imported>Artbarte at 19:42, 9 November 2018

2018-11-09T19:42:17Z

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-- Artbarte Google Code-in, Date formatting
-- WIP

local p = {}

-- Checks if string is a format and returns format string
-- Takes string | returns format string to be applied to os.date() OR nil
function parseFormat(str)
local formats = {mdy = "%B %d, %Y",year = "%Y",iso = "%Y-%m-%d",dmy = "%d %B %Y"}
formats["month and year"] = "%B %Y"

return formats[str]
end

-- Checks if string is a month or month abbreviation
-- Takes string | returns integer of month OR nil
function parseMonth(str)
str = string.lower(str)
local months = {{"January","jan"},
{"February","feb"},
{"March","mar"},
{"April","apr"},
{"May","may"},
{"June","jun"},
{"July","jul"},
{"August","aug"},
{"September","sep"},
{"October","oct"},
{"November","nov"},
{"December","dec"},
}

for i,v in ipairs(months) do
if str == string.lower(v[1]) or str == v[2] then
return i
end
end
return nil
end
-- Checks if the string includes on of the "circa words"
function checkIfCirca (str)
local dateString = str
local circa = false

local circaStrings = {"%(uncertain%)", "sometime ", "around "}
for i,v in ipairs(circaStrings) do
dateString, matches = string.gsub(dateString , v, "")
if matches >= 1 then
circa = true
end
end
return circa, dateString
end

p.parseDate = function (frame)
local date = frame.args.date or ""
local format = frame.args.format or ""

--
local circa = false
circa, date = checkIfCirca(date)

-- Pattern searches for 3 words sperated by spaces, slashes or dashes and puts them into variables: first, second, third
local first,second,third = string.match(date, "([%w%d]+)[ /-]([%w%d]+)[, /-] ?(%d+)")

-- If pattern didn't find any proper date format display error message
local fields = {}
if first ~= nil then table.insert(fields,first) else return "Invalid input <br>" end
if second ~= nil then table.insert(fields,second) end
if third ~= nil then table.insert(fields,third) end

-- Putting fields into proper value
local day,month,year
for i,v in ipairs(fields) do
local parsedMonth = parseMonth(v)
if parsedMonth ~= nil then
month = parsedMonth
elseif tonumber(v) > 31 then -- year only
year = v
elseif tonumber(v) > 12 then -- day only
day = v
elseif month == nil then
month = v
else
day = v
end
end

-- Preparing the return message
local returnMsg = date

-- If format is specified
parsedFormat = parseFormat(format)
if parsedFormat ~= nil then
local time = os.time({month=month,day=day,year=year})
returnMsg = os.date(parsedFormat, time)
end

if circa then
returnMsg = "circa " .. returnMsg
end
-- Return the message
return "Input: ".. date .. " Format: " .. format .. "<br>Output: '''" .. returnMsg .. "'''<br>"
end

return p

Module:Sandbox/Artbarte/Dates - Revision history

imported>Artbarte at 19:42, 9 November 2018