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examples/date_arithmetic.lua: Remove unused c2 var
[etc/awesome.git] / luatz / parse.lua
1 local new_timetable = require "luatz.timetable".new
2
3 --- Parse an RFC 3339 datetime at the given position
4 -- Returns a time table and the `tz_offset`
5 -- Return value is not normalised (this preserves a leap second)
6 -- If the timestamp is only partial (i.e. missing "Z" or time offset) then `tz_offset` will be nil
7 -- TODO: Validate components are within their boundarys (e.g. 1 <= month <= 12)
8 local function rfc_3339 ( str , init )
9         local year , month , day , hour , min , sec , patt_end = str:match ( "^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)()" , init ) -- luacheck: ignore 631
10         if not year then
11                 return nil, "Invalid RFC 3339 timestamp"
12         end
13         year  = tonumber ( year )
14         month = tonumber ( month )
15         day   = tonumber ( day )
16         hour  = tonumber ( hour )
17         min   = tonumber ( min )
18         sec   = tonumber ( sec )
19
20         local tt = new_timetable ( year , month , day , hour , min , sec )
21
22         local tz_offset
23         if str:match ("^[Zz]" , patt_end ) then
24                 tz_offset = 0
25         else
26                 local hour_offset , min_offset = str:match ( "^([+-]%d%d):(%d%d)" , patt_end )
27                 if hour_offset then
28                         tz_offset = tonumber ( hour_offset ) * 3600 + tonumber ( min_offset ) * 60
29                 else -- luacheck: ignore 542
30                         -- Invalid RFC 3339 timestamp offset (should be Z or (+/-)hour:min)
31                         -- tz_offset will be nil
32                 end
33         end
34
35         return tt , tz_offset
36 end
37
38 return {
39         rfc_3339 = rfc_3339 ;
40 }