RexxS: RexxS moved page Module:/Parsedate to Module:Parsedate without leaving a redirect: accidental '/' char at start

2013-08-28T21:24:06Z

RexxS moved page Module:/Parsedate to Module:Parsedate without leaving a redirect: accidental '/' char at start

← Previous revision	Revision as of 21:24, 28 August 2013
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RexxS: create a module to parse dates to help date templates that could allow freeform entry

2013-08-28T21:22:05Z

create a module to parse dates to help date templates that could allow freeform entry

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-- Helper functions for [[Template:Start date]]
-- This will accept a start_date returning a string that:
-- for a valid date, wraps a hidden copy of the date in ISO format in a microformat
-- returns start_date
-- See Module:Age for other date functions

local p = {}

-- This parses a valid date string into a Lua date table and returns a hidden microformat
-- Only valid for dates after 31 A.D.

p.parse_date = function(frame)
local strdate = mw.text.trim(frame.args[1] or "")
local invalid = false
local wrd = {}
local num = {} -- this is a list of indices of wrd where the value is a number < 32
local yr = {} -- this is a list of indices of wrd where the value is a number > 31
local mth = {} -- this is a list of indices of wrd where the value is an alphabetical month

for w in string.gmatch(strdate, "%w+") do
-- catch numbers like '27th'
local found1, found2 = string.find(w, "%d+")
if found1 then w = string.sub(w, found1, found2) end
-- now we can store what we found
wrd[#wrd+1] = w
if tonumber(w) then
if tonumber(w) < 32 then num[#num+1] = #wrd else yr[#yr+1] = #wrd end
end
local s = string.sub(w, 1, 3) -- the first 3 chars of w
local f1 = string.find("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec", s, 1, true)
if f1 then
mth[#mth+1] = #wrd
wrd[#wrd] = (f1 + 3)/4 -- replace Jan with 1, Feb with 2, etc.
end
end

-- at this point #wrd contains the number of words and numbers and wrd contains the words and numbers
-- num is an index of day or numeric month candidates
-- yr is an index of year candidates
-- mth is an index of alphabetic month candidates

-- let's take out the garbage
if not yr[1] then invalid = true end -- no year
if not num[1] then invalid = true end -- no day
if not mth[1] then
-- no alpha month:
if not num[2] then
invalid = true -- no month
else
-- two numbers, but:
if not yr[1] then
invalid = true -- no year
else
-- two numbers and a year, but:
if yr[1] > num[1] then invalid = true end -- year is not first, so date not in yyyy--mm--dd format
end
end
end

local msg -- the output string
if invalid then
msg = strdate
else
-- if we have an alpha month, then it's either dmy or mdy. Otherwise it may be yyyy-mm-dd:
local ymddate
local dt = {}
if mth[1] then
-- str_date contains an alpha month, so dmy or mdy work the same now.
-- Put the first occurrence of each into the date table:
dt.year = wrd[yr[1]]
dt.month = wrd[mth[1]]
dt.day = wrd[num[1]]
else
-- yyyymmdd has to have numeric month before numeric day
dt.year = wrd[yr[1]]
dt.month = wrd[num[1]]
dt.day = wrd[num[2]]
end
ymddate = os.date("%Y-%m-%d", os.time(dt))
msg = '<span style="display:none"> (<span class="bday dtstart published updated">' .. ymddate .. '</span>)</span>' .. strdate
end
return msg
end

return p

Module:Parsedate - Revision history

RexxS: RexxS moved page Module:/Parsedate to Module:Parsedate without leaving a redirect: accidental '/' char at start

RexxS: create a module to parse dates to help date templates that could allow freeform entry