imported>N3rsti: Add comments

2020-01-18T14:41:51Z

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local p = {}

local date_words = {
months={"january", "february", "march", "april", "may", "june", "july", "august", "september", "october", "november", "december"},
short_months={"jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"},
accepted_endings = {"AD", "BCE", "BC", "CE"},
months_days = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
number_endings = {"st", "nd", "rd", "th"},
circa_words = {'circa', 'sometime', 'around', 'uncertain'},
accepted_words = {'year', 'month', 'day'}
}

-- Search for keywords
function check_valid(date_text, date_table)
local date_sign = "[^%s]+"
if string.match(date_text, "%-") then
date_sign = "[^%-]+"
elseif string.match(date_text, "%/") then
date_sign = "[^%/]+"
end
for word in string.gmatch(date_text, date_sign) do
table.insert(date_table, word)
end
for counter, month in pairs(date_words.months) do
for _, word in pairs(date_table) do
if string.lower(word) == month or string.lower(word) == date_words.short_months[counter] then
return {is_valid=true}
end
end
end
for _, ending in pairs(date_words.accepted_endings) do
for _, word in pairs(date_table) do
if word == ending then
return {is_valid=true}
end
end
end
for _, ending in pairs(date_words.circa_words) do
if string.match(date_text, ending) then
return {is_valid=true}
end
end
for _, word in pairs(date_words.accepted_words) do
if string.match(date_text, word) then
return {is_valid=true}
end
end

end

-- Define format from submitted date
function detect_date(date_text)
local date_sign = "[^%s]+"
local sign, date_ending = ""
local circa_ending = ""
if string.match(date_text, "%-") then
date_sign = "[^%-]+"
elseif string.match(date_text, "%/") then
date_sign = "[^%/]+"
end
local date_table = {}
for word in string.gmatch(date_text, date_sign) do
table.insert(date_table, word)
end
for _, ending in pairs(date_words.accepted_endings) do
for _, word in pairs(date_table) do
if word == ending then
date_ending = ending
end
end
end
for _, num_end in pairs(date_words.number_endings) do
for _, word in pairs(date_table) do
if string.sub(word, -#num_end) == num_end then
num_ending = num_end
end
end
end
for _, ending in pairs(date_words.circa_words) do
if string.match(date_text, ending) then
circa_ending = "circa"
end
end
date_ending = date_ending or ""
num_ending = num_ending or ""
if #date_table == 1 and tonumber(date_text) then
return {day=date_text}
end
if string.match(date_text, "%-") then
date_sign = "[^%-]+"
year, month, day = string.match(date_text, "(%d+)-(%d+)-(%d+)")
if year then
return {day=day, month=month, year=year, date_ending=date_ending, circa_ending=circa_ending}
end
elseif string.match(date_text, "%/") then
date_sign = "[^%/]+"
day, month, year = string.match(date_text, "(%d+)/(%d+)/(%d+)")
if day then
return {day=day, month=month, year=year, date_ending=date_ending, circa_ending=circa_ending}
end
end
if #date_table == 2 and tonumber(date_table[1]) and tonumber(date_table[2]) then
local day, year = string.match(date_text, "(%d+) (%d+)")
if day then
return {year=year, date_ending=date_ending, circa_ending=circa_ending}
end
end
if check_valid(date_text, date_table) then
local day, month, year = string.match(date_text, "(%d+)" .. num_ending .. " (%w+) (%d+)")
if day then
return {day=day, month=month, year=year, date_ending=date_ending, circa_ending=circa_ending}
else
local day, month, year = string.match(date_text, "(%d+) (%w+) (%d+)")
if day then
return {day=day, month=month, year=year, date_ending=date_ending, circa_ending=circa_ending}
end
month, day, year = string.match(date_text, "(%w+) (%d+), (%d+)") -- December 21, 2019
if day then
return {day=day, month=month, year=year, date_ending=date_ending, circa_ending=circa_ending}
end
for word in string.gmatch(date_text, date_sign) do
table.insert(date_table, word)
end
day=string.match(date_text, "(%d+)" .. num_ending)
_, year = string.match(date_text, "(.+) (%d+)")
if day and year then
for _, arr_month in pairs(date_words.months) do
month = arr_month
end
if month then
return {day=day, month=month, year=year, date_ending=date_ending, circa_ending=circa_ending}
end
end
day, month = string.match(date_text, "(%d+) (%d+)")
if day then
return {day=day, year=year, date_ending=date_ending, circa_ending=circa_ending}
end
day, month = string.match(date_text, "(%d+) (%w+)")
if day then
return {day=day, month=month, date_ending=date_ending, circa_ending=circa_ending}
end

end

end
if check_valid(date_text, date_table) then
year = string.match(date_text, "(%d+) (.+)")
if year then
return {year=year, circa_ending=circa_ending, date_ending=date_ending}
end
end

day, month = string.match(date_text, "(%d+) (%d+)")
if day then
return {day=day, month=month, year=year, date_ending=date_ending, circa_ending=circa_ending}
end
end

-- Format date to expected format
function p.format_date(frame)
local date_text = frame.args.date or ""
local date_format = frame.args.format or ""
local date_ending = ""
local day = ""
local month = ""
local year = ""
local circa_ending = ""
local date_ending = ""
if (string.match(date_text, "/") and date_format == "") or (string.match(date_text, "-") and date_format == "") then
date_format = "iso"
end
if detect_date(date_text) and detect_date(date_text).day then
day = detect_date(date_text).day or ""
end
if detect_date(date_text) and detect_date(date_text).month then
month = detect_date(date_text).month or ""
end
if detect_date(date_text) and detect_date(date_text).year then
year = detect_date(date_text).year or ""
end
if detect_date(date_text) and detect_date(date_text).date_ending then
date_ending = detect_date(date_text).date_ending or ""
end
if detect_date(date_text) and detect_date(date_text).circa_ending then
circa_ending = detect_date(date_text).circa_ending or ""
end
for month_num=1, #date_words.months do
if string.match(string.lower(date_text), date_words.months[month_num]) or string.match(string.lower(date_text), date_words.short_months[month_num]) then
month = date_words.months[month_num]
if tonumber(year) and tonumber(year) % 4 == 0 then
date_words.months_days[month_num] = date_words.months_days[month_num] + 1
end
if tonumber(day) > date_words.months_days[month_num] then
return "Invalid entry"
end
break
end
end
local index={}
for k,v in pairs(date_words.months) do
index[v]=k
end
month = month:gsub("^%l", string.upper)
if date_format == "iso" then
if not tonumber(month) then
month = tostring(index[string.lower(month)])
if #month == 1 then
month = "0" .. month
end
if #day == 1 then
day = "0" .. day
end
end
return circa_ending .. " " .. year .. "-" .. month .. "-" .. day .. " " .. date_ending
elseif date_format == "mdy" then
if tonumber(month) then
month = date_words.months[tonumber(month)] or ""
month = month:gsub("^%l", string.upper) or ""
end
return circa_ending .. " " .. month .. " " .. day .. ", " .. year .. " " .. date_ending
elseif date_format == "year" then
return circa_ending .. " " .. year .. " " .. date_ending
end
if day == "" and month == "" and year == "" then
return "Invalid entry"
end
if tonumber(month) then
month = date_words.months[tonumber(month)] or ""
month = month:gsub("^%l", string.upper) or ""
end
if month == date_ending then
month = ""
end
if year == date_ending then
year = ""
end
return circa_ending .. " " .. day .. " " .. month .. " " .. year .. " " .. date_ending
end

return p

Module:Sandbox/N3rsti/Dates2 - Revision history

imported>N3rsti: Add comments