 3. Width: '%d?%d?' |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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17 -- 4. Precision: '%.?%d?%d?' |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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18 -- 5. Option: '[cdiouxXaAeEfgGqs%%]' |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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19 -- |
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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. |
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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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parents:
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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 if arg == nil then -- special handling for nil |
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32 arg = "<nil>" |
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33 args[i] = "<nil>"; |
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34 end |
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35 |
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36 local option = spec:sub(-1); |
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37 if option == "q" or option == "s" then -- arg should be string |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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38 args[i] = tostring(arg); |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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39 elseif type(arg) ~= "number" then -- arg isn't number as expected? |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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parents:
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40 args[i] = tostring(arg); |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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41 spec = "[%s]"; |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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42 end |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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parents:
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43 end |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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44 return spec; |
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45 end); |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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46 |
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util.format: A string.format wrapper that gracefully handles invalid arguments
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47 -- process extra args |
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48 while i < args_length do |
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49 i = i + 1; |
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50 local arg = args[i]; |
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51 if arg == nil then |
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52 args[i] = "<nil>"; |
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53 else |
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54 args[i] = tostring(arg); |
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55 end |
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parents:
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56 formatstring = formatstring .. " [%s]" |
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57 end |
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58 |
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59 return formatstring:format(unpack(args)); |
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60 end |
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61 |
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62 return { |
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63 format = format; |
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64 }; |