prosody
8c92ef4270c9
util/format.lua

Find changesets by keywords by author, files, the commit message, revision number or hash, or revset expression.

Software / code / prosody

Annotate

util/format.lua @ 9687:8c92ef4270c9

util.format: Use pack from util.table
author Kim Alvefur <zash@zash.se>
date Sat, 08 Dec 2018 16:35:39 +0100
parent 9656:3da6cc927ee6
child 9693:6ed0d6224d64
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
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
1 --
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
2 -- A string.format wrapper that gracefully handles invalid arguments
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
3 --
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
4
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
5 local tostring = tostring;
8417
e88db5668cfb util.format: Import unpack from table lib in Lua 5.2+
Kim Alvefur <zash@zash.se>
parents: 8383
diff changeset
6 local unpack = table.unpack or unpack; -- luacheck: ignore 113/unpack
9687
8c92ef4270c9 util.format: Use pack from util.table
Kim Alvefur <zash@zash.se>
parents: 9656
diff changeset
7 local pack = require "util.table".pack; -- TODO table.pack in 5.2+
8225
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
8 local type = type;
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
9
8382
e5d00bf4a4d5 util: Various minor changes to please [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8225
diff changeset
10 local function format(formatstring, ...)
9687
8c92ef4270c9 util.format: Use pack from util.table
Kim Alvefur <zash@zash.se>
parents: 9656
diff changeset
11 local args = pack(...);
8c92ef4270c9 util.format: Use pack from util.table
Kim Alvefur <zash@zash.se>
parents: 9656
diff changeset
12 local args_length = args.n;
8225
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
13
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
14 -- format specifier spec:
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
15 -- 1. Start: '%%'
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
16 -- 2. Flags: '[%-%+ #0]'
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
17 -- 3. Width: '%d?%d?'
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
18 -- 4. Precision: '%.?%d?%d?'
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
19 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
20 --
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
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.
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
22 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
23 -- a and A are only in Lua 5.2+
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
24
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
25
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
26 -- process each format specifier
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
27 local i = 0;
8382
e5d00bf4a4d5 util: Various minor changes to please [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8225
diff changeset
28 formatstring = formatstring:gsub("%%[^cdiouxXaAeEfgGqs%%]*[cdiouxXaAeEfgGqs%%]", function(spec)
8225
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
29 if spec ~= "%%" then
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
30 i = i + 1;
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
31 local arg = args[i];
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
32
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
33 local option = spec:sub(-1);
9656
3da6cc927ee6 util.format: Tweak how nil values are handled
Kim Alvefur <zash@zash.se>
parents: 8417
diff changeset
34 if arg == nil then
3da6cc927ee6 util.format: Tweak how nil values are handled
Kim Alvefur <zash@zash.se>
parents: 8417
diff changeset
35 args[i] = "nil";
3da6cc927ee6 util.format: Tweak how nil values are handled
Kim Alvefur <zash@zash.se>
parents: 8417
diff changeset
36 spec = "<%s>";
3da6cc927ee6 util.format: Tweak how nil values are handled
Kim Alvefur <zash@zash.se>
parents: 8417
diff changeset
37 elseif option == "q" or option == "s" then -- arg should be string
8225
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
38 args[i] = tostring(arg);
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
39 elseif type(arg) ~= "number" then -- arg isn't number as expected?
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
40 args[i] = tostring(arg);
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
41 spec = "[%s]";
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
42 end
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
43 end
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
44 return spec;
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
45 end);
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
46
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
47 -- process extra args
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
48 while i < args_length do
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
49 i = i + 1;
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
50 local arg = args[i];
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
51 if arg == nil then
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
52 args[i] = "<nil>";
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
53 else
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
54 args[i] = tostring(arg);
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
55 end
8382
e5d00bf4a4d5 util: Various minor changes to please [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8225
diff changeset
56 formatstring = formatstring .. " [%s]"
8225
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
57 end
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
58
8382
e5d00bf4a4d5 util: Various minor changes to please [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8225
diff changeset
59 return formatstring:format(unpack(args));
8225
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
60 end
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
61
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
62 return {
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
63 format = format;
70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
64 };